余辉
磷光
掺杂剂
荧蒽
材料科学
光化学
化学
兴奋剂
光电子学
荧光
物理
光学
天体物理学
伽马射线暴
蒽
作者
Yaxian Xu,Shou Yuan,Guangming Wang,Jiuyang Li,Xuepu Wang,Xun Li,Shuhui Ding,Xuefeng Chen,Kaka Zhang
标识
DOI:10.1002/chem.202203670
摘要
Abstract It remains challenging to fabricate highly‐efficient and long‐lived organic afterglow materials, especially in the case of red afterglow systems. Here we develop advanced charge transfer (CT) technology to boost afterglow efficiency and lifetimes in fluoranthene‐containing dopant‐matrix systems. First, organic CT molecules possess singlet‐triplet splitting energy (Δ E ST ) of around 0.5 eV, much smaller than localized excitation systems. Second, upon doping into suitable organic matrices, dipole‐dipole interactions between 1 CT states and organic matrices reduce 1 CT levels with less effect on 3 CT levels, and thus further narrow Δ E ST and enhance intersystem crossing. Third, the rigid planar structure of fluoranthene groups and the rigid microenvironment provided by organic matrices can suppress phosphorescence quenching. Forth, the multiple donor design enables spectral red‐shifts to red region and switches on TADF mechanism to improve afterglow efficiency to 13.1 % and maintain afterglow lifetime of 0.1 s. Such high‐performance afterglow materials have been rarely explored in reported studies.
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