Lu Guang, Tan Jing, Wang Hongxiang, Man Yi, Chen Shuo, Zhang Jing, Duan Chunbo, Han Chunmiao, Xu Hui
Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education) & School of Chemistry and Material Science, Heilongjiang University, 74 Xuefu Road, 150080, Harbin, P. R. China.
Nat Commun. 2024 May 2;15(1):3705. doi: 10.1038/s41467-024-47888-z.
Organic ultralong room-temperature phosphorescence (RTP) usually emerges instantly and immediately decays after excitation removal. Here we report a new delayed RTP that is postponed by dozens of milliseconds after excitation removal and decays in two steps including an initial increase in intensity followed by subsequent decrease in intensity. The delayed RTP is achieved through introduction of phosphines into carbazole emitters. In contrast to the rapid energy transfer from single-molecular triplet states (T) to stabilized triplet states (T*) of instant RTP systems, phosphine groups insert their intermediate states (T) between carbazole-originated T and T* of carbazole-phosphine hybrids. In addition to markedly increasing emission lifetimes by ten folds, since T → T* transition require >30 milliseconds, RTP is thereby postponed by dozens of milliseconds. The emission character of carbazole-phosphine hybrids can be used to reveal information through combining instant and delayed RTP, realizing multi-level time resolution for advanced information, biological and optoelectronic applications.
有机超长室温磷光（RTP）通常在激发去除后立即出现并迅速衰减。在此，我们报告了一种新的延迟RTP，其在激发去除后延迟数十毫秒，并分两步衰减，包括强度先增加后降低。这种延迟RTP是通过将膦引入咔唑发光体中实现的。与即时RTP系统中单分子三重态（T）到稳定三重态（T*）的快速能量转移不同，膦基团在咔唑-膦杂化物中，将其中间态（T）插入到咔唑产生的T和T之间。除了将发射寿命显著延长十倍外，由于T→T跃迁需要>30毫秒，因此RTP被推迟了数十毫秒。咔唑-膦杂化物的发射特性可通过结合即时和延迟RTP来揭示信息，为先进信息、生物和光电子应用实现多级时间分辨率。
