A methyl-shield strategy enables efficient blue thermally activated delayed fluorescence hosts for high-performance fluorescent OLEDs,Materials Horizons

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A methyl-shield strategy enables efficient blue thermally activated delayed fluorescence hosts for high-performance fluorescent OLEDs
Materials Horizons ( IF 12.2 ) Pub Date : 2021-5-6 , DOI: 10.1039/d1mh00530h
You Ran ₁ , Ge Yang , Yang Liu , Weiguo Han , Ge Gao , Rongchuan Su , Zhengyang Bin , Jingsong You

Affiliation

Here, we report a novel methyl-shield strategy to design ideal TADF hosts for the improvement of the performance of TSF-OLEDs. The methyl group on the xanthone acceptor acts like a shield to protect the luminance center from close intermolecular hydrogen bonding with adjacent molecules, thus alleviating exciton quenching, and meanwhile the small size of the methyl group almost does not disturb the π–π stacking between acceptors, thus maintaining fast electron-transport pathways. dMeACRXTO having two methyl shields is exploited as the host to achieve a record-high EQE of 32.3%, which represents the first report of an EQE above 30% in TSF-OLEDs.

中文翻译：

甲基屏蔽策略为高性能荧光 OLED 提供高效的蓝色热激活延迟荧光主体

在这里，我们报告了一种新颖的甲基屏蔽策略来设计理想的 TADF 主体，以提高 TSF-OLED 的性能。呫吨酮受体上的甲基起到屏蔽作用，保护发光中心免受与相邻分子的紧密分子间氢键的影响，从而减轻激子猝灭，同时甲基的小尺寸几乎不会干扰受体之间的 π-π 堆积，从而保持快速的电子传输途径。d MeACRXTO具有两个甲基屏蔽被用作宿主，实现了 32.3% 的创纪录的 EQE，这是 TSF-OLED 中 EQE 超过 30% 的首次报告。

更新日期：2021-05-19

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