InGaN蓝光LED内量子效率的评测

Abstract

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.