Opposite Anisotropy Effects of Singlet and Triplet Exciton Diffusion in Tetracene Crystal

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• 作者：Xiaoyu Xie and Dr. Haibo Ma
• 刊名：ChemistryOpen
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：5
• 期：3
• 页码：201-205
• 全文大小：1288K
• ISSN：2191-1363

文摘

We observe the diffusion anisotropy difference between singlet and triplet excitons in organic crystals; that is, singlet and triplet excitons may have completely different spatial direction preference for diffusion. This phenomenon can be ascribed to the distinct dependence of different excitonic couplings (Coulomb Förster vs. exchange Dexter) existing in singlet and triplet excitons on their intermolecular distance and intermolecular orientation. Such a discovery provides insights for understanding the fundamental photophysical process in a vast range of organic condensed-phase systems and optimizing the efficiency of organic optoelectronic materials.