Intermolecular Electronic Coupling of Organic Units for Efficient Persistent Room‐Temperature Phosphorescence
Open Access
- 6 January 2016
- journal article
- zuschrift
- Published by Wiley in Angewandte Chemie
- Vol. 128 (6) , 2221-2225
Abstract
Although persistent room‐temperature phosphorescence (RTP) emission has been observed for a few pure crystalline organic molecules, there is no consistent mechanism and no universal design strategy for organic persistent RTP (pRTP) materials. A new mechanism for pRTP is presented, based on combining the advantages of different excited‐state configurations in coupled intermolecular units, which may be applicable to a wide range of organic molecules. By following this mechanism, we have developed a successful design strategy to obtain bright pRTP by utilizing a heavy halogen atom to further increase the intersystem crossing rate of the coupled units. RTP with a remarkably long lifetime of 0.28 s and a very high quantum efficiency of 5 % was thus obtained under ambient conditions. This strategy represents an important step in the understanding of organic pRTP emission.Keywords
Funding Information
- NSFC (51173210, 51473185)
- 863 Program (SS2015AA031701)
- Science and Technology Planning Project of Guangdong (2015B090913003)
- CSC
- EPSRC
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