For the first time, extremely simplified yet high-performance thermally activated delayed fluorescent (TADF) white organic light-emitting diodes (WOLEDs) have been demonstrated. Unlike previous concepts, only a single molecular emitter is required for high-quality white emissions, where an intrinsic TADF emitter is sandwiched between p-type and n-type layers, forming a doping-free p-i-n WOLED. The WOLED exhibits a color rendering index (CRI) of 91, the first WOLED that overtakes its counterparts (single-emitter white polymer/inorganic LEDs). The maximum total external quantum efficiency (28.4%) and power efficiency (68.5 lm W^–1) are comparable to those of state-of-the-art doped TADF WOLEDs and doping-free phosphorescent WOLEDs and higher than those of TADF WOLEDs with ultrahigh CRIs (≥90) and high-quality single-emitter white LEDs. Significantly, this is the first TADF WOLED possessing ultrahigh CRIs at high luminance, and 18 796 cd m^–2 is 370% higher than that of the previous best-performing one. Moreover, the proposed WOLED is the simplest TADF WOLED.

中文翻译：

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基于单个热激活延迟荧光发射器的极其简化，高性能且无掺杂的白色有机发光二极管

首次展示了极其简化但高性能的热激活延迟荧光（TADF）白色有机发光二极管（WOLED）。与先前的概念不同，高质量的白光发射只需要一个分子发射器，其中固有的TADF发射器夹在p型和n型层之间，从而形成了无掺杂的WOLED引脚。WOLED的显色指数（CRI）为91，是第一个超过其同类产品（单发射器白色聚合物/无机LED）的WOLED。最大总外部量子效率（28.4％）和功率效率（68.5 lm W ^–1））与最先进的掺杂TADF WOLED和无掺杂磷光WOLED相当，并且比具有超高CRI（≥90）和高质量单发射白光LED的TADF WOLED更高。值得注意的是，这是首款在高亮度下具有超高CRI的TADF WOLED，其18 796 cd m ^–2比以前的最佳性能高370％。此外，提出的WOLED是最简单的TADF WOLED。