物理学报2013，Vol.62Issue(1)：460-466,7.DOI:10.7498/aps.62.017805
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
摘要
Abstract
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Key words
light emitting diode, disorder photonic crystals, light extraction efficiency, finite-difference time-domain method引用本文复制引用
陈新莲,孔凡敏,李康,高晖,岳庆炀..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[J].物理学报,2013,62(1):460-466,7.基金项目
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)和济南大学校科研基金(批准号:XKY0917)资助的课题. （批准号:2009CB930503,2009CB930501）
