High-efficiency non-doped deep-blue fluorescent organic light-emitting diodes based on carbazole/phenanthroimidazole derivatives

Jianhui Xin; Zhiqiang Li; Yijun Liu; Dan Liu; Feng Zhu; Yue Wang; Donghang Yan

doi:10.1039/D0TC02594A

High-efficiency non-doped deep-blue fluorescent organic light-emitting diodes based on carbazole/phenanthroimidazole derivatives†

Jianhui Xin,

‡^ab Zhiqiang Li,

‡^c Yijun Liu,^ab Dan Liu,^ab Feng Zhu,

*^ab Yue Wang

*^c and Donghang Yan^ab

Author affiliations

* Corresponding authors

^a State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
E-mail: zhufeng@ciac.ac.cn

^b School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei 230026, China

^c State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, China
E-mail: yuewang@jlu.edu.cn

Abstract

It is a persistent challenge to develop efficient, low roll-off, pure blue light emitting materials. Here, employing rigid carbazole (Cz) and phenyl-phenanthroimidazole (PPI) moieties to reduce the energy loss caused by non-radiative transitions, two deep-blue fluorescent emitting materials, 2-(4-(9H-carbazol-9-yl)phenyl)-1-(3,5-difluorophenyl)-1H-phenanthro[9,10-d]imidazole (2FPPICz) and 2-(4′-(9H-carbazol-9-yl)-[1,1′-biphenyl]-4-yl)-1-(3,5-difluorophenyl)-1H-phenanthro[9,10-d]imidazole (2FPPIPCz), are synthesized and fully characterized. The non-doped organic light-emitting diodes (OLEDs) with 2FPPICz and 2FPPIPCz as emitters represent deep-blue emission with Commission International de L’Éclairage (CIE) coordinates of (0.160, 0.045) and (0.150, 0.075) and an excellent maximum external quantum efficiency (EQE) of 4.3% and 5.6%, respectively. Furthermore, the OLED with 2FPPIPCz exhibits low efficiency roll-off at high luminance.

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DOI: https://doi.org/10.1039/D0TC02594A
Article type: Communication
Submitted: 31 May 2020
Accepted: 12 Jul 2020
First published: 14 Jul 2020

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J. Mater. Chem. C, 2020,8, 10185-10190

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High-efficiency non-doped deep-blue fluorescent organic light-emitting diodes based on carbazole/phenanthroimidazole derivatives

J. Xin, Z. Li, Y. Liu, D. Liu, F. Zhu, Y. Wang and D. Yan, J. Mater. Chem. C, 2020, 8, 10185 DOI: 10.1039/D0TC02594A

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Journal of Materials Chemistry C

High-efficiency non-doped deep-blue fluorescent organic light-emitting diodes based on carbazole/phenanthroimidazole derivatives†

Abstract

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High-efficiency non-doped deep-blue fluorescent organic light-emitting diodes based on carbazole/phenanthroimidazole derivatives

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