Arai Hiroki, Sasabe Hisahiro, Tsuneyama Hisaki, Kumada Kengo, Kido Junji
Department of Organic Materials Science, Graduate School of Organic Materials Science, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata, 992-8510, Japan.
Research Center for Organic Electronics (ROEL), Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata, 9928510, Japan.
Chemistry. 2021 Jul 26;27(42):10869-10874. doi: 10.1002/chem.202101188. Epub 2021 May 27.
Recently, researchers have focused on thermally activated delayed fluorescence (TADF) for efficient future lighting and displays. Among TADF emitters, a combination of triazine and acridine is a promising candidate for realizing high-efficiency organic light-emitting devices (OLEDs). However, simultaneous development of perfect horizontal orientation (Θ=100 %) and an external quantum efficiency (EQE) of over 40 % is still challenging. Here, to obtain insights for further improvements of a triazine/acridine combination, various asymmetric spirobiacridine (SBA)-based TADF emitters with a unity photoluminescence quantum yield and high Θ ratio of over 80 % were developed. Furthermore, the substitution effects of the triazine acceptor unit on the photophysical properties were studied, including molecular orientations and OLED performance. The corresponding OLED exhibited sky-blue emission with a high EQE of over 30 %.
最近，研究人员将重点放在热激活延迟荧光（TADF）上，以用于未来高效的照明和显示。在TADF发光体中，三嗪和吖啶的组合是实现高效有机发光器件（OLED）的一个有前景的候选材料。然而，要同时实现完美的水平取向（Θ = 100%）和超过40%的外量子效率（EQE）仍然具有挑战性。在此，为了获得进一步改进三嗪/吖啶组合的见解，开发了各种具有统一光致发光量子产率和超过80%的高Θ比率的基于不对称螺二吖啶（SBA）的TADF发光体。此外，还研究了三嗪受体单元对光物理性质的取代效应，包括分子取向和OLED性能。相应的OLED呈现出天蓝色发射，外量子效率超过30%。
