Temperature-dependent efficiency droop behaviors of GaN-based green light-emitting diodes

doi:10.1088/1674-1056/22/4/047805

Abstract The efficiency droop behaviors of GaN-based green light emitting diodes (LEDs) are studied as a function of temperature from 300 K to 480 K. The overall quantum efficiency of the green LEDs is found to degrade as temperature increases, which is mainly caused by activation of new non-radiative recombination centers within the LED active layer. Meanwhile, the external quantum efficiency of the green LEDs starts to decrease at low injection current level (<1 A/cm²) with a temperature-insensitive peak-efficiency-current. In contrast, the peak-efficiency-current of a control GaN-based blue LED shows continuous up-shift at higher temperatures. Around the onset point of efficiency droop, the electroluminescence spectra of the green LEDs also exhibit a monotonic blue-shift of peak energy and a reduction of full width at half maximum as injection current increases. Carrier delocalization is believed to play an important role in causing the efficiency droop in GaN-based green LEDs.

Keywords: GaN green light-emitting diode efficiency droop electroluminescence

Received: 10 September 2012
Revised: 28 September 2012
Accepted manuscript online:

PACS:	78.55.Cr	(III-V semiconductors)
	85.60.Jb	(Light-emitting devices)
	78.60.Fi	(Electroluminescence)

Fund: Project supported by the State Key Program for Basic Research of China (Grant Nos. 2010CB327504, 2011CB301900, and 2011CB922100), the National Natural Science Foundation of China (Grant Nos. 60825401, 60936004, and 11104130), and the Natural Science Foundation of Jiangsu Province, China (Grant Nos. BK2012110, BK2011556, and BK2011050).

Corresponding Authors: Lu Hai
E-mail: hailu@nju.edu.cn

Cite this article:

Jiang Rong (江蓉), Lu Hai (陆海), Chen Dun-Jun (陈敦军), Ren Fang-Fang (任芳芳), Yan Da-Wei (闫大为), Zhang Rong (张荣), Zheng You-Dou (郑有炓) Temperature-dependent efficiency droop behaviors of GaN-based green light-emitting diodes 2013 Chin. Phys. B 22 047805

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Temperature-dependent efficiency droop behaviors of GaN-based green light-emitting diodes

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