Benzene-cored AIEgens for deep-blue OLEDs: high performance without hole-transporting layers, and unexpected excellent host for orange emission as a side-effect

Chemical Science
Xuejun ZhanZhen Li

Abstract

Great efforts have been devoted to explore efficient fluorescent materials, especially deep-blue luminogens, for organic light emitting diodes (OLEDs). In this paper, according to the design idea of creating luminogens with the characteristic of aggregation induced emission (AIE), four new benzene-cored luminogens with very simple structure have been intelligently designed, in which, without an additional hole-transporting layer (such as NPB), 3TPA-CN exhibited deep-blue emission and high performance in a simple nondoped LED device with a current efficiency (CE) of 5.21 cd A-1, external quantum efficiency (EQE) of 3.89%, and CIE coordinates of (0.15, 0.14). Excitingly, as a wonderful side-effect, 3TPA-CN can serve as an excellent host for orange emissive phosphorescent OLEDs (PhOLEDs), with a maximum current and power efficiency of 57.4 cd A-1 and 52.0 lm W-1, respectively, and a corresponding maximum EQE of 18.2%, higher than that of CBP (15.7%), one popular host for orange PhOLEDs, under the same conditions, thus broadening the utilization of AIEgens as host in PhOLEDs.

References

Sep 21, 2002·Chemical Communications : Chem Comm·J LuoB Z Tang
Oct 27, 2010·Advanced Materials·Malte C GatherKlaus Meerholz
Mar 26, 2011·Chemical Society Reviews·Gianluca M Farinola, Roberta Ragni
Aug 31, 2012·Journal of the American Chemical Society·Qisheng ZhangChihaya Adachi
Dec 14, 2012·Nature·Hiroki UoyamaChihaya Adachi
Oct 23, 2015·Chemical Reviews·Ju MeiBen Zhong Tang

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Citations

Oct 13, 2018·Chemical Record : an Official Publication of the Chemical Society of Japan ... [et Al.]·Mengying BianLixin Xiao
Mar 20, 2020·Research : a Science Partner Journal·Xuejun ZhanZhen Li
Aug 14, 2018·Chemical Communications : Chem Comm·Lan YangYixiang Cheng
Dec 3, 2016·Faraday Discussions·Yuancheng WangBen Zhong Tang
Oct 30, 2020·Chemical Communications : Chem Comm·Mingzhu HuangShuai Chang

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Methods Mentioned

BETA
column chromatography
differential scanning calorimetry
phosphorescence

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