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Proceedings Paper

Low efficiency droop of InGaN/GaN blue LEDs with super-lattice active structure
Author(s): Shih-Pang Chang; Kuok-Pan Sou; Jet-Rung Chang; Yuh-Jen Cheng; Yuh-Jing Li; Yi-Chen Chen; Hao-Chung Kuo; Ken-Yuh Hsu; Chun-Yen Chang
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Paper Abstract

We report the efficiency droop behaviors of InGaN/GaN blue LEDs with different thickness of GaN quantum barriers (QBs). The droop percentage from efficiency peak to 70 A/cm2 is only about 10% as reducing the thickness of GaN QBs from 104 Å to 33 Å. A less carrier localization has been observed from wavelength dependent time resoled photoluminescence measurement as reducing the thickness of GaN QBs. The alleviation of droop percentage may due to more uniform distribution of electron and hole carrier in the active region, which resulted from super-lattice (SL) like active structure. The crystalline quality does not become worse from the results of v-pits density even thickness of GaN QBs is as low as 33 Å. The SL like active structure could be a potential structure to alleviate the efficiency droop for the application of solid state general lighting.

Paper Details

Date Published: 6 February 2012
PDF: 6 pages
Proc. SPIE 8278, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVI, 82781A (6 February 2012); doi: 10.1117/12.908121
Show Author Affiliations
Shih-Pang Chang, National Chiao Tung Univ. (Taiwan)
Kuok-Pan Sou, National Chiao Tung Univ. (Taiwan)
Jet-Rung Chang, National Chiao Tung Univ. (Taiwan)
Yuh-Jen Cheng, National Chiao Tung Univ. (Taiwan)
Research Ctr. for Applied Sciences (Taiwan)
Yuh-Jing Li, National Chiao Tung Univ. (Taiwan)
Yi-Chen Chen, National Chiao Tung Univ. (Taiwan)
Hao-Chung Kuo, National Chiao Tung Univ. (Taiwan)
Ken-Yuh Hsu, National Chiao Tung Univ. (Taiwan)
Chun-Yen Chang, National Chiao Tung Univ. (Taiwan)


Published in SPIE Proceedings Vol. 8278:
Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVI
Klaus P. Streubel; Heonsu Jeon; Li-Wei Tu; Norbert Linder, Editor(s)

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