Persistent Organic White-Emitting Afterglow from Ultralong Thermally Activated Delayed Fluorescence and Room-Temperature Phosphorescence
Persistent Organic White-Emitting Afterglow from Ultralong Thermally Activated Delayed Fluorescence and Room-Temperature Phosphorescence
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持久性有机白光 — 超长热激活延迟荧光和室温磷光发射余辉
DOI：
10.1002/adom.202101075
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发表时间：
2021-09-02
影响因子：
9
通讯作者：
Yang, Wenjun
中科院分区：
文献类型：
--
作者：
Wang, Yaguang;Sun, Qikun;Yang, Wenjun
目前的有机白色光发射是不持久的，并且由UV光激发。本文报道了第一个以2，6-二（咔唑-9-基）苯甲腈为原料合成的超长有机室温白光晶体，该晶体能发出瞬时蓝光和延迟白色光。令人印象深刻的是，这种白色余辉是不变色的，并表现出超过6%的高光致发光（PL）效率和超过900 ms的超长寿命，可以在300-520 nm的宽波长激发。单晶分析和室温及低温PL表明，这种V型双D-A分子可以采用不同的扭曲构象堆积在一起，形成两种超长室温余辉晶体，垂直构象可以大大降低最低单重态和三重态之间的能隙，延长反向系间穿越，使其能够产生持久的可见光可激发的杂化白色-发射由超长热激活延迟荧光和室温磷光组成的余辉。
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.