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- Title
Intermolecular Electronic Coupling of Organic Units for Efficient Persistent Room-Temperature Phosphorescence.
- Authors
Yang, Zhiyong; Mao, Zhu; Zhang, Xuepeng; Ou, Depei; Mu, Yingxiao; Zhang, Yi; Zhao, Cunyuan; Liu, Siwei; Chi, Zhenguo; Xu, Jiarui; Wu, Yuan-Chun; Lu, Po-Yen; Lien, Alan; Bryce, Martin R.
- 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.
- Subjects
INTERMOLECULAR interactions; SPIN-orbit interactions; PHOSPHORESCENCE; COUPLING reactions (Chemistry); EXCITED state chemistry; PHOTOCHEMISTRY
- Publication
Angewandte Chemie International Edition, 2016, Vol 55, Issue 6, p2181
- ISSN
1433-7851
- Publication type
Article
- DOI
10.1002/anie.201509224