Efficiency Droop Effect Mechanism in an InGaN/GaN Blue MQW LED
WANG Jia-Xing, WANG Lai**, HAO Zhi-Biao, LUO Yi
Tsinghua National Laboratory for Information Science and Technology/State Key Lab on Integrated Optoelectronics, Department of Electronic Engineering, Tsinghua University, Beijing 100084
Efficiency Droop Effect Mechanism in an InGaN/GaN Blue MQW LED
WANG Jia-Xing, WANG Lai**, HAO Zhi-Biao, LUO Yi
Tsinghua National Laboratory for Information Science and Technology/State Key Lab on Integrated Optoelectronics, Department of Electronic Engineering, Tsinghua University, Beijing 100084
摘要In order to clarify the origin of the efficiency droop effect in InGaN based blue multiple-quantum-well (MQW) light emitting diodes (LEDs), a reasonable model is set up, taking all the possible factor (carrier delocalization, carrier leakage and Auger recombination) into account. By fitting the external quantum efficiency-injection current (η–I) measurements of two LED samples, the validity of the model is demonstrated. The fit results show that the main origin of efficiency droop at a high injection current is carrier leakage. Furthermore it is also indicated that carrier delocalization plays an important role in the efficiency droop effect in those LEDs of large localization degree.
Abstract：In order to clarify the origin of the efficiency droop effect in InGaN based blue multiple-quantum-well (MQW) light emitting diodes (LEDs), a reasonable model is set up, taking all the possible factor (carrier delocalization, carrier leakage and Auger recombination) into account. By fitting the external quantum efficiency-injection current (η–I) measurements of two LED samples, the validity of the model is demonstrated. The fit results show that the main origin of efficiency droop at a high injection current is carrier leakage. Furthermore it is also indicated that carrier delocalization plays an important role in the efficiency droop effect in those LEDs of large localization degree.
WANG Jia-Xing;WANG Lai**;HAO Zhi-Biao;LUO Yi
. Efficiency Droop Effect Mechanism in an InGaN/GaN Blue MQW LED[J]. 中国物理快报, 2011, 28(11): 118105-118105.
WANG Jia-Xing, WANG Lai**, HAO Zhi-Biao, LUO Yi
. Efficiency Droop Effect Mechanism in an InGaN/GaN Blue MQW LED. Chin. Phys. Lett., 2011, 28(11): 118105-118105.
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2011, Vol. 28 
