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中文摘要：
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。
英文摘要：
A novel type of cathode material,Mg-doped Ca：Al alloy,was successfully developed for fabrication of red organic light emitting diode（ OLED） devices. The impact of the Mg-content on the performance of the red OLED devices was experimentally investigated. The preliminary results show that depending on the Mg-content,the Mg-doping significantly affects the emission characteristics of the red OLED cathode. To be specific,doped at a Mgcontent of 20%,the Mg-doped Ca：Al cathode was found to display the optimized emission property. Powered at 13 V,the newly-developed red OLED cathode has a light emission intensity of 10250 cd / m2,an emission current density of 57. 099 m A / cm2 and the highest current efficiency of 18. 8426 cd / A. The fairly high and smoothly decreasing current-efficiency may possibly originate from the fact that the relatively balanced injection of electrons and holes results in formation of more excitons.
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