Wu Lishuang, Yu Yaoyao, Liu Haichao, Yang Huishan, Lin Wenyan, Wu Zhijun, Yang Bing
Opt Express. 2018 Dec 24;26(26):A996-A1006. doi: 10.1364/OE.26.00A996.
We realized an efficient hybrid tandem warm white organic light-emitting device with extremely stable color purity in forward direction by employing an easy-fabrication charge generation unit (CGU) combining 1, 4, 5, 8, 9, 11-Hexaazatriphenylene-hexacarbonitrile with ultrathin bilayers of LiF and Al. The tandem white device exhibits maximum efficiencies of 37.3 cd/A, 23.3 lm/W and still remains at high efficiencies of 34.4 cd/A, 17 lm/W at the luminance of 1000 cd/m. When the operating current density increases from 5 mA/cm to 30 mA/cm, the variations in Commission Internationale de l'Eclairage (CIE) coordinates are only (0.007, 0.003). Moreover, we also studied the cause of color variation in tandem white device by performing systematic optical simulation and discovered the origin of alleviation in efficiency roll-off for tandem white device by applying triplet-polaron quenching (TPQ) model.
我们通过采用一种易于制造的电荷产生单元（CGU）实现了一种高效的混合串联暖白色有机发光器件，该电荷产生单元将1, 4, 5, 8, 9, 11 - 六氮杂三亚苯 - 六腈与LiF和Al的超薄双层相结合，在正向方向上具有极高的颜色纯度稳定性。该串联白色器件的最大效率为37.3 cd/A、23.3 lm/W，在1000 cd/m²的亮度下仍保持34.4 cd/A、17 lm/W的高效率。当工作电流密度从5 mA/cm²增加到30 mA/cm²时，国际照明委员会（CIE）坐标的变化仅为（0.007, 0.003）。此外，我们还通过进行系统的光学模拟研究了串联白色器件颜色变化的原因，并应用三线态 - 极化子猝灭（TPQ）模型发现了串联白色器件效率滚降缓解的根源。
