利用复合技术提高光子晶体LED发光效率的研究  

Light Extraction Enhancement of Photonic Crystal LEDs with Complex Technology

作　　者：沈晓霞[1] 董国艳[2] 任亚洲[1] 王新中[1] 周志文[1] 

机构地区：[1]深圳信息职业技术学院电子与通信学院,广东深圳518072 [2]清华大学材料学院,北京100084

出　　处：《激光与光电子学进展》2013年第10期41-48,共8页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(60907005);广东省自然科学基金(S2012010010030);深圳市科技计划(CYJ20120615101957810;JCYJ20120821162230170)

摘　　要：介绍了几种利用复合技术提高光子晶体LED出光效率的方法。利用复合技术在LED上形成光子晶体结构和微腔结构、全方位反射镜、图形化衬底、AlGaN限制层或嵌入式光子晶体层复合的结构,可以改变LED的发光光路与内部导波模式分布,有效地提高光子晶体LED的发光效率。以五种复合结构为例进行分析,通过实验制备和时域有限差分(FDTD)模拟仿真,证实了与传统LED结构相比,经过适当优化参数配置,具有复合结构的LED比只具有表面光子晶体的LED结构出光效率有显著提高。Several methods to improve the light extraction efficiency of GaN light emitting diode （LED） are introduced. These methods include fabricating a GaN LED with photonic crystal and other structures, such as microcavity, omni-directional reflector, patterned sapphire substrate, A1GaN confining layer, and embedded photonic crystals. These structures would change the optical design of LEDs and modulate the distribution of guide modes in LEDs to improve the light extraction efficiency. From experiment demonstration and theoretical analysis of five specially designed LEDs, it is found that the characteristics of LED light emission are modulated and the LED light emission intensity is enhanced considerably compared with conventional LEDs.

关 键 词：光电子学 LED 嵌入式光子晶体 全方位反射镜 微腔 图形化蓝宝石衬底 

分 类 号：O438.1[机械工程—光学工程]