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Zhang K, Cai L, Fan J, Song Y, Lin L, Wang CK, Li J. Conformational Isomerization Effect on Singlet/Triplet Energy Consumption Process of Thermally Activated Delayed Fluorescence Molecules with Aggregation Induced Emission: A QM/MM Study. J Phys Chem Lett 2024; 15:2436-2446. [PMID: 38394771 DOI: 10.1021/acs.jpclett.4c00151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2024]
Abstract
Thermally activated delayed fluorescence (TADF) molecules with aggregation-induced emission (AIE) properties hold tremendous potential in biomedical sensing/imaging and telecommunications. In this study, a multiscale method combined with thermal vibration correlation function (TVCF) theory is used to investigate the photophysical properties of the novel TADF molecule CNPy-SPAC in toluene and crystal and amorphous states. In the crystal state, an increase in radiative rates and a decrease in nonradiative rates lead to AIE. Additionally, conformational isomerization effects result in significantly different luminescent efficiencies between the two crystal structures. Furthermore, the isomerization effect allows for the coexistence of three configurations in the amorphous state. Among them, the non-TADF quasi-axial (Qa) configuration may facilitate energy transfer to the TADF-characteristic quasi-equal/quasi-equal-H (Qe/Qe-H) configurations, enhancing AIE. Moreover, the Qa configuration enables rapid electron transport, offering the potential for self-doped devices. Our work elucidates a new mechanism for the isomerization effect in AIE-TADF molecules.
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Affiliation(s)
- Kai Zhang
- School of Physics and Physical Engineering, Qufu Normal University, Qufu 273165, China
| | - Lei Cai
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, 250014 Jinan, China
| | - Jianzhong Fan
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, 250014 Jinan, China
| | - Yuzhi Song
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, 250014 Jinan, China
| | - Lili Lin
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, 250014 Jinan, China
| | - Chuan-Kui Wang
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, 250014 Jinan, China
| | - Jing Li
- School of Physics and Physical Engineering, Qufu Normal University, Qufu 273165, China
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2
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Liu X, Shao H, Li N, Jin M, Li D, Dong X, Zhang H. Electrospun green-emitting La 2O 2CO 3:Tb 3+ nanofibers and La 2O 2CO 3:Tb 3+/Eu 3+ nanofibers with white-light emission and color-tuned photoluminescence. J Colloid Interface Sci 2023; 646:711-720. [PMID: 37229989 DOI: 10.1016/j.jcis.2023.05.116] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Revised: 05/03/2023] [Accepted: 05/17/2023] [Indexed: 05/27/2023]
Abstract
Color-tuned luminescence and white-light emission materials have attracted much attention owing to their broad application prospects. Generally, Tb3+ and Eu3+ co-doped phosphors have color-tuned luminescence, but white-light emission is rarely achieved. In this work, color-tunable photoluminescence and white light emission are achieved in Tb3+ and Tb3+/Eu3+ doped monoclinic-phase La2O2CO3 one-dimensional (1D) nanofibers synthesized by electrospinning united with succedent strictly controlling calcination procedure. The prepared samples own excellent fibrous morphology. La2O2CO3:Tb3+ nanofibers are the superior green-emitting phosphors. To obtain 1D nanomaterials with color-tunable fluorescence, particularly those with white-light emission, Eu3+ ions are further selected and doped into La2O2CO3:Tb3+ nanofibers to obtain La2O2CO3:Tb3+/Eu3+ 1D nanofibers. The major emission peaks of La2O2CO3:Tb3+/Eu3+ nanofibers at 487, 543, 596 and 616 nm are attributed to 5D4→7F6 (Tb3+), 5D4→7F5 (Tb3+), 5D0→7F1 (Eu3+) and 5D0→7F2 (Eu3+) energy levels transitions under 250-nm (for Tb3+ doping) and 274-nm (for Eu3+ doping) UV light excitation, respectively. At different wavelengths excitation, La2O2CO3:Tb3+/Eu3+ nanofibers with excellent stability achieve color-tuned fluorescence and white-light emission with the help of energy transfer from Tb3+ to Eu3+ and tuning the doping concentration of Eu3+ ions. Formative mechanism and fabrication technique of La2O2CO3:Tb3+/Eu3+ nanofibers are advanced. The design concept and manufacturing technique developed in this work may offer fresh insights for synthesizing other 1D nanofibers doped with rare earth ions to tune emitting fluorescent colors.
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Affiliation(s)
- Xiaohan Liu
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China; Key Laboratory of Applied Chemistry and Nanotechnology at Universities of Jilin Province, Changchun University of Science and Technology, Changchun 130022, China
| | - Hong Shao
- Key Laboratory of Applied Chemistry and Nanotechnology at Universities of Jilin Province, Changchun University of Science and Technology, Changchun 130022, China
| | - Ning Li
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China; Key Laboratory of Applied Chemistry and Nanotechnology at Universities of Jilin Province, Changchun University of Science and Technology, Changchun 130022, China
| | - Min Jin
- Key Laboratory of Applied Chemistry and Nanotechnology at Universities of Jilin Province, Changchun University of Science and Technology, Changchun 130022, China
| | - Dan Li
- Key Laboratory of Applied Chemistry and Nanotechnology at Universities of Jilin Province, Changchun University of Science and Technology, Changchun 130022, China
| | - Xiangting Dong
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China; Key Laboratory of Applied Chemistry and Nanotechnology at Universities of Jilin Province, Changchun University of Science and Technology, Changchun 130022, China.
| | - Hongbo Zhang
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China; Key Laboratory of Applied Chemistry and Nanotechnology at Universities of Jilin Province, Changchun University of Science and Technology, Changchun 130022, China.
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3
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Li X, Wang X, Zhang Q, Wu Z, Zhang K, Song Y, Fan J, Wang CK, Lin L. Theoretical study on thermally activated delayed fluorescent molecules based on space charge transfer. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 288:122131. [PMID: 36455466 DOI: 10.1016/j.saa.2022.122131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2022] [Revised: 10/13/2022] [Accepted: 11/16/2022] [Indexed: 06/17/2023]
Abstract
Thermally Activated Delayed Fluorescent (TADF) molecules with through-space charge transfer (TSCT) have broad application potential in organic light-emitting diodes. In this paper, five TPA-ace based molecules with different electron-withdrawing groups and TSCT property are investigated using polarizable continuum model (PCM) combined with density functional theory (DFT) and time-dependent functional theory (TD-DFT) in Methylcyclohexane, Toluene and Dichloromethane. It is found that stronger electron-withdrawing ability of acceptors could induce redshift of emission and smaller energy gap between the first singlet excited state (S1) and the first triplet excited state (ΔEST). The ratio of TSCT to through bond charge transfer (TBCT) for S1 of TPA-ace-TRZ is calculated quantitatively, which further confirmed the TSCT character of TPA-ace-TRZ. The TADF property is also analyzed based on the calculation of spin-orbit coupling and the (reverse) intersystem crossing rates between S1 and T1. Our calculation results would favor the understanding of TSCT-TADF.
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Affiliation(s)
- Xiaofang Li
- Shandong Key Laboratory of Medical Physics and Image Processing & Manipulations, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China
| | - Xiaofei Wang
- Shandong Key Laboratory of Medical Physics and Image Processing & Manipulations, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China
| | - Qun Zhang
- Shandong Key Laboratory of Medical Physics and Image Processing & Manipulations, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China
| | - Zhimin Wu
- Shandong Key Laboratory of Medical Physics and Image Processing & Manipulations, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China
| | - Kai Zhang
- Shandong Key Laboratory of Medical Physics and Image Processing & Manipulations, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China
| | - Yuzhi Song
- Shandong Key Laboratory of Medical Physics and Image Processing & Manipulations, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China
| | - Jianzhong Fan
- Shandong Key Laboratory of Medical Physics and Image Processing & Manipulations, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China
| | - Chuan-Kui Wang
- Shandong Key Laboratory of Medical Physics and Image Processing & Manipulations, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China.
| | - Lili Lin
- Shandong Key Laboratory of Medical Physics and Image Processing & Manipulations, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China.
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4
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Zhang C, Cheng J, Wu Q, Hou S, Feng S, Jiang B, Lambert CJ, Gao X, Li Y, Li J. Enhanced π-π Stacking between Dipole-Bearing Single Molecules Revealed by Conductance Measurement. J Am Chem Soc 2023; 145:1617-1630. [PMID: 36625785 DOI: 10.1021/jacs.2c09656] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Dipoles are widely involved in π-π interactions and are central to many chemical and biological functions, but their influence on the strength of π-π interactions remains unclear. Here, we report a study of π-π interaction between azulene-based, polar single molecules and between naphthalene-based, nonpolar single molecules. By performing scanning tunneling microscopy break junction measurements of single-molecule conductance, we show that the π-stacked dimers formed by the azulene-based, polar aromatic structures feature higher electrical conductivity and mechanical stability than those formed by the naphthalene-based, nonpolar molecules. Mechanical control of π-π interactions in both rotational and translational motion reveals a sensitive dependence of the stacking strength on relative alignment between the dipoles. The antiparallel alignment of the dipoles was found to be the optimal stacking configuration that underpins the observed enhancement of π-π stacking between azulene-based single molecules. Density functional theory calculations further explained the observed enhancement of stacking strength and the corresponding charge transport efficiency. Our experimental and theoretical results show that the antiparallel alignment of the dipole moments significantly enhances the electronic coupling and mechanical stability of π-π stacking. In addition, in the formation of single-molecule junctions, the azulene group was experimentally and theoretically proved to form a Au-π contact with electrodes with high charge transport efficiency. This paper provides evidence and interpretation of the role of dipoles in π-π interactions at the single-molecule level and offers new insights into potential applications in supramolecular devices.
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Affiliation(s)
- Chengyang Zhang
- Center for Bioanalytical Chemistry, University of Science and Technology of China, Hefei230026, China
| | - Jie Cheng
- Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai200032, China
| | - Qingqing Wu
- Department of Physics, Lancaster University, LancasterLA1 4YB, U.K
| | - Songjun Hou
- Department of Physics, Lancaster University, LancasterLA1 4YB, U.K
| | - Sai Feng
- Center for Bioanalytical Chemistry, University of Science and Technology of China, Hefei230026, China
| | - Bo Jiang
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing210023, China
| | - Colin J Lambert
- Department of Physics, Lancaster University, LancasterLA1 4YB, U.K
| | - Xike Gao
- Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai200032, China
| | - Yueqi Li
- Center for Bioanalytical Chemistry, University of Science and Technology of China, Hefei230026, China
| | - Jinghong Li
- Center for Bioanalytical Chemistry, University of Science and Technology of China, Hefei230026, China.,Department of Chemistry, Key Lab of Bioorganic Phosphorus Chemistry and Chemical Biology, Tsinghua University, Beijing100084, China
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5
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Combined experimental and TD-DFT/DMOl 3 investigations, optical properties, and photoluminescence behavior of a thiazolopyrimidine derivative. Sci Rep 2022; 12:15674. [PMID: 36123356 PMCID: PMC9485139 DOI: 10.1038/s41598-022-19840-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2022] [Accepted: 09/05/2022] [Indexed: 02/05/2023] Open
Abstract
We present here the FT-IR, DFT computation, XRD, optical, and photophysical characterization of a heterocyclic compound with thienopyrimidine and pyran moieties. TD-DFT/DMOl3 and TD-DFT/CASTEP computations were used to study the geometry of isolated and dimer molecules and their optical behavior. The indirect (3.93 eV) and direct (3.29 eV) optical energy bandgaps, HOMO-LUMO energy gap (3.02 eV), and wavelength of maximum absorption (353 nm) were determined in the gas phase with M062X/6-31+G (d, p). A thin film of the studied molecule was studied using XRD, FT-IR, and UV-Vis spectroscopy. The average crystallite size was found as 74.95 nm. Also, the photoluminescence spectroscopy revealed that the compound exhibited different emission bands at the visible range with different intensities depending on the degree of molecular aggregation. For instance, solutions with different concentrations emitted blue, cyan, and green light. On the other hand, the solid-state material produced a dual emission with comparable intensities at λmax = 455, 505, and 621 nm to cover the entire visible range and produce white emission from a single material with CIE coordinates of (0.34, 0.32) that are very similar to the ideal pure white light. Consequently, these findings could lead to the development of more attractive new luminous materials.
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6
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Zhang K, Zhang X, Fan J, Song Y, Fan J, Wang CK, Lin L. Novel Deep Red Thermally Activated Delayed Fluorescence Molecule with Aggregation-Induced Emission Enhancement: Theoretical Design and Experimental Validation. J Phys Chem Lett 2022; 13:4711-4720. [PMID: 35611873 DOI: 10.1021/acs.jpclett.2c00779] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Thermally activated delayed fluorescence (TADF) molecules with deep red luminescence have shown great applications in organic light-emitting diodes (OLEDs). However, the development of high efficient deep red TADF emitters is full of resistance, and new design strategies are highly desired. This work theoretically predicts the luminescence properties and photophysical mechanism of a spiro-acridine based molecule DBPz-2spAc in toluene and aggregation states. Experiments further show that the solid state can effectively suppress nonradiative energy loss and thus improve luminescence efficiency. OLEDs based on DBPz-2spAc show high luminescence efficiency. In addition, studies based on spiro-acridine derivatives indicate that bending the degree of acridine in excited state will directly affect the nonradiative energy loss. This study improves the understanding of the luminous behavior of spiro-acridine derivative based TADF emitters in solution and in aggregation state, which should pave the way for the design of efficient deep red TADF materials.
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Affiliation(s)
- Kai Zhang
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, 250014 Jinan, China
| | - Xiao Zhang
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, Jiangsu 215123, China
| | - Jianzhong Fan
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, 250014 Jinan, China
| | - Yuzhi Song
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, 250014 Jinan, China
| | - Jian Fan
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, Jiangsu 215123, China
| | - Chuan-Kui Wang
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, 250014 Jinan, China
| | - Lili Lin
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, 250014 Jinan, China
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7
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Li Q, Wu Y, Cao J, Liu Y, Wang Z, Zhu H, Zhang H, Huang F. Pillararene-Induced Intramolecular Through-Space Charge Transfer and Single-Molecule White-Light Emission. Angew Chem Int Ed Engl 2022; 61:e202202381. [PMID: 35234348 DOI: 10.1002/anie.202202381] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2022] [Indexed: 12/15/2022]
Abstract
The fabrication of single-molecule white-light emission (SMWLE) materials has become a highly studied topic in recent years and through-space charge transfer (TSCT) is emerging as an important concept in this field. However, the preparation of ideal TSCT-based SMWLE materials is still a big challenge. Herein, we report a bifunctional pillar[5]arene (TPCN-P5-TPA) with a linear donor-spacer-acceptor structure and aggregation-induced emission (AIE) property. The bulky pillar[5]arene between the donor and acceptor induces a twisted conformation and a non-conjugated structure, resulting in intramolecular TSCT. In addition, the AIE feature and pillar[5]arene cavity endow TPCN-P5-TPA with responsiveness to viscosity and polar guests, by which the TSCT emission is triggered. The combination of blue locally-excited state emission and yellow TSCT emission of TPCN-P5-TPA generates SMWLE. Therefore, we provide a new and versatile strategy for the construction of TSCT-based SMWLE materials.
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Affiliation(s)
- Qi Li
- State Key Laboratory of Chemical Engineering, Stoddart Institute of Molecular Science, Department of Chemistry, Zhejiang University, Hangzhou, 310027, China
| | - Yitao Wu
- State Key Laboratory of Chemical Engineering, Stoddart Institute of Molecular Science, Department of Chemistry, Zhejiang University, Hangzhou, 310027, China
| | - Jiajun Cao
- State Key Laboratory of Chemical Engineering, Stoddart Institute of Molecular Science, Department of Chemistry, Zhejiang University, Hangzhou, 310027, China
| | - Yang Liu
- State Key Laboratory of Chemical Engineering, Stoddart Institute of Molecular Science, Department of Chemistry, Zhejiang University, Hangzhou, 310027, China
| | - Zeju Wang
- State Key Laboratory of Chemical Engineering, Stoddart Institute of Molecular Science, Department of Chemistry, Zhejiang University, Hangzhou, 310027, China
| | - Huangtianzhi Zhu
- State Key Laboratory of Chemical Engineering, Stoddart Institute of Molecular Science, Department of Chemistry, Zhejiang University, Hangzhou, 310027, China
| | - Haoke Zhang
- ZJU-Hangzhou Global Scientific and Technological Innovation Center, Hangzhou, 311215, China.,MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027, China.,Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, Guangzhou, 510640, China
| | - Feihe Huang
- State Key Laboratory of Chemical Engineering, Stoddart Institute of Molecular Science, Department of Chemistry, Zhejiang University, Hangzhou, 310027, China.,ZJU-Hangzhou Global Scientific and Technological Innovation Center, Hangzhou, 311215, China.,Green Catalysis Center and College of Chemistry, Zhengzhou University, Zhengzhou, 450001, China
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8
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Li Q, Wu Y, Cao J, Liu Y, Wang Z, Zhu H, Zhang H, Huang F. Pillararene‐Induced Intramolecular Through‐Space Charge Transfer and Single‐Molecule White‐Light Emission. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202202381] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Qi Li
- State Key Laboratory of Chemical Engineering Stoddart Institute of Molecular Science Department of Chemistry Zhejiang University Hangzhou 310027 China
| | - Yitao Wu
- State Key Laboratory of Chemical Engineering Stoddart Institute of Molecular Science Department of Chemistry Zhejiang University Hangzhou 310027 China
| | - Jiajun Cao
- State Key Laboratory of Chemical Engineering Stoddart Institute of Molecular Science Department of Chemistry Zhejiang University Hangzhou 310027 China
| | - Yang Liu
- State Key Laboratory of Chemical Engineering Stoddart Institute of Molecular Science Department of Chemistry Zhejiang University Hangzhou 310027 China
| | - Zeju Wang
- State Key Laboratory of Chemical Engineering Stoddart Institute of Molecular Science Department of Chemistry Zhejiang University Hangzhou 310027 China
| | - Huangtianzhi Zhu
- State Key Laboratory of Chemical Engineering Stoddart Institute of Molecular Science Department of Chemistry Zhejiang University Hangzhou 310027 China
| | - Haoke Zhang
- ZJU-Hangzhou Global Scientific and Technological Innovation Center Hangzhou 311215 China
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China
- Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates South China University of Technology Guangzhou 510640 China
| | - Feihe Huang
- State Key Laboratory of Chemical Engineering Stoddart Institute of Molecular Science Department of Chemistry Zhejiang University Hangzhou 310027 China
- ZJU-Hangzhou Global Scientific and Technological Innovation Center Hangzhou 311215 China
- Green Catalysis Center and College of Chemistry Zhengzhou University Zhengzhou 450001 China
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9
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Ito S. Luminescent polymorphic crystals: mechanoresponsive and multicolor-emissive properties. CrystEngComm 2022. [DOI: 10.1039/d1ce01614h] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Polymorphic organic crystals that can switch their photophysical properties in response to mechanical stimuli are highlighted.
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Affiliation(s)
- Suguru Ito
- Department of Chemistry and Life Science, Graduate School of Engineering Science, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
- PRESTO, Japan Science and Technology Agency (JST), 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
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10
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Barman D, Annadhasan M, Chandrasekar R, Iyer PK. Hot-exciton harvesting via through-space single-molecule based white-light emission and optical waveguides. Chem Sci 2022; 13:9004-9015. [PMID: 36091201 PMCID: PMC9365089 DOI: 10.1039/d2sc02172b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2022] [Accepted: 07/02/2022] [Indexed: 11/21/2022] Open
Abstract
Through-space donor–alkyl bridge–acceptor (D–σ–A) luminogens are developed as new organic single-molecule white light emitters (OSMWLEs) involving multiple higher lying singlet (Sn) and triplet (Tm) states (hot-excitons). Experimental and theoretical results confirm the origin of white light emission due to the co-existence of prompt fluorescence from locally excited states, thermally activated delayed fluorescence (TADF), and fast/slow dual phosphorescence color mixing simultaneously. Notably, the fast phosphorescence was observed due to trace amounts of isomeric impurities from commercial carbazole, while H-/J-aggregation resulted in slow phosphorescence. Crystal structure-packing-property analysis revealed that the alkyl chain length induced supramolecular self-assembly greatly influenced the solid-state optical properties. Remarkably, the 1D-microrod crystals of OSMWLEs demonstrated the first examples of triplet harvesting waveguides by self-guiding the generated phosphorescence through light propagation along their longitudinal axis. This work thus highlights an uncommon design strategy to achieve multi-functional OSMWLEs with in-depth mechanistic insights and optical waveguiding applications making them a potentially new class of white emissive materials. Through-space donor–alkyl bridge–acceptor multifunctional organic single molecules that simultaneously displayed white light emission, thermally activated delayed fluorescence, room temperature dual phosphorescence and optical wave-guiding properties.![]()
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Affiliation(s)
- Debasish Barman
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India
| | - Mari Annadhasan
- School of Chemistry and Centre for Nanotechnology, University of Hyderabad, Gachibowli, Prof. C. R. Rao Road, Hyderabad-500046, India
| | - Rajadurai Chandrasekar
- School of Chemistry and Centre for Nanotechnology, University of Hyderabad, Gachibowli, Prof. C. R. Rao Road, Hyderabad-500046, India
| | - Parameswar Krishnan Iyer
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India
- Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India
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11
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Lv M, Wang X, Pan H, Chen J. Direct Observation of Ultrafast Access to a Solvent-Independent Singlet-Triplet Equilibrium State in Acridone Solutions. J Phys Chem B 2021; 125:13291-13297. [PMID: 34841879 DOI: 10.1021/acs.jpcb.1c08844] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Acridone and its derivatives have potential application as emitters for highly efficient blue organic light-emitting diodes (OLEDs). In this paper, we demonstrated ultrafast access of a solvent-independent singlet-triplet equilibrium state in acridone solutions by using femtosecond time-resolved spectroscopy. Our spectral data show that due to highly effective forward and reverse intersystem crossing (both kISC and krISC over 1010 s-1), a singlet-triplet equilibrium state is always populated in acridone in all solvents studied. However, the lifetimes of the equilibrium state varied a lot in different solvent environments and the final decay pathway of this state can switch between high quantum yield fluorescence emission and further internal conversion to the lowest triplet state. These findings provide direct experimental evidence to understand the distinct photophysical behaviors of acridone and also provide guidance for further design of acridone and its derivatives as blue OLED emitters.
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Affiliation(s)
- Meng Lv
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
| | - Xueli Wang
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
| | - Haifeng Pan
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
| | - Jinquan Chen
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China.,Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, China
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12
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Li JB, Zheng HW, Wu M, Liang QF, Yang DD, Zheng XJ, Tan HW. Multistimulus Response of Two Tautomeric Zn(II) Complexes and Their White-Light Emission Based on Different Mechanisms. Inorg Chem 2021; 60:17677-17686. [PMID: 34784208 DOI: 10.1021/acs.inorgchem.1c02286] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A triphenylamine (TPA)-based 2H-quinazoline Zn(II) complex (Q-TPA-Zn) exhibiting dual fluorescence and phosphorescence emission in the solid state was designed and prepared. It possesses mechanochromic luminescence and thermochromic luminescence properties. In the solid state, the white afterglow luminescence could be observed at 77 K (CIExy: 0.27, 0.33) while cyan luminescence could be observed at 297 K. After thermolysis at 300 °C, Q-TPA-Zn could be transformed into Schiff base complex S-TPA-Zn with white fluorescence in the powder state (CIExy: 0.32, 0.38), in methanol (CIExy: 0.32, 0.39), and in dimethylformamide (CIExy: 0.26, 0.32) at room temperature. This arises from dual emission of normal* emission and tautomeric* emission induced by excited-state intramolecular proton transfer (ESIPT) from the benzimidazole NH group to the Schiff base N atom. Q-TPA-Zn could also be transformed into its isomeric form, S-TPA-Zn, through photochemical ring-opening reaction upon irradiation under 365 nm in the solution, exhibiting high-contrast photochromic luminescence. Interestingly, S-TPA-Zn could further be transformed into its zwitterionic isomer after continuous irradiation. The same ring-opening reaction could also take place for the orgainc compound Q-TPA via heating or 365 nm irradiation. The ring-opening reaction mechanism and ESIPT emission were interpreted via theoretical calculation.
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Affiliation(s)
- Jia-Bin Li
- Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China
| | - Han-Wen Zheng
- Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China
| | - Min Wu
- Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China
| | - Qiong-Fang Liang
- Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China
| | - Dong-Dong Yang
- Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China
| | - Xiang-Jun Zheng
- Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China
| | - Hong-Wei Tan
- Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China
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13
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Yang Z, Yang K, Wei X, Liu W, Gao R, Jäkle F, Loo YL, Ren Y. A Multiple Excited-State Engineering of Boron-Functionalized Diazapentacene Via a Tuning of the Molecular Orbital Coupling. J Phys Chem Lett 2021; 12:9308-9314. [PMID: 34543025 DOI: 10.1021/acs.jpclett.1c02668] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Harvesting high-energy excited-state energy is still challenging in organic chromophores. An introduction of boron atoms along the short axis of the diazapentacene backbone induces multiple emission characteristics. Our studies reveal that the weak molecular orbital (MO) coupling of the S3-S1 transition is responsible for the slow internal conversion rates. Such MO coupling-regulated anti-Kasha emission is different from the large band gap-induced anti-Kasha emission character of classical azulene derivatives. Theoretical studies reveal that a strong MO coupling of the S3-S0 transition is responsible for the higher photoluminescence quantum yield of the anti-Kasha emission in a more polar solution (tetrahydrofuran: 11%; cyclohexane: 0%). Such an MO coupling factor is generally overlooked in anti-Kasha emitters reported previously. Furthermore, the multiple emission can be regulated by solvent polarity, solvent temperature, and fluoride anion binding. As a proof of concept of harvesting high-energy emission, the multiple emission character has allowed us to design single-molecule white-light-emitting materials.
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Affiliation(s)
- Zi Yang
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, People's Republic of China
- University of Chinese Academy of Science, Beijing100449, People's Republic of China
- Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201203, People's Republic of China
| | - Kai Yang
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, People's Republic of China
| | - Xiaofan Wei
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, People's Republic of China
| | - Weimin Liu
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, People's Republic of China
| | - Rong Gao
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, People's Republic of China
| | - Frieder Jäkle
- Department of Chemistry, Rutgers University, Newark, New Jersey 07102, United States
| | - Yueh-Lin Loo
- Department of Chemical and Biological Engineering, Princeton University, Princeton, New Jersey, 08544United States
| | - Yi Ren
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, People's Republic of China
- University of Chinese Academy of Science, Beijing100449, People's Republic of China
- Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201203, People's Republic of China
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14
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Chaaban M, Ben-Akacha A, Worku M, Lee S, Neu J, Lin X, Vellore Winfred JSR, Delzer CJ, Hayward JP, Du MH, Siegrist T, Ma B. Metal Halide Scaffolded Assemblies of Organic Molecules with Enhanced Emission and Room Temperature Phosphorescence. J Phys Chem Lett 2021; 12:8229-8236. [PMID: 34423990 DOI: 10.1021/acs.jpclett.1c02354] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Ionically bonded organic metal halide hybrids have emerged as versatile multicomponent material systems exhibiting unique and useful properties. The unlimited combinations of organic cations and metal halides lead to the tremendous structural diversity of this class of materials, which could unlock many undiscovered properties of both organic cations and metal halides. Here we report the synthesis and characterization of a series benzoquinolinium (BZQ) metal halides with a general formula (BZQ)Pb2X5 (X = Cl, Br), in which metal halides form a unique two-dimensional (2D) structure. These BZQ metal halides are found to exhibit enhanced photoluminescence and stability as compared to the pristine BZQ halides, due to the scaffolding effects of 2D metal halides. Optical characterizations and theoretical calculations reveal that BZQ+ cations are responsible for the emissions in these hybrid materials. Changing the halide from Cl to Br introduces heavy atom effects, resulting in yellow room temperature phosphorescence (RTP) from BZQ+ cations.
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Affiliation(s)
- Maya Chaaban
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Azza Ben-Akacha
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Michael Worku
- Materials Science and Engineering Program, Florida State University, Tallahassee, Florida 32306, United States
| | - Sujin Lee
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Jennifer Neu
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - Xinsong Lin
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - J S Raaj Vellore Winfred
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Cordell J Delzer
- Department of Nuclear Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Jason P Hayward
- Department of Nuclear Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Mao-Hua Du
- Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Theo Siegrist
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
- Department of Chemical and Biomedical Engineering, FAMU-FSU College of Engineering, Tallahassee, Florida 32310, United States
| | - Biwu Ma
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
- Materials Science and Engineering Program, Florida State University, Tallahassee, Florida 32306, United States
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15
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Ajantha J, Yuvaraj P, Karuppusamy M, Easwaramoorthi S. Single-Molecule White-Light-Emitting Starburst Donor-Acceptor Triphenylamine Derivatives and Their Application as Ratiometric Luminescent Molecular Thermometers. Chemistry 2021; 27:11319-11325. [PMID: 34043253 DOI: 10.1002/chem.202100748] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Indexed: 01/07/2023]
Abstract
White-light emission (WLE) from a single molecule is a highly desirable alternative to a complex mixture of complementary colour emitters, which suffers from poor stability and reproducibility for potential use in organic electronic devices and lighting applications. We report single-molecule WLE both in solution and thin films by judiciously controlled π-electron delocalisation between the triarylamine subchromophoric units. Triphenylamine (TPA) forms the central core, and the phenyl rings are substituted with the electron-deficient acceptor 3-ethylrhodanine (Rh) and electron-rich donors triphenylamine or carbazole. The enforced biphenyl configuration of the TPA core and the other donors renders the π-conjugation across the entire chromophore poor, thus the individual subchromophoric units retain their individual emission characteristics, which cover all three primary colour emissions, that is, red, green and blue (RGB). TPA-Rh units exhibit broad fluorescence in the green-red region originating from the local excited (LE) state and intramolecular charge transfer state (ICT), strongly influenced by the solvent, water, and temperature. Different fluorescence parameters, including spectral maxima, ratiometric changes in ICT emission at the expense of blue emission from terminal donor units, and changes in lifetime, have a linear relationship with temperature between 180-330 K, thus the molecules can function as a multiparameter luminescent molecular thermometer. A temperature coefficient of 0.19 K-1 in ratiometric fluorescence changes along with a spectral shift of 0.3 nm K-1 and their workability over the wide temperature makes these molecules promising materials for potential applications. At lower temperatures, individual subchromophoric properties subside because of the reduced dihedral angle of biphenyl, and fluorescence from the whole molecule becomes dominant.
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Affiliation(s)
- Joseph Ajantha
- Inorganic & Physical Chemistry Laboratory, CSIR-Central Leather Research Institute Adyar, Chennai, 600020, India
- University of Madras, Chepauk, Chennai, 600005, India
| | - Palani Yuvaraj
- Inorganic & Physical Chemistry Laboratory, CSIR-Central Leather Research Institute Adyar, Chennai, 600020, India
- University of Madras, Chepauk, Chennai, 600005, India
| | - Masiyappan Karuppusamy
- Inorganic & Physical Chemistry Laboratory, CSIR-Central Leather Research Institute Adyar, Chennai, 600020, India
- Academy of Scientific and Innovative Research (AcSIR), CSIR-CLRI Campus, Chennai, 600020, India
| | - Shanmugam Easwaramoorthi
- Inorganic & Physical Chemistry Laboratory, CSIR-Central Leather Research Institute Adyar, Chennai, 600020, India
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16
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Rajamalli P, Rizzi F, Li W, Jinks MA, Gupta AK, Laidlaw BA, Samuel IDW, Penfold TJ, Goldup SM, Zysman‐Colman E. Using the Mechanical Bond to Tune the Performance of a Thermally Activated Delayed Fluorescence Emitter*. Angew Chem Int Ed Engl 2021; 60:12066-12073. [PMID: 33666324 PMCID: PMC8251797 DOI: 10.1002/anie.202101870] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Indexed: 12/12/2022]
Abstract
We report the characterization of rotaxanes based on a carbazole-benzophenone thermally activated delayed fluorescence luminophore. We find that the mechanical bond leads to an improvement in key photophysical properties of the emitter, notably an increase in photoluminescence quantum yield and a decrease in the energy difference between singlet and triplet states, as well as fine tuning of the emission wavelength, a feat that is difficult to achieve when using covalently bound substituents. Computational simulations, supported by X-ray crystallography, suggest that this tuning of properties occurs due to weak interactions between the axle and the macrocycle that are enforced by the mechanical bond. This work highlights the benefits of using the mechanical bond to refine existing luminophores, providing a new avenue for emitter optimization that can ultimately increase the performance of these molecules.
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Affiliation(s)
- Pachaiyappan Rajamalli
- Organic Semiconductor CentreEaStCHEM School of ChemistryUniversity of St AndrewsSt AndrewsFifeKY16 9STUK
- Materials Research CentreIndian Institute of ScienceBangalore560012India
| | - Federica Rizzi
- ChemistryUniversity of SouthamptonHighfieldSouthamptonSO17 1BJUK
| | - Wenbo Li
- Organic Semiconductor CentreSUPA School of Physics and AstronomyUniversity of St AndrewsSt AndrewsFifeKY16 9SSUK
| | - Michael A. Jinks
- ChemistryUniversity of SouthamptonHighfieldSouthamptonSO17 1BJUK
| | - Abhishek Kumar Gupta
- Organic Semiconductor CentreEaStCHEM School of ChemistryUniversity of St AndrewsSt AndrewsFifeKY16 9STUK
- Organic Semiconductor CentreSUPA School of Physics and AstronomyUniversity of St AndrewsSt AndrewsFifeKY16 9SSUK
| | - Beth A. Laidlaw
- Chemistry, School of Natural and Environmental SciencesNewcastle UniversityNewcastle upon TyneNE1 7RUUK
| | - Ifor D. W. Samuel
- Organic Semiconductor CentreSUPA School of Physics and AstronomyUniversity of St AndrewsSt AndrewsFifeKY16 9SSUK
| | - Thomas J. Penfold
- Chemistry, School of Natural and Environmental SciencesNewcastle UniversityNewcastle upon TyneNE1 7RUUK
| | | | - Eli Zysman‐Colman
- Organic Semiconductor CentreEaStCHEM School of ChemistryUniversity of St AndrewsSt AndrewsFifeKY16 9STUK
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17
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Rajamalli P, Rizzi F, Li W, Jinks MA, Gupta AK, Laidlaw BA, Samuel IDW, Penfold TJ, Goldup SM, Zysman‐Colman E. Using the Mechanical Bond to Tune the Performance of a Thermally Activated Delayed Fluorescence Emitter**. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202101870] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Pachaiyappan Rajamalli
- Organic Semiconductor Centre EaStCHEM School of Chemistry University of St Andrews St Andrews Fife KY16 9ST UK
- Materials Research Centre Indian Institute of Science Bangalore 560012 India
| | - Federica Rizzi
- Chemistry University of Southampton Highfield Southampton SO17 1BJ UK
| | - Wenbo Li
- Organic Semiconductor Centre SUPA School of Physics and Astronomy University of St Andrews St Andrews Fife KY16 9SS UK
| | - Michael A. Jinks
- Chemistry University of Southampton Highfield Southampton SO17 1BJ UK
| | - Abhishek Kumar Gupta
- Organic Semiconductor Centre EaStCHEM School of Chemistry University of St Andrews St Andrews Fife KY16 9ST UK
- Organic Semiconductor Centre SUPA School of Physics and Astronomy University of St Andrews St Andrews Fife KY16 9SS UK
| | - Beth A. Laidlaw
- Chemistry, School of Natural and Environmental Sciences Newcastle University Newcastle upon Tyne NE1 7RU UK
| | - Ifor D. W. Samuel
- Organic Semiconductor Centre SUPA School of Physics and Astronomy University of St Andrews St Andrews Fife KY16 9SS UK
| | - Thomas J. Penfold
- Chemistry, School of Natural and Environmental Sciences Newcastle University Newcastle upon Tyne NE1 7RU UK
| | - Stephen M. Goldup
- Chemistry University of Southampton Highfield Southampton SO17 1BJ UK
| | - Eli Zysman‐Colman
- Organic Semiconductor Centre EaStCHEM School of Chemistry University of St Andrews St Andrews Fife KY16 9ST UK
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18
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Roy B, Reddy MC, Jose GP, Niemeyer FC, Voskuhl J, Hazra P. All in One: Stimuli-Responsive, Efficient Mitotracking, and Single Source White Light Emission. J Phys Chem Lett 2021; 12:1162-1168. [PMID: 33480695 DOI: 10.1021/acs.jpclett.0c03489] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
"All in one" type luminogens, possessing combined properties related to optical, materials, and biological implications, are of urgent demand today, mainly because of the combined application potential of such probes. To the best of our knowledge, until now, an "all in one" type white light emitter together with stimuli-responsive behavior and highly efficient mitochondrial-tracking ability has not been reported yet. In this contribution, for the first time, we have investigated a pair of luminogens exhibiting white light emission (CIE coordinates: 0.35, 0.35 (DPAEOA) and 0.29, 0.33 (DPAPMI)) with temperature-induced mechanochromic features of a centrosymmetrically packed probe (space group P-1). Most importantly, despite being neutral, our designed probe DPAEOA can specifically illuminate mitochondria with the highest Pearson coefficient value (0.93), which is rare, as almost all the commercially developed mitotrackers are cationic fluorophores. Thus, this study will pave a new avenue for the design of next generation "all in one" type organic luminogens exhibiting potential applications in notable optical, materials, and biological fields.
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Affiliation(s)
- Bibhisan Roy
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune, Maharashtra 411008, India
- Faculty of Chemistry (Organic Chemistry) and CENIDE, University of Duisburg-Essen, Universitätsstrasse 7, 45141 Essen, Germany
| | - Mallu Chenna Reddy
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune, Maharashtra 411008, India
| | - Gregor P Jose
- Department of Biological Sciences, Indian Institute of Science Education and Research (IISER), Pune, Maharashtra 411008, India
| | - Felix C Niemeyer
- Faculty of Chemistry (Organic Chemistry) and CENIDE, University of Duisburg-Essen, Universitätsstrasse 7, 45141 Essen, Germany
| | - Jens Voskuhl
- Faculty of Chemistry (Organic Chemistry) and CENIDE, University of Duisburg-Essen, Universitätsstrasse 7, 45141 Essen, Germany
| | - Partha Hazra
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune, Maharashtra 411008, India
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19
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Barboza CA, Gawrys P, Banasiewicz M, Kozankiewicz B, Sobolewski AL. Substituent effects on the photophysical properties of tris(salicylideneanilines). Phys Chem Chem Phys 2021; 23:1156-1164. [PMID: 33350404 DOI: 10.1039/d0cp04385k] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The role of electron acceptor/donor group substitution on the photophysical properties of tris(salicylideneanilines) (TSANs) was investigated. These compounds were synthesised and characterised through spectroscopic techniques including steady state absorption and emission spectroscopies. Their photochemical reaction mechanisms and properties were explored with the aid of ab initio methods of quantum chemistry. The obtained results allow us to verify the dependence of multiple emission bands on the substitution of electron donating and accepting groups to the tris(salicylideneaniline) core. The results also stress the differences in phosphorescence behaviour of TSANs for which this type of emission has not been reported so far.
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Affiliation(s)
- Cristina A Barboza
- Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, Warsaw, Poland.
| | - Pawel Gawrys
- Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, Warsaw, Poland.
| | - Marzena Banasiewicz
- Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, Warsaw, Poland.
| | - Bolesław Kozankiewicz
- Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, Warsaw, Poland.
| | - Andrzej L Sobolewski
- Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, Warsaw, Poland.
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20
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Li FZ, Zhou LL, Kuang GC. Supramolecular Engineering Strategy to Construct BODIPY-Based White Light Emission Materials. Chem Asian J 2021; 16:97-101. [PMID: 33230958 DOI: 10.1002/asia.202001297] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Revised: 11/22/2020] [Indexed: 12/18/2022]
Abstract
Two kinds of 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) dyads BDP-OH containing 4-hydroxystyrene groups and BDP-PY bearing pyridinyl units were prepared. In addition, a naphthalene derivative NAP-PY modified by pyridinyl moieties substituent was made. The above three dyads could be used to construct white-light emission (WLE) material by a supramolecular engineering strategy due to their three primary colors of blue, green and red. The supramolecular correlations between the hydroxyl group of BDP-OH and the pyridinyl groups of NAP-PY and BDP-PY were confirmed by 1 H NMR titration, 2D NOESY and FTIR. A fluorescence monitor application was carried out based on the realization of WLE. This work might be useful for designing other WLE supramolecular systems and image display.
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Affiliation(s)
- Fang-Zhou Li
- State Key Laboratory of Power Metallurgy, Department of Polymer Materials and Engineering, Central South University, Changsha, Hunan, 410083, P. R. China
| | - Liang-Liang Zhou
- State Key Laboratory of Power Metallurgy, Department of Polymer Materials and Engineering, Central South University, Changsha, Hunan, 410083, P. R. China
| | - Gui-Chao Kuang
- State Key Laboratory of Power Metallurgy, Department of Polymer Materials and Engineering, Central South University, Changsha, Hunan, 410083, P. R. China
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21
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Kukhta NA, Bryce MR. Dual emission in purely organic materials for optoelectronic applications. MATERIALS HORIZONS 2021; 8:33-55. [PMID: 34821289 DOI: 10.1039/d0mh01316a] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Purely organic molecules, which emit light by dual emissive (DE) pathways, have received increased attention in the last decade. These materials are now being utilized in practical optoelectronic, sensing and biomedical applications. In order to further extend the application of the DE emitters, it is crucial to gain a fundamental understanding of the links between the molecular structure and the underlying photophysical processes. This review categorizes the types of DE according to the spin multiplicity and time range of the emission, with emphasis on recent experimental advances. The design rules towards novel DE molecular candidates, the most perspective types of DE and possible future applications are outlined. These exciting developments highlight the opportunities for new materials synthesis and pave the way for accelerated future innovation and developments in this area.
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Affiliation(s)
- Nadzeya A Kukhta
- Department of Chemistry, Durham University, Lower Mountjoy, Stockton Road, Durham, DH1 3LE, UK.
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22
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Zhang K, Zhang Y, Ma Y, Fan J, Wang CK, Lin L. Solid-State Effect Induced Thermally Activated Delayed Fluorescence with Tunable Emission: A Multiscale Study. J Phys Chem A 2020; 124:8540-8550. [PMID: 32966069 DOI: 10.1021/acs.jpca.0c07152] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Thermally activated delayed fluorescence (TADF) molecules with tunable solid-state luminescence have shown great application potential in organic light-emitting diodes. However, theoretical studies on luminescence properties of organic emitters with consideration of solid-state effect are limited. In this work, the photophysical properties of a difluoroboron β-diketonate-based molecule (M1) in liquid, crystal, and amorphous states are studied using multiscale methods combined with the thermal vibration correlation function theory. Our results indicate that the geometric structures of M1 in liquid with toluene and crystal state are all in straight-chain form. However, M1 in amorphous state is subjected to form bending deformation at the triphenylamine unit under collaboration between intramolecular π-hydrogen bond and disordered intermolecular interactions. Moreover, in the amorphous state, the energy gap between the first singlet excited state (S1) and the first triplet excited state (T1) (ΔEST) of M1 is significantly reduced, and the spin-orbit coupling constant is remarkably increased in comparison with those of M1 in liquid with toluene and crystal state. As a result, the up-conversion of T1 → S1 in the amorphous state is favored, and remarkable TADF is thus observed. Besides, M1 in the solid state gives fluorescence in red shift emission compared to that in liquid with toluene. On the basis of the results above, we further theoretically design a new molecule noted as M2 which emits fluorescence in the near-infrared region in the solid state. Our theoretical results help in understanding the light-emitting mechanism induced by the solid-state effect and provide information for designing new-type TADF emitters with tunable solid-state emission.
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Affiliation(s)
- Kai Zhang
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, 250014 Jinan, China
| | - Yuchen Zhang
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, 250014 Jinan, China
| | - Yuying Ma
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, 250014 Jinan, China
| | - Jianzhong Fan
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, 250014 Jinan, China
| | - Chuan-Kui Wang
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, 250014 Jinan, China
| | - Lili Lin
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, 250014 Jinan, China
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23
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Lu B, Fang X, Yan D. Luminescent Polymorphic Co-crystals: A Promising Way to the Diversity of Molecular Assembly, Fluorescence Polarization, and Optical Waveguide. ACS APPLIED MATERIALS & INTERFACES 2020; 12:31940-31951. [PMID: 32551468 DOI: 10.1021/acsami.0c06794] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The design of molecular optoelectronic materials based on fabricating polymorphs and/or co-crystals has received much recent attention in the fields of luminescence, sensors, nonlinear optics, and so on. If the advantages of the two crystal engineering strategies above were combined, the diversity of self-assembly fashions and the tuning of photofunctional performances would be largely extended. However, such multicomponent examples have still been very limited to date. Herein, we report the construction of luminescent polymorphic co-crystals by assembly of tris(pentafluorophenyl)borane (TPFB) with 9,10-dicyanoanthracene (DCA) and acridine (AC) as paradigms. Different stacking modes and arrangement styles based on identical building block units in polymorphic co-crystals result in adjustable crystalline morphologies and variant photophysical properties (such as fluorescence wavelength, lifetimes, and up-conversion luminescence). The optimized photoluminescence quantum yield (63.1%) and lifetime (57.1 ns) are much higher than those of the pristine assembled units. In addition, two polymorphic co-crystals (DCA@TPFB-1 and AC@TPFB-2) present prominent fluorescence polarization and optical waveguide behaviors due to the highly regulated molecular orientation. Their high one-dimensional luminescence anisotropy (0.652) and low optical waveguide loss (0.0079 dB/μm) outperform most state-of-the-art low-dimensional molecular systems and thus endow them with great opportunities for photonic materials and devices. Therefore, this work not only confirms that constructing polymorphic co-crystals can be an effective way to design new photofunctional materials for luminescence and photonic applications but also discloses a deep understanding on the relationship between variant self-assembled fashions and tunable photofunctional properties of new TPFB-based molecular materials.
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Affiliation(s)
- Bo Lu
- Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, People's Republic of China
| | - Xiaoyu Fang
- Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, People's Republic of China
| | - Dongpeng Yan
- Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, People's Republic of China
- College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450001, People's Republic of China
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24
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Barman D, Gogoi R, Narang K, Iyer PK. Recent Developments on Multi-Functional Metal-Free Mechanochromic Luminescence and Thermally Activated Delayed Fluorescence Organic Materials. Front Chem 2020; 8:483. [PMID: 32695743 PMCID: PMC7338664 DOI: 10.3389/fchem.2020.00483] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Accepted: 05/11/2020] [Indexed: 12/12/2022] Open
Abstract
Metal-free organic compounds with highly ordered π-conjugated twisted skeletons are capable of generating brilliant multi-colored light. Additionally, the co-existence of numerous other multi-functional properties have endowed them with the potential to be a promising class of materials for several electronic and photonic applications and next-generation advanced luminescent material-based devices. This review highlights the recent developments made in this fascinating class of multi-property encompassing materials, involving a highly twisted donor-acceptor based single molecular platform with synchronized photophysical behavior such as thermally activated delayed fluorescence (TADF), mechanoresponsive (MR), room-temperature phosphorescence (RTP), and aggregation induced emission (AIE) with associated unique and inherently manifested structure-property relationship investigations. Furthermore, a brief summary of the optoelectronic behavior of TADF materials are also presented by correlating their performances in the organic light-emitting diodes (OLEDs) and corresponding EL devices. In addition to mechanochromic luminescence (MCL) with TADF behavior, new types of emitters are also being developed, with tunable color changes such as blue-green, yellow-orange, yellow-red, etc., with some emitters crossing the entire visible span to produce white OLEDs. These developments have enriched the library of fascinating organic materials in addition to providing new directions of multifunctional material design for solutions processed OLED and several other advanced devices.
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Affiliation(s)
- Debasish Barman
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, India
| | - Rajdikshit Gogoi
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, India
| | - Kavita Narang
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, India
| | - Parameswar Krishnan Iyer
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, India.,Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati, India
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25
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Kundu S, Sk B, Pallavi P, Giri A, Patra A. Molecular Engineering Approaches Towards All‐Organic White Light Emitting Materials. Chemistry 2020; 26:5557-5582. [DOI: 10.1002/chem.201904626] [Citation(s) in RCA: 63] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Indexed: 12/14/2022]
Affiliation(s)
- Subhankar Kundu
- Department of ChemistryIndian Institute of Science Education and Research Bhopal, Bhopal Bypass, Road Bhauri, Bhopal 462066 Madhya Pradesh India
| | - Bahadur Sk
- Department of ChemistryIndian Institute of Science Education and Research Bhopal, Bhopal Bypass, Road Bhauri, Bhopal 462066 Madhya Pradesh India
| | - Pragyan Pallavi
- Department of ChemistryIndian Institute of Science Education and Research Bhopal, Bhopal Bypass, Road Bhauri, Bhopal 462066 Madhya Pradesh India
| | - Arkaprabha Giri
- Department of ChemistryIndian Institute of Science Education and Research Bhopal, Bhopal Bypass, Road Bhauri, Bhopal 462066 Madhya Pradesh India
| | - Abhijit Patra
- Department of ChemistryIndian Institute of Science Education and Research Bhopal, Bhopal Bypass, Road Bhauri, Bhopal 462066 Madhya Pradesh India
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26
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Chen Z, Ho CL, Wang L, Wong WY. Single-Molecular White-Light Emitters and Their Potential WOLED Applications. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e1903269. [PMID: 32009268 DOI: 10.1002/adma.201903269] [Citation(s) in RCA: 99] [Impact Index Per Article: 24.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Revised: 09/30/2019] [Indexed: 05/06/2023]
Abstract
White organic light-emitting diodes (WOLEDs) are superior to traditional incandescent light bulbs and compact fluorescent lamps in terms of their merits in ensuring pure white-light emission, low-energy consumption, large-area thin-film fabrication, etc. Unfortunately, WOLEDs based on multilayered or multicomponent (red, green, and blue (RGB)) emissive layers can suffer from some remarkable disadvantages, such as intricate device fabrication and voltage-dependent emission color, etc. Single molecules, which can emit white light, can be used to replace multiple emitters, leading to a simplified fabrication process, stable and reproducible WOLEDs. Recently, the performance of WOLEDs by using single molecules is catching up with that of the state-of-the-art devices fabricated by multicomponent emitters. Therefore, an increasing attention has been paid on single white-light-emitting materials for efficient WOLEDs. In this review, different mechanisms of white-light emission from a single molecule and the performance of single-molecule-based WOLEDs are collected and expounded, hoping to light up the interesting subject on single-molecule white-light-emitting materials, which have great potential as white-light emitters for illumination and lighting applications in the world.
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Affiliation(s)
- Zhao Chen
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, P. R. China
- Institute of Molecular Functional Materials and Department of Chemistry, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong, P. R. China
- School of Applied Physics and Materials, Wuyi University, Jiangmen, 529020, P. R. China
| | - Cheuk-Lam Ho
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, P. R. China
- The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen, 518057, P. R. China
| | - Liqi Wang
- Institute of Molecular Functional Materials and Department of Chemistry, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong, P. R. China
| | - Wai-Yeung Wong
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, P. R. China
- Institute of Molecular Functional Materials and Department of Chemistry, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong, P. R. China
- The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen, 518057, P. R. China
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27
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Zheng K, Ni F, Chen Z, Zhong C, Yang C. Polymorph‐Dependent Thermally Activated Delayed Fluorescence Emitters: Understanding TADF from a Perspective of Aggregation State. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201913210] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Kailu Zheng
- Renmin Hospital of Wuhan UniversityHubei Key Laboratory on Organic and Polymeric Optoelectronic MaterialsDepartment of ChemistryWuhan University Wuhan 430072 P. R. China
- Shenzhen Key Laboratory of Polymer Science and TechnologyCollege of Materials Science and EngineeringShenzhen University Shenzhen 518060 P. R. China
| | - Fan Ni
- Shenzhen Key Laboratory of Polymer Science and TechnologyCollege of Materials Science and EngineeringShenzhen University Shenzhen 518060 P. R. China
| | - Zhanxiang Chen
- Renmin Hospital of Wuhan UniversityHubei Key Laboratory on Organic and Polymeric Optoelectronic MaterialsDepartment of ChemistryWuhan University Wuhan 430072 P. R. China
| | - Cheng Zhong
- Renmin Hospital of Wuhan UniversityHubei Key Laboratory on Organic and Polymeric Optoelectronic MaterialsDepartment of ChemistryWuhan University Wuhan 430072 P. R. China
| | - Chuluo Yang
- Renmin Hospital of Wuhan UniversityHubei Key Laboratory on Organic and Polymeric Optoelectronic MaterialsDepartment of ChemistryWuhan University Wuhan 430072 P. R. China
- Shenzhen Key Laboratory of Polymer Science and TechnologyCollege of Materials Science and EngineeringShenzhen University Shenzhen 518060 P. R. China
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28
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Zheng K, Ni F, Chen Z, Zhong C, Yang C. Polymorph‐Dependent Thermally Activated Delayed Fluorescence Emitters: Understanding TADF from a Perspective of Aggregation State. Angew Chem Int Ed Engl 2019; 59:9972-9976. [PMID: 31710142 DOI: 10.1002/anie.201913210] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Indexed: 01/26/2023]
Affiliation(s)
- Kailu Zheng
- Renmin Hospital of Wuhan UniversityHubei Key Laboratory on Organic and Polymeric Optoelectronic MaterialsDepartment of ChemistryWuhan University Wuhan 430072 P. R. China
- Shenzhen Key Laboratory of Polymer Science and TechnologyCollege of Materials Science and EngineeringShenzhen University Shenzhen 518060 P. R. China
| | - Fan Ni
- Shenzhen Key Laboratory of Polymer Science and TechnologyCollege of Materials Science and EngineeringShenzhen University Shenzhen 518060 P. R. China
| | - Zhanxiang Chen
- Renmin Hospital of Wuhan UniversityHubei Key Laboratory on Organic and Polymeric Optoelectronic MaterialsDepartment of ChemistryWuhan University Wuhan 430072 P. R. China
| | - Cheng Zhong
- Renmin Hospital of Wuhan UniversityHubei Key Laboratory on Organic and Polymeric Optoelectronic MaterialsDepartment of ChemistryWuhan University Wuhan 430072 P. R. China
| | - Chuluo Yang
- Renmin Hospital of Wuhan UniversityHubei Key Laboratory on Organic and Polymeric Optoelectronic MaterialsDepartment of ChemistryWuhan University Wuhan 430072 P. R. China
- Shenzhen Key Laboratory of Polymer Science and TechnologyCollege of Materials Science and EngineeringShenzhen University Shenzhen 518060 P. R. China
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29
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Wang XY, Hu YX, Yang XF, Yin J, Chen Z, Liu SH. Excitation Wavelength-Dependent Nearly Pure White Light-Emitting Crystals from a Single Gold(I)-Containing Complex. Org Lett 2019; 21:9945-9949. [PMID: 31793306 DOI: 10.1021/acs.orglett.9b03875] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
A gold(I) complex is reported. Interestingly, crystals of the gold(I) complex exhibit an excellent excitation wavelength-dependent emission effect at room temperature. Notably, a nearly pure white emission with Commission Internationale de L'Eclairage (CIE) 1931 chromaticity coordinates of (0.32, 0.33) is obtained upon excitation with 406 nm light.
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Affiliation(s)
- Xiao-Yan Wang
- Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, College of Chemistry , Central China Normal University , Wuhan 430079 , PR China
| | - Yu-Xuan Hu
- Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, College of Chemistry , Central China Normal University , Wuhan 430079 , PR China
| | - Xiao-Fei Yang
- Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, College of Chemistry , Central China Normal University , Wuhan 430079 , PR China
| | - Jun Yin
- Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, College of Chemistry , Central China Normal University , Wuhan 430079 , PR China
| | - Zhao Chen
- Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, College of Chemistry , Central China Normal University , Wuhan 430079 , PR China.,Jiangxi Key Laboratory of Organic Chemistry , Jiangxi Science and Technology Normal University , Nanchang 330013 , PR China
| | - Sheng Hua Liu
- Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, College of Chemistry , Central China Normal University , Wuhan 430079 , PR China.,State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter , Chinese Academy of Sciences , Fuzhou 350002 , PR China
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30
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Belyaev A, Cheng Y, Liu Z, Karttunen AJ, Chou P, Koshevoy IO. A Facile Molecular Machine: Optically Triggered Counterion Migration by Charge Transfer of Linear Donor‐π‐Acceptor Phosphonium Fluorophores. Angew Chem Int Ed Engl 2019; 58:13456-13465. [DOI: 10.1002/anie.201906929] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Indexed: 01/21/2023]
Affiliation(s)
- Andrey Belyaev
- Department of ChemistryUniversity of Eastern Finland Yliopistokatu 7 80101 Joensuu Finland
| | - Yu‐Hsuan Cheng
- Department of ChemistryNational (Taiwan) University Taipei 106 Taiwan
| | - Zong‐Ying Liu
- Department of ChemistryNational (Taiwan) University Taipei 106 Taiwan
| | - Antti J. Karttunen
- Department of Chemistry and Materials ScienceAalto-University 00076 Aalto Finland
| | - Pi‐Tai Chou
- Department of ChemistryNational (Taiwan) University Taipei 106 Taiwan
| | - Igor O. Koshevoy
- Department of ChemistryUniversity of Eastern Finland Yliopistokatu 7 80101 Joensuu Finland
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31
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Belyaev A, Cheng Y, Liu Z, Karttunen AJ, Chou P, Koshevoy IO. A Facile Molecular Machine: Optically Triggered Counterion Migration by Charge Transfer of Linear Donor‐π‐Acceptor Phosphonium Fluorophores. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201906929] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Andrey Belyaev
- Department of ChemistryUniversity of Eastern Finland Yliopistokatu 7 80101 Joensuu Finland
| | - Yu‐Hsuan Cheng
- Department of ChemistryNational (Taiwan) University Taipei 106 Taiwan
| | - Zong‐Ying Liu
- Department of ChemistryNational (Taiwan) University Taipei 106 Taiwan
| | - Antti J. Karttunen
- Department of Chemistry and Materials ScienceAalto-University 00076 Aalto Finland
| | - Pi‐Tai Chou
- Department of ChemistryNational (Taiwan) University Taipei 106 Taiwan
| | - Igor O. Koshevoy
- Department of ChemistryUniversity of Eastern Finland Yliopistokatu 7 80101 Joensuu Finland
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32
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Zhou D, Liu D, Gong X, Ma H, Qian G, Gong S, Xie G, Zhu W, Wang Y. Solution-Processed Highly Efficient Bluish-Green Thermally Activated Delayed Fluorescence Emitter Bearing an Asymmetric Oxadiazole-Difluoroboron Double Acceptor. ACS APPLIED MATERIALS & INTERFACES 2019; 11:24339-24348. [PMID: 31187977 DOI: 10.1021/acsami.9b07511] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Difluoroboron (BF2)-containing dyes have attracted great interest owing to their exceptionally high luminescence efficiency and good electron-withdrawing properties. However, only a few reports on difluoroboron-based thermally activated delayed fluorescence (TADF) have been addressed. In this contribution, a novel BF2-containing TADF molecule of BFOXD, which contains two acceptor fragments of oxadiazole (OXD) and BF2 and one donor unit of 9,9-dimethylacridine, was synthesized and characterized. For comparison, the precursor of OHOXD bearing one acceptor unit was also investigated. Both molecules clearly show TADF characteristics with sky-blue emission in solution and film state. Additionally, OHOXD undergoes excited-state intramolecular proton transfer-coupled intramolecular charge transfer processes. Using 9-(4-tert-butylphenyl)-3,6-bis(triphenylsilyl)-9H-carbazole (CzSi) as the host, the organic light-emitting diodes fabricated via a solution process show maximum external quantum efficiency (EQE) of 2.98 and 13.8% for OHOXD- and BFOXD-based devices, respectively. While the bipolar TADF host of 10-(4-((4-(9H-carbazol-9-yl)phenyl)sulfonyl)phenyl)-9,9-dimethyl-9,10-dihydroacridine (CzAcSF) is utilized instead of CzSi, the OHOXD- and BFOXD-based devices exhibit better performances with the maximum EQEs of 12.1 and 20.1%, respectively, which render the most efficient and the bluest emission ever reported for the BF2-based TADF molecules. This research demonstrates that introduction of one more acceptor unit into the TADF molecule could have a positive effect on emission efficiency, which opens a new way to design high-efficiency TADF molecules.
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Affiliation(s)
- Di Zhou
- National Experimental Demonstration Center for Materials Science and Engineering, Jiangsu Key Laboratory of Environmentally Friendly Polymeric Materials, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and Applications, School of Materials Science & Engineering , Changzhou University , Changzhou 213164 , China
- College of Chemistry , Xiangtan University , Xiangtan 411105 , China
| | - Denghui Liu
- National Experimental Demonstration Center for Materials Science and Engineering, Jiangsu Key Laboratory of Environmentally Friendly Polymeric Materials, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and Applications, School of Materials Science & Engineering , Changzhou University , Changzhou 213164 , China
| | - Xu Gong
- Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, Department of Chemistry , Wuhan University , Wuhan 430072 , China
| | - Huili Ma
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech) , 30 South Puzhu Road , Nanjing 211816 , China
| | - Gaowei Qian
- National Experimental Demonstration Center for Materials Science and Engineering, Jiangsu Key Laboratory of Environmentally Friendly Polymeric Materials, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and Applications, School of Materials Science & Engineering , Changzhou University , Changzhou 213164 , China
| | - Shaolong Gong
- Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, Department of Chemistry , Wuhan University , Wuhan 430072 , China
| | - Guohua Xie
- Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, Department of Chemistry , Wuhan University , Wuhan 430072 , China
| | - Weiguo Zhu
- National Experimental Demonstration Center for Materials Science and Engineering, Jiangsu Key Laboratory of Environmentally Friendly Polymeric Materials, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and Applications, School of Materials Science & Engineering , Changzhou University , Changzhou 213164 , China
| | - Yafei Wang
- National Experimental Demonstration Center for Materials Science and Engineering, Jiangsu Key Laboratory of Environmentally Friendly Polymeric Materials, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and Applications, School of Materials Science & Engineering , Changzhou University , Changzhou 213164 , China
- Key Laboratory of Advanced Display and System Applications of Ministry of Education , Shanghai University , 149 Yanchang Road , Shanghai 200072 , China
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33
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Liang B, Wang J, Cheng Z, Wei J, Wang Y. Exciplex-Based Electroluminescence: Over 21% External Quantum Efficiency and Approaching 100 lm/W Power Efficiency. J Phys Chem Lett 2019; 10:2811-2816. [PMID: 31082247 DOI: 10.1021/acs.jpclett.9b01140] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Benzimidazole-triazine-based electron acceptor PIM-TRZ with high triplet exited-state energy and strong electron-transport ability was newly developed. A series of highly efficient exciplex emitters have been fabricated. The TAPC:PIM-TRZ (TAPC: di-[4-( N, N-ditoly amino)-phenyl]cyclohexane) film shows a high photoluminescence (PL) quantum yields (PLQY, Φf) of 93.4%, and the device based on TAPC:PIM-TRZ exhibits a low turn-on voltage of 2.3 V, high maximum efficiency of 71.2 cd A-1 (current efficiency, CE), 97.3 lm W-1 (power efficiency, PE), and 21.7% (external quantum efficiency, EQE), as well as a high EQE of 16.2% at a luminance of 5000 cd m-2. The device displays the highest efficiency among reported organic light-emitting devices with an exciplex film as the emitting layer. Furthermore, a green device is also fabricated with a TAPC:PIM-TRZ cohost using C545T (C545T: (10-(2-benzothiazolyl)-2,3,6,7-tetrahydro-1,1,7,7-tetramethyl-1 H,5 H,11 H-benzopyrano[6,7-8- I, j]quinolizin-11-one)) as the dopant, and the highest CE, PE, and EQE are 68.3 cd A-1, 86.6 lm W-1, and 20.2%, respectively.
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Affiliation(s)
- Baoyan Liang
- State Key Laboratory of Supramolecular Structure and Materials , Jilin University , Changchun 130012 , People's Republic of China
| | - Jiaxuan Wang
- State Key Laboratory of Supramolecular Structure and Materials , Jilin University , Changchun 130012 , People's Republic of China
| | - Zong Cheng
- State Key Laboratory of Supramolecular Structure and Materials , Jilin University , Changchun 130012 , People's Republic of China
| | - Jinbei Wei
- State Key Laboratory of Supramolecular Structure and Materials , Jilin University , Changchun 130012 , People's Republic of China
| | - Yue Wang
- State Key Laboratory of Supramolecular Structure and Materials , Jilin University , Changchun 130012 , People's Republic of China
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34
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Zhang Y, Li Z, Li C, Wang Y. Suppressing Efficiency Roll-Off of TADF Based OLEDs by Constructing Emitting Layer With Dual Delayed Fluorescence. Front Chem 2019; 7:302. [PMID: 31114787 PMCID: PMC6502957 DOI: 10.3389/fchem.2019.00302] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2019] [Accepted: 04/15/2019] [Indexed: 01/30/2023] Open
Abstract
To suppress efficiency roll-off induced by triplet–triplet annihilation (TTA) and singlet–triplet annihilation (STA) in thermally activated delayed fluorescence (TADF) based organic light emitting diodes (OLEDs) is still a challenge. This issue was efficiently addressed by generating dual delayed fluorescence in the emitting layer of OLEDs. A novel TADF compound, PXZ-CMO, featuring a D-A structure was designed and synthesized. By dispersing the emitter into different hosts, devices G1 (MCP host) and G2 (DPEPO host) with identical configurations were carefully fabricated, which showed similar maximum EQE/CE of 12.1%/38.2 cd A−1 and 11.8%/33.1 cd A−1, respectively. Despite severe efficiency roll-off in device G2 with only 6.4% EQE remaining at a luminance of 1,000 cd m−2, a remarkably reduced efficiency roll-off was attained in device G1, retaining EQE as high as 10.4% at the same luminance of 1,000 cd m−2. The excellent device performance with reduced roll-off in device G1 should result from the dual delayed fluorescence in the emitting layer, which possesses great advantages in achieving dynamic and adaptive exciton distribution for radiation acceleration and quench suppression.
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Affiliation(s)
- Yuewei Zhang
- State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun, China
| | - Zhiqiang Li
- State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun, China
| | - Chenglong Li
- State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun, China.,State Key Laboratory on Integrated Optoelectronics, Key Laboratory of Advanced Gas Sensors, College of Electronic Science and Engineering, Jilin University, Changchun, China
| | - Yue Wang
- State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun, China
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35
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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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36
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Qi Y, Ding N, Wang Z, Xu L, Fang Y. Mechanochromic Wide-Spectrum Luminescence Based on a Monoboron Complex. ACS APPLIED MATERIALS & INTERFACES 2019; 11:8676-8684. [PMID: 30689340 DOI: 10.1021/acsami.8b21617] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
A reversible mechanochromic luminescent material based on a simple tetrahedral monoboron complex (B-1) is described. Interestingly, in addition to amorphous powders (P), the compound could exist in three unique crystal states (A, B, and C), showing efficient green-to-red luminescent colors, which is a result of wane and wax of dual emissions of the compound. Surprisingly, one of the emissions increases significantly with increasing temperature, fully offsetting the quenching effect of temperature-assisted internal conversion process. The four states are fully interconvertible through grinding and heating, allowing color writing/painting with a single ink.
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Affiliation(s)
- Yanyu Qi
- Key Laboratory of Applied Surface and Colloid Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering , Shaanxi Normal University , Xi'an 710062 , P. R. China
| | - Nannan Ding
- Key Laboratory of Applied Surface and Colloid Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering , Shaanxi Normal University , Xi'an 710062 , P. R. China
| | - Zhaolong Wang
- Key Laboratory of Applied Surface and Colloid Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering , Shaanxi Normal University , Xi'an 710062 , P. R. China
| | - Ling Xu
- Key Laboratory of Applied Surface and Colloid Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering , Shaanxi Normal University , Xi'an 710062 , P. R. China
| | - Yu Fang
- Key Laboratory of Applied Surface and Colloid Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering , Shaanxi Normal University , Xi'an 710062 , P. R. China
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37
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Yang M, Li XN, Jia JH, Chen XL, Lu CZ. A rationally designed vapoluminescent compound with adsorptive channels and responsive luminophores for volatile organic compounds (VOCs). Dalton Trans 2019; 48:1179-1183. [PMID: 30570627 DOI: 10.1039/c8dt04360d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A novel cuprous complex bearing two functional parts, i.e. a luminophoric part and a structural part, exhibits distinct luminescence responses to a variety of volatile organic compounds of different polarities in the solid state.
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Affiliation(s)
- Mingxue Yang
- CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, PR China.
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38
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Sinha S, Chowdhury B, Ghorai UK, Ghosh P. Multitasking behaviour of a small organic compound: solid state bright white-light emission, mechanochromism and ratiometric sensing of Al(iii) and pyrophosphate. Chem Commun (Camb) 2019; 55:5127-5130. [DOI: 10.1039/c8cc10258a] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Solid state bright white-light emission, mechanochromism and ratiometric fluorescence sensing of Al3+ and pyrophosphate by a single organic molecule are demonstrated.
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Affiliation(s)
- Sanghamitra Sinha
- School of Chemical Sciences
- Indian Association for the Cultivation of Science
- Kolkata
- India
| | - Bijit Chowdhury
- School of Chemical Sciences
- Indian Association for the Cultivation of Science
- Kolkata
- India
| | - Uttam Kumar Ghorai
- Department of Industrial Chemistry and Applied Chemistry
- Ramakrishna Mission Vidyamandira & Swami Vivekananda Research Center
- Belur Math
- India
| | - Pradyut Ghosh
- School of Chemical Sciences
- Indian Association for the Cultivation of Science
- Kolkata
- India
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39
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Yang H, Zheng J, Peng SK, Zhu XW, Wan MY, Lu W, Li D. A chemopalette strategy for white light by modulating monomeric and excimeric phosphorescence of a simple Cu(i) cyclic trinuclear unit. Chem Commun (Camb) 2019; 55:4635-4638. [DOI: 10.1039/c9cc00716d] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cu3(4-chloropyrazolate)3 is presented herein to exhibit unprecedented room-temperature white phosphorescence by modulating monomeric blue and excimeric yellow phosphorescence.
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Affiliation(s)
- Hu Yang
- College of Chemistry and Materials Science
- Jinan University
- Guangzhou 510632
- P. R. China
- Department of Chemistry
| | - Ji Zheng
- College of Chemistry and Materials Science
- Jinan University
- Guangzhou 510632
- P. R. China
| | - Su-Kao Peng
- College of Chemistry and Materials Science
- Jinan University
- Guangzhou 510632
- P. R. China
| | - Xiao-Wei Zhu
- College of Chemistry and Materials Science
- Jinan University
- Guangzhou 510632
- P. R. China
| | - Meng-Yan Wan
- College of Chemistry and Materials Science
- Jinan University
- Guangzhou 510632
- P. R. China
| | - Weigang Lu
- College of Chemistry and Materials Science
- Jinan University
- Guangzhou 510632
- P. R. China
| | - Dan Li
- College of Chemistry and Materials Science
- Jinan University
- Guangzhou 510632
- P. R. China
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40
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Wang H, Li Y, Zhang Y, Mei J, Su J. A new strategy for achieving single-molecular white-light emission: using vibration-induced emission (VIE) plus aggregation-induced emission (AIE) mechanisms as a two-pronged approach. Chem Commun (Camb) 2019; 55:1879-1882. [DOI: 10.1039/c8cc08513g] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Single-molecular white-light emissions were achieved through the simple but judicious combination of vibration-induced emission (VIE) and aggregation-induced emission (AIE) mechanisms.
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Affiliation(s)
- Huan Wang
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- School of Chemistry and Molecular Engineering
- East China University of Science & Technology
- Shanghai 200237
- P. R. China
| | - Yiru Li
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- School of Chemistry and Molecular Engineering
- East China University of Science & Technology
- Shanghai 200237
- P. R. China
| | - Yiyao Zhang
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- School of Chemistry and Molecular Engineering
- East China University of Science & Technology
- Shanghai 200237
- P. R. China
| | - Ju Mei
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- School of Chemistry and Molecular Engineering
- East China University of Science & Technology
- Shanghai 200237
- P. R. China
| | - Jianhua Su
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- School of Chemistry and Molecular Engineering
- East China University of Science & Technology
- Shanghai 200237
- P. R. China
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41
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Tao P, Miao Y, Wang H, Xu B, Zhao Q. High-Performance Organic Electroluminescence: Design from Organic Light-Emitting Materials to Devices. CHEM REC 2018; 19:1531-1561. [PMID: 30358067 DOI: 10.1002/tcr.201800139] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2018] [Accepted: 10/02/2018] [Indexed: 12/24/2022]
Abstract
Organic electroluminescence is considered as the most competitive alternative for the future solid-state displays and lighting techniques owing to many advantages such as self-luminescence, high efficiency, high contrast, high color rendering index, ultra-thin thickness, transparency, flat and flexibility, etc. The development of high-performance organic electroluminescence has become the continuing focus of research. In this personal account, a brief overview of representative achievements in our study on the design of highly efficient novel organic light-emitting materials (including fluorescent materials, phosphorescent iridium(III) complexes and conjugated polymers bearing phosphorescent iridium(III) complex) and high-performance device structures together with working principles are given. At last, we will give some perspectives on this fascinating field, and also try to provide some potential directions of research on the basis of the current stage of organic electroluminescence.
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Affiliation(s)
- Peng Tao
- Key Laboratory of Interface Science and Engineering in Advanced Materials of Ministry of Education and Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology, No. 79, Yingze West Street, Taiyuan, 030024, P.R. China.,Key Laboratory for Organic Electronics and Information Displays and Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts and Telecommunications (NUPT), No. 9, Wenyuan Road, Nanjing, 210023, P.R. China
| | - Yanqin Miao
- Key Laboratory of Interface Science and Engineering in Advanced Materials of Ministry of Education and Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology, No. 79, Yingze West Street, Taiyuan, 030024, P.R. China
| | - Hua Wang
- Key Laboratory of Interface Science and Engineering in Advanced Materials of Ministry of Education and Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology, No. 79, Yingze West Street, Taiyuan, 030024, P.R. China
| | - Bingshe Xu
- Key Laboratory of Interface Science and Engineering in Advanced Materials of Ministry of Education and Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology, No. 79, Yingze West Street, Taiyuan, 030024, P.R. China
| | - Qiang Zhao
- Key Laboratory for Organic Electronics and Information Displays and Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts and Telecommunications (NUPT), No. 9, Wenyuan Road, Nanjing, 210023, P.R. China
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Bhattacharjee I, Acharya N, Bhatia H, Ray D. Dual Emission through Thermally Activated Delayed Fluorescence and Room-Temperature Phosphorescence, and Their Thermal Enhancement via Solid-State Structural Change in a Carbazole-Quinoline Conjugate. J Phys Chem Lett 2018; 9:2733-2738. [PMID: 29734806 DOI: 10.1021/acs.jpclett.8b00937] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The emergence of single-component organic dual light emitters holds great promise for white light-emitting diodes (WLEDs) and biological detection due to the involvement of broad emission covering visible spectrum. Here we show experimental studies on dual emission of carbazole-quinoline conjugate (CQ) that exhibits both thermally activated delayed fluorescence (TADF) via reverse intersystem crossing (r ISC) from the higher-lying triplet state ( T2) to the singlet state ( S1) and room-temperature phosphorescence (RTP) from the lowest triplet state ( T1) due to low energy gap between T2 and S1, and energetic proximity of T1 with T2. We found in thermal effect that the intensity of the dual features is enhanced with increasing temperatures up to 100 °C, which can be explained by a thermal-induced structural change (TISC) mechanism that compensates the emission losses due to nonradiative transitions at elevated temperatures. This property, in addition to its enhanced TADF and phosphorescence decay rates (∼107 s-1and 101 s-1) at 100 °C, would have great promise for high-efficiency LEDs.
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Affiliation(s)
- Indranil Bhattacharjee
- Department of Chemistry , School of Natural Sciences , NH-91, Tehsil Dadri , District Gautam Buddha Nagar , Uttar Pradesh 201314 , India
| | - Nirmalya Acharya
- Department of Chemistry , School of Natural Sciences , NH-91, Tehsil Dadri , District Gautam Buddha Nagar , Uttar Pradesh 201314 , India
| | - Harsh Bhatia
- Department of Chemistry , School of Natural Sciences , NH-91, Tehsil Dadri , District Gautam Buddha Nagar , Uttar Pradesh 201314 , India
| | - Debdas Ray
- Department of Chemistry , School of Natural Sciences , NH-91, Tehsil Dadri , District Gautam Buddha Nagar , Uttar Pradesh 201314 , India
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He Z, Cai X, Wang Z, Chen D, Li Y, Zhao H, Liu K, Cao Y, Su SJ. Reversible switching between normal and thermally activated delayed fluorescence towards “smart” and single compound white-light luminescence via controllable conformational distribution. Sci China Chem 2018. [DOI: 10.1007/s11426-017-9219-x] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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44
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Barboza CA, Sobolewski AL. An Ab initio study on the photophysics of tris(salicylideneaniline). Phys Chem Chem Phys 2018; 20:25164-25168. [DOI: 10.1039/c8cp04416c] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Sequential excited-state proton transfers result in multiple band fluorescence spectrum.
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