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/m². When the operating current density increases from 5 mA/cm² to 30 mA/cm², 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.

中文翻译：

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基于串联结构的混合型暖白色有机发光器件

我们通过使用易于制造的电荷产生单元（CGU），将1，4，5，8，8，11-六氮杂三亚苯基-六甲腈与LiF和Al的超薄双层。串联式白色器件的最大效率为37.3 cd / A，23.3 lm / W，并且在1000 cd / m ²的亮度下仍保持为34.4 cd / A，17 lm / W的高效率。当工作电流密度从5 mA / cm ²增加到30 mA / cm ^2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式白色器件颜色变化的原因，并通过应用三重态-极化子猝灭（TPQ）模型发现了串联式白色器件效率下降的根源。