Allochroic thermally activated delayed fluorescence diodes through field-induced solvatochromic effect

被引：55

作者：

Han, Chunmiao ^{[1
]}

Duan, Chunbo ^{[1
]}

Yang, Weibo ^{[1
]}

Xie, Mingchen ^{[1
]}

Xu, Hui ^{[1
]}

机构：

[1] Heilongjiang Univ, Sch Chem & Mat Sci, Minist Educ, Key Lab Funct Inorgan Mat Chem, 74 Xuefu Rd, Harbin 150080, Heilongjiang, Peoples R China

来源：

SCIENCE ADVANCES | 2017年 / 3卷 / 09期

基金：

中国国家自然科学基金;

关键词：

LIGHT-EMITTING-DIODES; COLOR-VARIABLE ELECTROLUMINESCENCE; PHOSPHINE OXIDE; EFFICIENT; HOSTS; EMISSION;

D O I：

10.1126/sciadv.1700904

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Allochroic organic light-emitting devices (AOLEDs) characterized by field-dependent emissive color variation are promising as visible signal response units for intelligent applications. Most of the AOLEDs were realized by changing their recombination zones or inter-and intramolecular energy transfer, rendering the limited repeatability, stability, and electroluminescence (EL) performance. We report a novel thermally activated delayed fluorescence (TADF) diode that featured a successive and irreversible emission color change frombluish green to deep blue during voltage increase, which uses the significant influence of host polarity on the emission color of TADF dyes, namely, solvatochromic effect. Its host 3,6-di-tert-butyl-1,8-bis(diphenylphosphoryl)-9H-carbazole (tBCzHDPO) was designed with remarkable field-dependent polarity reduction from 7.9 to 3.3 D by virtue of hydrogen bond-induced conformational isomerization. This TADF device achieves the best EL performance among AOLEDs, to date, with, for example, an external quantum efficiency beyond 15%, aswell as the unique irreversible allochroic characteristic for visible data storage and information security.

引用

页数：8

共 38 条

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