Theoretical and experimental analysis of the effects of the series resistance on luminous efficacy in GaN-based light emitting diodes

doi:10.1088/1674-1056/23/11/118507

Abstract In this paper, a new equivalent circuit model of GaN-based light emitting diodes (LEDs) is established. The impact of the series resistance to luminous efficacy is simulated using the MATLAB software. GaN-based LEDs with different n-contact electrode materials (LEDs with Ni/Au and LEDs with Cr/Au) are fabricated. By comparing and analyzing the results of performances, we concluded that both the series resistance and the carrier loss could affect the luminous efficacy severely. LEDs with lower series resistance have higher luminous efficacy and its efficiency droop is alleviated simultaneously. To improve luminous efficacy, the fabrication process should be optimized for lower series resistance.

Keywords: GaN-based light emitting diodes series resistance luminous efficacy

Received: 14 March 2014
Revised: 13 May 2014
Accepted manuscript online:

PACS:	85.60.Jb	(Light-emitting devices)
	73.61.Ey	(III-V semiconductors)
	78.60.Fi	(Electroluminescence)
	71.20.Mq	(Elemental semiconductors)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11204009).

Corresponding Authors: Ma Li
E-mail: mali@emails.bjut.edu.cn

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Ma Li (马莉), Shen Guang-Di (沈光地), Liu Jian-Peng (刘建朋), Gao Zhi-Yuan (高志远), Xu Chen (徐晨), Wang Xun (王勋) Theoretical and experimental analysis of the effects of the series resistance on luminous efficacy in GaN-based light emitting diodes 2014 Chin. Phys. B 23 118507

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Theoretical and experimental analysis of the effects of the series resistance on luminous efficacy in GaN-based light emitting diodes

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