Efficiency droop alleviation in blue light emitting diodes using the InGaN/GaN triangular-shaped quantum well

doi:10.1088/1674-1056/21/10/108505

Abstract The InGaN/GaN blue light emitting diode (LED) is numerically investigated using a triangular-shaped quantum well model, which involves analysis on its energy band, carrier concentration, overlap of electron and hole wave functions, radiative recombination rate, and internal quantum efficiency. The simulation results reveal that the InGaN/GaN blue light emitting diode with triangular quantum wells exhibits a higher radiative recombination rate than the conventional light emitting diode with rectangular quantum wells due to the enhanced overlap of electron and hole wave functions (above 90%) under the polarization field. Consequently, the efficiency droop is only 18% in the light emitting diode with triangular-shaped quantum wells, which is three times lower than that in a conventional LED.

Keywords: efficiency droop alleviation InGaN/GaN triangular quantum well blue light emitting diode

Received: 20 February 2012
Revised: 20 April 2012
Accepted manuscript online:

PACS:	85.60.Jb	(Light-emitting devices)
	61.72.uj	(III-V and II-VI semiconductors)
	68.65.Fg	(Quantum wells)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61076013, 51102003, and 60990313), the National Basic Research Program of China (Grant No. 2012CB619304), and the Specialized Research Fund for the Doctoral Program of Higher Education, China (Grant No. 20100001120014).

Corresponding Authors: Hu Xiao-Dong
E-mail: huxd@pku.edu.cn

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Chen Zhao (陈钊), Yang Wei (杨薇), Liu Lei (刘磊), Wan Cheng-Hao (万成昊), Li Lei (李磊), He Yong-Fa (贺永发), Liu Ning-Yang (刘宁炀), Wang Lei (王磊), Li Din (李丁), Chen Wei-Hua (陈伟华), Hu Xiao-Dong (胡晓东) Efficiency droop alleviation in blue light emitting diodes using the InGaN/GaN triangular-shaped quantum well 2012 Chin. Phys. B 21 108505

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Efficiency droop alleviation in blue light emitting diodes using the InGaN/GaN triangular-shaped quantum well

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