Modern lighting requires high efficiency and long lifetime simultaneously. In this paper, highly efficient white organic light emitting diodes (WOLEDs) are demonstrated based on a modified hybrid tandem structure constructed with a phosphorescent yellow‐red unit using an exciplex host and a blue‐red unit based on a thermally activated delayed fluorescence (TADF) blue emitter, and the devices are properly built with internal and external light extraction structures. The resulting four‐color WOLED exhibits an external quantum efficiency and luminous efficacy of 126.2% and 150.7 Lm W⁻¹, respectively, and the color rendering index is close to 80 at a brightness of 1000 cd m⁻². This device also shows a very good color stability with increasing luminance up to 15 000 cd m⁻² and there is only a small angular color variation for viewing angles changing from 0^° to 70^°. The T₅₀ lifetime (defined as the time corresponding to 50% decrease in luminance from an initial value) of the WOLED at an initial luminance of 1000 cd m⁻² is extrapolated as 12 600 h.

中文翻译：

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基于具有稳定的磷光红光发射器的TADF蓝光发射器，使用寿命长且发光效率为150 Lm W-1的混合串联白色OLED

现代照明需要同时具有高效率和长寿命。在本文中，基于改良的混合串联结构展示了高效的白色有机发光二极管（WOLED），该结构由使用激基复合材料主体的磷光黄红色单元和基于热激活延迟荧光（TADF）的蓝红色单元构成）蓝色发射器，并且该设备正确构建了内部和外部光提取结构。所得的四色WOLED的外部量子效率和发光效率分别为126.2％和150.7 Lm W ^-1，并且在1000 cd m ^-2的亮度下显色指数接近80 。该设备还显示出非常好的色彩稳定性，亮度提高到15 000 cd m ^-2并且视角从0 ^°到70 ^°变化的角度颜色变化很小。在初始亮度为1000 cd m ^-2的情况下，将WOLED的T ₅₀寿命（定义为对应于亮度从初始值降低50％的时间）推断为12 600 h。