余辉
发光
激发态
掺杂剂
磷光
材料科学
系统间交叉
光化学
单重态
偶极子
单重态裂变
人口
原子物理学
荧光
化学
光电子学
物理
兴奋剂
光学
有机化学
人口学
天文
社会学
伽马射线暴
作者
Yuping Sun,Jiahui Liu,Jiuyang Li,Xun Li,Xuepu Wang,Guangming Wang,Kaka Zhang
标识
DOI:10.1002/adom.202101909
摘要
Abstract In organic systems, it is very challenging to simultaneously achieve long afterglow lifetimes (τ AG ) and high afterglow efficiency (Φ AG ). Here, luminescent dopants which feature a small rate of phosphorescence decay ( k P ) and modest rate of reverse intersystem crossing ( k RISC ) are designed and k nr + k q values (nonradiative decay and quenching) of triplet excited states are suppressed by all means that include increasing molecular rigidity of luminescent dopants, screening organic matrices to strongly inhibit intramolecular motions of luminescent dopants, and deuteration of the luminescent dopants. Organic matrices are selected with large dipole moments to stabilize the singlet excited states of luminescent dopants via dipole–dipole interactions, reduce singlet–triplet splitting energy, and thus enhance Φ ISC , leading to significant population of triplet excited states. Thermally activated delayed fluorescence mechanism is also used with modest k RISC to harvest triplet energies, significantly improve Φ AG to 64%, and maintain long τ AG > 1.0 s. The obtained materials display intense afterglow brightness, excellent processability, and temperature‐sensing function.
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