Intermolecular Electronic Coupling of Organic Units for Efficient Persistent Room‐Temperature Phosphorescence |
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| Authors: | Dr. Zhiyong Yang Dr. Zhu Mao Dr. Xuepeng Zhang Dr. Depei Ou Dr. Yingxiao Mu Prof. Yi Zhang Prof. Cunyuan Zhao Prof. Siwei Liu Prof. Zhenguo Chi Prof. Jiarui Xu Dr. Yuan‐Chun Wu Dr. Po‐Yen Lu Dr. Alan Lien Prof. Martin R. Bryce |
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| Affiliation: | 1. PCFM Lab, GDHPPC Lab, Guangdong Engineering Technology Research Center for High-performance Organic and Polymer Photoelectric Functional Films, State Key Laboratory of OEMT, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou, China;2. School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou, China;3. Shenzhen China Star Optoelectronics Technology Co., Ltd, China;4. Department of Chemistry, Durham University, Durham, UK |
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| 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. |
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| Keywords: | intersystem crossing organic materials phosphorescence photochemistry spin– orbit coupling |
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