Persistent Organic White-Emitting Afterglow from Ultralong Thermally Activated Delayed Fluorescence and Room-Temperature Phosphorescence

被引：32

作者：

Wang, Yaguang ^{[1
]}

Sun, Qikun ^{[1
]}

Yue, Lingtai ^{[1
]}

Ma, Jie ^{[1
]}

Yuan, Shou ^{[1
]}

Liu, Danfeng ^{[1
]}

Zhang, Haichang ^{[1
]}

Xue, Shanfeng ^{[1
]}

Yang, Wenjun ^{[1
]}

机构：

[1] Qingdao Univ Sci & Technol, Sch Polymer Sci & Engn, Minist Educ, Key Lab Rubber Plast, 53 Zhengzhou Rd, Qingdao 266042, Peoples R China

来源：

ADVANCED OPTICAL MATERIALS | 2021年 / 9卷 / 21期

基金：

中国国家自然科学基金;

关键词：

long-lived room-temperature phosphorescence; pure organic phosphors; RTP molecules; single-molecule white light emission; synergistic effects; white afterglow; LIGHT-EMISSION; COMPOUND; BLUE; AGGREGATION; COMPONENT; COLOR; ELECTROLUMINESCENCE; ENHANCEMENT; EFFICIENCY; MECHANISM;

D O I：

10.1002/adom.202101075

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The current organic white light emission is unabiding and excited by UV light. This work presents the first ultralong organic room-temperature white-emitting crystal from 2,6-di(carbazol-9-yl)benzonitrile that emits prompt blue light and delayed white light. Impressively, this white afterglow is nondiscoloring and exhibits high photoluminescence (PL) efficiency over 6% and ultralong lifetime over 900 ms and can be excited at wide wavelengths of 300-520 nm. Single-crystal analysis and room- and low-temperature PL reveal that this V-type double D-A molecule can adopt different twisted conformations to pack together and form two kinds of ultralong room-temperature afterglow crystals, and the vertical conformation can greatly reduce the energy gap between the lowest singlet and triplet states and prolong the reverse intersystem crossing to enable persistent and visible-light excitable hybrid white-emitting afterglow consisting of ultralong thermally activated delayed fluorescence and room-temperature phosphorescence.

引用

页数：7

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