Novel Blue Bipolar Thermally Activated Delayed Fluorescence Material as Host Emitter for High-Efficiency Hybrid Warm-White OLEDs with Stable High Color-Rendering Index
Novel Blue Bipolar Thermally Activated Delayed Fluorescence Material as Host Emitter for High-Efficiency Hybrid Warm-White OLEDs with Stable High Color-Rendering Index
复制标题
新型蓝色双极热激活延迟荧光材料作为具有稳定高显色指数的高效混合暖白 OLED 的主体发射器
DOI：
10.1002/adfm.201707002
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发表时间：
2018-04-25
影响因子：
19
通讯作者：
Wang, Yue
中科院分区：
文献类型：
--
作者：
Liang, Jie;Li, Chenglong;Wang, Yue
本论文合成了一种新型的热激活延迟荧光（TADF）分子PHCz 2BP，并将其用于构建高性能的有机电致发光器件（OLED）。PHCz 2BP不仅是用于高效天蓝色OLED的纯发射层，具有4.0%/6.9 lm W-1的非常高峰的外部量子效率/功率效率（EQE/PE）值，而且还充当主体以敏化高亮度和高效率的绿色、橙子和红色电致磷光，具有> 20%的通用高EQE。更重要的是，实现了基于PHCz 2BP：绿色荧光粉/PHCz 2BP：红色荧光粉双层发光体系的两种混合白色OLED。据我们所知，这是第一次报道三色（蓝-绿-红）白色器件，采用TADF蓝色主体发光体和两种磷光掺杂剂，没有任何其他额外的主机。因此，这种简单的发射系统实现了迄今为止使用混合TADF/磷光体策略的WOLED的最佳电致发光性能：前视EQE为25.1/23.6%，PE为24.1/22.5 lm W-1，亮度为1000 cd m（-2），显色指数为85/87，暖白色国际照明委员会坐标为（0.41，0.46）/（0.42，0.45），表明其在未来被用作实用的人眼友好的固态照明的潜力。
A novel thermally activated delayed fluorescence (TADF) molecule, PHCz2BP, is synthesized and used to construct high performance organic light-emitting diodes (OLEDs) in this work. PHCz2BP is not only the neat emitting layer for efficient sky-blue OLED, with very high peak external quantum efficiency/power efficiency (EQE/PE) values of 4.0%/6.9 lm W-1, but also acts as a host to sensitize high-luminance and high-efficiency green, orange, and red electrophosphorescence with the universal high EQEs of >20%. More importantly, two hybrid white OLEDs based on the double-layer emitting system of PHCz2BP: green phosphor/PHCz2BP: red phosphor are achieved. To the best of the knowledge, this is the first report for three-color (blue-green-red) white devices that adopt a TADF blue host emitter and two phosphorescent dopants without any other additional host. Such simple emitting systems thus realized the best electroluminescent performance to date for the WOLEDs utilizing the hybrid TADF/phosphor strategy: forward-viewing EQEs of 25.1/23.6% and PEs of 24.1/22.5 lm W-1 at the luminance of 1000 cd m(-2) with the color rendering indexes of 85/87 and warm-white Commission Internationale de L'Eclairage coordinates of (0.41, 0.46)/(0.42, 0.45), indicating its potential to be used as practical eye-friendly solid-state lighting in future.