Affiliation:
1. Department of Chemistry Renmin Hospital of Wuhan University Hubei Key Laboratory on Organic and Polymeric Optoelectronic Materials Wuhan University Wuhan 430072 P. R. China
2. College of Instrument Science and Opto‐electronic Engineering Hefei University of Technology Hefei 230009 P. R. China
3. Shenzhen Key Laboratory of New Information Display and Storage Materials College of Materials Science and Engineering Shenzhen University Shenzhen 518060 P. R. China
Abstract
AbstractThe understanding of the excited state dynamics of thermally activated delayed fluorescence (TADF) materials is crucial. In this study, two donor–acceptor‐type TADF emitters with highly twisted conformation are synthesized. The emitters with subtle chemical modification of donor unit exhibit opposite aggregation luminescent behaviors: aggregation‐induced emission (AIE) and aggregation‐caused quenching (ACQ). Through the photophysical properties study, crystallographic analysis, and theory simulations, it is discovered that X‐aggregation supports AIE behavior by restricting the intramolecular motions and preserving TADF emission via an efficient reverse intersystem crossing (RISC) process, but on the other hand, H‐aggregation leads to ACQ behavior due to inhibited RISC, disabled TADF channel, and weak phosphorescence from radiative low‐lying triplet state. The findings shed light on the excited‐state dynamic behaviors of TADF emitters, which are dependent on aggregation.
Funder
National Natural Science Foundation of China
Subject
Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials
Cited by
6 articles.
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