Highly efficient tandem full exciplex orange and warm white OLEDs based on thermally activated delayed fluorescence mechanism
Highly efficient tandem full exciplex orange and warm white OLEDs based on thermally activated delayed fluorescence mechanism
复制标题
基于热激活延迟荧光机制的高效串联全激基复合物橙色和暖白色OLED
DOI：
10.1016/j.orgel.2014.11.014
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发表时间：
2015-02-01
影响因子：
3.2
通讯作者：
Wu, Hairuo
中科院分区：
文献类型：
--
作者：
Zhao, Bo;Zhang, Tianyou;Wu, Hairuo
在这篇论文中，我们展示了以2，4，6-三(3-(1H-吡唑-1-基)苯基)-1，3，5-三嗪(3P-T2T)：碳酸铯(Cs2CO3)/Al/MoO_3(MoO_3)为电荷产生层的高效串联全激基橙色和温白有机电致发光二极管(OLED)。优化后的串联橙色OLED的最大电流效率为38.1cd/A，外量子效率为14.4%。然后，我们利用蓝色和橙色两种基色的激基复合体发射体来实现高效的白色发射。由两个单色OLED串联而成的串联WOLED的EQE最高可达9.17%。同时，在不同的电压下，光谱几乎相同，国际委员会的坐标为(0.41，0.44)，仅在6V到14V之间变化(+/-0.003，+/-0.002)。我们证明了高效串联的橙色和白色串联全激基复合体橙色和白色有机电致发光器件是由于有效的反向系统间交叉而产生的热激活延迟荧光。平衡的载流子注入和复合是白光OLED光谱稳定的主要原因。(C)2014爱思唯尔B.V.保留所有权利。
In this manuscript, we demonstrated highly efficient tandem full exciplex orange and warm white organic light emitting diodes (OLEDs) by using 2,4,6-tris(3-(1H-pyrazol-1-yl) phenyl)-1,3,5-triazine (3P-T2T):cesium carbonate (Cs2CO3)/Al/molybdenum trioxide (MoO3) as the charge generation layer. The maximum current efficiency and external quantum efficiency (EQE) of the optimized tandem orange OLEDs are 38.1 cd/A and 14.4%, respectively. We then utilized two primary colors of blue and orange exciplex emitter to achieve highly efficient white emission. The tandem WOLEDs made by stacking two single color OLEDs in series demonstrate a maximum EQE of 9.17%. Meanwhile, the spectra are almost the same under various voltages, with the Commission Internationale de I'Eclairage coordinates of (0.41, 0.44), which change only (+/- 0.003, +/- 0.002) from 6 V to 14 V. We prove that the highly efficient tandem full exciplex orange and white OLEDs are attributed to the thermally activated delayed fluorescence by efficient reverse intersystem crossing. Balanced carriers injection and recombination are responsible for the stable spectra of the white OLEDs. (C) 2014 Elsevier B.V. All rights reserved.