White organic light‐emitting diodes (WOLEDs) have been regarded as the candidates for next‐generation flat‐panel displays and solid‐state lighting due to their low cost. However, it is still challenging to achieve two‐component WOLEDs with high efficiency, high color index (CRI), and long lifetime. Here, high‐performance all‐fluorescence WOLEDs based on a blue fluorescent emitter and an orange thermally activated delayed fluorescent (TADF) emitter are demonstrated. The optimized all‐fluorescence WOLED with two EMLs presents the maximum external quantum efficiency (EQE), current efficiency (CE), and power efficiency (PE) of 23.4%, 40.2 cd A−1, and 33.2 lm W−1, corresponding to a maximum CRI value of 83.1 and Commission Internationale de L'Eclairage (CIE) coordinate of (0.30, 0.31). To further improve the device stability, the all‐fluorescence WOLEDs with three EMLs and tandem structure are constructed, respectively. Under the premise of ensuring efficiency, in going from the two‐EMLs to the three‐EMLs and the tandem structure, the LT50 (time to 50% of the initial luminance) of all‐fluorescence WOLEDs increase from 601 to 714 h and 1622 h at an initial luminance of 1000 cd m−2. These strategies and results present new insight into the design of all‐fluorescence WOLEDs with high efficiency, high CRI, and extended lifetime.

中文翻译：

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具有高效率和高显色指数的稳定全荧光白色有机发光二极管

白色有机发光二极管（WOLED）由于成本低廉而被认为是下一代平板显示器和固态照明的候选者。然而，实现高效率、高显色指数 (CRI) 和长寿命的双组件 WOLED 仍然具有挑战性。在这里，展示了基于蓝色荧光发射器和橙色热激活延迟荧光（TADF）发射器的高性能全荧光 WOLED。具有两个 EML 的优化全荧光 WOLED 的最大外量子效率 (EQE)、电流效率 (CE) 和功率效率 (PE) 分别为 23.4%、40.2 cd A−1和 33.2 流明瓦−1，对应的最大 CRI 值为 83.1，国际照明委员会 (CIE) 坐标为 (0.30, 0.31)。为了进一步提高器件稳定性，分别构建了具有三个EML和串联结构的全荧光WOLED。在保证效率的前提下，从双EML到三EML以及串联结构，LT50初始亮度为 1000 cd m 时，全荧光 WOLED（达到初始亮度 50% 的时间）从 601 小时增加到 714 小时和 1622 小时−2。这些策略和结果为高效率、高 CRI 和长寿命的全荧光 WOLED 的设计提供了新的见解。