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Paras, Ramachandran CN. Tuning the Electronic and Optical Properties of Phenoxaborin Based Thermally Activated Delayed Fluorescent Materials: A DFT Study. J Fluoresc 2024:10.1007/s10895-023-03545-0. [PMID: 38170425 DOI: 10.1007/s10895-023-03545-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Accepted: 12/07/2023] [Indexed: 01/05/2024]
Abstract
The electronic and optoelectronic properties of molecules constituted by benzene as linker, phenoxaborin as acceptor coupled with different types of donor moieties are investigated using the density functional theoretical method. The energy gap between the first excited singlet and triplet states (ΔEST) of the designed molecules (1-9) is found to be less than 0.5 eV suggesting them as ideal candidates for thermally activated delayed fluorescence (TADF) emitters. The analysis of frontier molecular orbitals of the molecules revealed a minimum spatial overlap between highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) in favor of the small values of ΔEST. Among the molecules studied, the one in which dihydrophenazine acts as the donor has the lowest value of ΔEST. All designed molecules are good electron transporters. The non-linear optical properties of the molecules are also examined.
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Affiliation(s)
- Paras
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247667, Uttarakhand, India
| | - C N Ramachandran
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247667, Uttarakhand, India.
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2
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Zhao Z, Zhao H, Liu J, Ren Z. Synthesis and Properties of Bipolar Ladder-Like Polysiloxane with Carbazole and Triphenylphosphine Oxygen Groups. Macromol Rapid Commun 2023; 44:e2300233. [PMID: 37366221 DOI: 10.1002/marc.202300233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Revised: 05/23/2023] [Indexed: 06/28/2023]
Abstract
In this study, a series of ladder-like polysiloxanes are synthesized by introducing double-chain Si-O-Si polymer as the backbone and the carbazole and triphenylphosphine oxide with high triplet energy as side groups. The ladder-like structures of polysiloxanes are achieved through a controlled polymerization method that involves the monomer self-assembly and subsequent surface-restricted solid-phase in situ condensation through freeze-drying. The introduction of siloxane improves thermal stability of the polymers and inhibits the conjugation of the polymers between the side groups, leading to an increase in the triplet energy level. Therefore, all these polymers perform higher triplet energy levels than phosphorescent emitter (FIrpic). The cyclic voltammetry measurements demonstrate that the bipolar polymer exhibits a high highest occupied molecular orbital (HOMO) value of -5.32 eV, which is consistent with the work function of ITO/PEDOT:PSS, consequently facilitating hole injection. Furthermore, the incorporation of triphenylphosphine oxide promotes electron injection. Molecular simulations reveal that the frontier orbital distributions of the bipolar polymer are located on the carbazole and triphenylphosphine groups, respectively, which facilitate the transport of electrons and holes.
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Affiliation(s)
- Zhennan Zhao
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Haisong Zhao
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Junteng Liu
- Beijing Key Laboratory of Membrane Science and Technology, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Zhongjie Ren
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
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Dobrikov GM, Nikolova Y, Slavchev I, Dangalov M, Deneva V, Antonov L, Vassilev NG. Structure and Conformational Mobility of OLED-Relevant 1,3,5-Triazine Derivatives. Molecules 2023; 28:molecules28031248. [PMID: 36770913 PMCID: PMC9921695 DOI: 10.3390/molecules28031248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Revised: 01/24/2023] [Accepted: 01/25/2023] [Indexed: 01/31/2023] Open
Abstract
A series of OLED-relevant compounds, consisting of 1,3,5-triazine core linked to various aromatic arms by amino group, has been synthesized and characterized. The studied compounds exist in solution as a mixture of two conformers, a symmetric propeller and asymmetric conformer, in which one of the aromatic arms is rotated around the C-N bond. At temperatures below -40 °C, the VT NMR spectra in DMF-d7 are in a slow exchange regime, and the signals of two conformers can be elucidated. At temperatures above 100 °C, the VT NMR spectra in DMSO-d6 are in a fast exchange regime, and the averaged spectra can be measured. The ratio of symmetric and asymmetric conformers in DMF-d7 varies from 14:86 to 50:50 depending on the substituents. The rotational barriers of symmetric and asymmetric conformers in DMF-d7 were measured for all compounds and are in the interval from 11.7 to 14.7 kcal/mol. The ground-state energy landscapes of the studied compounds, obtained by DFT calculations, show good agreement with the experimental rotational barriers. The DFT calculations reveal that the observed chemical exchange occurs by the rotation around the C(1,3,5-triazine)-N bond. Although some of the compounds are potentially tautomeric, the measured absorption and emission spectra do not indicate proton transfer neither in the ground nor in the excited state.
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Affiliation(s)
- Georgi M. Dobrikov
- Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 9, 1113 Sofia, Bulgaria
| | - Yana Nikolova
- Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 9, 1113 Sofia, Bulgaria
| | - Ivaylo Slavchev
- Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 9, 1113 Sofia, Bulgaria
| | - Miroslav Dangalov
- Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 9, 1113 Sofia, Bulgaria
| | - Vera Deneva
- Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 9, 1113 Sofia, Bulgaria
- Institute of Electronics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee Blvd., 1784 Sofia, Bulgaria
| | - Liudmil Antonov
- Institute of Electronics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee Blvd., 1784 Sofia, Bulgaria
| | - Nikolay G. Vassilev
- Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 9, 1113 Sofia, Bulgaria
- Correspondence:
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Streater D, Duisenova K, Luo J, Kohlstedt KL, Zhang J, Huang J. Impact of π-Conjugation Length on the Excited-State Dynamics of Star-Shaped Carbazole-π-Triazine Organic Chromophores. J Phys Chem A 2022; 126:3291-3300. [PMID: 35594508 DOI: 10.1021/acs.jpca.2c00682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Correlating star-shaped donor-bridge-acceptor (DBA) molecular structures with intramolecular charge transfer (ICT) and intersystem crossing (ISC) is essential to their application in photocatalysis, photovoltaics, and organic light-emitting diodes (OLEDs). In this work, we report a systematic photophysical study on a series of star-shaped triazine-phenylene-carbazole DBA molecules with 0, 1, and 2 bridging phenylene units (pTCT-0P, pTCT-1P, pTCT-2P). Using a combination of steady-state and time-resolved spectroscopy with time-dependent density functional theory (TDDFT), we find that the bridge length can strongly impact the structural conformation, ICT, and ISC. Global target analysis of the time-resolved spectroscopy reveals that pTCT-0P has the most favorable ISC rate of 1.96 × 10-4 ps-1, which is competitive with a singlet relaxation rate of 1.92 × 10-4 ps-1. TDDFT aligns with spectroscopic results within an order of magnitude, predicting an ISC rate of 2.1 × 10-5 ps-1 and revealing that the donor/acceptor orthogonalization concomitantly suppresses singlet exciton recombination and lowers the singlet-triplet energy gap. The new fundamental insights gained from this work will help design the next generation of star-shaped DBA-type molecules for photocatalytic and photoelectronic applications.
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Affiliation(s)
- Daniel Streater
- Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201, United States
| | - Korlan Duisenova
- Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201, United States
| | - Jian Luo
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
| | - Kevin L Kohlstedt
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
| | - Jian Zhang
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States.,The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Jier Huang
- Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201, United States
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Lade JJ, Chiou S, Tseng Y, Chiu M, Lin Y, Chang C, Chetti P, Chaskar AC. Design and Synthesis of Novel Phenothiazine‐Benzothiadiazine‐1,1‐dioxide Hybrid Organic Material for OLED Applications. ChemistrySelect 2021. [DOI: 10.1002/slct.202102781] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Jatin J. Lade
- National Centre for Nanosciences and Nanotechnology University of Mumbai Mumbai 400098 India
| | - Shian‐Sung Chiou
- Department of Electrical Engineering Yuan Ze University Chung-Li 32003 Taiwan
| | - Yeh‐Hsiang Tseng
- Department of Electrical Engineering Yuan Ze University Chung-Li 32003 Taiwan
| | - Meng‐Hsuan Chiu
- Department of Electrical Engineering Yuan Ze University Chung-Li 32003 Taiwan
| | - Yi‐Fan Lin
- Department of Electrical Engineering Yuan Ze University Chung-Li 32003 Taiwan
| | - Chih‐Hao Chang
- Department of Electrical Engineering Yuan Ze University Chung-Li 32003 Taiwan
| | - Prabhakar Chetti
- Department of Chemistry National Institute of Technology Kurukshetra 136119 Haryana India
| | - Atul C. Chaskar
- National Centre for Nanosciences and Nanotechnology University of Mumbai Mumbai 400098 India
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Yu P, Xiao Y. Non-Doped Deep-Blue OLEDs Based on Carbazole-π-Imidazole Derivatives. MATERIALS 2021; 14:ma14092349. [PMID: 33946557 PMCID: PMC8125583 DOI: 10.3390/ma14092349] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Revised: 04/27/2021] [Accepted: 04/28/2021] [Indexed: 11/16/2022]
Abstract
In this work, we designed and synthesized four bipolar blue-emitting materials with carbazole, imidazole, and biphenyl as donor, acceptor, and p bridge, respectively. The twisted phenylimidazole acceptor leads to a wider band-gap and hence deeper blue emission than the conjugated phenanthrimidazole acceptor. For the substituents on the carbazole donor, the t-butyl group could prevent the intramolecular charge transfer (ICT) process more effectively than the methoxy group. A non-doped deep-blue organic light-emitting diodes (OLED) is obtained with CIE coordinates of (0.159, 0.080), a maximum luminance of 11,364 cd/m2, and a maximum EQE of 4.43%.
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7
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Lu X, Wan B. Palladium‐Catalyzed C−H Functionalization of Diaryl 1,3,5‐Triazines. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Xiaodong Lu
- Dalian Institute of Chemical Physics Chinese Academy of Sciences 457 Zhongshan Road Dalian 116023 China
- University of Chinese Academy of Sciences 19A Yuquan Road, Shijingshan District Beijing 100049 China
| | - Boshun Wan
- Dalian Institute of Chemical Physics Chinese Academy of Sciences 457 Zhongshan Road Dalian 116023 China
- University of Chinese Academy of Sciences 19A Yuquan Road, Shijingshan District Beijing 100049 China
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Wu ZG, Yang B, Qiu YC, Wang Y, Dai H, Zheng YX, Wang Y, Hu L, Pan Y. Design of pyridinylphosphinate-based blue iridium phosphors for high-efficiency organic light-emitting diodes. Dalton Trans 2021; 50:3887-3893. [PMID: 33634813 DOI: 10.1039/d0dt03981k] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
At present, cyclometalated iridium (Ir)(iii) complexes are the most promising emitters for OLEDs. Contrary to well-developed Ir(iii)-based red and green phosphorescent complexes, the efficient blue emitters are limited and the performances of blue OLEDs are still not satisfactory. Inspired by this, we designed two novel blue Ir(iii) complexes employing 2-(2,4-difluoropyridyl)pyridine (dfpypy) and 2,6-difluoro-3-(pyridin-2-yl)benzonitrile (FCN) as the main ligands, respectively, and phenyl(pyridin-2-yl)phosphinate (ppp) as the ancillary ligand. The rational design of the molecular structure makes the two complexes achieve blue emission and possess good electron mobility simultaneously. The devices based on the Ir(iii) phosphors exhibited good electroluminescence performances with low turn-on voltages, a peak current efficiency of 24.51 cd A-1, a maximum external quantum efficiency of 12.4%, a peak power efficiency of 21.99 lm W-1 and low efficiency roll-off. These results provide an effective strategy for the future molecular design of blue Ir(iii) complexes with good electron transport property for OLEDs.
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Affiliation(s)
- Zheng-Guang Wu
- College of Chemistry and Chemical Engineering, Nantong University, Nantong, Jiangsu 226019, P. R. China.
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Jung H, Shin H, Kim S, Kim J, An BK, Lee JH, Ihee H, Park J. High electroluminescence efficiency and long device lifetime of a fluorescent green-light emitter using aggregation-induced emission. J IND ENG CHEM 2020. [DOI: 10.1016/j.jiec.2020.04.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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10
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Novel aromatic extended carbazoles as a chemical platform of bipolar hosts for improved lifetime in phosphorescent organic light-emitting diodes. J IND ENG CHEM 2020. [DOI: 10.1016/j.jiec.2019.12.036] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Min H, Park IS, Yasuda T. Dipolar and Quadrupolar Luminophores Based on 1,8‐Dimethylcarbazole−Triazine Conjugates for High‐Efficiency Blue Thermally Activated Delayed Fluorescence OLEDs. CHEMPHOTOCHEM 2019. [DOI: 10.1002/cptc.201900186] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Hyukgi Min
- INAMORI Frontier Research Center (IFRC)Kyushu University 744 Motooka, Nishi-ku Fukuoka 819-0395 Japan
- Department of Applied Chemistry, Graduate School of EngineeringKyushu University 744 Motooka, Nishi-ku Fukuoka 819-0395 Japan
| | - In Seob Park
- INAMORI Frontier Research Center (IFRC)Kyushu University 744 Motooka, Nishi-ku Fukuoka 819-0395 Japan
| | - Takuma Yasuda
- INAMORI Frontier Research Center (IFRC)Kyushu University 744 Motooka, Nishi-ku Fukuoka 819-0395 Japan
- Department of Applied Chemistry, Graduate School of EngineeringKyushu University 744 Motooka, Nishi-ku Fukuoka 819-0395 Japan
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Jayabharathi J, Goperundevi G, Thanikachalam V, Panimozhi S. Regulation of Singlet and Triplet Excitons in a Single Emission Layer: Efficient Fluorescent/Phosphorescent Hybrid White Organic Light-Emitting Diodes. ACS OMEGA 2019; 4:15030-15042. [PMID: 31552345 PMCID: PMC6751706 DOI: 10.1021/acsomega.9b01815] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Accepted: 07/23/2019] [Indexed: 06/10/2023]
Abstract
Two efficient fluorescent molecules, viz., (E)-2-(2-4-(1-2,3-dihydrobenzo[b][1,4]dioxin-5-yl)-4,5-diphenyl-H-imidazole-2-yl)-[1,1-biphenyl]-4-yl)vinyl-1-yl(naphthalene-1-yl)-1H-phenanthro[9,10-d]imidazole (DDIBNPPI) and (E)-4-(2-(2-(-4'-1(2,3-dihyderobenzo[b][1,4]dioxin-5-yl)-4,5-diphenyl-1H-imidazole-2-yl)-[1,1'-biphenyl]-4-yl)vinyl)-1H-phenanthr[9,10-d]imidazole-1-yl)-1-napthronitrile (DDIBPPIN), were designed and synthesized. DDIBNPPI and DDIBPPIN were obtained by rupturing the covalent bond of phenanthrimidazole core to prevent aggregation-induced quenching. In DDIBPPIN, naphthonitrile group was incorporated into azomethine nitrogen of phenanthrimidazole to enhance charge-transfer ability. The DDIBPPIN/CBP:DDIBPPIN-based device shows blue emission with ηc (current efficiency) of 4.91/4.10 cd/A, ηp (power efficiency) of 4.56/3.84 lm/W, and ηex (external quantum efficiency) of 5.11/5.96%. The ηs (exciton utilization efficiency) values of DDIPNPPI and DDIBPPIN are of 27.0 and 30.3%, respectively. The DDIPNPPI and DDIBPPIN materials employed as a host to fabricate green and red phosphorescent organic light-emitting diodes. The red/white devices (with 0.4% dopant concentration) with DDIBPPIN:Ir(MDQ)2(acac) exhibit maximum L of 69889/26319 cd/m2, ηex of 19.6/16.6%, ηc of 34.6/35.6 cd/A, and ηp of 35.8/36.6 lm/W. The device with DDIBPPIN:Ir(ppy)3/DDIPNPPI:Ir(ppy)3 exhibits green emission [Commission Internationale de l'Eclairage (0.30,0.60)/(0.30,0.60)] with maximum L of 69906/69482 cd/m2, ηex of 17.9/17.0%, ηc of 59.8/58.6 cd/A, and ηp of 63.6/61.3 lm/W. The white device using DDIBPPI:Ir(ppy)3 (with 0.4% dopant concentration) exhibits maximum L of 22152 cd/m2, ηex of 15.8%, ηc of 31.4 cd/A, and ηp of 36.1 lm/W.
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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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Meta-substituted bipolar imidazole based emitter for efficient non-doped deep blue organic light emitting devices with a high electroluminescence. J Photochem Photobiol A Chem 2019. [DOI: 10.1016/j.jphotochem.2019.04.033] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Jayabharathi J, Sujatha P, Thanikachalam V, Nethaji P. Efficient donor-acceptor host materials for green organic light-emitting devices: non-doped blue-emissive materials with dual charge transport properties. RSC Adv 2018; 8:20007-20015. [PMID: 35541653 PMCID: PMC9080778 DOI: 10.1039/c8ra02840k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Accepted: 05/15/2018] [Indexed: 12/02/2022] Open
Abstract
Comparative optical, electroluminescence and theoretical studies were performed for (E)-4'-(1-(4-(2-(1-(4-morpholinophenyl)-1H-phenanthro[9,10-d]imidazol-2-yl)vinyl)phenyl)-1H-phenanthro[9,10-d]imidazol-2-yl)-N,N-diphenyl-[1,1'-biphenyl]-4-amine (SMPI-TPA) and (E)-4-(4-(2-(4-(2-(4-(9H-carbazol-9-yl)phenyl)-1H-phenanthro[9,10-d]imidazol-1-yl)styryl)-1H-phenanthro[9,10-d]imidazol-1-yl)phenyl)morpholine (SMPI-Cz). These compounds show excellent thermal properties, dual charge transport properties and form thin films under thermal evaporation. Blue OLEDs (CIE: 0.16, 0.08) based on SMPI-TPA show efficient device performance (η ex 6.1%; η c 5.3 cd A-1; η p 5.2 lm W-1) at low turn-on voltages. Both SMPI-TPA and SMPI-Cz were utilised as hosts for green OLEDs. The devices with SMPI-Cz (30 nm):5 wt% Ir(ppy)3 exhibit maximum luminance of 20 725 cd m-2, and η c and η p values of 61.4 cd A-1 and 63.8 lm W-1, respectively. In comparison, devices with SMPI-TPA (30 nm):5 wt% Ir(ppy)3 exhibit high η c and η p values of 65.2 cd A-1 and 67.1 lm W-1, respectively. Maximum η ex values of 19.6% and 23.4% were obtained from SMPI-TPA:Ir(ppy)3 and SMPI-Cz:Ir(ppy)3, respectively. These device performances indicate that the phenanthroimidazole unit is a tunable building unit for efficient carrier injection and it may also be employed as a host for green OLEDs.
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Affiliation(s)
- Jayaraman Jayabharathi
- Department of Chemistry, Annamalai University Annamalainagar 608 002 Tamilnadu India +91 9443940735
| | - Palanisamy Sujatha
- Department of Chemistry, Annamalai University Annamalainagar 608 002 Tamilnadu India +91 9443940735
| | - Venugopal Thanikachalam
- Department of Chemistry, Annamalai University Annamalainagar 608 002 Tamilnadu India +91 9443940735
| | - Pavadai Nethaji
- Department of Chemistry, Annamalai University Annamalainagar 608 002 Tamilnadu India +91 9443940735
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Triazine-containing blue emitting Hyperbranched polyamide with donor-acceptor architecture: synthesis, characterization, optoelectronic properties, and sensing behaviors toward ferric ions. JOURNAL OF POLYMER RESEARCH 2018. [DOI: 10.1007/s10965-018-1456-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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17
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Wang S, Lee CW, Lee JY, Hwang SH. Synthesis and green phosphorescent OLED device performance of cyanofluorene-linked phenylcarbazoles as host material. NEW J CHEM 2018. [DOI: 10.1039/c7nj03748a] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A series of three isomeric bipolar host materials for green phosphorescent organic light-emitting diodes (PhOLEDs) was synthesized from a combination of cyanofluorene and N-phenylcarbazole moieties.
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Affiliation(s)
- Shuxin Wang
- Department of Polymer Science & Engineering
- Materials Chemistry & Engineering Laboratory
- Dankook University
- Yongin
- Korea
| | - Chil Won Lee
- Department of Chemistry
- Dankook University
- Chonan
- Korea
| | - Jun Yeob Lee
- School of Chemical Engineering
- Sungkyunkwan University
- Suwon
- Korea
| | - Seok-Ho Hwang
- Department of Polymer Science & Engineering
- Materials Chemistry & Engineering Laboratory
- Dankook University
- Yongin
- Korea
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18
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Song JE, Lee SE, Song YR, Kim TW, Lim CW, Kim YK. Bipolar Host Materials Based on 1,3,5-Triazine Derivative for Green Phosphorescent Organic Light-emitting Diode. B KOREAN CHEM SOC 2017. [DOI: 10.1002/bkcs.11196] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Jung Eun Song
- Graduate School of East-West Medical Science; Kyung Hee University; Gyeonggi-do 449-701 Republic of Korea
| | - Song Eun Lee
- Department of Information Display; Hongik University; Seoul 121-791 Republic of Korea
| | - Yeong Ran Song
- Department of Chemistry, College of Life Science and Nano-technology; Hannam University; Daejeon 305-811 Republic of Korea
| | - Tae Woo Kim
- Graduate School of East-West Medical Science; Kyung Hee University; Gyeonggi-do 449-701 Republic of Korea
| | - Choon Woo Lim
- Department of Chemistry, College of Life Science and Nano-technology; Hannam University; Daejeon 305-811 Republic of Korea
| | - Young Kwan Kim
- Department of Information Display; Hongik University; Seoul 121-791 Republic of Korea
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19
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Lien YJ, Lin TC, Yang CC, Chiang YC, Chang CH, Liu SH, Chen YT, Lee GH, Chou PT, Lu CW, Chi Y. First N-Borylated Emitters Displaying Highly Efficient Thermally Activated Delayed Fluorescence and High-Performance OLEDs. ACS APPLIED MATERIALS & INTERFACES 2017; 9:27090-27101. [PMID: 28731681 DOI: 10.1021/acsami.7b08258] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Despite the fast boom of thermally activated delayed fluorescence (TADF) emitters bearing borane-based acceptor, so far, no TADF emitter with a direct B-N linkage between N-donor and boryl acceptor has been reported. The latter should simplify the molecular architecture and hence facilitate the synthetic design and versatility. We report here the preparation and characterization of a new series of N-borylated compounds with functional acridine donor unit; namely: ACBM, PACBM, and SACBM. Spectroscopic studies were performed to explore their photophysical properties that exhibited prominent solvatochromism and thermally activated delayed fluorescence. The time-dependent DFT calculation indicated the involvement of substantial intramolecular charge transfer character for which HOMO and LUMO are spatially separated. For compound SACBM, fabrication of green emitting OLED gave CIE chromaticity of (0.22, 0.59) and maximum external quantum efficiency, luminance efficiency and power efficiency of 19.1%, 60.9 cd/A, and 43.6 lm/W, respectively, demonstrating for the first time the highly efficient OLEDs using N-borylated TADF emitters.
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Affiliation(s)
- Yi-Jyun Lien
- Department of Chemistry, National Tsing Hua University , Hsinchu 30013, Taiwan
| | - Tzu-Chieh Lin
- Department of Chemistry, National Taiwan University , Taipei 10617, Taiwan
| | - Chun-Chieh Yang
- Department of Photonics Engineering, Yuan Ze University , Chungli 32003, Taiwan
| | - Yu-Cheng Chiang
- Department of Photonics Engineering, Yuan Ze University , Chungli 32003, Taiwan
| | - Chih-Hao Chang
- Department of Photonics Engineering, Yuan Ze University , Chungli 32003, Taiwan
| | - Shih-Hung Liu
- Department of Chemistry, National Taiwan University , Taipei 10617, Taiwan
| | - Yi-Ting Chen
- Department of Chemistry, National Taiwan University , Taipei 10617, Taiwan
| | - Gene-Hsiang Lee
- Department of Chemistry, National Taiwan University , Taipei 10617, Taiwan
| | - Pi-Tai Chou
- Department of Chemistry, National Taiwan University , Taipei 10617, Taiwan
| | - Chin-Wei Lu
- Department of Chemistry, National Tsing Hua University , Hsinchu 30013, Taiwan
| | - Yun Chi
- Department of Chemistry, National Tsing Hua University , Hsinchu 30013, Taiwan
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20
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Kim SM, Yun JH, Byeon SY, Jeon SK, Lee JY. Effect of interconnection position of bicarbazole-triazine type bipolar host materials on the photophysical and device performances. J IND ENG CHEM 2017. [DOI: 10.1016/j.jiec.2017.03.016] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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21
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Thanikachalam V, Jeeva P, Jayabharathi J. Highly efficient non-doped blue organic light emitting diodes based on a D–π–A chromophore with different donor moieties. RSC Adv 2017. [DOI: 10.1039/c6ra28303a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
The non-doped OLED based on MPPIS-Cz exhibits blue emission with CIE of (0.16, 0.08), maximum current and external quantum efficiency of 1.52 cd A−1 and of 1.42%, respectively.
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22
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Yang Z, Mao Z, Xie Z, Zhang Y, Liu S, Zhao J, Xu J, Chi Z, Aldred MP. Recent advances in organic thermally activated delayed fluorescence materials. Chem Soc Rev 2017; 46:915-1016. [DOI: 10.1039/c6cs00368k] [Citation(s) in RCA: 1413] [Impact Index Per Article: 201.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Thermally activated delayed fluorescence: harvesting dark triplet excitons to generate bright emissive singlet excitons.
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Affiliation(s)
- Zhiyong Yang
- PCFM Lab
- GD HPPC Lab
- Guangdong Engineering Technology Research Center for High-performance Organic and Polymer Photoelectric Functional Films
- State Key Laboratory of Optoelectronic Material and Technologies
- School of Chemistry
| | - Zhu Mao
- PCFM Lab
- GD HPPC Lab
- Guangdong Engineering Technology Research Center for High-performance Organic and Polymer Photoelectric Functional Films
- State Key Laboratory of Optoelectronic Material and Technologies
- School of Chemistry
| | - Zongliang Xie
- PCFM Lab
- GD HPPC Lab
- Guangdong Engineering Technology Research Center for High-performance Organic and Polymer Photoelectric Functional Films
- State Key Laboratory of Optoelectronic Material and Technologies
- School of Chemistry
| | - Yi Zhang
- PCFM Lab
- GD HPPC Lab
- Guangdong Engineering Technology Research Center for High-performance Organic and Polymer Photoelectric Functional Films
- State Key Laboratory of Optoelectronic Material and Technologies
- School of Chemistry
| | - Siwei Liu
- PCFM Lab
- GD HPPC Lab
- Guangdong Engineering Technology Research Center for High-performance Organic and Polymer Photoelectric Functional Films
- State Key Laboratory of Optoelectronic Material and Technologies
- School of Chemistry
| | - Juan Zhao
- PCFM Lab
- GD HPPC Lab
- Guangdong Engineering Technology Research Center for High-performance Organic and Polymer Photoelectric Functional Films
- State Key Laboratory of Optoelectronic Material and Technologies
- School of Chemistry
| | - Jiarui Xu
- PCFM Lab
- GD HPPC Lab
- Guangdong Engineering Technology Research Center for High-performance Organic and Polymer Photoelectric Functional Films
- State Key Laboratory of Optoelectronic Material and Technologies
- School of Chemistry
| | - Zhenguo Chi
- PCFM Lab
- GD HPPC Lab
- Guangdong Engineering Technology Research Center for High-performance Organic and Polymer Photoelectric Functional Films
- State Key Laboratory of Optoelectronic Material and Technologies
- School of Chemistry
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23
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Hu M, Liu Y, Chen Y, Song W, Gao L, Mu H, Huang J, Su J. Highly efficient triazine/carbazole-based host material for green phosphorescent organic light-emitting diodes with low efficiency roll-off. RSC Adv 2017. [DOI: 10.1039/c6ra27770e] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Two novel triazin/carbazole-based host materials were designed and synthesized, which demonstrated outstanding EL performance with maximum CE, PE and EQE of 69.3 cd A−1, 54.2 lm W−1 and 21.9%, respectively.
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Affiliation(s)
- Mingming Hu
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- East China University of Science & Technology
- Shanghai 200237
- PR China
| | - Yang Liu
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- East China University of Science & Technology
- Shanghai 200237
- PR China
| | - Yi Chen
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- East China University of Science & Technology
- Shanghai 200237
- PR China
| | - Wenxuan Song
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- East China University of Science & Technology
- Shanghai 200237
- PR China
| | - Lei Gao
- School of Chemistry and Chemical Engineering
- Queen's University
- Belfast
- UK
| | - Haichuan Mu
- Department of Physics
- School of Science
- East China University of Science and Technology
- Shanghai 200237
- PR China
| | - Jinhai Huang
- Shanghai Taoe Chemical Technology Co., Ltd
- Shanghai
- PR China
| | - Jianhua Su
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- East China University of Science & Technology
- Shanghai 200237
- PR China
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24
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Tang Y, Zhuang J, Xie L, Chen X, Zhang D, Hao J, Su W, Cui Z. Thermally Cross-Linkable Host Materials for Solution-Processed OLEDs: Synthesis, Characterization, and Optoelectronic Properties. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600407] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Yuanju Tang
- Printable Electronics Research Center; Suzhou Institute of Nano-Technology and Nano-Bionics; Chinese Academy of Sciences; 398 Ruoshui Road, Suzhou Industrial Park 215123 Suzhou Jiangsu P. R. China
- Department of Chemistry; Shanghai University; 99 Shangda Road 200444 Shanghai P. R. China
| | - Jinyong Zhuang
- Printable Electronics Research Center; Suzhou Institute of Nano-Technology and Nano-Bionics; Chinese Academy of Sciences; 398 Ruoshui Road, Suzhou Industrial Park 215123 Suzhou Jiangsu P. R. China
| | - Liming Xie
- Printable Electronics Research Center; Suzhou Institute of Nano-Technology and Nano-Bionics; Chinese Academy of Sciences; 398 Ruoshui Road, Suzhou Industrial Park 215123 Suzhou Jiangsu P. R. China
- Nano Science and Technology Institute; University of Science and Technology of China; 215123 Suzhou P. R. China
| | - Xiaolian Chen
- Printable Electronics Research Center; Suzhou Institute of Nano-Technology and Nano-Bionics; Chinese Academy of Sciences; 398 Ruoshui Road, Suzhou Industrial Park 215123 Suzhou Jiangsu P. R. China
| | - Dongyu Zhang
- Printable Electronics Research Center; Suzhou Institute of Nano-Technology and Nano-Bionics; Chinese Academy of Sciences; 398 Ruoshui Road, Suzhou Industrial Park 215123 Suzhou Jiangsu P. R. China
| | - Jian Hao
- Department of Chemistry; Shanghai University; 99 Shangda Road 200444 Shanghai P. R. China
| | - Wenming Su
- Printable Electronics Research Center; Suzhou Institute of Nano-Technology and Nano-Bionics; Chinese Academy of Sciences; 398 Ruoshui Road, Suzhou Industrial Park 215123 Suzhou Jiangsu P. R. China
| | - Zheng Cui
- Printable Electronics Research Center; Suzhou Institute of Nano-Technology and Nano-Bionics; Chinese Academy of Sciences; 398 Ruoshui Road, Suzhou Industrial Park 215123 Suzhou Jiangsu P. R. China
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25
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Zhang T, Xu DQ, Chen JM, Zhang P, Wang XC. Synthesis and characterization of carbazole-based dendrimers as bipolar host materials for green phosphorescent organic light emitting diodes. CHINESE CHEM LETT 2016. [DOI: 10.1016/j.cclet.2015.12.028] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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26
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Liao JL, Chi Y, Sie ZT, Ku CH, Chang CH, Fox MA, Low PJ, Tseng MR, Lee GH. Ir(III)-Based Phosphors with Bipyrazolate Ancillaries; Rational Design, Photophysics, and Applications in Organic Light-Emitting Diodes. Inorg Chem 2015; 54:10811-21. [DOI: 10.1021/acs.inorgchem.5b01835] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jia-Ling Liao
- Department
of Chemistry and Low Carbon Energy Research Center, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Yun Chi
- Department
of Chemistry and Low Carbon Energy Research Center, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Zong-Ting Sie
- Department of Photonics Engineering, Yuan Ze University, Chungli 32003, Taiwan
| | - Chia-Hao Ku
- Department of Photonics Engineering, Yuan Ze University, Chungli 32003, Taiwan
| | - Chih-Hao Chang
- Department of Photonics Engineering, Yuan Ze University, Chungli 32003, Taiwan
| | - Mark A. Fox
- Department of Chemistry, Durham University, South Road, Durham DH1
3LE, U.K
| | - Paul J. Low
- School of Chemistry and
Biochemistry, University of Western Australia, 35 Stirling Highway, Crawley 6009, Western Australia, Australia
| | - Meu-Rurng Tseng
- Material
and Chemical Research Laboratories, Industrial Technology Research Institute, Hsinchu 31040, Taiwan
| | - Gene-Hsiang Lee
- Instrumentation
Center, National Taiwan University, Taipei 10617, Taiwan
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27
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Yang X, Zhou G, Wong WY. Functionalization of phosphorescent emitters and their host materials by main-group elements for phosphorescent organic light-emitting devices. Chem Soc Rev 2015; 44:8484-575. [PMID: 26245654 DOI: 10.1039/c5cs00424a] [Citation(s) in RCA: 393] [Impact Index Per Article: 43.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Phosphorescent organic light-emitting devices (OLEDs) have attracted increased attention from both academic and industrial communities due to their potential practical application in high-resolution full-color displays and energy-saving solid-state lightings. The performance of phosphorescent OLEDs is mainly limited by the phosphorescent transition metal complexes (such as iridium(III), platinum(II), gold(III), ruthenium(II), copper(I) and osmium(II) complexes, etc.) which can play a crucial role in furnishing efficient energy transfer, balanced charge injection/transporting character and high quantum efficiency in the devices. It has been shown that functionalized main-group element (such as boron, silicon, nitrogen, phosphorus, oxygen, sulfur and fluorine, etc.) moieties can be incorporated into phosphorescent emitters and their host materials to tune their triplet energies, frontier molecular orbital energies, charge injection/transporting behavior, photophysical properties and thermal stability and hence bring about highly efficient phosphorescent OLEDs. So, in this review, the recent advances in the phosphorescent emitters and their host materials functionalized with various main-group moieties will be introduced from the point of view of their structure-property relationship. The main emphasis lies on the important role played by the main-group element groups in addressing the key issues of both phosphorescent emitters and their host materials to fulfill high-performance phosphorescent OLEDs.
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Affiliation(s)
- Xiaolong Yang
- MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, State Key Laboratory for Mechanical Behavior of Materials, Department of Chemistry, Faculty of Science, Xi'an Jiaotong University, Xi'an 710049, P. R. China.
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28
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Wang K, Wang S, Wei J, Miao Y, Zhang Z, Zhang Z, Liu Y, Wang Y. Structurally simple phenanthroimidazole-based bipolar hosts for high-performance green and red electroluminescent devices. RSC Adv 2015. [DOI: 10.1039/c5ra14570h] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Two structurally simple and easily synthesized phenanthroimidazole-based bipolar-transporting host materials realized efficient green and red phosphorescent OLEDs with low efficiency roll-off.
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Affiliation(s)
- Kai Wang
- State Key Laboratory of Supramolecular Structure and Materials
- College of Chemistry
- Jilin University
- Changchun 130012
- P. R. China
| | - Shipan Wang
- State Key Laboratory of Supramolecular Structure and Materials
- College of Chemistry
- Jilin University
- Changchun 130012
- P. R. China
| | - Jinbei Wei
- State Key Laboratory of Supramolecular Structure and Materials
- College of Chemistry
- Jilin University
- Changchun 130012
- P. R. China
| | - Yang Miao
- State Key Laboratory of Supramolecular Structure and Materials
- College of Chemistry
- Jilin University
- Changchun 130012
- P. R. China
| | - Zhenyu Zhang
- State Key Laboratory of Supramolecular Structure and Materials
- College of Chemistry
- Jilin University
- Changchun 130012
- P. R. China
| | - Zuolun Zhang
- State Key Laboratory of Supramolecular Structure and Materials
- College of Chemistry
- Jilin University
- Changchun 130012
- P. R. China
| | - Yu Liu
- State Key Laboratory of Supramolecular Structure and Materials
- College of Chemistry
- Jilin University
- Changchun 130012
- P. R. China
| | - Yue Wang
- State Key Laboratory of Supramolecular Structure and Materials
- College of Chemistry
- Jilin University
- Changchun 130012
- P. R. China
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29
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Bodedla GB, Justin Thomas KR, Kumar S, Jou JH, Li CJ. Phenothiazine-based bipolar green-emitters containing benzimidazole units: synthesis, photophysical and electroluminescence properties. RSC Adv 2015. [DOI: 10.1039/c5ra18372c] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
A series of bipolar green emitters bearing hole-transporting phenothiazine and electron-transporting N-phenylbenzimidazole are synthesized and characterized by their photophysical, electrochemical and thermal properties.
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Affiliation(s)
- Govardhana Babu Bodedla
- Organic Materials Chemistry
- Department of Chemistry
- Indian Institute of Technology Roorkee
- Roorkee 247667
- India
| | - K. R. Justin Thomas
- Organic Materials Chemistry
- Department of Chemistry
- Indian Institute of Technology Roorkee
- Roorkee 247667
- India
| | - Sandeep Kumar
- Organic Materials Chemistry
- Department of Chemistry
- Indian Institute of Technology Roorkee
- Roorkee 247667
- India
| | - Jwo-Huei Jou
- Department of Material Science and Engineering
- National Tsing Hua University
- Hsinchu 30013
- Taiwan
| | - Chieh-Ju Li
- Department of Material Science and Engineering
- National Tsing Hua University
- Hsinchu 30013
- Taiwan
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30
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Kim SM, Byeon SY, Hwang SH, Lee JY. Rational design of host materials for phosphorescent organic light-emitting diodes by modifying the 1-position of carbazole. Chem Commun (Camb) 2015; 51:10672-5. [DOI: 10.1039/c5cc02188j] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel carbazole moiety with bromine at the 1-position of carbazole was synthesized and four carbazole compounds derived from the 1-position modified carbazole were developed as the host materials for phosphorescent organic light-emitting diodes.
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Affiliation(s)
- Sung Moo Kim
- School of Chemical Engineering
- Sungkyunkwan University
- Suwon
- Republic of Korea
| | - Sung Yong Byeon
- Department of Polymer Science and Engineering
- Dankook University
- Yongin
- Republic of Korea
| | - Seok-Ho Hwang
- Department of Polymer Science and Engineering
- Dankook University
- Yongin
- Republic of Korea
| | - Jun Yeob Lee
- School of Chemical Engineering
- Sungkyunkwan University
- Suwon
- Republic of Korea
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31
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Ku HY, Tong B, Chi Y, Kao HC, Yeh CC, Chang CH, Lee GH. Luminescent Pt(ii) complexes bearing dual isoquinolinyl pyrazolates: fundamentals and applications. Dalton Trans 2015; 44:8552-63. [DOI: 10.1039/c4dt03028a] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Pt(ii) complex [Pt(Lx)2], LxH = 6-t-butyl-1-(3-trifluoromethyl-1H-pyrazol-5-yl) isoquinoline, with three colored morphologies can be interconverted by grinding and/or wetting with solvents.
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Affiliation(s)
- Hsiao-Yun Ku
- Department of Chemistry
- National Tsing Hua University
- Hsinchu 30013
- Taiwan
| | - Bihai Tong
- Department of Chemistry
- National Tsing Hua University
- Hsinchu 30013
- Taiwan
- College of Metallurgy and Resources
| | - Yun Chi
- Department of Chemistry
- National Tsing Hua University
- Hsinchu 30013
- Taiwan
| | - Hao-Che Kao
- Department of Photonics Engineering
- Yuan Ze University
- Chungli 32003
- Taiwan
| | - Chia-Chi Yeh
- Department of Photonics Engineering
- Yuan Ze University
- Chungli 32003
- Taiwan
| | - Chih-Hao Chang
- Department of Photonics Engineering
- Yuan Ze University
- Chungli 32003
- Taiwan
| | - Gene-Hsiang Lee
- Department of Chemistry and Instrumentation Center
- National Taiwan University
- Taipei 10617
- Taiwan
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32
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Xue F, Ma Y, Zhou Z, Qin L, Lu Y, Yang H, Yang S. Second-sphere coordination-induced morphology transformation from phosphorescent nanowires to microcubes. Dalton Trans 2015; 44:2970-2. [DOI: 10.1039/c4dt00640b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Nanowires of a pyridyl-functionalized iridium complex are transformed into microcubes as a result of hydrogen-bond-assisted second-sphere coordination between pyridyl groups and monovalent anions of 1,3,5-benzenetricarboxylic acid (H2BTC−).
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Affiliation(s)
- Fengfeng Xue
- The Education Ministry Key Lab of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials
- Shanghai Normal University
- Shanghai 200234
- China
| | - Yunsheng Ma
- School of Chemistry and Materials Engineering
- Jiangsu Key Laboratory of Advanced Functional Materials
- Changshu Insititute of Technology
- Changsu
- P. R. China
| | - Zhiguo Zhou
- The Education Ministry Key Lab of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials
- Shanghai Normal University
- Shanghai 200234
- China
| | - Lijie Qin
- The Education Ministry Key Lab of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials
- Shanghai Normal University
- Shanghai 200234
- China
| | - Yang Lu
- The Education Ministry Key Lab of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials
- Shanghai Normal University
- Shanghai 200234
- China
| | - Hong Yang
- The Education Ministry Key Lab of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials
- Shanghai Normal University
- Shanghai 200234
- China
| | - Shiping Yang
- The Education Ministry Key Lab of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials
- Shanghai Normal University
- Shanghai 200234
- China
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33
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Chen S, Wu Y, Zhao Y, Fang D. Deep blue organic light-emitting devices enabled by bipolar phenanthro[9,10-d]imidazole derivatives. RSC Adv 2015. [DOI: 10.1039/c5ra13814k] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Novel phenanthroimidazole derivatives with D–π–A structures have been successfully designed and prepared. Non-doped organic light emitting diodes (OLEDs) were fabricated by employing the compounds, which display deep blue emission.
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Affiliation(s)
- Shuo Chen
- State Key Laboratory for Turbulence and Complex System
- College of Engineering
- Peking University
- Beijing 100871
- P. R. China
| | - Yukun Wu
- State Key Laboratory on Integrated Optoelectronics
- College of Electronics Science and Engineering
- Jilin University
- Changchun 130012
- P. R. China
| | - Yi Zhao
- State Key Laboratory on Integrated Optoelectronics
- College of Electronics Science and Engineering
- Jilin University
- Changchun 130012
- P. R. China
| | - Daining Fang
- State Key Laboratory for Turbulence and Complex System
- College of Engineering
- Peking University
- Beijing 100871
- P. R. China
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34
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Tao Y, Yuan K, Chen T, Xu P, Li H, Chen R, Zheng C, Zhang L, Huang W. Thermally activated delayed fluorescence materials towards the breakthrough of organoelectronics. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2014; 26:7931-58. [PMID: 25230116 DOI: 10.1002/adma.201402532] [Citation(s) in RCA: 817] [Impact Index Per Article: 81.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2014] [Revised: 07/11/2014] [Indexed: 05/27/2023]
Abstract
The design and characterization of thermally activated delayed fluorescence (TADF) materials for optoelectronic applications represents an active area of recent research in organoelectronics. Noble metal-free TADF molecules offer unique optical and electronic properties arising from the efficient transition and interconversion between the lowest singlet (S1 ) and triplet (T1 ) excited states. Their ability to harvest triplet excitons for fluorescence through facilitated reverse intersystem crossing (T1 →S1 ) could directly impact their properties and performances, which is attractive for a wide variety of low-cost optoelectronic devices. TADF-based organic light-emitting diodes, oxygen, and temperature sensors show significantly upgraded device performances that are comparable to the ones of traditional rare-metal complexes. Here we present an overview of the quick development in TADF mechanisms, materials, and applications. Fundamental principles on design strategies of TADF materials and the common relationship between the molecular structures and optoelectronic properties for diverse research topics and a survey of recent progress in the development of TADF materials, with a particular emphasis on their different types of metal-organic complexes, D-A molecules, and fullerenes, are highlighted. The success in the breakthrough of the theoretical and technical challenges that arise in developing high-performance TADF materials may pave the way to shape the future of organoelectronics.
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Affiliation(s)
- Ye Tao
- Key Laboratory for Organic Electronics and Information Displays (KLOEID), Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications, Nanjing, 210023, China
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Cho MJ, Kim SJ, Yoon SH, Shin J, Hong TR, Kim HJ, Son YH, Kang JS, Um HA, Lee TW, Bin JK, Lee BS, Yang JH, Chae GS, Kwon JH, Choi DH. New bipolar host materials for realizing blue phosphorescent organic light-emitting diodes with high efficiency at 1000 cd/m2. ACS APPLIED MATERIALS & INTERFACES 2014; 6:19808-19815. [PMID: 25370737 DOI: 10.1021/am505049h] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
New host molecules such as 9-(6-(9H-carbazol-9-yl)pyridin-3-yl)-6-(9H-carbazol-9-yl)-9H-pyrido[2,3-b]indole (pPCB2CZ) and 9-(6-(9H-carbazol-9-yl)pyridin-2-yl)-6-(9H-carbazol-9-yl)-9H-pyrido[2,3-b]indole (mPCB2CZ) were designed and synthesized for blue phosphorescent organic light-emitting diodes (PhOLEDs). The glass transition temperatures of two host molecules were measured higher than 120 °C, and the identical triplet energies were determined to be 2.92 eV for both molecules. The bis(3,5-difluoro-2-(2-pyridyl)phenyl-(2-carboxypyridyl)iridium(III) (FIrpic)-doped mPCB2CZ-based PhOLED exhibited practically useful driving voltage of 4.8 V in a simple organic three layer device configuration which has a smaller number of interfaces in conventional multilayer PhOLEDs. Also, the high quantum efficiency of 23.7% is reported at the practically useful brightness value of 1000 cd/m2.
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Affiliation(s)
- Min Ju Cho
- Department of Chemistry, Research Institute for Natural Sciences, Korea University , 5 Anam-dong, Sungbuk-Gu, Seoul 136-701, Republic of Korea
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Lu Y, Xue F, Zhou Z, Shi M, Yan Y, Qin L, Yang H, Yang S. Phosphorescent Polymeric Nanoparticles by Coordination Cross-Linking as a Platform for Luminescence Imaging and Photodynamic Therapy. Chemistry 2014; 20:16242-7. [DOI: 10.1002/chem.201404346] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2014] [Indexed: 01/06/2023]
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Hung WY, Fang GC, Lin SW, Cheng SH, Wong KT, Kuo TY, Chou PT. The first tandem, all-exciplex-based WOLED. Sci Rep 2014; 4:5161. [PMID: 24895098 PMCID: PMC4044637 DOI: 10.1038/srep05161] [Citation(s) in RCA: 75] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2014] [Accepted: 05/06/2014] [Indexed: 12/22/2022] Open
Abstract
Exploiting our recently developed bilayer interface methodology, together with a new wide energy-gap, low LUMO acceptor (A) and the designated donor (D) layers, we succeeded in fabricating an exciplex-based organic light-emitting diode (OLED) systematically tuned from blue to red. Further optimization rendered a record-high blue exciplex OLED with ηext of 8%. We then constructed a device structure configured by two parallel blend layers of mCP/PO-T2T and DTAF/PO-T2T, generating blue and yellow exciplex emission, respectively. The resulting device demonstrates for the first time a tandem, all-exciplex-based white-light OLED (WOLED) with excellent efficiencies ηext: 11.6%, ηc: 27.7 cd A−1, and ηp: 15.8 ml W−1 with CIE(0.29, 0.35) and CRI 70.6 that are nearly independent of EL intensity. The tandem architecture and blend-layer D/A (1:1) configuration are two key elements that fully utilize the exciplex delay fluorescence, providing a paragon for the use of low-cost, abundant organic compounds en route to commercial WOLEDs.
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Affiliation(s)
- Wen-Yi Hung
- Institute of Optoelectronic Sciences, National Taiwan Ocean University, Keelung, 20224, Taiwan
| | - Guan-Cheng Fang
- Institute of Optoelectronic Sciences, National Taiwan Ocean University, Keelung, 20224, Taiwan
| | - Shih-Wei Lin
- Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan
| | - Shuo-Hsien Cheng
- Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan
| | - Ken-Tsung Wong
- 1] Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan [2] Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, 10617, Taiwan
| | - Ting-Yi Kuo
- Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan
| | - Pi-Tai Chou
- 1] Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan [2] Center for Emerging Material and Advanced Devices, National Taiwan University, Taipei, 10617, Taiwan
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Xue F, Lu Y, Zhou Z, Zhang C, Fang S, Yang H, Yang S. Synthesis, crystal structure, and application as a Ag+ chemodosimeter of phosphorescent iridium complexes. J COORD CHEM 2014. [DOI: 10.1080/00958972.2014.913136] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Fengfeng Xue
- The Education Ministry Key Lab of Resource Chemistry & Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai, PR China
| | - Yang Lu
- The Education Ministry Key Lab of Resource Chemistry & Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai, PR China
| | - Zhiguo Zhou
- The Education Ministry Key Lab of Resource Chemistry & Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai, PR China
| | - Chen Zhang
- The Education Ministry Key Lab of Resource Chemistry & Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai, PR China
| | - Shichao Fang
- The Education Ministry Key Lab of Resource Chemistry & Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai, PR China
| | - Hong Yang
- The Education Ministry Key Lab of Resource Chemistry & Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai, PR China
| | - Shiping Yang
- The Education Ministry Key Lab of Resource Chemistry & Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai, PR China
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Zhuang J, Li W, Su W, Zhou M, Cui Z. Novel ternary bipolar host material with carbazole, triazole and phosphine oxide moieties for high efficiency sky-blue OLEDs. NEW J CHEM 2014. [DOI: 10.1039/c3nj01054f] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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40
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Chang CH, Wu ZJ, Chiu CH, Liang YH, Tsai YS, Liao JL, Chi Y, Hsieh HY, Kuo TY, Lee GH, Pan HA, Chou PT, Lin JS, Tseng MR. A new class of sky-blue-emitting Ir(III) phosphors assembled using fluorine-free pyridyl pyrimidine cyclometalates: application toward high-performance sky-blue- and white-emitting OLEDs. ACS APPLIED MATERIALS & INTERFACES 2013; 5:7341-7351. [PMID: 23863090 DOI: 10.1021/am401694s] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Two pyrimidine chelates with the pyridin-2-yl group residing at either the 5- or 4-positions are synthesized. These chelates are then utilized in synthesizing of a new class of heteroleptic Ir(III) metal complexes, namely [Ir(b5ppm)2(fppz)] (1), [Ir(b5bpm)2(fppz)] (2), [Ir(b4bpm)2(fppz)] (3), and [Ir(b5bpm)(fppz)2] (4), for which the abbreviations b5ppm, b5bpm, b4bpm, and fppz represent chelates derived from 2-t-butyl-5-(pyridin-2-yl)pyrimidine, 2-t-butyl-5-(4-t-butylpyridin-2-yl)pyrimidine, 2-t-butyl-4-(4-t-butylpyridin-2-yl)pyrimidine, and 3-trifluoromethyl-5-(pyridin-2-yl) pyrazole, respectively. The single crystal X-ray structural analyses were executed on 1 to reveal their coordination arrangement around the Ir(III) metal element. The 5-substituted pyrimidine complexes 1, 2, and 4 exhibited the first emission peak wavelength (λmax) located in the range 452-457 nm with high quantum yields, whereas the emission of 3 with 4-substituted pyrimidine was red-shifted substantially to longer wavelength with λmax = 535 nm. These photophysical properties were discussed under the basis of computational approaches, particularly the relationship between emission color and the relative position of nitrogen atoms of pyrimidine fragment. For application, organic light-emitting diodes (OLEDs) were also fabricated using 2 and 4 as dopants, attaining the peak external quantum, luminance, and power efficiencies of 17.9% (38.0 cd/A and 35.8 lm/W) and 15.8% (30.6 cd/A and 24.8 lm/W), respectively. Combining sky blue-emitting 2 and red-emitting [Os(bpftz)2(PPh2Me)2] (5), the phosphorescent white OLEDs were demonstrated with stable pure-white emission at CIE coordinate of (0.33, 0.34), and peak luminance efficiency of 35.3 cd/A, power efficiency of 30.4 lm/W, and external quantum efficiency up to 17.3%.
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Affiliation(s)
- Chih-Hao Chang
- Department of Photonics Engineering, Yuan Ze University, Chung-Li 32003, Taiwan.
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Serevičius T, Nakagawa T, Kuo MC, Cheng SH, Wong KT, Chang CH, Kwong RC, Xia S, Adachi C. Enhanced electroluminescence based on thermally activated delayed fluorescence from a carbazole-triazine derivative. Phys Chem Chem Phys 2013; 15:15850-5. [PMID: 23907636 DOI: 10.1039/c3cp52255e] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Thermally activated delayed fluorescence (TADF) properties of a dicarbazole-triazine compound, 9-(4,6-diphenyl-1,3,5-triazin-2-yl)-9'-phenyl-3,3'-bicarbazole (CzT), and its OLED characteristics were investigated. An estimated small energy gap of about 90 meV between the singlet and triplet energy states of CzT made the up-conversion of triplet excitons back to a singlet state possible. The origin of the observed delayed fluorescence has been shown to be thermally activated delayed fluorescence. An organic light emitting diode (OLED) with CzT as an emitter showed the maximum external quantum efficiency (EQE) of 6%. For comparison, another carbazole-triazine derivative of 3-(2'-(4,6-diphenyl-1,3,5-triazin-2-yl)-[1,1'-biphenyl]-2-yl)-9-phenyl-9H-carbazole (PhCzTAZ) with a similar structure was also studied. PhCzTAZ showed a low fluorescence quantum yield with no TADF.
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Affiliation(s)
- Tomas Serevičius
- Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan.
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