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Manipulating the Stacking of Triplet Chromophores in the Crystal Form for Ultralong Organic Phosphorescence
Author(s) -
Gan Nan,
Wang Xuan,
Ma Huili,
Lv Anqi,
Wang He,
Wang Qian,
Gu Mingxing,
Cai Suzhi,
Zhang Yanyun,
Fu Lishun,
Zhang Meng,
Dong Chaomin,
Yao Wei,
Shi Huifang,
An Zhongfu,
Huang Wei
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.201907572
Subject(s) - phosphorescence , chromophore , stacking , carbazole , intermolecular force , fluorescence , quantum yield , photochemistry , materials science , crystal (programming language) , crystal structure , crystallography , chemistry , molecule , physics , optics , organic chemistry , computer science , programming language
Provided here is evidence showing that the stacking between triplet chromophores plays a critical role in ultralong organic phosphorescence (UOP) generation within a crystal. By varying the structure of a functional unit, and different on‐off UOP behavior was observed for each structure. Remarkably, 24CPhCz, having the strongest intermolecular interaction between carbazole units exhibited the most impressive UOP with a long lifetime of 1.06 s and a phosphorescence quantum yield of 2.5 %. 34CPhCz showed dual‐emission UOP and thermally activated delayed fluorescence (TADF) with a moderately decreased phosphorescence lifetime of 770 ms, while 35CPhCz only displayed TADF owing to the absence of strong electronic coupling between triplet chromophores. This study provides an explanation for UOP generation in crystal and new guidelines for obtaining UOP materials.