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Boron‐Cluster‐Enhanced Ultralong Organic Phosphorescence
Author(s) -
Tu Deshuang,
Cai Suzhi,
Fernandez Charlene,
Ma Huili,
Wang Xuan,
Wang He,
Ma Chaoqun,
Yan Hong,
Lu Changsheng,
An Zhongfu
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201903920
Subject(s) - phosphorescence , phosphor , photochemistry , intersystem crossing , boron , quantum yield , cluster (spacecraft) , excited state , triplet state , quenching (fluorescence) , materials science , luminescence , singlet state , thermochromism , chemistry , fluorescence , optoelectronics , atomic physics , organic chemistry , physics , quantum mechanics , computer science , programming language
Although carborane‐based luminescent materials have been studied for years, no persistent phosphor has been reported so far. Herein, we describe boron‐cluster‐based persistent phosphors obtained by linking a σ‐aromatic carboranyl cage to the π system of a carbazolyl group. The carboranes were found to promote intersystem crossing from a singlet to a triplet state. The rigid boron cluster was able to stabilize the ultralong triplet excitons through multiple nonclassical hydrogen bonds, such as B−H⋅⋅⋅π interactions, thus leading to a long lifetime of up to 0.666 s and an absolute phosphorescence quantum yield of 7.1 %, which is outstanding for an organic phosphor without heavy atoms. These phosphors can be excited by visible light and show dynamic emission behavior, including thermochromism and mechanochromism. This study demonstrates that non‐metal/heavy‐atom boron clusters can be used to develop multifunctional high‐performance phosphors for potential applications.