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Wang RJ, Zheng F, Liu XL, Wu YL, Jin JM, Li ZY, Chen WC, Huo Y. A through-space charge transfer pyrene-based fluorophore with anti-quenching behavior for deep-blue organic light-emitting devices. Chem Commun (Camb) 2024; 60:7946-7949. [PMID: 38984894 DOI: 10.1039/d4cc02880e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/11/2024]
Abstract
A through-space charge transfer pyrene-based fluorophore has been developed for organic light-emitting devices (OLEDs). This material exhibits deep-blue fluorescence, bipolar characteristics, and anti-quenching behavior in the solid state. It proves to be an effective emitter for both doped and nondoped deep-blue OLEDs.
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Affiliation(s)
- Ru-Jia Wang
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, P. R. China.
- Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center, Jieyang, P. R. China
| | - Fan Zheng
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, P. R. China.
- Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center, Jieyang, P. R. China
| | - Xiao-Long Liu
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, P. R. China.
- Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center, Jieyang, P. R. China
| | - Yu-Lan Wu
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, P. R. China.
- Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center, Jieyang, P. R. China
| | - Jia-Ming Jin
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, P. R. China.
- Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center, Jieyang, P. R. China
| | - Ze-Yan Li
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, P. R. China.
- Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center, Jieyang, P. R. China
| | - Wen-Cheng Chen
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, P. R. China.
- Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center, Jieyang, P. R. China
| | - Yanping Huo
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, P. R. China.
- Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center, Jieyang, P. R. China
- Analytical & Testing Center, Guangdong University of Technology, Guangzhou, P. R. China
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Chen WC, Liu XL, Liu Q, Zheng F, Xing L, Wu QE, Lian ZX, Zheng PY, Zhang Y, Ji S, Huo Y. A new dicyanophenanthrene-based thermally activated delayed fluorophore: Design, synthesis, photophysical study, and electroluminescence application. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2024; 322:124808. [PMID: 39024786 DOI: 10.1016/j.saa.2024.124808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2024] [Revised: 06/27/2024] [Accepted: 07/09/2024] [Indexed: 07/20/2024]
Abstract
A novel thermally activated delayed fluorescence (TADF) emitter, DCNP-SCF, is developed based on a dicyanophenanthrene acceptor. DCNP-SCF is prepared by a simple C-N coupling reaction. Its thermal, theoretical, photophysical, and electroluminescent properties are investigated, emphasizing its potential in organic electroluminescence devices. DCNP-SCF demonstrates highly distorted donor-acceptor conformation, facilitating significant TADF for efficient triplet harvesting in electroluminescence devices. Additionally, due to the moderate electron push-pull effect, DCNP-SCF exhibits appropriate intramolecular charge transfer for considerable photoluminescence quantum yield for electroluminescence applications.
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Affiliation(s)
- Wen-Cheng Chen
- Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center, Jieyang, PR China; School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, PR China.
| | - Xiao-Long Liu
- Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center, Jieyang, PR China; School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, PR China
| | - Qiang Liu
- Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center, Jieyang, PR China; School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, PR China
| | - Fan Zheng
- Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center, Jieyang, PR China; School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, PR China
| | - Longjiang Xing
- Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center, Jieyang, PR China; School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, PR China
| | - Qiao-Er Wu
- Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center, Jieyang, PR China; School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, PR China
| | - Zi-Xian Lian
- Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center, Jieyang, PR China; School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, PR China
| | - Pei-Yan Zheng
- Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center, Jieyang, PR China; School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, PR China
| | - Yuzhen Zhang
- School of Chemistry and Chemical Engineering, Guangxi Minzu University, Nanning, PR China
| | - Shaomin Ji
- Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center, Jieyang, PR China; School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, PR China
| | - Yanping Huo
- Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center, Jieyang, PR China; School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, PR China; Analytical & Testing Center, Guangdong University of Technology, Guangzhou, PR China.
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Jin JM, Liu D, Chen WC, Shi C, Chen G, Wang X, Xing L, Ying W, Ji S, Huo Y, Su SJ. Synergetic Modulation of Steric Hindrance and Excited State for Anti-Quenching and Fast Spin-Flip Multi-Resonance Thermally Activated Delayed Fluorophore. Angew Chem Int Ed Engl 2024; 63:e202401120. [PMID: 38326521 DOI: 10.1002/anie.202401120] [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: 01/16/2024] [Revised: 02/05/2024] [Accepted: 02/06/2024] [Indexed: 02/09/2024]
Abstract
Multi-resonance thermally activated delayed fluorescence (MR-TADF) materials hold great promise for advanced high-resolution organic light-emitting diode (OLED) displays. However, persistent challenges, such as severe aggregation-caused quenching (ACQ) and slow spin-flip, hinder their optimal performance. We propose a synergetic steric-hindrance and excited-state modulation strategy for MR-TADF emitters, which is demonstrated by two blue MR-TADF emitters, IDAD-BNCz and TIDAD-BNCz, bearing sterically demanding 8,8-diphenyl-8H-indolo[3,2,1-de]acridine (IDAD) and 3,6-di-tert-butyl-8,8-diphenyl-8H-indolo[3,2,1-de]acridine (TIDAD), respectively. These rigid and bulky IDAD/TIDAD moieties, with appropriate electron-donating capabilities, not only effectively mitigate ACQ, ensuring efficient luminescence across a broad range of dopant concentrations, but also induce high-lying charge-transfer excited states that facilitate triplet-to-singlet spin-flip without causing undesired emission redshift or spectral broadening. Consequently, implementation of a high doping level of IDAD-BNCz resulted in highly efficient narrowband electroluminescence, featuring a remarkable full-width at half-maximum of 34 nm and record-setting external quantum efficiencies of 34.3 % and 31.8 % at maximum and 100 cd m-2, respectively. The combined steric and electronic effects arising from the steric-hindered donor introduction offer a compelling molecular design strategy to overcome critical challenges in MR-TADF emitters.
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Affiliation(s)
- Jia-Ming Jin
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, 510006, Guangzhou, P. R. China
| | - Denghui Liu
- State Key Laboratory of Luminescent Materials and Devices and Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology, 510640, Guangzhou, P. R. China
| | - Wen-Cheng Chen
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, 510006, Guangzhou, P. R. China
- Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center, 515200, Jieyang, P. R. China
| | - Chengxiang Shi
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, 510006, Guangzhou, P. R. China
| | - Guowei Chen
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, 510006, Guangzhou, P. R. China
| | - Xiaofeng Wang
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, 510006, Guangzhou, P. R. China
| | - Longjiang Xing
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, 510006, Guangzhou, P. R. China
| | - Weidong Ying
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, 510006, Guangzhou, P. R. China
| | - Shaomin Ji
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, 510006, Guangzhou, P. R. China
- Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center, 515200, Jieyang, P. R. China
| | - Yanping Huo
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, 510006, Guangzhou, P. R. China
- Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center, 515200, Jieyang, P. R. China
- Analytical & Testing Center, Guangdong University of Technology, 510006, Guangzhou, P. R. China
| | - Shi-Jian Su
- State Key Laboratory of Luminescent Materials and Devices and Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology, 510640, Guangzhou, P. R. China
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Wang J, Yang Y, Gu F, Zhai X, Yao C, Zhang J, Jiang C, Xi X. Molecular Engineering Modulating the Singlet-Triplet Energy Splitting of Indolocarbazole-Based TADF Emitters Exhibiting AIE Properties for Nondoped Blue OLEDs with EQE of Nearly 20. ACS APPLIED MATERIALS & INTERFACES 2023; 15:59643-59654. [PMID: 38090754 DOI: 10.1021/acsami.3c14230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2023]
Abstract
The development of efficient blue thermally activated delayed fluorescence (TADF) emitters with an aggregation-induced emission (AIE) nature, for the construction of organic light-emitting diodes (OLEDs), is still insufficient. This can be attributed to the challenges encountered in molecular design, including the inherent trade-off between radiative decay and reverse intersystem crossing (RISC), as well as small singlet-triplet energy splitting (ΔEST) and the requirement for high photoluminescence quantum yields (ΦPL). Herein, we present the design of three highly efficient blue TADF molecules with AIE characteristics by combining π-extended donors with different acceptors to modulate the differences in the electron-donating and electron-withdrawing abilities. This approach not only ensures high emission efficiency by suppressing close π-π stacking, weakening nonradiative relaxation, and enhancing radiative transition but also maintains the equilibrium ratio between the triplet and singlet excitons by facilitating the process of RISC. These emitters exhibit AIE and TADF properties, featuring quick radiative rates and low nonradiative rates. The ΦPL of these emitters reached an impressive 88%. Based on their excellent comprehensive performance, nondoped PICzPMO and PICzPMO OLEDs achieved excellent electroluminescence performance, exhibiting maximum external quantum efficiency (EQEmax) of up to 19.5%, while the doped device achieved a higher EQEmax of 20.8%. This work demonstrated that by fusing π-extended large rigid donors with different acceptors, it is possible to regulate the difference in electron-donating and electron-withdrawing abilities, resulting in a small ΔEST, high ΦPL, and fast RISC process, which is a highly feasible strategy for designing efficient TADF molecules.
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Affiliation(s)
- Jinshan Wang
- Jiangsu Provincial Key Laboratory of Eco-Environmental Materials, School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China
| | - Yuguang Yang
- Jiangsu Provincial Key Laboratory of Eco-Environmental Materials, School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China
| | - Fei Gu
- Jiangsu Provincial Key Laboratory of Eco-Environmental Materials, School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China
| | - Xuesong Zhai
- Jiangsu Provincial Key Laboratory of Eco-Environmental Materials, School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China
| | - Chuang Yao
- Chongqing Key Laboratory of Extraordinary Bond Engineering and Advance Materials Technology (EBEAM), Yangtze Normal University, Chongqing 408100, China
| | - Jianfeng Zhang
- School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Cuifeng Jiang
- Jiangsu Provincial Key Laboratory of Eco-Environmental Materials, School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China
| | - Xinguo Xi
- Jiangsu Provincial Key Laboratory of Eco-Environmental Materials, School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China
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