InGaN蓝光LED内量子效率的评测  

Evaluation of internal quantum efficiency of blue light emitting-diodes

作　　者：汪莱[1] 邢雨辰 郝智彪[1] 罗毅[1] 孙长征[1] 韩彦军[1] 熊兵[1] 王健[1] 李洪涛[1] 

机构地区：[1]清华大学电子工程系清华信息科学与技术国家实验室(筹),北京100084

出　　处：《中国科学：物理学、力学、天文学》2015年第6期52-58,共7页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家重点基础研究发展计划(编号:2011CB301900;2012CB3155605;2013CB632804);国家自然科学基金(批准号:61176015;61210014;51002085;61321004;61307024;61176059)资助项目

摘　　要：LED的内量子效率是评价LED性能的重要指标.本文详细介绍了目前针对Ga N基LED内量子效率的多种评测方法,包括:变温光致荧光方法、变激发功率光致荧光方法、变温电致荧光方法、效率-电流曲线拟合方法,并结合对实际样品的测试结果指出了他们的适用范围和局限性.其中,变温光致荧光方法和变激发功率光致荧光方法适用于测量材料的辐射复合效率且在结果上是一致的;而变温电致荧光方法从原理上就不可靠;效率-电流曲线拟合方法原理上可靠,但是依赖对样品参数的假设,在足够了解样品的基础上可以获得比较准确的结果.The internal quantum efficiency （IQE） is one of the most important indexes to evaluate the performance of light emitting-diodes. This paper introduced several evaluation methods of IQE widely used in current research, including temperature-dependent photoluminescence （TDPL）, excitation power dependent photoluminescence （EDPL）, temperature dependent electroluminescence （TDEL）, and fitting of efficiency-current curve. In addition, the application range and limit of these methods were also discussed based on the measurement results of practical samples. TDPL and EDPL apply to measurement of radiative recombination efficiency, and their results are consistent. The principle of TDEL is not reliable. Fitting of efficiency-current curve is reliable in principle, but it depends on the assumed parameters of samples. The believable results can be obtained based on the sufficient understanding on samples.

关 键 词：内量子效率 发光二极管 氮化镓 光致荧光 电致荧光 

分 类 号：TN312.8[电子电信—物理电子学]