Efficient transfer of metallophosphor excitons via confined polaritons in organic nanocrystals  

作　　者：芦文斌 陈永聪 杨旭云 敖平 Wenbin Lu;Yongcong Chen;Xuyun Yang;Ping Ao(Shanghai Center for Quantitative Life Sciences&Physics Department,Shanghai University,Shanghai 200444,China;College of Biomedical Engineering,Sichuan University,Sichuan 610064,China)

机构地区：[1]Shanghai Center for Quantitative Life Sciences&Physics Department,Shanghai University,Shanghai 200444,China [2]College of Biomedical Engineering,Sichuan University,Sichuan 610064,China

出　　处：《Chinese Physics B》2023年第10期503-508,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant No. 16Z103060007) (PA)。

摘　　要：We investigate the transfer of phosphorescent energy between co-assembled metallophosphors in crystalline nanostructures [Angew. Chem. Int. Ed. 57 7820(2018) and J. Am. Chem. Soc. 140 4269(2018)]. Neither Dexter's nor Forster's mechanism of resonance energy transfer(RET) could account fully for the observed rates, which exceed 85% with significant temperature dependence. But there exists an alternative pathway on RET mediated by intermediate states of resonantly confined exciton–polaritons. Such a mechanism was used to analyze artificial photosynthesis in organic fluorescents [Phys.Rev. Lett. 122 257402(2019)]. For metallophosphors, the confined modes act as extended states lying between the molecular S_(1) and T_(1) states, offering a bridge for the long-lived T_(1) excitons to migrate from donors to acceptors. Population dynamics with parameters taken entirely based on experiments fits the observed lifetimes of phosphorescence across a broad range of doping and temperature.

关 键 词：organic nanocrystals phosphorescent emission resonance energy transfer exciton–polariton 

分 类 号：TB383.1[一般工业技术—材料科学与工程]