Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 40, Pages 17451-17455Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202007343
Keywords
halogen bonding; high efficiency; intersystem crossing; intramolecular interaction; ultralong organic phosphorescence
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Funding
- National Natural Science Foundation of China [NSFC: 51803242, 51973239, 51733010, 61605253, 21672267]
- Science and Technology Planning Project of Guangdong [2015B090913003]
- China Postdoctoral Science Foundation [2017M620395, 2019T120763]
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Ultralong organic phosphorescence (UOP) has attracted increasing attention due to its potential applications in optoelectronics, bioelectronics, and security protection. However, achieving UOP with high quantum efficiency (QE) over 20 % is still full of challenges due to intersystem crossing (ISC) and fast non-radiative transitions in organic molecules. Here, we present a novel strategy to enhance the QE of UOP materials by modulating intramolecular halogen bonding via structural isomerism. The QE ofCzS2Brreaches up to 52.10 %, which is the highest afterglow efficiency reported so far. The crucial reason for the extraordinary QE is intramolecular halogen bonding, which can not only effectively enhance ISC by promoting spin-orbit coupling, but also greatly confine motions of excited molecules to restrict non-radiative pathways. This work provides a reasonable strategy to develop highly efficient UOP materials for practical applications.
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