AlgAn基紫外lEdS具有高光子能量和短波长的特点,在诸多领域有着广阔应用前景.结合器件电流分布、温度控制及出光增强等多物理场因素,采用有限元方法设计了一种分布式布拉格反射与小面积金属接触复合三维电极结构的AlgAn基紫外lEdS.计算分析表明,相比于传统垂直结构器件,该器件结构具有高效的电流注入效率、良好的散热水平及较高的出光效率,有望大幅度提高紫外发光器件的光电转换效率.AlGaN-based ultraviolet light-emitting diodes(UV LEDs)enjoy enormous potential for a wide range of applications.However,the efficiency of UV LEDs remains low.In this work,a novel vertical structure with distributed bragg reflectors-pixel metal combined electrodes was designed to improve the performance of ultraviolet LEDs,by utilizing the coupling relationship of multiphysics:current distribution,temperature control,and light extraction.Numerical analysis results indicate that the current distribution,heat dissipation,and light extraction efficiency in such structures are much better than those in the traditional vertical structure UV LED devices.As a result,the output power is expected to be improved by 204%and 664%at the injection current of 20 mA and100mA,respectively.国家重点基础研究发展计划(973计划)(2012CB619301;2011CB25600); 国家高技术研究发展计划(863计划)(2014AA032608); 国家自然科学基金(U1405253;61227009;11204254;11404271
