具有ODR结构的高压倒装氮化镓基发光二极管
Semiconductor Optoelectronics（2018）
Abstract
通过在传统ITO+ DBR膜系结构基础上令电极金属与DBR层形成ODR(全角反射镜)膜系结构的方法,设计并制备了具有ODR结构的高压倒装氮化镓基发光二极管,有效提高了LED芯片的光效.ODR结构由DBR(分布布拉格反射镜)层上联接芯粒的电极金属和DBR层组成,经过理论分析和计算,与传统ITO+ DBR结构器件相比,在400～550 nm波长范围、全角度入射时平均反射率Rave从86.25％提升到了96.71％.实验制备了传统ITO+DBR结构和ODR结构的3颗芯粒串联的高压倒装氮化镓基LED器件,尺寸为0.2mm×0.66 mm,ODR结构器件的有效反射结构面积增加了4.8％,饱和电流增加了12 mA,用3030支架封装后在30 mA的测试电流下,电压降低了0.163V,辐射功率提升了3.78％,在显色指数均为71时光效提升了5.42％.
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