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Thermally-activated delayed fluorescence for light-emitting devices
Chemistry Letters ( IF 1.6 ) Pub Date : 2021-01-26 , DOI: 10.1246/cl.200915
Hajime Nakanotani 1, 2 , Youichi Tsuchiya 1 , Chihaya Adachi 1, 2
Affiliation  

Harvesting of excited spin-triplet states as light is essential to realize highly efficient electroluminescence (EL) in organic light-emitting devices. In recent years, thermally activated delayed fluorescence (TADF) has attracted much attention as a novel electronic transition process, since it enables harvesting electrically generated triplet energy as EL without the utilization of rare metals such as iridium and platinum. When the energy gap between the excited spin-triplet and spin-singlet states in molecules is small enough to be compared to the environmental thermal energy at room temperature, they exhibit an intense state mixing between them, resulting in highly efficient reverse intersystem crossing from the spin-triplet to the spin-singlet due to the spin allowed transition, and successive light emission as delayed fluorescence from the singlet excited-state. Using molecules exhibiting TADF, internal EL quantum efficiencies of nearly 100%, which is the theoretical limit, have been realized with sophisticated molecular design. Here, we briefly review recent developments of TADF molecules along with the current understanding of spin-flip mechanisms in purely organic molecular systems.

中文翻译:

用于发光器件的热激活延迟荧光

捕获激发的自旋三重态作为光,对于实现有机发光器件中的高效电致发光(EL)至关重要。近年来,热激活延迟荧光(TADF)作为一种新颖的电子跃迁过程备受关注,因为它无需使用铱和铂等稀有金属就可以收集电致发光的三线态能量,如EL。当分子中激发的自旋三重态和自旋单态之间的能隙小到足以与室温下的环境热能进行比较时,它们之间会表现出强烈的状态混合,从而导致高效的逆系统间交叉。由于自旋允许过渡,因此自旋三重态变为自旋单态,从单线态激发态发出的荧光是延迟的荧光。使用具有TADF的分子,通过复杂的分子设计已经实现了接近100%的内部EL量子效率,这是理论极限。在这里,我们简要回顾一下TADF分子的最新发展以及目前对纯有机分子系统中自旋翻转机制的了解。
更新日期:2021-01-26
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