发光学报, 2015, 36 (12): 1422, 网络出版: 2016-02-02  

钙铝镁合金阴极对WOLED器件性能的影响

Effects of Ca/Al/Mg Alloy as Cathode on The Performance of White Organic Light-emitting Devices
作者单位
陕西科技大学 电气与信息工程学院, 陕西 西安 710021
摘要
采用Ca/Al/Mg合金作为器件的阴极,基于红绿/蓝双发光层制作了6种白色磷光OLED器件,器件结构为ITO/MoO3 (30 nm)/NPB (40 nm)/mCP∶Firpic (8%,40 nm)/CBP∶R-4B (2%)∶Ir(ppy)3 (14%,5 nm)/TPBi (10 nm)/Alq3(40 nm)/Ca∶Al∶Mg (x%,100 nm) (x=0,5,10,15,20,25)。通过改变Mg的掺杂比例,研究了不同比例的Ca/Al/Mg合金阴极对器件性能的影响。结果表明:Mg质量分数为15%的Ca/Al/Mg阴极具有良好的电子注入特性,有效改善了器件的发光特性,最大发光亮度可达1 504 cd/m2,效率达到最大值14.3 cd/A,色坐标接近(0.46, 0.42)。
Abstract
Based on the red and green/blue light emitting layer, six white phosphorescent OLEDs are fabricated by using Ca/Al/Mg alloy as cathode, and the effects of different proportion of Ca/Al/Mg alloy on OLEDs are researched by changing the doping ratio of Mg. The device structures are as follows: ITO/MoO3(30 nm)/NPB(40 nm)/mCP∶Firpic(8%)(40 nm)/CBP∶R-4B(2%)∶Ir(ppy)3(14%)(5 nm)/TPBi(10 nm)/Alq3(40 nm)/Ca∶Al∶Mg(x%)(100 nm)(x=0, 5, 10, 15, 20, 25). The experiment results show that the cathode with Mg mass fraction of 15% has good electron injection characteristics which can effectively improve the light-emitting characteristics of the device. The maximum brightness is 1 504 cd/m2, the maximum current efficiency is 14.3 cd/A, and the color coordinates is close to (0.46, 0.42).

王璐薇, 张方辉. 钙铝镁合金阴极对WOLED器件性能的影响[J]. 发光学报, 2015, 36(12): 1422. WANG Lu-wei, ZHANG Fang-hui. Effects of Ca/Al/Mg Alloy as Cathode on The Performance of White Organic Light-emitting Devices[J]. Chinese Journal of Luminescence, 2015, 36(12): 1422.

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