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Li C, Wei Y, Li Y, Luo Z, Liu Y, He M, Zhang Y, He X, Chang X, Quan Z. Manipulating Chiroptical Activities in 0D Chiral Hybrid Manganese Bromides by Solvent Molecular Engineering. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2400338. [PMID: 38766952 DOI: 10.1002/smll.202400338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2024] [Revised: 04/23/2024] [Indexed: 05/22/2024]
Abstract
0D hybrid metal halides (0D HMHs) with fully isolated inorganic units provide an ideal platform for studying the correlations between chiroptical activities and crystal structures at atomic levels. Here, through the incorporation of different solvent molecules, a series of 0D chiral manganese bromides (RR/SS-C20H28N2)3MnBr8·2X (X = C2H5OH, CH3OH, or H2O) are synthesized to elucidate their chiroptical properties. They show negligible circular dichroism signals of Mn absorptions due to C2v-symmetric [MnBr4]2- tetrahedra. However, they display distinct circularly polarized luminescence (CPL) signals with continuously increased luminescence asymmetry factors (glum) from 10-4 (X = C2H5OH) to 10-3 (X = H2O). The increased glum value is structurally revealed to originate from the enhancement of [MnBr4]2- tetrahedral bond-angle distortions, due to the presence of different solvent molecules. Furthermore, (RR/SS-C20H28N2)MnBr4·H2O enantiomers with larger bond-angle distortions of [MnBr4]2- tetrahedra are synthesized based on hydrobromic acid-induced structural transformation of (RR/SS-C20H28N2)3MnBr8·2H2O enantiomers. Therefore, such (RR/SS-C20H28N2)MnBr4·H2O enantiomers exhibit enhanced CPL signals with |glum| up to 1.23 × 10-2. This work provides unique insight into enhancing chiroptical activities in 0D HMH systems.
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Affiliation(s)
- Chen Li
- Department of Chemistry and Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, China
| | - Yi Wei
- Department of Chemistry and Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, China
| | - Yawen Li
- Department of Chemistry and Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, China
| | - Zhishan Luo
- Department of Chemistry and Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, China
| | - Yulian Liu
- Department of Chemistry and Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, China
| | - Meiying He
- Department of Chemistry and Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, China
| | - Yan Zhang
- Department of Chemistry and Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, China
| | - Xin He
- Department of Chemistry and Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, China
| | - Xiaoyong Chang
- Department of Chemistry and Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, China
| | - Zewei Quan
- Department of Chemistry and Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, China
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Sun Y, Xu Z, Wang Y, Niu Z, Xu Z, Li S, Wang W, Liu Y. Enhanced performance of thermally activated delayed fluorescent light emitting diodes by optimized host polarity. OPTICS EXPRESS 2024; 32:17942-17952. [PMID: 38858962 DOI: 10.1364/oe.522090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2024] [Accepted: 04/17/2024] [Indexed: 06/12/2024]
Abstract
The interaction between the intrinsic polarity of the host material and the TADF guest material affects charge injection and transport, exciton formation, charge recombination, and emission mechanisms. Therefore, understanding and controlling the interaction between the intrinsic polarity of the host material and the TADF guest material is very important to realize efficient TADF-OLED devices. This study investigated the molecular interaction between different polar host materials and a thermally activated delayed fluorescence material (DMAc-PPM). It has been found that interaction between the host and guest (π-π stacking interaction, multiple CH/π contacts) greatly influence the molecular transition dipole moment orientation of the guest. And the OLED devices based on the strong polar host (DPEPO) exhibited the highest EQEmax and lowest luminescence intensity, while devices using the weaker polar hosts mCP and CBP achieved higher luminance and lower EQEmax. Then, the strong polar host DPEPO was mixed with the weaker polar hosts CBP and mCP, respectively. The devices prepared based on the mixed-host DPEPO: mCP showed a 2.2 times improvement in EQEmax from 6.3% to 20.1% compared to the single-host mCP. The devices prepared based on the mixed-host DPEPO: CBP showed a 3.1 times improvement in luminance intensity from 1023 cd/m2 to 4236 cd/m2 compared to the single host of DPEPO. This suggests that optimizing the polarity of host materials has the potential to enhance the performance of solution prepared OLED devices.
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Knysh I, Villalobos-Castro JDJ, Duchemin I, Blase X, Jacquemin D. Excess and excited-state dipole moments of real-life dyes: a comparison between wave-function, BSE/ GW, and TD-DFT values. Phys Chem Chem Phys 2023; 25:29993-30004. [PMID: 37905396 DOI: 10.1039/d3cp04467j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2023]
Abstract
In this work, we assess the accuracy of the Bethe-Salpeter equation (BSE) many-body Green's function formalism, adopting the eigenvalue-self-consistent evGW exchange-correlation kernel, for the calculation of the excited-state (μES) and excess dipole moments (Δμ), the latter ones being the changes of dipole amplitude between the ground and excited states (ES), in organic dyes. We compare the results obtained with wave-function methods [ADC(2), CC2, and CCSD], time-dependent density functional theory (TD-DFT), and BSE/evGW levels of theory. First, we compute the evolution of the dipole moments of the two lowest singlet excited states of 4-(dimethylamino)benzonitrile (DMABN) upon twisting of the amino group. Next, we use a set of 25 dyes having ES characters ranging from locally excited to charge transfer to determine both μES and Δμ. For DMABN our results show that BSE/evGW provides Δμ values closer to the CCSD reference and more consistent trends than TD-DFT. Moreover, a statistical analysis of both Δμ and μES for the set of 25 dyes shows that the BSE/evGW accuracy is comparable or sometimes slightly better than that of TD-M06-2X and TD-CAM-B3LYP, BSE/evGW outperforming TD-DFT in challenging cases (zwitterionic and cyanine transitions). Finally, the starting point dependency of BSE/evGW seems to be larger for Δμ, ES dipoles, and oscillator strengths than for transition energies.
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Affiliation(s)
- Iryna Knysh
- Nantes Université, CNRS, CEISAM UMR 6230, F-44000 Nantes, France.
| | | | - Ivan Duchemin
- Université Grenoble Alpes, CEA, IRIG-MEM-L_Sim, 38054 Grenoble, France
| | - Xavier Blase
- Université Grenoble Alpes, CNRS, Institut Néel, F-38042 Grenoble, France.
| | - Denis Jacquemin
- Nantes Université, CNRS, CEISAM UMR 6230, F-44000 Nantes, France.
- Institut Universitaire de France, F-75005 Paris, France
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Yang Z, Xu T, Li H, She M, Chen J, Wang Z, Zhang S, Li J. Zero-Dimensional Carbon Nanomaterials for Fluorescent Sensing and Imaging. Chem Rev 2023; 123:11047-11136. [PMID: 37677071 DOI: 10.1021/acs.chemrev.3c00186] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/09/2023]
Abstract
Advances in nanotechnology and nanomaterials have attracted considerable interest and play key roles in scientific innovations in diverse fields. In particular, increased attention has been focused on carbon-based nanomaterials exhibiting diverse extended structures and unique properties. Among these materials, zero-dimensional structures, including fullerenes, carbon nano-onions, carbon nanodiamonds, and carbon dots, possess excellent bioaffinities and superior fluorescence properties that make these structures suitable for application to environmental and biological sensing, imaging, and therapeutics. This review provides a systematic overview of the classification and structural properties, design principles and preparation methods, and optical properties and sensing applications of zero-dimensional carbon nanomaterials. Recent interesting breakthroughs in the sensitive and selective sensing and imaging of heavy metal pollutants, hazardous substances, and bioactive molecules as well as applications in information encryption, super-resolution and photoacoustic imaging, and phototherapy and nanomedicine delivery are the main focus of this review. Finally, future challenges and prospects of these materials are highlighted and envisaged. This review presents a comprehensive basis and directions for designing, developing, and applying fascinating fluorescent sensors fabricated based on zero-dimensional carbon nanomaterials for specific requirements in numerous research fields.
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Affiliation(s)
- Zheng Yang
- Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education, College of Chemistry & Materials Science, Northwest University, Xi'an 710127, P. R. China
- College of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an 710054, P. R. China
| | - Tiantian Xu
- College of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an 710054, P. R. China
| | - Hui Li
- Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education, College of Chemistry & Materials Science, Northwest University, Xi'an 710127, P. R. China
- College of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an 710054, P. R. China
| | - Mengyao She
- Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education, College of Chemistry & Materials Science, Northwest University, Xi'an 710127, P. R. China
- Ministry of Education Key Laboratory of Resource Biology and Modern Biotechnology in Western China, Provincial Key Laboratory of Biotechnology of Shaanxi, The College of Life Sciences, Northwest University, Xi'an 710069, P. R. China
| | - Jiao Chen
- Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education, College of Chemistry & Materials Science, Northwest University, Xi'an 710127, P. R. China
- Ministry of Education Key Laboratory of Resource Biology and Modern Biotechnology in Western China, Provincial Key Laboratory of Biotechnology of Shaanxi, The College of Life Sciences, Northwest University, Xi'an 710069, P. R. China
| | - Zhaohui Wang
- Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education, College of Chemistry & Materials Science, Northwest University, Xi'an 710127, P. R. China
| | - Shengyong Zhang
- Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education, College of Chemistry & Materials Science, Northwest University, Xi'an 710127, P. R. China
| | - Jianli Li
- Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education, College of Chemistry & Materials Science, Northwest University, Xi'an 710127, P. R. China
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Liu Q, Deng Y, Ren B, Lan X, Zhang Y, Guo R, Li C, Xiong G, Sun Y, Zhao Z. Unraveling the Position Effect of Spiroxanthene-Based n-Type Hosts for High-Performance TADF-OLEDs. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:2517. [PMID: 37764546 PMCID: PMC10537283 DOI: 10.3390/nano13182517] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Revised: 09/04/2023] [Accepted: 09/06/2023] [Indexed: 09/29/2023]
Abstract
For developing high-performance organic light-emitting diodes (OLEDs) with thermally activated delayed fluorescent (TADF) emitters, the diphenyltriazine (TRZ) unit was introduced onto the 2'- and 3'-positions of xanthene moiety of spiro[fluorene-9,9'-xanthene] (SFX) to construct n-type host molecules, namely 2'-TRZSFX and 3'-TRZSFX. The outward extension of the TRZ unit, induced by the meta-linkage, resulted in a higher planarity between the TRZ unit and xanthene moiety in the corresponding 3'-TRZSFX. Additionally, this extension led to a perched T1 level, as well as a lower unoccupied molecular orbital (LUMO) level when compared with 2'-TRZSFX. Meanwhile, the 3'-TRZSFX molecules in the crystalline state presented coherent packing along with the interaction between TRZ units; the similar packing motif was spaced apart from xanthene moieties in the 2'-TRZSFX crystal. These endowed 3'-TRZSFX superior electron transport capacity in single-carrier devices relative to the 2'-TRZSFX-based device. Hence, the 3'-TRZSFX-based TADF-OLED showed remarkable electroluminescent (EL) performance under the operating luminance from turn-on to ca. 1000 cd·m-2 with a maximum external quantum efficiency (EQEmax) of 23.0%, thanks to its matched LUMO level with 4CzIPN emitter and better electron transport capacity. Interestingly, the 2'-TRZSFX-based device, with an EQEmax of 18.8%, possessed relatively low roll-off and higher efficiency when the operating luminance exceeded 1000 cd·m-2, which was attributed to the more balanced carrier transport under high operating voltage. These results were elucidated by the analysis of single-crystal structures and the measurements of single-carrier devices, combined with EL performance. The revealed position effect of the TRZ unit on xanthene moiety provides a more informed strategy to develop SFX-based hosts for highly efficient TADF-OLEDs.
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Affiliation(s)
- Qinglin Liu
- College of Science, Key Laboratory of Inorganic Molecule-Based Chemistry of Liaoning Province, Shenyang University of Chemical Technology, Shenyang 110142, China; (Q.L.); (X.L.); (Y.Z.); (C.L.); (G.X.); (Y.S.)
| | - Yun Deng
- Frontiers Science Center for Flexible Electronics, Xi’an Institute of Flexible Electronics and Xi’an Institute of Biomedical Materials & Engineering, Northwestern Polytechnical University, Xi’an 710072, China;
| | - Baoyi Ren
- College of Science, Key Laboratory of Inorganic Molecule-Based Chemistry of Liaoning Province, Shenyang University of Chemical Technology, Shenyang 110142, China; (Q.L.); (X.L.); (Y.Z.); (C.L.); (G.X.); (Y.S.)
| | - Xia Lan
- College of Science, Key Laboratory of Inorganic Molecule-Based Chemistry of Liaoning Province, Shenyang University of Chemical Technology, Shenyang 110142, China; (Q.L.); (X.L.); (Y.Z.); (C.L.); (G.X.); (Y.S.)
| | - Yuehong Zhang
- College of Science, Key Laboratory of Inorganic Molecule-Based Chemistry of Liaoning Province, Shenyang University of Chemical Technology, Shenyang 110142, China; (Q.L.); (X.L.); (Y.Z.); (C.L.); (G.X.); (Y.S.)
| | - Runda Guo
- Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
- State Key Laboratory of Luminescent Materials and Devices, Key Laboratory of Luminescence from Molecular Aggregates of Guangdong Province, South China University of Technology, Guangzhou 510640, China;
| | - Chensheng Li
- College of Science, Key Laboratory of Inorganic Molecule-Based Chemistry of Liaoning Province, Shenyang University of Chemical Technology, Shenyang 110142, China; (Q.L.); (X.L.); (Y.Z.); (C.L.); (G.X.); (Y.S.)
| | - Gang Xiong
- College of Science, Key Laboratory of Inorganic Molecule-Based Chemistry of Liaoning Province, Shenyang University of Chemical Technology, Shenyang 110142, China; (Q.L.); (X.L.); (Y.Z.); (C.L.); (G.X.); (Y.S.)
| | - Yaguang Sun
- College of Science, Key Laboratory of Inorganic Molecule-Based Chemistry of Liaoning Province, Shenyang University of Chemical Technology, Shenyang 110142, China; (Q.L.); (X.L.); (Y.Z.); (C.L.); (G.X.); (Y.S.)
| | - Zujin Zhao
- State Key Laboratory of Luminescent Materials and Devices, Key Laboratory of Luminescence from Molecular Aggregates of Guangdong Province, South China University of Technology, Guangzhou 510640, China;
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6
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Liu H, Fu Y, Chen J, Tang BZ, Zhao Z. Energy-Efficient Stable Hyperfluorescence Organic Light-Emitting Diodes with Improved Color Purities and Ultrahigh Power Efficiencies Based on Low-Polar Sensitizing Systems. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2212237. [PMID: 36893769 DOI: 10.1002/adma.202212237] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Revised: 03/03/2023] [Indexed: 06/02/2023]
Abstract
Multi-resonance (MR) molecules with thermally activated delayed fluorescence (TADF) are emerging as promising candidates for high-definition displays because of their narrow emission spectra. However, the electroluminescence (EL) efficiencies and spectra of MR-TADF molecules are highly sensitive to hosts and sensitizers when applied to organic light-emitting diodes (OLEDs), and the highly polar environments in devices often lead to significantly broadened EL spectra. In this study, a proof-of-concept TADF sensitizer (BTDMAC-XT) with low polarity, high steric hindrance, and concentration-quenching free feature is constructed, which acts as a good emitter in doped and non-doped OLEDs with high external quantum efficiencies (ηext s) of 26.7% and 29.3%, respectively. By combining BTDMAC-XT with conventional low-polarity hosts, low-polarity sensitizing systems with a small carrier injection barrier and full exciton utilization are constructed for the MR-TADF molecule BN2. Hyperfluorescence (HF) OLEDs employing the low-polar sensitizing systems successfully improve the color quality of BN2 and afford an excellent ηext of 34.4%, a record-high power efficiency of 166.3 lm W-1 and a long operational lifetime (LT50 = 40309 h) at an initial luminance of 100 cd m-2 . These results provide instructive guidance for the sensitizer design and device optimization for energy-efficient and stable HF-OLEDs with high-quality light.
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Affiliation(s)
- Hao Liu
- State Key Laboratory of Luminescent Materials and Devices, Key Laboratory of Luminescence from Molecular Aggregates of Guangdong Province, South China University of Technology, Guangzhou, 510640, China
| | - Yan Fu
- State Key Laboratory of Luminescent Materials and Devices, Key Laboratory of Luminescence from Molecular Aggregates of Guangdong Province, South China University of Technology, Guangzhou, 510640, China
| | - Jinke Chen
- State Key Laboratory of Luminescent Materials and Devices, Key Laboratory of Luminescence from Molecular Aggregates of Guangdong Province, South China University of Technology, Guangzhou, 510640, China
| | - Ben Zhong Tang
- School of Science and Engineering, Shenzhen Institute of Aggregate Science and Technology, The Chinese University of Hong Kong, Shenzhen, Guangdong, 518172, China
| | - Zujin Zhao
- State Key Laboratory of Luminescent Materials and Devices, Key Laboratory of Luminescence from Molecular Aggregates of Guangdong Province, South China University of Technology, Guangzhou, 510640, China
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7
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Gillett AJ, Pershin A, Pandya R, Feldmann S, Sneyd AJ, Alvertis AM, Evans EW, Thomas TH, Cui LS, Drummond BH, Scholes GD, Olivier Y, Rao A, Friend RH, Beljonne D. Dielectric control of reverse intersystem crossing in thermally activated delayed fluorescence emitters. NATURE MATERIALS 2022; 21:1150-1157. [PMID: 35927434 PMCID: PMC7613666 DOI: 10.1038/s41563-022-01321-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Accepted: 06/13/2022] [Indexed: 05/22/2023]
Abstract
Thermally activated delayed fluorescence enables organic semiconductors with charge transfer-type excitons to convert dark triplet states into bright singlets via reverse intersystem crossing. However, thus far, the contribution from the dielectric environment has received insufficient attention. Here we study the role of the dielectric environment in a range of thermally activated delayed fluorescence materials with varying changes in dipole moment upon optical excitation. In dipolar emitters, we observe how environmental reorganization after excitation triggers the full charge transfer exciton formation, minimizing the singlet-triplet energy gap, with the emergence of two (reactant-inactive) modes acting as a vibrational fingerprint of the charge transfer product. In contrast, the dielectric environment plays a smaller role in less dipolar materials. The analysis of energy-time trajectories and their free-energy functions reveals that the dielectric environment substantially reduces the activation energy for reverse intersystem crossing in dipolar thermally activated delayed fluorescence emitters, increasing the reverse intersystem crossing rate by three orders of magnitude versus the isolated molecule.
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Affiliation(s)
| | - Anton Pershin
- Laboratory for Chemistry of Novel Materials, Université de Mons, Mons, Belgium
- Wigner Research Centre for Physics, Budapest, Hungary
| | - Raj Pandya
- Cavendish Laboratory, University of Cambridge, Cambridge, UK
| | - Sascha Feldmann
- Cavendish Laboratory, University of Cambridge, Cambridge, UK
| | | | | | - Emrys W Evans
- Cavendish Laboratory, University of Cambridge, Cambridge, UK
- Department of Chemistry, Swansea University, Swansea, UK
| | - Tudor H Thomas
- Cavendish Laboratory, University of Cambridge, Cambridge, UK
| | - Lin-Song Cui
- CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, China
| | | | | | - Yoann Olivier
- Unité de Chimie Physique Théorique et Structurale & Laboratoire de Physique du Solide, Namur Institute of Structured Matter, Université de Namur, Namur, Belgium
| | - Akshay Rao
- Cavendish Laboratory, University of Cambridge, Cambridge, UK
| | | | - David Beljonne
- Laboratory for Chemistry of Novel Materials, Université de Mons, Mons, Belgium.
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8
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Effect of host polarity on efficiency of thermally activated delayed fluorescent and hyperfluorescent organic light emitting devices. J IND ENG CHEM 2022. [DOI: 10.1016/j.jiec.2022.09.049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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9
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Wei J, Yang Y, Liu X, Li R, Li S. 2,3‐Disubstituted Fluorene Scaffold for Efficient Green Phosphorescent Organic Light‐Emitting Diodes. Chemistry 2022; 28:e202200756. [DOI: 10.1002/chem.202200756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Indexed: 11/09/2022]
Affiliation(s)
- Jia‐Jia Wei
- School of Environment and Chemical Engineering Jiangsu Ocean University 59 Cangwu Road, Haizhou District Lianyungang 222005 P. R. China
| | - Yong‐Jian Yang
- School of Environment and Chemical Engineering Jiangsu Ocean University 59 Cangwu Road, Haizhou District Lianyungang 222005 P. R. China
| | - Xiang‐Yang Liu
- WISPO Advanced Materials (Suzhou) Co., Ltd. 200 Xingpu Road, Shengpu Street, Suzhou Industrial Park (SIP) Suzhou 215126 P. R. China
| | - Runlai Li
- College of Polymer Science & Engineering State Key Laboratory of Polymer Materials Engineering Sichuan University Chengdu 610065 P. R. China
| | - Shu‐an Li
- School of Environment and Chemical Engineering Jiangsu Ocean University 59 Cangwu Road, Haizhou District Lianyungang 222005 P. R. China
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Chen JX, Wang H, Xiao YF, Wang K, Zheng MH, Chen WC, Zhou L, Hu D, Huo Y, Lee CS, Zhang XH. Optimizing Intermolecular Interactions and Energy Level Alignments of Red TADF Emitters for High-Performance Organic Light-Emitting Diodes. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2201548. [PMID: 35491513 DOI: 10.1002/smll.202201548] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Revised: 04/06/2022] [Indexed: 06/14/2023]
Abstract
Adequately harvesting all excitons in a single molecule and inhibiting exciton losses caused by intermolecular interactions are two important factors for achieving high efficiencies thermally activated delayed fluorescence (TADF). One potential approach for optimizing these is to tune alignment of various excited state energy levels by using different doping concentrations. Unfortunately, emission efficiencies of most TADF emitters decrease rapidly with concentrations which limits the window for energy level tunning. In this work, by introducing a spiro group to increase steric hindrance of a TADF emitter (BPPXZ) with a phenoxazine and a dibenzo[a,c]phenazine, emission efficiency of the resulting molecule (BPSPXZ) is much less affected by concentration increase. This enables exploitation of the concentration effects to tune energy levels of its excited states for obtaining simultaneously small singlet-triplet energy offset and large spin-orbital coupling, leading to high-efficiency reverse intersystem crossing. With these merits, organic light-emitting diodes (OLEDs) using the BPSPXZ emitter from 5 to 60 wt% doping can all deliver EQE of over 20%. More importantly, record-high EQEs of 33.4% and 15.8% are respectively achieved in the optimized and nondoped conditions. This work proposes a strategy for developing red TADF emitters by optimizing the intermolecular interaction and energy level alignments to facilitate exciton utilization over wide doping concentrations.
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Affiliation(s)
- Jia-Xiong Chen
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, P. R. China
| | - Hui Wang
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Collaborative Innovation Center of Suzhou Nano Science & Technology, Soochow University, Suzhou, 215123, P. R. China
| | - Ya-Fang Xiao
- Center of Super-Diamond and Advanced Films (COSDAF) and Department of Chemistry, City University of Hong Kong, Hong Kong SAR, P. R. China
| | - Kai Wang
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Collaborative Innovation Center of Suzhou Nano Science & Technology, Soochow University, Suzhou, 215123, P. R. China
| | - Ming-Hui Zheng
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, P. R. China
| | - Wen-Cheng Chen
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, P. R. China
| | - Lu Zhou
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Collaborative Innovation Center of Suzhou Nano Science & Technology, Soochow University, Suzhou, 215123, P. R. China
| | - Dehua Hu
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, P. R. China
| | - Yanping Huo
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, P. R. China
| | - Chun-Sing Lee
- Center of Super-Diamond and Advanced Films (COSDAF) and Department of Chemistry, City University of Hong Kong, Hong Kong SAR, P. R. China
| | - Xiao-Hong Zhang
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Collaborative Innovation Center of Suzhou Nano Science & Technology, Soochow University, Suzhou, 215123, P. R. China
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Tan HJ, Yang GX, Deng YL, Cao C, Tan JH, Zhu ZL, Chen WC, Xiong Y, Jian JX, Lee CS, Tong QX. Deep-Blue OLEDs with Rec.2020 Blue Gamut Compliance and EQE Over 22% Achieved by Conformation Engineering. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2200537. [PMID: 35236007 DOI: 10.1002/adma.202200537] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Revised: 02/28/2022] [Indexed: 06/14/2023]
Abstract
To achieve high-efficiency deep-blue electroluminescence satisfying Rec.2020 standard blue gamut, two thermally activated delayed fluorescent (TADF) emitters are developed: 5-(2,12-di-tert-butyl-5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracen-7-yl)-10,10-diphenyl-5,10-dihydrodibenzo[b,e][1,4]azasiline (TDBA-PAS) and 10-(2,12-di-tert-butyl-5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracen-7-yl)-9,9-diphenyl-9,10-dihydroacridine (TDBA-DPAC). Inheriting from their parented organoboron multi-resonance core, both emitters show very promising deep-blue emissions with relatively narrow full width at half-maximum (FWHM, ≈50 nm in solution), high photoluminescence quantum yield (up to 92.3%), and short emission lifetime (≤2.49 µs) with fast reverse intersystem crossing (>106 s-1 ) in doped films. More importantly, replacing the spiro-centered sp3 C atom (TDBA-DPAC) with the larger-radius sp3 Si atom (TDBA-PAS), enhanced conformational heterogeneities in bulky-group-shielded TADF molecules are observed in solution, doped film, and device. Consequently, OLEDs based on TDBA-PAS retain high maximum external quantum efficiencies ≈20% with suppressed efficiency roll-off and color index close to Rec.2020 blue gamut over a wide doping range of 10-50 wt%. This study highlights a new strategy to restrain spectral broadening and redshifting and efficiency roll-off in the design of deep-blue TADF emitters.
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Affiliation(s)
- Hong-Ji Tan
- Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Material of Guangdong Province, Shantou University, Guangdong, 515063, P. R. China
| | - Guo-Xi Yang
- Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Material of Guangdong Province, Shantou University, Guangdong, 515063, P. R. China
| | - Ying-Lan Deng
- Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Material of Guangdong Province, Shantou University, Guangdong, 515063, P. R. China
| | - Chen Cao
- Center of Super-Diamond and Advanced Films (COSDAF) and Department of Chemistry, City University of Hong Kong, Hong Kong, SAR, China
| | - Ji-Hua Tan
- Center of Super-Diamond and Advanced Films (COSDAF) and Department of Chemistry, City University of Hong Kong, Hong Kong, SAR, China
| | - Ze-Lin Zhu
- Center of Super-Diamond and Advanced Films (COSDAF) and Department of Chemistry, City University of Hong Kong, Hong Kong, SAR, China
| | - Wen-Cheng Chen
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, China
| | - Yuan Xiong
- Center of Super-Diamond and Advanced Films (COSDAF) and Department of Chemistry, City University of Hong Kong, Hong Kong, SAR, China
| | - Jing-Xin Jian
- Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Material of Guangdong Province, Shantou University, Guangdong, 515063, P. R. China
| | - Chun-Sing Lee
- Center of Super-Diamond and Advanced Films (COSDAF) and Department of Chemistry, City University of Hong Kong, Hong Kong, SAR, China
| | - Qing-Xiao Tong
- Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Material of Guangdong Province, Shantou University, Guangdong, 515063, P. R. China
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12
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Bian J, Chen S, Qiu L, Tian R, Man Y, Wang Y, Chen S, Zhang J, Duan C, Han C, Xu H. Ambipolar Self-Host Functionalization Accelerates Blue Multi-Resonance Thermally Activated Delayed Fluorescence with Internal Quantum Efficiency of 100. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2110547. [PMID: 35233858 DOI: 10.1002/adma.202110547] [Citation(s) in RCA: 38] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2021] [Revised: 02/22/2022] [Indexed: 06/14/2023]
Abstract
Emerging multi-resonance (MR) thermally activated delayed fluorescence (TADF) emitters can combine 100% exciton harvesting and high color purity for their organic light-emitting diodes (OLED). However, the highly planar configurations of MR molecules lead to intermolecular-interaction-induced quenching. A feasible way is integrating host segments into MR molecules, namely a "self-host" strategy, but without involving additional charge transfer and/or vibrational components to excited states. Herein, an ambipolar self-host featured MR emitter, tCBNDADPO, is demonstrated, whose ambipolar host segment (DADPO) significantly and comprehensively improves the TADF properties, especially greatly accelerated singlet radiative rate constant of 2.11 × 108 s-1 and exponentially reduced nonradiative rate constants. Consequently, at the same time as preserving narrowband blue emission with an FWHM of ≈28 nm at a high doping concentration of 30%, tCBNDADPO reveals state-of-the-art photoluminescence and electroluminescence quantum efficiencies of 99% and 30%, respectively. The corresponding 100% internal quantum efficiency of tCBNDADPO supported by an ultrasimple trilayer and heavily doped device demonstrates the feasibility of the ambipolar self-host strategy for constructing practically applicable MR materials.
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Affiliation(s)
- Jinkun Bian
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education & School of Chemistry and Material Science, Heilongjiang University, 74 Xuefu Road, Harbin, 150080, P. R. China
| | - Su Chen
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education & School of Chemistry and Material Science, Heilongjiang University, 74 Xuefu Road, Harbin, 150080, P. R. China
| | - Lili Qiu
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education & School of Chemistry and Material Science, Heilongjiang University, 74 Xuefu Road, Harbin, 150080, P. R. China
| | - Rundong Tian
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education & School of Chemistry and Material Science, Heilongjiang University, 74 Xuefu Road, Harbin, 150080, P. R. China
| | - Yi Man
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education & School of Chemistry and Material Science, Heilongjiang University, 74 Xuefu Road, Harbin, 150080, P. R. China
| | - Yidan Wang
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education & School of Chemistry and Material Science, Heilongjiang University, 74 Xuefu Road, Harbin, 150080, P. R. China
| | - Shuo Chen
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education & School of Chemistry and Material Science, Heilongjiang University, 74 Xuefu Road, Harbin, 150080, P. R. China
| | - Jing Zhang
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education & School of Chemistry and Material Science, Heilongjiang University, 74 Xuefu Road, Harbin, 150080, P. R. China
| | - Chunbo Duan
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education & School of Chemistry and Material Science, Heilongjiang University, 74 Xuefu Road, Harbin, 150080, P. R. China
| | - Chunmiao Han
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education & School of Chemistry and Material Science, Heilongjiang University, 74 Xuefu Road, Harbin, 150080, P. R. China
| | - Hui Xu
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education & School of Chemistry and Material Science, Heilongjiang University, 74 Xuefu Road, Harbin, 150080, P. R. China
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13
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Tao Y, Liu C, Xiang Y, Wang Z, Xue X, Li P, Li H, Xie G, Huang W, Chen R. Resonance-Induced Stimuli-Responsive Capacity Modulation of Organic Ultralong Room Temperature Phosphorescence. J Am Chem Soc 2022; 144:6946-6953. [PMID: 35316606 DOI: 10.1021/jacs.2c01669] [Citation(s) in RCA: 31] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Organic ultralong room temperature phosphorescence (OURTP) materials having stimuli-responsive attributes have attracted great attention due to their great potential in a wide variety of advanced applications. It is of fundamental importance but challengeable to develop stimuli-responsive OURTP materials, especially such materials with modulated optoelectronic properties in a controlled manner probably due to the lack of an authentic construction approach. Here, we propose an effective strategy for OURTP materials with controllably regulated stimuli-responsive properties by engineering the resonance linkage between flexible chain and phosphor units. A quantitative parameter to demonstrate the stimuli-responsive capacity is also established by the responsivity rate constant. The designed OURTP materials demonstrate efficient photoactivated OURTP with lifetimes up to 724 ms and tunable responsivity rate constants ranging from 0.132 to 0.308 min-1 upon continuous UV irradiation. Moreover, the applications of stimuli-responsive resonance OURTP materials have been illustrated by the rewritable paper for snapshot and Morse code for multiple information encryption. Our works, which enable the accomplishment of OURTP materials capable of on-demand manipulated optical properties, demonstrate a viable design to explore smart OURTP materials, giving deep insights into the dynamically stimuli-responsive process.
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Affiliation(s)
- Ye Tao
- State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China
| | - Chang Liu
- State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China
| | - Yuan Xiang
- State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China
| | - Zijie Wang
- State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China
| | - Xudong Xue
- State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China
| | - Ping Li
- State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China
| | - Huanhuan Li
- State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China
| | - Gaozhan Xie
- State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China
| | - Wei Huang
- State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China.,Institute of Flexible Electronics (IFE), Northwestern Polytechnical University, Xi'an 710072, Shanxi, China
| | - Runfeng Chen
- State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China
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14
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Hong X, Zhang D, Yin C, Wang Q, Zhang Y, Huang T, Wei J, Zeng X, Meng G, Wang X, Li G, Yang D, Ma D, Duan L. TADF molecules with π-extended acceptors for simplified high-efficiency blue and white organic light-emitting diodes. Chem 2022. [DOI: 10.1016/j.chempr.2022.02.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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15
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Masimukku N, Gudeika D, Volyniuk D, Bezvikonnyi O, Simokaitiene J, Matulis V, Lyakhov D, Azovskyi V, Gražulevičius JV. Bipolar 1,8-naphthalimides showing high electron mobility and red AIE-active TADF for OLED applications. Phys Chem Chem Phys 2022; 24:5070-5082. [PMID: 35146498 DOI: 10.1039/d1cp05942d] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Aiming to design bipolar organic semiconductors with high electron mobility and efficient red thermally activated delayed fluorescence (TADF), three donor-acceptor compounds were designed and synthesized selecting 1,8-naphthalimide as an acceptor and phenoxazine, 3,7-di-tert-butylphenothiazine or 2,7-di-tert-butyldimethyl-9,10-dihydroacridine as donor moieties. Aggregation induced emission enhancement was detected for the compounds causing efficient TADF in the solid-state. Photoluminescence quantum yields up to 77% were observed for the films of the compounds doped in a host. The compounds exhibited small singlet-triplet splitting (0.03-0.05 eV), and high reverse intersystem crossing rates of 2.08 × 105-1.13 × 106 s-1. The compounds were characterized by satisfactory hole and electron-injecting properties with ionization potentials of 5.72-5.83 eV and electron affinities of 2.79-2.91 eV. Bipolar charge transport was revealed by time of flight measurements. Electron transport with low dispersity and mobilities exceeding 2 × 10-3 cm2 V-1 s-1 was observed at an electric field of 4.6 × 105 V cm-1. The compounds were used as emitters in red electroluminescent devices, which showed maximum external quantum efficiencies up to 8.2%. Utilization of host-guest systems as light-emitting materials with hosts preferably transporting holes and TADF guests which preferably transport electrons allowed maximum efficiencies to be achieved at a practical brightness of 700-2200 cd m-2. DFT calculations of the geometry, electronic structure, absorption and photoluminescence spectra of all compounds were carried out to prove the conclusions drawn from the experiment. The results of the calculations clearly show that the first excited state for all compounds is the intramolecular charge transfer state. Quantitative analysis of the separation degree of electronic density during excitation allows the observed dependence of the blue shift value in the absorption and emission spectra on the increasing polarity of the solvent to be explained.
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Affiliation(s)
- Naveen Masimukku
- Kaunas University of Technology, Department of Polymer Chemistry and Technology, K. Baršausko g. 59, LT51423, Kaunas, Lithuania.
| | - Dalius Gudeika
- Kaunas University of Technology, Department of Polymer Chemistry and Technology, K. Baršausko g. 59, LT51423, Kaunas, Lithuania.
| | - Dmytro Volyniuk
- Kaunas University of Technology, Department of Polymer Chemistry and Technology, K. Baršausko g. 59, LT51423, Kaunas, Lithuania.
| | - Oleksandr Bezvikonnyi
- Kaunas University of Technology, Department of Polymer Chemistry and Technology, K. Baršausko g. 59, LT51423, Kaunas, Lithuania.
| | - Jurate Simokaitiene
- Kaunas University of Technology, Department of Polymer Chemistry and Technology, K. Baršausko g. 59, LT51423, Kaunas, Lithuania.
| | - Vitaly Matulis
- Belarusian State University, 4, Nezavisimosti Avenue, 220030, Minsk, Republic of Belarus
| | - Dmitry Lyakhov
- Computer, Electrical and Mathematical Science and Engineering Division, 4700 King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Volodymyr Azovskyi
- Faculty of Physics, Taras Shevchenko National University of Kyiv, 64/13 Volodymyrs'ka Str., 01601 Kyiv, Ukraine
| | - Juozas Vidas Gražulevičius
- Kaunas University of Technology, Department of Polymer Chemistry and Technology, K. Baršausko g. 59, LT51423, Kaunas, Lithuania.
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16
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Wu X, Huang JW, Su BK, Wang S, Yuan L, Zheng WQ, Zhang H, Zheng YX, Zhu W, Chou PT. Fabrication of Circularly Polarized MR-TADF Emitters with Asymmetrical Peripheral-Lock Enhancing Helical B/N-Doped Nanographenes. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2105080. [PMID: 34693564 DOI: 10.1002/adma.202105080] [Citation(s) in RCA: 69] [Impact Index Per Article: 34.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Revised: 09/01/2021] [Indexed: 06/13/2023]
Abstract
Circularly polarized thermally activated delayed fluorescence (CP-TADF) and multiple-resonance thermally activated delayed fluorescence (MR-TADF), which exhibit novel circularly polarized luminescence and excellent color fidelity, respectively, have gained immense popularity. In this study, integrated CP-TADF and MR-TADF (CPMR-TADF) are prepared by strategic design and synthesis of asymmetrical peripherally locked enantiomers, which are separated and denoted as (P,P″,P″)-/(M,M″,M″)-BN4 and (P,P″,P″)-/(M,M″,M″)-BN5 and exhibit TADF and circularly polarized light (CPL) properties. As the entire molecular frame participates in the frontier molecular orbitals, the resulting helical chirality of (+)/(-)-BN4- and (+)/(-)-BN5-based solution-processed organic light-emitting diodes (OLEDs) helps in achieving a narrow full width at half maximum (FWHM) of 49/49 and 48/48 nm and a high maximum external quantum efficiency (EQE) of 20.6%/19.0% and 22.0%/26.5%, respectively. Importantly, unambiguous circularly polarized electroluminescence signals with dissymmetry factors (gEL ) of +3.7 × 10-3 /-3.1 × 10-3 (BN4) and +1.9 × 10-3 /-1.6 × 10-3 (BN5) are obtained. The results indicate successful exploitation of CPMR-TADF-emitter-based OLEDs to exhibit three characteristics: high efficiency, color purity, and circularly polarized light.
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Affiliation(s)
- Xiugang Wu
- School of Materials Science and Engineering, Jiangsu Collaboration Innovation Center of Photovoltaic Science and Engineering, Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and Applications, National Experimental Demonstration Center for Materials Science and Engineering, Changzhou University, Changzhou, 213164, China
| | - Jing-Wei Huang
- School of Materials Science and Engineering, Jiangsu Collaboration Innovation Center of Photovoltaic Science and Engineering, Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and Applications, National Experimental Demonstration Center for Materials Science and Engineering, Changzhou University, Changzhou, 213164, China
| | - Bo-Kang Su
- Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan
| | - Sai Wang
- School of Materials Science and Engineering, Jiangsu Collaboration Innovation Center of Photovoltaic Science and Engineering, Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and Applications, National Experimental Demonstration Center for Materials Science and Engineering, Changzhou University, Changzhou, 213164, China
| | - Li Yuan
- School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China
| | - Wei-Qiong Zheng
- School of Materials Science and Engineering, Jiangsu Collaboration Innovation Center of Photovoltaic Science and Engineering, Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and Applications, National Experimental Demonstration Center for Materials Science and Engineering, Changzhou University, Changzhou, 213164, China
| | - Hu Zhang
- School of Materials Science and Engineering, Jiangsu Collaboration Innovation Center of Photovoltaic Science and Engineering, Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and Applications, National Experimental Demonstration Center for Materials Science and Engineering, Changzhou University, Changzhou, 213164, China
| | - You-Xuan Zheng
- School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China
| | - Weiguo Zhu
- School of Materials Science and Engineering, Jiangsu Collaboration Innovation Center of Photovoltaic Science and Engineering, Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and Applications, National Experimental Demonstration Center for Materials Science and Engineering, Changzhou University, Changzhou, 213164, China
| | - Pi-Tai Chou
- Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan
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17
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Ihn S, Jeong D, Kwon ES, Kim S, Chung YS, Sim M, Chwae J, Koishikawa Y, Jeon SO, Kim JS, Kim J, Nam S, Kim I, Park S, Kim DS, Choi H, Kim S. Dipole Moment- and Molecular Orbital-Engineered Phosphine Oxide-Free Host Materials for Efficient and Stable Blue Thermally Activated Delayed Fluorescence. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2102141. [PMID: 34802190 PMCID: PMC8787426 DOI: 10.1002/advs.202102141] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Revised: 09/27/2021] [Indexed: 05/26/2023]
Abstract
To utilize thermally activated delayed fluorescence (TADF) technology for future displays, it is necessary to develop host materials which harness the full potential of blue TADF emitters. However, no publication has reported such hosts yet. Although the most popular host for blue TADF, bis[2-(diphenylphosphino)phenyl]ether oxide (DPEPO) guarantees high-maximum external quantum efficiency (EQEmax ) TADF devices, they exhibit very short operational lifetimes. In contrast, long-lifespan blue TADF devices employing stable hosts such as 3',5-di(9H-carbazol-9-yl)-[1,1'-biphenyl]-3-carbonitrile (mCBP-CN) exhibit much lower EQEmax than the DPEPO-employed devices. Here, an elaborative approach for designing host molecules is suggested to achieve simultaneously stable and efficient blue TADF devices. The approach is based on engineering the molecular geometry, ground- and excited-state dipole moments of host molecules. The engineered hosts significantly enhance delayed fluorescence quantum yields of TADF emitters, as stabilizing the charge-transfer excited states of the TADF emitters and suppressing exciton quenching, and improve the charge balance. Moreover, they exhibit both photochemical and electrochemical stabilities. The best device employing one of the engineered hosts exhibits 79% increase in EQEmax compared to the mCBP-CN-employed device, together with 140% and 92-fold increases in operational lifetime compared to the respective mCBP-CN- and the DPEPO-based devices.
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Affiliation(s)
- Soo‐Ghang Ihn
- Samsung Advanced Institute of TechnologySamsung Electronics Co., LTD130 Samsung‐ro, Yeongtong‐guSuwon‐siGyeonggi‐do16678Korea
| | - Daun Jeong
- CSE teamData and Information Technology CenterSamsung Electronics Co., LTD1 Samsungjeonja‐roHwaseong‐siGyeonggi‐do18448Korea
| | - Eun Suk Kwon
- Samsung Advanced Institute of TechnologySamsung Electronics Co., LTD130 Samsung‐ro, Yeongtong‐guSuwon‐siGyeonggi‐do16678Korea
| | - Sangmo Kim
- Samsung Advanced Institute of TechnologySamsung Electronics Co., LTD130 Samsung‐ro, Yeongtong‐guSuwon‐siGyeonggi‐do16678Korea
| | - Yeon Sook Chung
- Samsung Advanced Institute of TechnologySamsung Electronics Co., LTD130 Samsung‐ro, Yeongtong‐guSuwon‐siGyeonggi‐do16678Korea
| | - Myungsun Sim
- Samsung Advanced Institute of TechnologySamsung Electronics Co., LTD130 Samsung‐ro, Yeongtong‐guSuwon‐siGyeonggi‐do16678Korea
| | - Jun Chwae
- Samsung Advanced Institute of TechnologySamsung Electronics Co., LTD130 Samsung‐ro, Yeongtong‐guSuwon‐siGyeonggi‐do16678Korea
| | - Yasushi Koishikawa
- Samsung Advanced Institute of TechnologySamsung Electronics Co., LTD130 Samsung‐ro, Yeongtong‐guSuwon‐siGyeonggi‐do16678Korea
| | - Soon Ok Jeon
- Samsung Advanced Institute of TechnologySamsung Electronics Co., LTD130 Samsung‐ro, Yeongtong‐guSuwon‐siGyeonggi‐do16678Korea
| | - Jong Soo Kim
- Samsung Advanced Institute of TechnologySamsung Electronics Co., LTD130 Samsung‐ro, Yeongtong‐guSuwon‐siGyeonggi‐do16678Korea
| | - Joonghyuk Kim
- Samsung Advanced Institute of TechnologySamsung Electronics Co., LTD130 Samsung‐ro, Yeongtong‐guSuwon‐siGyeonggi‐do16678Korea
| | - Sungho Nam
- Samsung Advanced Institute of TechnologySamsung Electronics Co., LTD130 Samsung‐ro, Yeongtong‐guSuwon‐siGyeonggi‐do16678Korea
| | - Inkoo Kim
- CSE teamData and Information Technology CenterSamsung Electronics Co., LTD1 Samsungjeonja‐roHwaseong‐siGyeonggi‐do18448Korea
| | - Sangho Park
- Samsung Advanced Institute of TechnologySamsung Electronics Co., LTD130 Samsung‐ro, Yeongtong‐guSuwon‐siGyeonggi‐do16678Korea
| | - Dae Sin Kim
- CSE teamData and Information Technology CenterSamsung Electronics Co., LTD1 Samsungjeonja‐roHwaseong‐siGyeonggi‐do18448Korea
| | - Hyeonho Choi
- Samsung Advanced Institute of TechnologySamsung Electronics Co., LTD130 Samsung‐ro, Yeongtong‐guSuwon‐siGyeonggi‐do16678Korea
| | - Sunghan Kim
- Samsung Advanced Institute of TechnologySamsung Electronics Co., LTD130 Samsung‐ro, Yeongtong‐guSuwon‐siGyeonggi‐do16678Korea
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18
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Li Z, Yang XG, Zhang H, Zhang JR, Tian XK, Qin JH, Ma LF, Yan D. Near-infrared thermally activated delayed fluorescence of D–π-A–π-D difluoroboron complex for efficient singlet oxygen generation in aqueous media. Inorg Chem Front 2022. [DOI: 10.1039/d2qi01112c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
NIR TADF difluoroboron complex shows extremely small ΔEST, broad absorption range (350–650 nm), high 1O2 quantum yield (62%), and selective photodynamic killing of Gram-positive bacteria.
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Affiliation(s)
- Ziyong Li
- College of Chemistry and Chemical Engineering, College of food and drug, Luoyang Normal University, Luoyang 471934, P. R. China
| | - Xiao-Gang Yang
- College of Chemistry and Chemical Engineering, College of food and drug, Luoyang Normal University, Luoyang 471934, P. R. China
| | - Haining Zhang
- College of Chemistry and Chemical Engineering, College of food and drug, Luoyang Normal University, Luoyang 471934, P. R. China
| | - Ji-Rui Zhang
- College of Chemistry and Chemical Engineering, College of food and drug, Luoyang Normal University, Luoyang 471934, P. R. China
| | - Xu-Ke Tian
- College of Chemistry and Chemical Engineering, College of food and drug, Luoyang Normal University, Luoyang 471934, P. R. China
| | - Jian-Huan Qin
- College of Chemistry and Chemical Engineering, College of food and drug, Luoyang Normal University, Luoyang 471934, P. R. China
| | - Lu-Fang Ma
- College of Chemistry and Chemical Engineering, College of food and drug, Luoyang Normal University, Luoyang 471934, P. R. China
| | - Dongpeng Yan
- College of Chemistry, Beijing Normal University, Beijing Key Laboratory of Energy Conversion and Storage Materials, Beijing 100875, P. R. China
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19
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Zhang J, Xie M, Xin Y, Han C, Xie L, Yi M, Xu H. Organophosphine‐Sandwiched Copper Iodide Cluster Enables Charge Trapping. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202111320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Jing Zhang
- Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education School of Chemistry and Materials Heilongjiang University 74 Xuefu Road Harbin 150080 P. R. China
| | - Mingchen Xie
- Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education School of Chemistry and Materials Heilongjiang University 74 Xuefu Road Harbin 150080 P. R. China
| | - Ying Xin
- Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education School of Chemistry and Materials Heilongjiang University 74 Xuefu Road Harbin 150080 P. R. China
| | - Chunmiao Han
- Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education School of Chemistry and Materials Heilongjiang University 74 Xuefu Road Harbin 150080 P. R. China
| | - Linghai Xie
- Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials (IAM) Nanjing University of Posts & Telecommunications 9 Wenyuan Road Nanjing 210023 P. R. China
| | - Mingdong Yi
- Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials (IAM) Nanjing University of Posts & Telecommunications 9 Wenyuan Road Nanjing 210023 P. R. China
| | - Hui Xu
- Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education School of Chemistry and Materials Heilongjiang University 74 Xuefu Road Harbin 150080 P. R. China
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20
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Zhang J, Xie M, Xin Y, Han C, Xie L, Yi M, Xu H. Organophosphine-Sandwiched Copper Iodide Cluster Enables Charge Trapping. Angew Chem Int Ed Engl 2021; 60:24894-24900. [PMID: 34545993 DOI: 10.1002/anie.202111320] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Revised: 09/20/2021] [Indexed: 11/11/2022]
Abstract
Herein, we report a feasible molecular design of the binuclear clusters featuring the n-p-n heterojunction of biligand-sandwiched inorganic units, which can be used as the effective charge trapper in ambipolar transistor memories with the large memory windows and the energy-saving operation. We found that the hole confinement on the p-type inorganic units is enhanced by spatial electronic anisotropy provided by the peripheral n-type organic phosphine ligands. The steric hindrance of the coordination sites, the insulating effect of the carbon-phosphorous single bonds and the parallel dual-ligand coordination mode jointly elongate the interunit distances to nanometer scale and restrain the intramolecular electronic communications, leading to the tunable and reliable charge trapping. Our results show that the spatial effect is crucial to further amplifying the electronic differences between organic and inorganic units for function enhancement.
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Affiliation(s)
- Jing Zhang
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials, Heilongjiang University, 74 Xuefu Road, Harbin, 150080, P. R. China
| | - Mingchen Xie
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials, Heilongjiang University, 74 Xuefu Road, Harbin, 150080, P. R. China
| | - Ying Xin
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials, Heilongjiang University, 74 Xuefu Road, Harbin, 150080, P. R. China
| | - Chunmiao Han
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials, Heilongjiang University, 74 Xuefu Road, Harbin, 150080, P. R. China
| | - Linghai Xie
- Key Laboratory for Organic Electronics and Information Displays &, Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing, 210023, P. R. China
| | - Mingdong Yi
- Key Laboratory for Organic Electronics and Information Displays &, Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing, 210023, P. R. China
| | - Hui Xu
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials, Heilongjiang University, 74 Xuefu Road, Harbin, 150080, P. R. China
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21
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Tian Y, Wang H, Man Y, Zhang N, Zhang J, Li Y, Han C, Xu H. Weaving host matrices with intermolecular hydrogen bonds for high-efficiency white thermally activated delayed fluorescence. Chem Sci 2021; 12:14519-14530. [PMID: 34881003 PMCID: PMC8580069 DOI: 10.1039/d1sc04188f] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Accepted: 10/07/2021] [Indexed: 01/14/2023] Open
Abstract
A thermally activated delayed fluorescence (TADF) white organic light-emitting diode (WOLED) holds great promise for low-cost, large-scale lighting applications. Nevertheless, manipulating exciton allocation in a white TADF single layer is still a challenge. Herein, we demonstrate that the exciton kinetic process of dually doped white TADF films is strongly dependent on the grid regularity of the host matrix. Intermolecular hydrogen bonds (IHBs) are used to weave the matrices of two host molecules DPEQPO and DPSQPO featuring four phosphine oxide (PO) groups and different IHB orientations. The DPSQPO matrix forms regular grids to uniformly disperse and separate dopants, while DPEQPO exhibits chaotic IHBs, in turn inducing a heterogeneous dopant distribution. As a consequence, in both photoluminescence and electroluminescence processes, in contrast to DPEQPO hosted systems with comparable singlet Förster resonance energy transfer and triplet Dexter energy transfer, DPSQPO provides a FRET-predominant exciton allocation between blue and yellow dopants, which markedly suppresses triplet quenching and improves the white color purity, resulting in a state-of-the-art external quantum efficiency up to 24.2% of its single-emissive-layer pure-white TADF diode, in contrast to 16.0% for DPEQPO based analogs. These results indicate the significance of host engineering for exciton kinetics and suggest the feasibility of host grid design for developing high-performance TADF lighting. A thermally activated delayed fluorescence (TADF) white organic light-emitting diode (WOLED) holds great promise for low-cost, large-scale lighting applications.![]()
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Affiliation(s)
- Yuee Tian
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education & School of Chemistry and Material Science, Heilongjiang University 74 Xuefu Road Harbin 150080 P. R. China
| | - Huiqin Wang
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education & School of Chemistry and Material Science, Heilongjiang University 74 Xuefu Road Harbin 150080 P. R. China
| | - Yi Man
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education & School of Chemistry and Material Science, Heilongjiang University 74 Xuefu Road Harbin 150080 P. R. China
| | - Nan Zhang
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education & School of Chemistry and Material Science, Heilongjiang University 74 Xuefu Road Harbin 150080 P. R. China
| | - Jing Zhang
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education & School of Chemistry and Material Science, Heilongjiang University 74 Xuefu Road Harbin 150080 P. R. China
| | - Ying Li
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education & School of Chemistry and Material Science, Heilongjiang University 74 Xuefu Road Harbin 150080 P. R. China
| | - Chunmiao Han
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education & School of Chemistry and Material Science, Heilongjiang University 74 Xuefu Road Harbin 150080 P. R. China
| | - Hui Xu
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education & School of Chemistry and Material Science, Heilongjiang University 74 Xuefu Road Harbin 150080 P. R. China
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22
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Exceptionally efficient deep blue anthracene-based luminogens: design, synthesis, photophysical, and electroluminescent mechanisms. Sci Bull (Beijing) 2021; 66:2090-2098. [PMID: 36654267 DOI: 10.1016/j.scib.2021.06.018] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Revised: 05/05/2021] [Accepted: 06/10/2021] [Indexed: 01/20/2023]
Abstract
Achieving high-efficiency deep blue emitter with CIEy < 0.06 (CIE, Commission Internationale de L'Eclairage) and external quantum efficiency (EQE) >10% has been a long-standing challenge for traditional fluorescent materials in organic light-emitting diodes (OLEDs). Here, we report the rational design and synthesis of two new deep blue luminogens: 4-(10-(4'-(9H-carbazol-9-yl)-2,5-dimethyl-[1,1'-biphenyl]-4-yl)anthracen-9-yl)benzonitrile (2M-ph-pCzAnBzt) and 4-(10-(4-(9H-carbazol-9-yl)-2,5-dimethylphenyl)anthracen-9-yl)benzonitrile (2M-pCzAnBzt). In particular, 2M-ph-pCzAnBzt produces saturated deep blue emissions in a non-doped electroluminescent device with an exceptionally high EQE of 10.44% and CIEx,y (0.151, 0.057). The unprecedented electroluminescent efficiency is attributed to the combined effects of higher-order reversed intersystem crossing and triplet-triplet up-conversion, which are supported by analysis of theoretical calculation, triplet sensitization experiments, as well as nanosecond transient absorption spectroscopy. This research offers a new approach to resolve the shortage of high efficiency deep blue fluorescent emitters.
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23
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Han C, Du R, Xu H, Han S, Ma P, Bian J, Duan C, Wei Y, Sun M, Liu X, Huang W. Ladder-like energy-relaying exciplex enables 100% internal quantum efficiency of white TADF-based diodes in a single emissive layer. Nat Commun 2021; 12:3640. [PMID: 34131127 PMCID: PMC8206214 DOI: 10.1038/s41467-021-23941-z] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Accepted: 05/14/2021] [Indexed: 11/17/2022] Open
Abstract
Development of white organic light-emitting diodes based on purely thermally activated delayed fluorescence with a single-emissive-layer configuration has been a formidable challenge. Here, we report the rational design of a donor-acceptor energy-relaying exciplex and its utility in fabricating single-emissive-layer, thermally activated delayed fluorescence-based white organic light-emitting diodes that exhibit 100% internal quantum efficiency, 108.2 lm W−1 power efficiency, and 32.7% external quantum efficiency. This strategy enables thin-film fabrication of an 8 cm × 8 cm thermally activated delayed fluorescence white organic light-emitting diodes (10 inch2) prototype with 82.7 lm W−1 power efficiency and 25.0% external quantum efficiency. Introduction of a phosphine oxide-based acceptor with a steric group to the exciplex limits donor-acceptor triplet coupling, providing dual levels of high-lying and low-lying triplet energy. Transient spectroscopic characterizations confirm that a ladder-like energy relaying occurs from the high-lying triplet level of the exciplex to a blue emitter, then to the low-lying triplet level of the phosphine oxide acceptor, and ultimately to the yellow emitter. Our results demonstrate the broad applicability of energy relaying in multicomponent systems for exciton harvesting, providing opportunities for the development of third-generation white organic light-emitting diode light sources. Realizing efficient white organic light-emitting diodes (WOLEDs) with a single thermally-activated delayed fluorescence (TADF) emissive layer remains a challenge. Here, the authors design energy-relaying exciplex hosts with multi-triplet excited states for efficient single-emissive-layer TADF WOLEDs.
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Affiliation(s)
- Chunmiao Han
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) & School of Chemistry and Material Science, Heilongjiang University, Harbin, PR China
| | - Ruiming Du
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) & School of Chemistry and Material Science, Heilongjiang University, Harbin, PR China
| | - Hui Xu
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) & School of Chemistry and Material Science, Heilongjiang University, Harbin, PR China.
| | - Sanyang Han
- Department of Chemistry, National University of Singapore, Singapore, Singapore
| | - Peng Ma
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) & School of Chemistry and Material Science, Heilongjiang University, Harbin, PR China
| | - Jinkun Bian
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) & School of Chemistry and Material Science, Heilongjiang University, Harbin, PR China
| | - Chunbo Duan
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) & School of Chemistry and Material Science, Heilongjiang University, Harbin, PR China
| | - Ying Wei
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) & School of Chemistry and Material Science, Heilongjiang University, Harbin, PR China
| | - Mingzhi Sun
- Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) & School of Chemistry and Material Science, Heilongjiang University, Harbin, PR China
| | - Xiaogang Liu
- Department of Chemistry, National University of Singapore, Singapore, Singapore.
| | - Wei Huang
- Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Nanjing Tech University, Nanjing, China. .,Frontiers Science Center for Flexible Electronics (FSCFE) & Shaanxi Institute of Flexible Electronics (SIFE), Northwestern Polytechnical University (NPU), Xi'an, China.
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24
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Huang Y, Hu Y, Han Y, Ou Y, Huo Y, Li X, Chen Q. Direct Synthesis of ortho-Halogenated Arylphosphonates via a Three-Component Reaction Involving Arynes. J Org Chem 2021; 86:7010-7018. [PMID: 33881847 DOI: 10.1021/acs.joc.1c00550] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
A three-component reaction involving arynes, trialkyl phosphites, and halides has been achieved under mild reaction conditions. This transformation provides a direct synthetic approach to ortho-halogenated arylphosphonates, which could be rapidly converted to diversely ortho-functionalized arylphosphorus compounds.
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Affiliation(s)
- Yuanting Huang
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, P. R. China
| | - Yifan Hu
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, P. R. China
| | - Yukun Han
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, P. R. China
| | - Yingcong Ou
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, P. R. China
| | - Yanping Huo
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, P. R. China
| | - Xianwei Li
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, P. R. China
| | - Qian Chen
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, P. R. China
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25
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Liang W, Yang Y, Yang M, Zhang M, Li C, Ran Y, Lan J, Bin Z, You J. Dearomatizing [4+1] Spiroannulation of Naphthols: Discovery of Thermally Activated Delayed Fluorescent Materials. Angew Chem Int Ed Engl 2021; 60:3493-3497. [PMID: 33084206 DOI: 10.1002/anie.202012842] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Revised: 10/18/2020] [Indexed: 01/03/2023]
Abstract
Disclosed here is a palladium-catalyzed direct [4+1] spiroannulation of ortho-C-H bonds of naphthols with cyclic diaryliodonium salts to construct spirofluorenyl naphthalenones (SFNP) under mild reaction conditions. This spiroannulation directly transforms the hydroxy group into a carbonyl group, and also tolerates reactive functional groups such as the halo groups, which provide an opportunity to rapidly assemble structurally new thermally activated delayed fluorescent (TADF) materials that feature a carbonyl group with an adjacent spirofluorenyl unit as the acceptor. As an illustrated example, the OLED device utilizing the assembled DMAC-SFNP as the host material exhibits a low turn-on voltage of 2.5 V and an ultra-high external quantum efficiency of 32.2 %. This work provides inspiration for structurally new TADF materials, and also displays the potential of C-H activation as a synthetic strategy for the innovation of optoelectronic materials.
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Affiliation(s)
- Wenbo Liang
- Key Laboratory of Green Chemistry and Technology of Ministry of Education, College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu, 610064, P. R. China
| | - Yudong Yang
- Key Laboratory of Green Chemistry and Technology of Ministry of Education, College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu, 610064, P. R. China
| | - Mufan Yang
- Key Laboratory of Green Chemistry and Technology of Ministry of Education, College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu, 610064, P. R. China
| | - Min Zhang
- Key Laboratory of Green Chemistry and Technology of Ministry of Education, College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu, 610064, P. R. China
| | - Chengming Li
- Key Laboratory of Green Chemistry and Technology of Ministry of Education, College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu, 610064, P. R. China
| | - You Ran
- Key Laboratory of Green Chemistry and Technology of Ministry of Education, College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu, 610064, P. R. China
| | - Jingbo Lan
- Key Laboratory of Green Chemistry and Technology of Ministry of Education, College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu, 610064, P. R. China
| | - Zhengyang Bin
- Key Laboratory of Green Chemistry and Technology of Ministry of Education, College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu, 610064, P. R. China
| | - Jingsong You
- Key Laboratory of Green Chemistry and Technology of Ministry of Education, College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu, 610064, P. R. China
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26
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Jiang H, Jin J, Wang Z, Wang W, Chen R, Tao Y, Xue Q, Zheng C, Xie G, Huang W. Constructing Donor-Resonance-Donor Molecules for Acceptor-Free Bipolar Organic Semiconductors. RESEARCH (WASHINGTON, D.C.) 2021; 2021:9525802. [PMID: 38617381 PMCID: PMC11014465 DOI: 10.34133/2021/9525802] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Accepted: 12/29/2020] [Indexed: 04/16/2024]
Abstract
Organic semiconductors with bipolar transporting character are highly attractive as they offer the possibility to achieve high optoelectronic performance in simple device structures. However, the continual efforts in preparing bipolar materials are focusing on donor-acceptor (D-A) architectures by introducing both electron-donating and electron-withdrawing units into one molecule in static molecular design principles. Here, we report a dynamic approach to construct bipolar materials using only electron-donating carbazoles connected by N-P=X resonance linkages in a donor-resonance-donor (D-r-D) structure. By facilitating the stimuli-responsive resonance variation, these D-r-D molecules exhibit extraordinary bipolar properties by positively charging one donor of carbazole in enantiotropic N+=P-X- canonical forms for electron transport without the involvement of any acceptors. With thus realized efficient and balanced charge transport, blue and deep-blue phosphorescent organic light emitting diodes hosted by these D-r-D molecules show high external quantum efficiencies up to 16.2% and 18.3% in vacuum-deposited and spin-coated devices, respectively. These results via the D-r-D molecular design strategy represent an important concept advance in constructing bipolar organic optoelectronic semiconductors dynamically for high-performance device applications.
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Affiliation(s)
- He Jiang
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China
| | - Jibiao Jin
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China
| | - Zijie Wang
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China
| | - Wuji Wang
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China
| | - Runfeng Chen
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China
| | - Ye Tao
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China
| | - Qin Xue
- Department of Physical Science and Technology, Central China Normal University, Wuhan 430079, China
| | - Chao Zheng
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China
| | - Guohua Xie
- Sauvage Center for Molecular Sciences, Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, Department of Chemistry, Wuhan University, Wuhan 430072, China
| | - Wei Huang
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China
- Frontiers Science Center for Flexible Electronics (FSCFE), Shaanxi Institute of Flexible Electronics (SIFE) & Shaanxi Institute of Biomedical Materials and Engineering (SIBME), Northwestern Polytechnical University (NPU), 127 West Youyi Road, Xi'an 710072, China
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27
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Liang W, Yang Y, Yang M, Zhang M, Li C, Ran Y, Lan J, Bin Z, You J. Dearomatizing [4+1] Spiroannulation of Naphthols: Discovery of Thermally Activated Delayed Fluorescent Materials. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202012842] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Wenbo Liang
- Key Laboratory of Green Chemistry and Technology of Ministry of Education College of Chemistry Sichuan University 29 Wangjiang Road Chengdu 610064 P. R. China
| | - Yudong Yang
- Key Laboratory of Green Chemistry and Technology of Ministry of Education College of Chemistry Sichuan University 29 Wangjiang Road Chengdu 610064 P. R. China
| | - Mufan Yang
- Key Laboratory of Green Chemistry and Technology of Ministry of Education College of Chemistry Sichuan University 29 Wangjiang Road Chengdu 610064 P. R. China
| | - Min Zhang
- Key Laboratory of Green Chemistry and Technology of Ministry of Education College of Chemistry Sichuan University 29 Wangjiang Road Chengdu 610064 P. R. China
| | - Chengming Li
- Key Laboratory of Green Chemistry and Technology of Ministry of Education College of Chemistry Sichuan University 29 Wangjiang Road Chengdu 610064 P. R. China
| | - You Ran
- Key Laboratory of Green Chemistry and Technology of Ministry of Education College of Chemistry Sichuan University 29 Wangjiang Road Chengdu 610064 P. R. China
| | - Jingbo Lan
- Key Laboratory of Green Chemistry and Technology of Ministry of Education College of Chemistry Sichuan University 29 Wangjiang Road Chengdu 610064 P. R. China
| | - Zhengyang Bin
- Key Laboratory of Green Chemistry and Technology of Ministry of Education College of Chemistry Sichuan University 29 Wangjiang Road Chengdu 610064 P. R. China
| | - Jingsong You
- Key Laboratory of Green Chemistry and Technology of Ministry of Education College of Chemistry Sichuan University 29 Wangjiang Road Chengdu 610064 P. R. China
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28
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Wang Y, Shi L, Ma D, Xu S, Wu W, Xu L, Panahandeh-Fard M, Zhu X, Wang B, Liu B. Tumor-Activated and Metal-Organic Framework Assisted Self-Assembly of Organic Photosensitizers. ACS NANO 2020; 14:13056-13068. [PMID: 33016697 DOI: 10.1021/acsnano.0c04518] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Tumor accumulation and intratumoral singlet oxygen (1O2) generation efficiency of photosensitizers (PSs) are two essential factors that determine their photodynamic therapy (PDT) efficacies. How to maximize the PS performance at the tumor site is of great research interest. Herein, we report a metal-organic framework (ZIF-8, ZIF = zeolitic imidazolate framework) assisted in vivo self-assembly nanoplatform, ZIF-8-PMMA-S-S-mPEG, as an effective tool for organic PS payloads to achieve efficient PDT. Using an organic PS with aggregation-induced emission as an example, under intratumoral bioreduction, PS-loaded ZIF-8-PMMA-S-S-mPEG (PS@ZIF-8-PMMA-S-S-mPEG) was self-assembled into large ordered hydrophobic clusters, which greatly enhance tumor retention and accumulation of the PS. Moreover, hydrophobic ZIF-8 assemblies greatly isolate the loaded PSs from water and improve O2 transport for the PSs to effectively produce 1O2 inside tumors under light irradiation. The organic PS is therefore endowed with optimal tumor accumulation and intratumoral 1O2 production, demonstrating the effectiveness of the developed self-assembly strategy in PDT application.
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Affiliation(s)
- Yuanbo Wang
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117585, Singapore
| | - Leilei Shi
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117585, Singapore
| | - Dou Ma
- Key Laboratory of Cluster Science, Ministry of Education, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, 5 South Zhongguancun Street, Beijing 100081, China
| | - Shidang Xu
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117585, Singapore
| | - Wenbo Wu
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117585, Singapore
| | - Li Xu
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Majid Panahandeh-Fard
- Nanoscience and Nanotechnology Initiative (NUSNNI)-Nanocore, National University of Singapore, Singapore 117576, Singapore
| | - Xinyuan Zhu
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Bo Wang
- Key Laboratory of Cluster Science, Ministry of Education, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, 5 South Zhongguancun Street, Beijing 100081, China
| | - Bin Liu
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117585, Singapore
- Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City, Fuzhou 350207, China
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29
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Godumala M, Hwang J, Kang H, Jeong JE, Harit AK, Cho MJ, Woo HY, Park S, Choi DH. High-Performance, Solution-Processable Thermally Activated Delayed Fluorescent Organic Light-Emitting Diodes Realized via the Adjustment of the Composition of the Organoboron Acceptor Monomer in Copolymer Host Materials. ACS APPLIED MATERIALS & INTERFACES 2020; 12:35300-35310. [PMID: 32654477 DOI: 10.1021/acsami.0c10293] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Organic polymers that exhibit features pertinent to functioning as host materials for thermally activated delayed fluorescence (TADF) emitters have considerable potential in solution-processable organic light-emitting diodes (OLEDs), allowing simple, low-cost, and large-area applications. In particular, polymer hosts have superior characteristics, including facile functionality to introduce various electron donor and acceptor entities, the ability to uniformly disperse and contain small molecular dopants, and the ability to produce more smooth and homogeneous films, compared to those of their small-molecule counterparts. This manuscript describes the design and development of three new styrene-based copolymers (ABP91, ABP73, and ABP55) bearing diphenylacridine as the electron donor and 2,12-di-tert-butyl-7-phenyl-5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracene as the electron acceptor. In particular, ABP91, ABP73, and ABP55 were synthesized via variations in the ratio of donor to acceptor monomers to substantiate their influence in OLED applications. With the ability of the styrene backbone of interrupting the direct electronic coupling between the adjacent electron donor and acceptor entities through non-conjugated linkages, high triplet energy can be inherited by the resulting polymers (>2.70 eV). Furthermore, these materials manifest thermal robustness through high decomposition temperatures (between 348 and 366 °C) and high glass transition temperatures (between 234 and 277 °C). Consequently, solution-processable OLEDs fabricated using the newly synthesized copolymers as host materials and the familiar t4CzIPN as a green-emissive TADF dopant deliver state-of-the-art performance with maximum external quantum efficiencies of 21.8, 22.2, and 19.7% for ABP91, ABP73, and ABP55, respectively. To our knowledge, this is, to date, the best performance reported when organic polymers are used as host materials in solution-processable TADF OLEDs. The pragmatic outcomes obtained in this study can provide useful insights into the structure-property relationship to the OLED community for the further development of efficient polymer hosts for use in solution-processable TADF OLEDs.
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Affiliation(s)
- Mallesham Godumala
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Jinhyo Hwang
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Hyunchul Kang
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Ji-Eun Jeong
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Amit Kumar Harit
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Min Ju Cho
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Han Young Woo
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Sungnam Park
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Dong Hoon Choi
- Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
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30
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Molecular Configuration Fixation with C–H···F Hydrogen Bonding for Thermally Activated Delayed Fluorescence Acceleration. Chem 2020. [DOI: 10.1016/j.chempr.2020.04.021] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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31
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Masimukku N, Gudeika D, Bezvikonnyi O, Syvorotka I, Keruckiene R, Volyniuk D, Grazulevicius JV. Aryl-substituted acridanes as hosts for TADF-based OLEDs. Beilstein J Org Chem 2020; 16:989-1000. [PMID: 32509030 PMCID: PMC7237810 DOI: 10.3762/bjoc.16.88] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Accepted: 04/30/2020] [Indexed: 11/24/2022] Open
Abstract
Four aryl-substituted acridan derivatives were designed, synthesized and characterized as electroactive materials for organic light emitting diodes based on emitters exhibiting thermally activated delayed fluorescence. These compounds possessed relatively high thermal stability with glass-transition temperatures being in the range of 79–97 °C. The compounds showed oxidation bands arising from acridanyl groups in the range of 0.31–038 V. Ionization potentials of the solid films ranged from 5.39 to 5.62 eV. The developed materials were characterized by triplet energies higher than 2.5 eV. The layer of 10-ethyl-9,9-dimethyl-2,7-di(naphthalen-1-yl)-9,10-dihydroacridine demonstrated hole mobilities reaching10−3 cm2/V·s at electric fields higher then ca. 2.5 × 105 V/cm. The selected compounds were used as hosts in electroluminescent devices which demonstrated maximum external quantum efficiencies up to 3.2%.
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Affiliation(s)
- Naveen Masimukku
- Department of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilenu pl. 19, LT-50254, Kaunas, Lithuania
| | - Dalius Gudeika
- Department of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilenu pl. 19, LT-50254, Kaunas, Lithuania
| | - Oleksandr Bezvikonnyi
- Department of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilenu pl. 19, LT-50254, Kaunas, Lithuania
| | - Ihor Syvorotka
- Scientific Research Company "Electron-Carat", 202 Stryska Str. 79031, Lviv, Ukraine
| | - Rasa Keruckiene
- Department of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilenu pl. 19, LT-50254, Kaunas, Lithuania
| | - Dmytro Volyniuk
- Department of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilenu pl. 19, LT-50254, Kaunas, Lithuania
| | - Juozas V Grazulevicius
- Department of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilenu pl. 19, LT-50254, Kaunas, Lithuania
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32
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Ban X, Chen F, Pan J, Liu Y, Zhu A, Jiang W, Sun Y. Exciplex Formation and Electromer Blocking for Highly Efficient Blue Thermally Activated Delayed Fluorescence OLEDs with All-Solution-Processed Organic Layers. Chemistry 2020; 26:3090-3102. [PMID: 31837285 DOI: 10.1002/chem.201904415] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2019] [Revised: 12/01/2019] [Indexed: 11/08/2022]
Abstract
Highly efficient solution-processable emitters are greatly desired to develop low-cost organic light-emitting diodes (OLEDs). The recently developed thermally activated delayed fluorescence (TADF) materials are promising candidates, but blue TADF materials compatible with the all-solution-process have still not been achieved. Here, a series of TADF materials, named X-4CzCN, are developed by introducing the bulky units through an unconjugated linker, which realizes high molecular weight to enhance the solvent resistance ability without disturbing the blue TADF feature. Meanwhile, the peripheral wrapping groups efficiently inhibit the triplet-triplet and triplet-polaron quenching by isolating the energy-transfer and charge-transporting channels. The photophysical measurements indicate that a small variation in peripheral unit will have a noticeable effect on the luminescence efficiency. The enlarged volume of peripheral units will make the electroluminescent spectra blueshift, while enhancing the energy transfer of exciplex and blocking the energy leakage of electromer can facilitate the exciton utilization. As a result, the fully solution-processed blue OLED achieves a CIE of (0.16, 0.27), a low turn on voltage of 2.9 eV, and a high external quantum efficiency of 20.6 %. As far as we known, this is the first report of all-solution-processed TADF OLEDs with blue emission, which exhibits a high efficiency even comparable to the vacuum-deposited devices.
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Affiliation(s)
- Xinxin Ban
- Jiangsu Key Laboratory of Function Control Technology for, Advanced Materials, School of Chemical Engineering, Jiangsu Ocean University, Jiangsu, 222005, P. R. China.,School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, P. R. China
| | - Feng Chen
- Jiangsu Key Laboratory of Function Control Technology for, Advanced Materials, School of Chemical Engineering, Jiangsu Ocean University, Jiangsu, 222005, P. R. China
| | - Jie Pan
- Jiangsu Key Laboratory of Function Control Technology for, Advanced Materials, School of Chemical Engineering, Jiangsu Ocean University, Jiangsu, 222005, P. R. China
| | - Yan Liu
- Jiangsu Key Laboratory of Function Control Technology for, Advanced Materials, School of Chemical Engineering, Jiangsu Ocean University, Jiangsu, 222005, P. R. China
| | - Aiyun Zhu
- Jiangsu Key Laboratory of Function Control Technology for, Advanced Materials, School of Chemical Engineering, Jiangsu Ocean University, Jiangsu, 222005, P. R. China
| | - Wei Jiang
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, P. R. China
| | - Yueming Sun
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, P. R. China
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33
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Li H, Zhi Y, Dai Y, Jiang Y, Yang Q, Li M, Li P, Tao Y, Li H, Huang W, Chen R. Asymmetric Thermally Activated Delayed Fluorescence Materials With Aggregation-Induced Emission for High-Efficiency Organic Light-Emitting Diodes. Front Chem 2020; 8:49. [PMID: 32175303 PMCID: PMC7054483 DOI: 10.3389/fchem.2020.00049] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Accepted: 01/15/2020] [Indexed: 01/29/2023] Open
Abstract
The exploitation of thermally activated delayed fluorescence (TADF) emitters with aggregation-induced emission is highly prerequisite for the construction of highly efficient electroluminescent devices in materials science. Herein, two asymmetric TADF emitters of SFCOCz and SFCODPAC with charming aggregation-induced emission are expediently designed and prepared based on highly twisted strong electron-withdrawing acceptor (A) of sulfurafluorene (SF)-modified ketone (CO) and arylamine donor (D) in D1-A-D2 architecture by simple synthetic procedure in high yields. High photoluminescence quantum yields up to 73% and small singlet-triplet splitting of 0.03 eV; short exciton lifetimes are obtained in the resultant molecules. Strikingly, efficient non-doped and doped TADF organic light-emitting diodes (OLEDs) facilitated by these emitters show high luminance of 5,598 and 11,595 cd m-2, current efficiencies (CEs) of 16.8 and 35.6 cd/A, power efficiencies (PEs) of 9.1 and 29.8 lm/W, and external quantum efficiencies (EQEs) of 7.5 and 15.9%, respectively. This work furnishes a concrete instance in exploring efficient TADF emitter, which is highly conducive and encouraging in stimulating the development of TADF OLEDs with high brightness and excellent efficiencies simultaneously.
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Affiliation(s)
- Huanhuan Li
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications, Nanjing, China
| | - Yibin Zhi
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications, Nanjing, China
| | - Yizhong Dai
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications, Nanjing, China
| | - Yunbo Jiang
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications, Nanjing, China
| | - Qingqing Yang
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications, Nanjing, China
| | - Mingguang Li
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications, Nanjing, China
| | - Ping Li
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications, Nanjing, China
| | - Ye Tao
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications, Nanjing, China
| | - Hui Li
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications, Nanjing, China
| | - Wei Huang
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications, Nanjing, China
- Institute of Flexible Electronics, Northwestern Polytechnical University, Xi'an, China
| | - Runfeng Chen
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications, Nanjing, China
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34
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Gao F, Du R, Wei Y, Xu H. Optimizing energy transfer for highly efficient single-emissive-layer white thermally activated delayed fluorescence organic light-emitting diodes. OPTICS LETTERS 2019; 44:5727-5730. [PMID: 31774764 DOI: 10.1364/ol.44.005727] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Accepted: 09/06/2019] [Indexed: 06/10/2023]
Abstract
Thermally activated delayed fluorescence (TADF) white organic light-emitting diodes (WOLEDs) with simplified structures have great potential for daily lighting applications. However, the complicated energy and charge transfer processes between TADF emitters impede the development of single-layer white TADF systems. Here we demonstrate high-efficiency WOLEDs with single-emissive layers composed of blue and yellow TADF emitters with appropriate steric hindrances and energy gaps, which optimize the energy transfer from blue to yellow dopants for rational exciton allocation. As a consequence, the single-emissive-layer WOLEDs achieve the maximum external quantum efficiency beyond 20% and small roll-offs, which are among the best results of full-TADF WOLEDs.
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35
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Li Y, Wei Q, Cao L, Fries F, Cucchi M, Wu Z, Scholz R, Lenk S, Voit B, Ge Z, Reineke S. Organic Light-Emitting Diodes Based on Conjugation-Induced Thermally Activated Delayed Fluorescence Polymers: Interplay Between Intra- and Intermolecular Charge Transfer States. Front Chem 2019; 7:688. [PMID: 31709224 PMCID: PMC6819504 DOI: 10.3389/fchem.2019.00688] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Accepted: 10/04/2019] [Indexed: 11/17/2022] Open
Abstract
In this work, interactions between different host materials and a blue TADF polymer named P1 are systematically investigated. In photoluminescence, the host can have substantial impact on the photoluminescence quantum yield (PLQY) and the intensity of delayed fluorescence (ΦDF), where more than three orders of magnitude difference of ΦDF in various hosts is observed, resulting from a polarity effect of the host material and energy transfer. Additionally, an intermolecular charge-transfer (CT) emission with pronounced TADF characteristics is observed between P1 and 2,4,6-tris[3-(diphenylphosphinyl)phenyl]-1,3,5-triazine (PO-T2T), with a singlet-triplet splitting of 7 meV. It is noted that the contribution of harvested triplets in monochrome organic light-emitting diodes (OLEDs) correlates with ΦDF. For devices based on intermolecular CT-emission, the harvested triplets contribute ~90% to the internal quantum efficiency. The results demonstrate the vital importance of host materials on improving the PLQY and sensitizing ΦDF of TADF polymers for efficient devices. Solution-processed polychrome OLEDs with a color close to a white emission are presented, with the emission of intramolecular (P1) and intermolecular TADF (PO-T2T:P1).
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Affiliation(s)
- Yungui Li
- Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP), Institute for Applied Physics, Technische Universität Dresden, Dresden, Germany
| | - Qiang Wei
- Ningbo Institute of Materials Technology & Engineering, Chinese Academy Sciences, Ningbo, China
| | - Liang Cao
- Ningbo Institute of Materials Technology & Engineering, Chinese Academy Sciences, Ningbo, China.,Key Laboratory of Advanced Textile Materials and Manufacturing Technology, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou, China
| | - Felix Fries
- Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP), Institute for Applied Physics, Technische Universität Dresden, Dresden, Germany
| | - Matteo Cucchi
- Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP), Institute for Applied Physics, Technische Universität Dresden, Dresden, Germany
| | - Zhongbin Wu
- Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP), Institute for Applied Physics, Technische Universität Dresden, Dresden, Germany
| | - Reinhard Scholz
- Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP), Institute for Applied Physics, Technische Universität Dresden, Dresden, Germany
| | - Simone Lenk
- Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP), Institute for Applied Physics, Technische Universität Dresden, Dresden, Germany
| | - Brigitte Voit
- Leibniz-Institut für Polymerforschung Dresden e.V, Dresden, Germany.,Organic Chemistry of Polymers, Technische Universität Dresden, Dresden, Germany
| | - Ziyi Ge
- Ningbo Institute of Materials Technology & Engineering, Chinese Academy Sciences, Ningbo, China
| | - Sebastian Reineke
- Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP), Institute for Applied Physics, Technische Universität Dresden, Dresden, Germany
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36
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Kumar M, Pereira L. Effect of the Host on Deep-Blue Organic Light-Emitting Diodes Based on a TADF Emitter for Roll-Off Suppressing. NANOMATERIALS 2019; 9:nano9091307. [PMID: 31547428 PMCID: PMC6781083 DOI: 10.3390/nano9091307] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Revised: 09/05/2019] [Accepted: 09/06/2019] [Indexed: 12/18/2022]
Abstract
To achieve significant efficiency and low roll-off in thermally activated delayed fluorescence (TADF) material organic light-emitting diodes (OLEDs), it is essential to choose a host that has suitable high triplet energy (T1) and bipolar character to boost the TADF characteristics as a dopant and avoid exciton annihilation. Herein, we present the effect of different host materials on the efficiency of organic light-emitting diodes (OLEDs) based on bis[4-(3,6 dimethoxycarbazole)phenyl]sulfone (DMOC-DPS) deep-blue emitter. The devices with 10 wt.% of an emitter in different electron types of host bis[2-(diphenylphosphino) phenyl] ether oxide (DPEPO), and hole types of host 1,3-bis(N-carbazolyl)benzene (mCP), were fabricated to study the effect on device performance. The results show that an external quantum efficiency (EQE) of 4% and maximum current efficiency (ƞc) up to 5.77 cd/A with high luminescence (lmax) 8185 cd/m2 in DPEPO was achieved, compared to 2.63% EQE, ƞc 4.12 cd/A with lmax 5338 cd/m2 in mCP in a very simple device structure. As a remarkable result, the roll-off is suppressed at 1000 cd/m2, and for maximum brightness, the roll-off is less than 50%. Further general applications are discussed.
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Affiliation(s)
- Manish Kumar
- Department of Physics and i3N-Institute for Nanostructures, Nanomodulation and Nanofabrication, University of Aveiro, 3810-193 Aveiro, Portugal.
- CeNTI-Centre for Nanotechnologies and Smart Materials, R. Fernando Mesquita, 2785, 4760-034 Vila Nova de Famalicão, Portugal.
| | - Luiz Pereira
- Department of Physics and i3N-Institute for Nanostructures, Nanomodulation and Nanofabrication, University of Aveiro, 3810-193 Aveiro, Portugal.
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37
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Chen J, Tao W, Chen W, Xiao Y, Wang K, Cao C, Yu J, Li S, Geng F, Adachi C, Lee C, Zhang X. Red/Near‐Infrared Thermally Activated Delayed Fluorescence OLEDs with Near 100 % Internal Quantum Efficiency. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201906575] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Jia‐Xiong Chen
- Institute of Functional Nano & Soft Materials (FUNSOM) and Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices Soochow University Suzhou Jiangsu 215123 P. R. China
- Center of Super-Diamond and Advanced Films (COSDAF) Department of Chemistry City University of Hong Kong Hong Kong SAR P. R. China
- College of Chemistry, Chemical Engineering and Materials Science Soochow University Suzhou 215123 P. R. China
| | - Wen‐Wen Tao
- Institute of Functional Nano & Soft Materials (FUNSOM) and Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices Soochow University Suzhou Jiangsu 215123 P. R. China
| | - Wen‐Cheng Chen
- Center of Super-Diamond and Advanced Films (COSDAF) Department of Chemistry City University of Hong Kong Hong Kong SAR P. R. China
| | - Ya‐Fang Xiao
- Center of Super-Diamond and Advanced Films (COSDAF) Department of Chemistry City University of Hong Kong Hong Kong SAR P. R. China
| | - Kai Wang
- Institute of Functional Nano & Soft Materials (FUNSOM) and Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices Soochow University Suzhou Jiangsu 215123 P. R. China
| | - Chen Cao
- Center of Super-Diamond and Advanced Films (COSDAF) Department of Chemistry City University of Hong Kong Hong Kong SAR P. R. China
| | - Jia Yu
- Institute of Functional Nano & Soft Materials (FUNSOM) and Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices Soochow University Suzhou Jiangsu 215123 P. R. China
| | - Shengliang Li
- Center of Super-Diamond and Advanced Films (COSDAF) Department of Chemistry City University of Hong Kong Hong Kong SAR P. R. China
| | - Feng‐Xia Geng
- College of Chemistry, Chemical Engineering and Materials Science Soochow University Suzhou 215123 P. R. China
| | - Chihaya Adachi
- Department of Applied Chemistry Center for Organic Photonics and Electronics Research (OPERA) Kyushu University 744 Motooka, Nishi Fukuoka 819-0395 Japan
| | - Chun‐Sing Lee
- Center of Super-Diamond and Advanced Films (COSDAF) Department of Chemistry City University of Hong Kong Hong Kong SAR P. R. China
| | - Xiao‐Hong Zhang
- Institute of Functional Nano & Soft Materials (FUNSOM) and Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices Soochow University Suzhou Jiangsu 215123 P. R. China
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38
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Chen JX, Tao WW, Chen WC, Xiao YF, Wang K, Cao C, Yu J, Li S, Geng FX, Adachi C, Lee CS, Zhang XH. Red/Near-Infrared Thermally Activated Delayed Fluorescence OLEDs with Near 100 % Internal Quantum Efficiency. Angew Chem Int Ed Engl 2019; 58:14660-14665. [PMID: 31313424 DOI: 10.1002/anie.201906575] [Citation(s) in RCA: 171] [Impact Index Per Article: 34.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2019] [Indexed: 12/17/2022]
Abstract
Developing red thermally activated delayed fluorescence (TADF) emitters, attainable for both high-efficient red organic light-emitting diodes (OLEDs) and non-doped deep red/near-infrared (NIR) OLEDs, is challenging. Now, two red emitters, BPPZ-PXZ and mDPBPZ-PXZ, with twisted donor-acceptor structures were designed and synthesized to study molecular design strategies of high-efficiency red TADF emitters. BPPZ-PXZ employs the strictest molecular restrictions to suppress energy loss and realizes red emission with a photoluminescence quantum yield (ΦPL ) of 100±0.8 % and external quantum efficiency (EQE) of 25.2 % in a doped OLED. Its non-doped OLED has an EQE of 2.5 % owing to unavoidable intermolecular π-π interactions. mDPBPZ-PXZ releases two pyridine substituents from its fused acceptor moiety. Although mDPBPZ-PXZ realizes a lower EQE of 21.7 % in the doped OLED, its non-doped device shows a superior EQE of 5.2 % with a deep red/NIR emission at peak of 680 nm.
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Affiliation(s)
- Jia-Xiong Chen
- Institute of Functional Nano & Soft Materials (FUNSOM) and Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, Jiangsu, 215123, P. R. China.,Center of Super-Diamond and Advanced Films (COSDAF), Department of Chemistry, City University of Hong Kong, Hong Kong SAR, P. R. China.,College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, P. R. China
| | - Wen-Wen Tao
- Institute of Functional Nano & Soft Materials (FUNSOM) and Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, Jiangsu, 215123, P. R. China
| | - Wen-Cheng Chen
- Center of Super-Diamond and Advanced Films (COSDAF), Department of Chemistry, City University of Hong Kong, Hong Kong SAR, P. R. China
| | - Ya-Fang Xiao
- Center of Super-Diamond and Advanced Films (COSDAF), Department of Chemistry, City University of Hong Kong, Hong Kong SAR, P. R. China
| | - Kai Wang
- Institute of Functional Nano & Soft Materials (FUNSOM) and Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, Jiangsu, 215123, P. R. China
| | - Chen Cao
- Center of Super-Diamond and Advanced Films (COSDAF), Department of Chemistry, City University of Hong Kong, Hong Kong SAR, P. R. China
| | - Jia Yu
- Institute of Functional Nano & Soft Materials (FUNSOM) and Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, Jiangsu, 215123, P. R. China
| | - Shengliang Li
- Center of Super-Diamond and Advanced Films (COSDAF), Department of Chemistry, City University of Hong Kong, Hong Kong SAR, P. R. China
| | - Feng-Xia Geng
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, P. R. China
| | - Chihaya Adachi
- Department of Applied Chemistry, Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka, 819-0395, Japan
| | - Chun-Sing Lee
- Center of Super-Diamond and Advanced Films (COSDAF), Department of Chemistry, City University of Hong Kong, Hong Kong SAR, P. R. China
| | - Xiao-Hong Zhang
- Institute of Functional Nano & Soft Materials (FUNSOM) and Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, Jiangsu, 215123, P. R. China
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39
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Zhong D, Yu Y, Song D, Yang X, Zhang Y, Chen X, Zhou G, Wu Z. Organic Emitters with a Rigid 9-Phenyl-9-phosphafluorene Oxide Moiety as the Acceptor and Their Thermally Activated Delayed Fluorescence Behavior. ACS APPLIED MATERIALS & INTERFACES 2019; 11:27112-27124. [PMID: 31271029 DOI: 10.1021/acsami.9b05950] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
With the 9-phenyl-9-phosphafluorene oxide (PhFlOP) moiety as the acceptor (A) and various donors (D), a series of new organic emitters have been synthesized with a D-A-D configuration. Their photophysical and electrochemical behaviors and electroluminescent (EL) performances have been characterized in detail. The photophysical results have indicated that the PhFlOP-based emitters with acridyl, phenoxazyl, and phenothiazyl as donors show efficient, thermally activated delayed fluorescence (TADF) behavior, especially for the TADF emitter with the phenoxazyl donor possessing an exceptionally high rate constant of reverse intersystem crossing (kRISC) of 6.2 × 105 s-1. It has also been found that their TADF behavior can be greatly affected by the substitution position of the donors. Different from the reported aryl phosphine oxide (APO) acceptors in TADF emitters, the PhFlOP moiety adopts a highly rigid configuration to guarantee a photoluminescent quantum yield as high as 0.80 in the 4,4'-N,N'-dicarbazolebiphenyl film, representing the top-ranking emission ability for the TADF emitters with APO-type acceptors. Benefitting from their advanced TADF performances, the doped organic light-emitting diodes/devices based on these PhFlOP-based TADF emitters can achieve exceptional EL performances with the maximum external quantum efficiency (ηext) of 23.3%, current efficiency (ηL) of 83.7 cd A-1, and power efficiency (ηP) of 59.1 lm W-1. These encouraging EL data show the great potential of the PhFlOP moiety in developing highly efficient TADF emitters.
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Affiliation(s)
| | - Yue Yu
- School of Physics and Optoelectronic Engineering , Xidian University , Xi'an 710071 , P. R. China
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40
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Gao F, Du R, Han C, Zhang J, Wei Y, Lu G, Xu H. High-efficiency blue thermally activated delayed fluorescence from donor-acceptor-donor systems via the through-space conjugation effect. Chem Sci 2019; 10:5556-5567. [PMID: 31293740 PMCID: PMC6553033 DOI: 10.1039/c9sc01240k] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Accepted: 04/25/2019] [Indexed: 12/11/2022] Open
Abstract
Highly efficient sky-blue TADF donor–acceptor–donor molecules were demonstrated, in which 5,10-diphenyl-5,10-dihydrophosphanthrene oxide (DPDPO2A) with the feature of homoconjugation was used as the acceptor to bridge four carbazolyl or 3,6-di-t-butyl-carbazolyl groups.
The photophysical optimization of donor (D)–acceptor (A) molecules is a real challenge because of the intrinsic limitation of their charger transfer (CT) excited states. Herein, two D–A–D molecules featuring blue thermally activated delayed fluorescence (TADF) are developed, in which a homoconjugated acceptor 5,10-diphenyl-5,10-dihydrophosphanthrene oxide (DPDPO2A) is incorporated to bridge four carbazolyl or 3,6-di-t-butyl-carbazolyl groups for D–A interaction optimization without immoderate conjugation extension. It is shown that the through-space conjugation effect of DPDPO2A can efficiently enhance intramolecular CT (ICT) and simultaneously facilitate the uniform dispersion of the frontier molecular orbitals (FMO), which remarkably reduces the singlet–triplet splitting energy (ΔEST) and increases FMO overlaps for radiation facilitation, resulting in the 4–6 fold increased rate constants of reverse intersystem crossing (RISC) and singlet radiation. The maximum external quantum efficiency beyond 20% and the state-of-the-art efficiency stability from sky-blue TADF OLEDs demonstrate the effectiveness of the “conjugation modulation” strategy for developing high-performance optoelectronic D–A systems.
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Affiliation(s)
- Feifei Gao
- Key Laboratory of Functional Inorganic Material Chemistry , Ministry of Education & School of Chemistry and Material Science , Heilongjiang University , 74 Xuefu Road , Harbin 150080 , People's Republic of China . ;
| | - Ruiming Du
- Key Laboratory of Functional Inorganic Material Chemistry , Ministry of Education & School of Chemistry and Material Science , Heilongjiang University , 74 Xuefu Road , Harbin 150080 , People's Republic of China . ;
| | - Chunmiao Han
- Key Laboratory of Functional Inorganic Material Chemistry , Ministry of Education & School of Chemistry and Material Science , Heilongjiang University , 74 Xuefu Road , Harbin 150080 , People's Republic of China . ;
| | - Jing Zhang
- Key Laboratory of Functional Inorganic Material Chemistry , Ministry of Education & School of Chemistry and Material Science , Heilongjiang University , 74 Xuefu Road , Harbin 150080 , People's Republic of China . ;
| | - Ying Wei
- Key Laboratory of Functional Inorganic Material Chemistry , Ministry of Education & School of Chemistry and Material Science , Heilongjiang University , 74 Xuefu Road , Harbin 150080 , People's Republic of China . ;
| | - Guang Lu
- Key Laboratory of Functional Inorganic Material Chemistry , Ministry of Education & School of Chemistry and Material Science , Heilongjiang University , 74 Xuefu Road , Harbin 150080 , People's Republic of China . ;
| | - Hui Xu
- Key Laboratory of Functional Inorganic Material Chemistry , Ministry of Education & School of Chemistry and Material Science , Heilongjiang University , 74 Xuefu Road , Harbin 150080 , People's Republic of China . ;
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41
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Liu J, Hu T, Li Z, Wei X, Hu X, Gao H, Liu G, Yi Y, Yamada-Takamura Y, Lee CS, Wang P, Wang Y. Intermolecular Interaction-Induced Thermally Activated Delayed Fluorescence Based on a Thiochromone Derivative. J Phys Chem Lett 2019; 10:1888-1893. [PMID: 30939025 DOI: 10.1021/acs.jpclett.9b00512] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Exploration of new extrinsic ways to modulate thermally activated delayed fluorescence (TADF) to achieve high exciton utilization efficiency in organic light-emitting diodes (OLEDs) is highly desirable. A new thiochromone derivative 2,3-bis(4-(9 H-carbazol-9-yl)phenyl)-4 H-thiochromen-4-1,1-dioxide (THI-PhCz) with tunable photophysical properties from crystals to amorphous states is reported. THI-PhCz shows molecular-packing-dependent TADF in different aggregation states based on the differences of intermolecular interactions. Furthermore, it is observed that THI-PhCz doped in amorphous films of different hosts also shows host-dependent TADF with a short delay lifetime (108 ns), which is interpreted as the effect of host-guest intermolecular interaction on the 3CT state except for the effect on the 1CT state in reported references. This work provides a new perspective for generation of TADF by tuning intermolecular interactions in crystals and amorphous films except for molecular design, which is expected to contribute in achieving low-efficiency roll-off OLEDs with effective exciton utilization efficiency.
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Affiliation(s)
- Jianjun Liu
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials and CityU-CAS Joint Laboratory of Functional Materials and Devices , Technical Institute of Physics and Chemistry, Chinese Academy of Sciences , Beijing 100190 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Taiping Hu
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids , Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190 , China
| | - Zhiyi Li
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials and CityU-CAS Joint Laboratory of Functional Materials and Devices , Technical Institute of Physics and Chemistry, Chinese Academy of Sciences , Beijing 100190 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Xiaofang Wei
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials and CityU-CAS Joint Laboratory of Functional Materials and Devices , Technical Institute of Physics and Chemistry, Chinese Academy of Sciences , Beijing 100190 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Xiaoxiao Hu
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials and CityU-CAS Joint Laboratory of Functional Materials and Devices , Technical Institute of Physics and Chemistry, Chinese Academy of Sciences , Beijing 100190 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Honglei Gao
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials and CityU-CAS Joint Laboratory of Functional Materials and Devices , Technical Institute of Physics and Chemistry, Chinese Academy of Sciences , Beijing 100190 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Guanhao Liu
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials and CityU-CAS Joint Laboratory of Functional Materials and Devices , Technical Institute of Physics and Chemistry, Chinese Academy of Sciences , Beijing 100190 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Yuanping Yi
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids , Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190 , China
| | - Yukiko Yamada-Takamura
- School of Materials Science , Japan Advanced Institute of Science and Technology , Ishikawa 923-1292 , Japan
| | - Chun-Sing Lee
- Center of Super-Diamond and Advanced Films (COSDAF) , City University of Hong Kong , Hong Kong SAR , People's Republic of China
| | - Pengfei Wang
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials and CityU-CAS Joint Laboratory of Functional Materials and Devices , Technical Institute of Physics and Chemistry, Chinese Academy of Sciences , Beijing 100190 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Ying Wang
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials and CityU-CAS Joint Laboratory of Functional Materials and Devices , Technical Institute of Physics and Chemistry, Chinese Academy of Sciences , Beijing 100190 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
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42
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Li Z, Li C, Xu Y, Xie N, Jiao X, Wang Y. Nonsymmetrical Connection of Two Identical Building Blocks: Constructing Donor-Acceptor Molecules as Deep Blue Emitting Materials for Efficient Organic Emitting Diodes. J Phys Chem Lett 2019; 10:842-847. [PMID: 30734562 DOI: 10.1021/acs.jpclett.9b00300] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We propose a strategy to construct deep blue emission molecules based on the concept of nonsymmetrical connection of two identical π-conjugated groups. It was demonstrated that the nonsymmetrical connection strategy indeed resulted in the separation of the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) and the formation of a donor-acceptor (D-A) structure. For D-A molecules constructed by two identical groups, the degree of charge transfer is weaker and deep blue emission is easily achieved. Two D-A molecules (PIpPI and PImPI) were synthesized by employing diphenyl-phenanthroimidazole (PI) as a building block. The nonsymmetric connection of PI groups endows these molecules with a D-A feature that can result in a bipolar transport property. The nondoped organic light-emitting diodes with PIpPI and PImPI as emitter exhibit deep-blue emission and maximum external quantum efficiencies of 8.84% and 6.83%, respectively.
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Affiliation(s)
- Zhiqiang Li
- State Key Laboratory of Supramolecular Structure and Materials , Jilin University , Changchun 130012 , P. R. China
| | - Chenglong Li
- State Key Laboratory of Supramolecular Structure and Materials , Jilin University , Changchun 130012 , P. R. China
| | - Yincai Xu
- State Key Laboratory of Supramolecular Structure and Materials , Jilin University , Changchun 130012 , P. R. China
| | - Ning Xie
- State Key Laboratory of Supramolecular Structure and Materials , Jilin University , Changchun 130012 , P. R. China
| | - Xuechen Jiao
- Department of Materials Science and Engineering , Monash University , Australian Synchrotron, Clayton 3800 , Victoria , Australia
| | - Yue Wang
- State Key Laboratory of Supramolecular Structure and Materials , Jilin University , Changchun 130012 , P. R. China
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Wang Q, Zhang YX, Yuan Y, Hu Y, Tian QS, Jiang ZQ, Liao LS. Alleviating Efficiency Roll-Off of Hybrid Single-Emitting Layer WOLED Utilizing Bipolar TADF Material as Host and Emitter. ACS APPLIED MATERIALS & INTERFACES 2019; 11:2197-2204. [PMID: 30565918 DOI: 10.1021/acsami.8b18665] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Hybrid single-emitting layer (SEML) white organic light-emitting diodes (WOLEDs) incorporating blue thermally activated delayed fluorescent (TADF) or fluorescent materials and yellow phosphors have been widely utilized for solid-state lighting. Nonetheless, developing appropriate host materials to reduce the large efficiency roll-off at high luminance is still an unsolved issue. Here, two TADF materials denoted as TRZ-CF and TRZ-CzF were synthesized, with electroluminescent emission peaking at 476 and 460 nm, respectively. In particular, TRZ-CF, using 7,7-dimethyl-5,7-dihydroindeno[2,1- b]carbazole (CF) as donor moiety, maintained both highly efficient blue emission (EQEmax = 20.0%) and excellent charge transport abilities. The WOLED utilizing TRZ-CF as host material, doped by 0.8 wt % iridium(III) bis(4-phenylthieno[3,2- c]pyridinato- N, C2') (PO-01), has EQEmax of 20.3%, realizing the lowest roll-off to date of less than 2% at a luminance of 10 000 cd/m2. The efficiency roll-off is alleviated through the reduction the exciton quenching and triplet-triplet annihilation (TTA) within the light-emitting layer, benefited from the TADF effect and bipolar property. The hybrid SEML WOLED exhibits Commission Internationale de L'Eclairage (CIE) coordinates of (0.38, 0.45), providing a practical way to simplify the production complexity and to reduce efficiency roll-off for solid-state lighting.
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Affiliation(s)
- Qiang Wang
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices , Soochow University , 199 Ren'ai Road , Suzhou , Jiangsu 215123 , P. R. China
| | - Ye-Xin Zhang
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices , Soochow University , 199 Ren'ai Road , Suzhou , Jiangsu 215123 , P. R. China
| | - Yi Yuan
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices , Soochow University , 199 Ren'ai Road , Suzhou , Jiangsu 215123 , P. R. China
| | - Yun Hu
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices , Soochow University , 199 Ren'ai Road , Suzhou , Jiangsu 215123 , P. R. China
| | - Qi-Sheng Tian
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices , Soochow University , 199 Ren'ai Road , Suzhou , Jiangsu 215123 , P. R. China
| | - Zuo-Quan Jiang
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices , Soochow University , 199 Ren'ai Road , Suzhou , Jiangsu 215123 , P. R. China
| | - Liang-Sheng Liao
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices , Soochow University , 199 Ren'ai Road , Suzhou , Jiangsu 215123 , P. R. China
- Institute of Organic Optoelectronics Jiangsu Industrial Technology Research Institute (JITRI) , Wujiang, Suzhou , Jiangsu 215211 , P. R. China
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45
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Yuan J, Jin L, Chen R, Tang X, Xie X, Tang Y, Huang W. Eaton's reagent assisted aromatic C–C coupling of carbazoles for optoelectronic applications. NEW J CHEM 2018. [DOI: 10.1039/c8nj03296c] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Bicarbazoles can be facilely synthesized by Eaton's reagent assisted C–C coupling via the Scholl reaction mechanism without using solvents and catalysts.
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Affiliation(s)
- Jie Yuan
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors
- Institute of Advanced Materials (IAM)
- Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM)
- Nanjing University of Posts & Telecommunications
- Nanjing 210023
| | - Lu Jin
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors
- Institute of Advanced Materials (IAM)
- Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM)
- Nanjing University of Posts & Telecommunications
- Nanjing 210023
| | - Runfeng Chen
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors
- Institute of Advanced Materials (IAM)
- Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM)
- Nanjing University of Posts & Telecommunications
- Nanjing 210023
| | - Xingxing Tang
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors
- Institute of Advanced Materials (IAM)
- Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM)
- Nanjing University of Posts & Telecommunications
- Nanjing 210023
| | - Xiang Xie
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors
- Institute of Advanced Materials (IAM)
- Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM)
- Nanjing University of Posts & Telecommunications
- Nanjing 210023
| | - Yuting Tang
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors
- Institute of Advanced Materials (IAM)
- Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM)
- Nanjing University of Posts & Telecommunications
- Nanjing 210023
| | - Wei Huang
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors
- Institute of Advanced Materials (IAM)
- Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM)
- Nanjing University of Posts & Telecommunications
- Nanjing 210023
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