A Hot Exciton Luminogen Constructed by an o‐Carborane Scaffold

Author:

Yu Xiao1,Xu Jingkai1,Wang Mengmeng1,Miao Xiaofei2,Fan Quli2,Tu Deshuang1,Wang Zhaojin3,Duan Chunbo4,Lu Changsheng1,Xu Hui4,Yan Hong1ORCID

Affiliation:

1. State Key Laboratory of Coordination Chemistry Jiangsu Key Laboratory of Advanced Organic Materials School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 China

2. State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM) Jiangsu Key Laboratory for Biosensors Nanjing University of Posts & Telecommunications Nanjing 210023 China

3. Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of Technology Yancheng 224051 China

4. Key Laboratory of Functional Inorganic Materials Chemistry (Ministry of Education) & School of Chemistry and Materials Science Heilongjiang University Harbin 50080 China

Abstract

AbstractEmitters with the combination of an electron donor (D) and an acceptor (A) have been widely studied and usually exhibited interesting photophysical properties. Hot exciton materials involving an ordinary D‐A structure typically undergo a hybridized local charge transfer (HLCT) process. However, the hot exciton molecules containing more D/A fragments are much less explored. In this study, a new hot exciton material based on an inorganic boron cluster is designed and synthesized, which possesses a V‐type D–A–A′–D′ molecular architecture. The emitter shows an impressive photoluminescence quantum yield (PLQY) of up to 90% and demonstrates multiple emissions, excitation‐wavelength‐, solvent‐, and temperature‐dependent emissions. These characteristics are attributed to the coexistence of HLCT and the through‐space charge transfer process (TSTC) triggered by an o‐carborane scaffold in the excited state. Besides, the interchangeable HLCT/TSCT/hRISC processes are demonstrated by temperature‐dependent spectra and femtosecond time‐resolved transient absorption spectra. These findings confirm a novel hot exciton mechanism, simultaneously induced by HLCT and TSCT. This is also the first example of a carborane‐based hot exciton molecule. The current study not only reports a new molecular architecture for a hot exciton material but also gives rise to a new insight into the hot exciton mechanism.

Funder

Ministry of Science and Technology of the People's Republic of China

National Natural Science Foundation of China

Natural Science Foundation of Jiangsu Province

Publisher

Wiley

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