Mechanochromic Delayed Fluorescence Switching in Propeller-Shaped Carbazole-Isophthalonitrile Luminogens with Stimuli-Responsive Intramolecular Charge-Transfer Excited States

被引：77

作者：

Yang, Minlang ^{[1
,2
]}

Park, In Seob ^{[1
]}

Miyashita, Yasuhiro ^{[3
]}

Tanaka, Katsunori ^{[3
]}

Yasuda, Takuma ^{[1
,2
]}

机构：

[1] Kyushu Univ, INAMORI Frontier Res Ctr IFRC, Nishi Ku, 744 Motooka, Fukuoka 8190395, Japan

[2] Kyushu Univ, Grad Sch Engn, Dept Appl Chem, Nishi Ku, 744 Motooka, Fukuoka 8190395, Japan

[3] Nippon Soda Co Ltd, Odawara Res Ctr, 345 Takada, Odawara, Kanagawa 2500280, Japan

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2020年 / 59卷 / 33期

关键词：

charge transfer; mechanochromism; organic light-emitting diodes; solid-state luminescence; thermally activated delayed fluorescence; AGGREGATION-INDUCED EMISSION; WHITE-LIGHT EMISSION; PIEZOCHROMIC LUMINESCENCE; MOLECULAR AGGREGATION; LIQUID-CRYSTALS; HIGH-EFFICIENCY; COLOR CHANGES; PHOTOLUMINESCENT; EMITTERS; ELECTROLUMINESCENCE;

D O I：

10.1002/anie.202005584

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Herein, the universal design of high-efficiency stimuli-responsive luminous materials endowed with mechanochromic luminescence (MCL) and thermally activated delayed fluorescence (TADF) functions is reported. The origin of the unique stimuli-triggered TADF switching for a series of carbazole-isophthalonitrile-based donor-acceptor (D-A) luminogens is demonstrated based on systematic photophysical and X-ray analysis, coupled with theoretical calculations. It was revealed that a tiny alteration of the intramolecular D-A twisting in the excited-state structures governed by the solid morphologies is responsible for this dynamic TADF switching behavior. This concept is applicable to the fabrication of bicolor emissive organic light-emitting diodes using a single TADF emitter.

引用

页码：13955 / 13961

页数：7

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