Manipulation of Molecular Aggregation States to Realize Polymorphism,AIE, MCL,and TADF in a Single Molecule |
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| Authors: | Dr Bin Huang Dr Wen‐Cheng Chen Zijing Li Dr Jinfeng Zhang Dr Weijun Zhao Dr Yan Feng Prof Ben Zhong Tang Prof Chun‐Sing Lee |
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| Institution: | 1. Center of Super-Diamond and Advanced Films (COSDAF), Department of Chemistry, City University of Hong Kong, Hong Kong SAR, China;2. Jiangsu Key Laboratory of Biofunctional Molecule, College of Life Sciences and Chemistry, Jiangsu Second Normal University, Nanjing, China;3. Department of Chemistry, The Hong Kong University of Science and Technology, Kowloon, Hong Kong, P. R. China |
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| Abstract: | 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. |
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| Keywords: | aggregation-induced emission mechanochromic luminescence multicolor emission polymorphism thermally activated delayed fluorescence |
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