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Manipulation of Molecular Aggregation States to Realize Polymorphism, AIE, MCL, and TADF in a Single Molecule
Author(s) -
Huang Bin,
Chen WenCheng,
Li Zijing,
Zhang Jinfeng,
Zhao Weijun,
Feng Yan,
Tang Ben Zhong,
Lee ChunSing
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201806800
Subject(s) - anthraquinone , photoluminescence , quantum yield , aggregation induced emission , molecule , photochemistry , luminescence , polymorphism (computer science) , fluorescence , chemistry , singlet state , phenothiazine , solid state , materials science , optoelectronics , organic chemistry , excited state , physics , medicine , biochemistry , quantum mechanics , genotype , pharmacology , gene , nuclear physics
Multifunctional emitting materials are scarce and need to be further explored. Now, a newly anthraquinone derivative, 2‐(phenothiazine‐10‐yl)‐anthraquinone (PTZ‐AQ) was designed and synthesized and found to demonstrate polymorphism, multi‐color emission, aggregation‐induced emission (AIE), mechanochromic luminescence (MCL), and thermally activated delayed fluorescence (TADF) in its different solid forms. It is shown for the first time that TADF properties of a compound can be systematically tuned via its aggregation state. The optimized PTZ‐AQ crystal shows a small singlet–triplet energy splitting of 0.01 eV and exhibits red TADF with a photoluminescence quantum yield as high as 0.848. This study shows that the unique multiple functions can be integrated into one single compound through controlling the aggregation states, which provides a new strategy for the investigation and application of multifunctional organic materials.