无序光子晶体提高GaN基蓝光发光二极管光提取效率的研究  

Improvement of light extraction efficiency of GaN-based blue light-emitting diode by disorder photonic crystal

作　　者：陈新莲[1,2] 孔凡敏[1] 李康[1] 高晖[1] 岳庆炀[1] 

机构地区：[1]山东大学信息科学与工程学院,济南250100 [2]济南大学物理科学与技术学院,济南250022

出　　处：《物理学报》2013年第1期460-466,共7页Acta Physica Sinica

基　　金：国家重点基础研究发展计划(批准号:2009CB930503;2009CB930501);国家自然科学基金(批准号:61077043);教育部留学回国人员科研启动基金;山东省优秀中青年科学家科研奖励基金(批准号:BS2009NJ002);济南大学校科研基金(批准号:XKY0917)资助的课题~~

摘　　要：亚波长尺度光子晶体结构可有效提升发光二极管(LED)的光提取效率(LEE),然而在制造过程中会存在缺陷或无序.利用时域有限差分法对理想方形光子晶体结构进行了优化,在此基础上对三种无序光子晶体结构进行了仿真,研究了光子晶体结构参数的无序变化对GaN基蓝光LEDLEE的影响.结果表明,光子晶体空气孔位置和半径的无序变化使优化的80nm光子晶体LED的LEE下降,而可使非优化的60nm光子晶体LED的LEE增加;当光子晶体空气孔位置和半径的无序变化量从0到±20nm之间变化时,LEE最大会产生53.8%的浮动;光子晶体刻蚀深度的无序变化对LEE影响较小,一般可以忽略.研究结果为高性能蓝光光子晶体LED的设计制作提供了重要的理论参考.Sub-wavelength photonic crystal can effectively improve the light extraction efficiency （LEE） of the light emitting diode （LED）. However, it is inevitable to have defects, （namely disorder structures） during its fabrication. In this study, the LED model with ideal quadrate photonic crystal is optimized by using the finite-different time domain method. Three different LED structures with various disordered photonic crystals are further simulated. We investigate the influences of several stochastic variables （including position, radius, and depth of an air hole） of the photonic crystal on the LEE of GaN based blue LEDs. It can be found that regarding photonic crystal LED whose air hole radius is optimized to 80 nm, the stochastic variables of the position and radius will reduce its LEE. However, an opposite trend is found when this radius is replaced by 60 nm, which is not optimized. Furhermore, the LEE fluctuates inside to an extent of 53.8% as two stochastic variables （including the randomized position and the randomized radius） change from 0 nm to ±20 nm. The influence of the stochastic variables of the depth of air hole can be neglected since this variation is very small. The results in this paper have an important reference value for designing and fabricating high-performance blue light photonic crystal LED.

关 键 词：发光二极管 无序光子晶体 光提取效率 时域有限差分法 

分 类 号：TN312.8[电子电信—物理电子学]