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采用不同比例的Ca/Mg/Al合金和纯Ca/Al合金阴极分别制备结构为ITO/Mo O_3(30nm)/NPB(40nm)/TCTA(10nm)/CBP:R-4B(30nm)/TPBI(10nm)/Alq3(30nm)/Ca:Mg(X%):Al(100nm)和ITO/Mo O3(30nm)/NPB(40nm)/TCTA(10nm)/CBP:R-4B(30nm)/TPBI(10nm)/Alq3(30nm)/Ca:Al(100nm)的红光有机电致发光二极管(OLED)器件及其对应的电子型器件,研究了阴极材料对器件的影响。结果发现,Ca/Mg/Al合金阴极可以提高阴极发射电子能力。当Mg掺杂质量比为20%时,器件具有最优性能,在电压为13 V时,发光亮度为10250 cd/m2,电流密度为57.099 m A/cm2,最大电流效率为18.8426 cd/A,效率较高且滚降比较平缓。原因为载流子注入比较平衡,形成了较多的激子。
The structures of ITO / Mo O 3 (30nm) / NPB (40nm) / TCTA (10nm) / CBP: R-4B (30nm) / TPBI were prepared by different ratios of Ca / Mg / Al alloy and pure Ca / Al alloy cathode respectively. 10 nm / Alq3 30 nm / Ca: Mg (X%): Al (100 nm) and ITO / Mo O3 (30 nm) / NPB (40 nm) / TCTA (10 nm) / CBP: 10nm) / Alq3 (30nm) / Ca: Al (100nm) OLED and its corresponding electronic device, the effect of the cathode material on the device was investigated. The results show that, Ca / Mg / Al alloy cathode can increase the cathode emission electron capacity. When the mass ratio of Mg is 20%, the device has the best performance. When the voltage is 13 V, the luminescence brightness is 10250 cd / m2, the current density is 57.099 m A / cm2, the maximum current efficiency is 18.8426 cd / A, Higher efficiency and roll-off more gentle. The reason is that carrier injection is more balanced and more excitons are formed.