中国科学院长春光学精密机械与物理研究所

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	Highly efficient non-doped deep-blue organic light-emitting diodes based on pyreneimidazole derivative with external quantum efficiency > 11% and negligible efficiency roll-off
	Z. Cheng, C. Y. Du, S. Y. Ge, Y. X. Wang, F. T. Liu, Y. L. Chang, Y. Lv and P. Lu
	2023
发表期刊	Chemical Engineering Journal
ISSN	1385-8947
卷号	474页码:9
摘要	The development of highly efficient deep-blue fluorescent materials applicable in non-doped organic lightemitting diodes (OLEDs) is still an appealing yet challenging task. Herein, we present a rational design of deep-blue material, PyPO, by linking pyreneimidazole (PyI) moiety with diphenyl ether unit through a benzene bridge. A weak charge transfer state between PyI and diphenyl ether in PyPO is observed from the photophysical investigation, and it is provided with the hybridized local and charge transfer (HLCT) feature as indicated by theoretical calculations. The neat thin film of PyPO shows high photoluminescence quantum yield (PLQY) of 70.7% and excellent horizontal dipole ratio of 84.0%, respectively. In particular, the non-doped OLED using PyPO as the active layer exhibits an electroluminescent (EL) emission peak at 448 nm with an impressive maximum external quantum efficiency (EQE) of 11.1% and negligible roll-off at 1000 cd m(-2), which is one of the best results among PyI-based deep-blue luminogens. In addition, the red phosphorescent OLED applying PyPO as host achieves a maximum EQE of 31.3% and still remains 28.6% at 1000 cd m(-2), demonstrating PyPO is also a suitable phosphorescent host material. The excellent device performance is ascribed to the high-lying reversed intersystem crossing (hRISC) via hot exciton mechanism. These findings may provide new insights for the development of highly efficient deep-blue emitters.
DOI	10.1016/j.cej.2023.145867
URL	查看原文
收录类别	sci ; ei
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/67405
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	Z. Cheng, C. Y. Du, S. Y. Ge, Y. X. Wang, F. T. Liu, Y. L. Chang, Y. Lv and P. Lu. Highly efficient non-doped deep-blue organic light-emitting diodes based on pyreneimidazole derivative with external quantum efficiency > 11% and negligible efficiency roll-off[J]. Chemical Engineering Journal,2023,474:9.
APA	Z. Cheng, C. Y. Du, S. Y. Ge, Y. X. Wang, F. T. Liu, Y. L. Chang, Y. Lv and P. Lu.(2023).Highly efficient non-doped deep-blue organic light-emitting diodes based on pyreneimidazole derivative with external quantum efficiency > 11% and negligible efficiency roll-off.Chemical Engineering Journal,474,9.
MLA	Z. Cheng, C. Y. Du, S. Y. Ge, Y. X. Wang, F. T. Liu, Y. L. Chang, Y. Lv and P. Lu."Highly efficient non-doped deep-blue organic light-emitting diodes based on pyreneimidazole derivative with external quantum efficiency > 11% and negligible efficiency roll-off".Chemical Engineering Journal 474(2023):9.

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