Premium
Intermolecular Electronic Coupling of Organic Units for Efficient Persistent Room‐Temperature Phosphorescence
Author(s) -
Yang Zhiyong,
Mao Zhu,
Zhang Xuepeng,
Ou Depei,
Mu Yingxiao,
Zhang Yi,
Zhao Cunyuan,
Liu Siwei,
Chi Zhenguo,
Xu Jiarui,
Wu YuanChun,
Lu PoYen,
Lien Alan,
Bryce Martin R.
Publication year - 2016
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201509224
Subject(s) - phosphorescence , intersystem crossing , intermolecular force , excited state , photochemistry , halogen , chemical physics , atom (system on chip) , molecule , phosphorescent organic light emitting diode , chemistry , quantum efficiency , materials science , optoelectronics , atomic physics , fluorescence , organic chemistry , optics , physics , alkyl , computer science , singlet state , embedded system
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.