利用快速电光泵浦-探针技术研究氮化镓基蓝色发光二极管的效率下降机制

IEEE Photonic Society 24th Annual Meeting Pub Date : 2011-12-22 DOI:10.1109/PHO.2011.6110747

J. Shi, Che-wei Lin, Wei Chen, M. L. Lee, J. Sheu

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摘要

采用电光泵浦探针对不同温度下的GaN蓝色led进行了研究。测量结果表明，在中等电流密度下(~200A/cm2)，压电场致载流子逸出是导致效率下降的主要原因。

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Investigation of the efficiency-droop mechanism in a GaN based blue light-emitting diodes using a very-fast electrical-optical pump-probe technique

Electrical-optical pump-probe is used to investigate GaN blue LEDs under different temperatures. Measurement result indicates that under moderate current density (~200A/cm2) piezoelectric field induced carrier-escaping cannot be neglected and is responsible for the observed efficiency-droop.

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IEEE Photonic Society 24th Annual Meeting

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