期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 60, 期 4, 页码 2058-2063出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202011830
关键词
crystal engineering; intermolecular interactions; organic room-temperature phosphorescence; sp(3) methylene linkers
资金
- National Natural Science Foundation of China [51773021, U1663229, 51473140, 5181102002, 91833304, 21973043]
- Natural Science Foundation of Hunan Province [2017JJ2245, P201903]
- Talent project of Jiangsu Specially Appointed Professor
- Open Project for the National Key Laboratory of Luminescent Materials and Devices [2017-skllmd-12]
- Brand Specialty & Preponderant Discipline Construction Projects of Jiangsu Higher Education Institutions
- Natural Science Fund for Distinguished Young Scholars of Jiangsu Province [BK20180037]
Developing highly efficient organic room-temperature phosphorescence (RTP) materials with long lifetimes is challenging. By introducing a methylene linker between carbazole and halogenated phenyl ring, phosphors CzBX (X=Cl, Br) show significantly higher phosphorescence efficiency than compounds with a C-N bond linker. This research opens the door for potential applications of these materials in anti-counterfeiting or data encryption.
It is an enormous challenge to achieve highly efficient organic room-temperature phosphorescence (RTP) with a long lifetime. We demonstrate that, by bridging the carbazole and halogenated phenyl ring with a methylene linker, RTP phosphors CzBX (X=Cl, Br) present high phosphorescence efficiency (phi(Ph)). A phi(Ph) up to 38 % was obtained for CzBBr with a lifetime of 220 ms, which is much higher than that of compounds CzPX (X=Cl, Br) with a C-N bond as a linker (phi(Ph)<1 %). Single-crystal analysis and theoretical calculations revealed that, in the crystal phase, intermolecular pi-Br interactions accelerate the intersystem crossing process, while tetrahedron-like structures induced by sp(3) methylene linkers restrain the nonradiative decay channel, leading to the high phosphorescence efficiency in CzBBr. This research paves a new road toward highly efficient and long-lived RTP materials with potential applications in anti-counterfeiting or data encryption.
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