余辉
材料科学
激发态
掺杂剂
磷光
发光
菁
光电子学
猝灭(荧光)
光化学
荧光
原子物理学
兴奋剂
光学
化学
物理
伽马射线暴
天文
作者
Yingtong Pan,Jiuyang Li,Xuepu Wang,Yuping Sun,Biaobing Wang,Kaka Zhang
标识
DOI:10.1002/adfm.202110207
摘要
Abstract Due to the energy gap law, the direct fabrication of efficient organic afterglow materials with long emission wavelengths at ambient conditions remains challenging. Here, luminescent dopants with moderate k RISC values of 10 0 –10 1 s −1 are designed to harvest triplet energies, simultaneously improving afterglow efficiency and maintaining emission lifetimes >0.1 s. Organic matrices with large dipole moments are selected to populate the triplet excited states of the luminescent dopants and suppress their nonradiative decay and quenching. The dopant‐matrix systems exhibit TADF‐type organic afterglow with quantum efficiency of 20% to 60% and emission wavelengths exceeding 600 nm. Because of their singlet excited state nature, the TADF‐type afterglow emitters can efficiently transfer excited energy to rhodamine B or cyanine 5.5 fluorescence dyes for the construction of red and near‐infrared afterglow materials which display promising bioimaging applications.
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