Acquiring High-Performance Deep-Blue OLED Emitters through an Unexpected Blueshift Color-Tuning Effect Induced by Electron-Donating -OMe Substituents

被引:39
作者
Peng, Song [1 ]
Zhao, Yihuan [1 ]
Fu, Caixia [1 ]
Pu, Xuemei [1 ]
Zhou, Liang [2 ]
Huang, Yan [1 ]
Lu, Zhiyun [1 ]
机构
[1] Sichuan Univ, Coll Chem, Minist Educ, Key Lab Green Chem & Technol, Chengdu 610064, Sichuan, Peoples R China
[2] Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Rare Earth Resource Utilizat, Changchun 130022, Jilin, Peoples R China
基金
中国国家自然科学基金;
关键词
color-tuning; coumarin; deep-blue fluorescence; OLED; substituent effects; ACTIVATED DELAYED FLUORESCENCE; LIGHT-EMITTING-DIODES; AGGREGATION-INDUCED EMISSION; EFFICIENCY ROLL-OFF; MOLECULAR DESIGN; PHOSPHINE OXIDE; UP-CONVERSION; ACCEPTOR; FLUOROPHORES; SINGLET;
D O I
10.1002/chem.201800974
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A series of blue-emissive 7-(diphenylamino)-4-phenoxycoumarin derivatives bearing -CF3, -OMe, or -N(Me)(2) substituents on the phenoxy subunit were synthesized. Although both the -CF3 and -N(Me)(2) modifications were found to trigger redshifted fluorescence, the -OMe substitution was demonstrated to exert an unexpected blueshift color-tuning effect toward the deep-blue region. The reason is that the moderate electron-donating -OMe group can endow coumarins with unaltered HOMO but elevated LUMO energy levels. Moreover, the -OMe substitution was found to be beneficial to the thermal stability of these coumarins. Therefore, the trimethoxy-substituted objective compound can act as a high-performance deep-blue organic light-emitting diode (OLED) emitter, and OLED based on it emits deep-blue light with CIE coordinates of (0.148, 0.084), maximum luminance of 7800 cd m(-2), and maximum external quantum efficiency of 5.1%. These results not only shed light on the molecular design strategy for high-performance deep-blue OLED emitters through color-tuning, but also show the perspective of coumarin derivatives as deep-blue OLED emitters.
引用
收藏
页码:8056 / 8060
页数:5
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