Triplet decay-induced negative temperature dependence of the transient photoluminescence decay of thermally activated delayed fluorescence emitter

doi:10.1039/c7tc04025c

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	Triplet decay-induced negative temperature dependence of the transient photoluminescence decay of thermally activated delayed fluorescence emitter
	Wei, Xiaofang 1,3; Chen, Yongzhen 1,3; Duan, Ruihong 2,3; Liu, Jianjun 1,3; Wang, Ruifang 1,3; Liu, Yanwei 1,3; Li, Zhiyi 1,3; Yi, Yuanping 2; Yamada-Takamura, Yukiko 4; Wang, Pengfei 1,3
刊名	JOURNAL OF MATERIALS CHEMISTRY C
	2017-12-14
卷号	5 期号:46 页码:12077-12084
ISSN号	2050-7526
DOI	10.1039/c7tc04025c
英文摘要	The photophysical properties of three TX-based D-A isomers (TXO-PhCz1, TXO-PhCz3, and TXO-PhCz4) with a PhCz donor at different substitution positions of phenyl group on a TXO unit were investigated. The substitution position of the PhCz unit significantly impacts the photophysical properties of these isomers. TXO-PhCz1 exhibits a very weak emission in both undoped and doped films, while TXO-PhCz3 and TXO-PhCz4 exhibit a strong emission with the requisite properties for TADF emitters, including a small Delta E-ST and transient PL decay curves with a prompt and delayed fluorescent component. TXO-PhCz4 exhibits a much stronger orbital coupling than TXO-PhCz3 and then the phosphorescent emission causes the inverse temperature dependence of the transient PL decay, which is contrary to that of TXO-PhCz3 and other TADF emitters. TXO-PhCz4 exhibits a small Delta E-ST of 23 meV and a short decay time of 14 mu s at room temperature, which are much smaller and shorter than those of TXO-PhCz3. Multilayer OLEDs based on TXO-PhCz4 exhibit a very low-efficiency roll-off with a maximum current efficiency of 49.2 cd A(-1), a maximum power efficiency of 47.7 lm W-1, and a maximum EQE of 16.3%.
语种	英语
出版者	ROYAL SOC CHEMISTRY
WOS记录号	WOS:000416540600011
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/45111]
专题	中国科学院化学研究所
通讯作者	Yi, Yuanping; Wang, Ying
作者单位	1.Chinese Acad Sci, Tech Inst Phys & Chem, Key Lab Photochem Convers & Optoelect Mat, Beijing 100190, Peoples R China 2.Chinese Acad Sci, Inst Chem, Key Lab Organ Solids, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Japan Adv Inst Sci & Technol, Sch Mat Sci, Nomi, Ishikawa 9231292, Japan
推荐引用方式 GB/T 7714	Wei, Xiaofang,Chen, Yongzhen,Duan, Ruihong,et al. Triplet decay-induced negative temperature dependence of the transient photoluminescence decay of thermally activated delayed fluorescence emitter[J]. JOURNAL OF MATERIALS CHEMISTRY C,2017,5(46):12077-12084.
APA	Wei, Xiaofang.,Chen, Yongzhen.,Duan, Ruihong.,Liu, Jianjun.,Wang, Ruifang.,...&Wang, Ying.(2017).Triplet decay-induced negative temperature dependence of the transient photoluminescence decay of thermally activated delayed fluorescence emitter.JOURNAL OF MATERIALS CHEMISTRY C,5(46),12077-12084.
MLA	Wei, Xiaofang,et al."Triplet decay-induced negative temperature dependence of the transient photoluminescence decay of thermally activated delayed fluorescence emitter".JOURNAL OF MATERIALS CHEMISTRY C 5.46(2017):12077-12084.