journal article·2017-10-18

Efficient Semipolar (11–22) 550 nm Yellow/Green InGaN Light-Emitting Diodes on Low Defect Density (11–22) GaN/Sapphire Templates

Hongjian Li, Michel Khoury, Bastien Bonef, Abdullah I. Alhassan, Asad J. Mughal, Ezzah Azimah, Muhammad E.A. Samsudin, Philippe De Mierry, Shuji Nakamura, James S. Speck, Steven P. DenBaars

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Abstract

We demonstrate efficient semipolar (11–22) 550 nm yellow/green InGaN light-emitting diodes (LEDs) with In 0.03 Ga 0.97 N barriers on low defect density (11–22) GaN/patterned sapphire templates. The In 0.03 Ga 0.97 N barriers were clearly identified, and no InGaN clusters were observed by atom probe tomography measurements. The semipolar (11–22) 550 nm InGaN LEDs (0.1 mm 2 size) show an output power of 2.4 mW at 100 mA and a peak external quantum efficiency of 1.3% with a low efficiency drop. In addition, the LEDs exhibit a small blue-shift of only 11 nm as injection current increases from 5 to 100 mA. These results suggest the potential to produce high efficiency semipolar InGaN LEDs with long emission wavelength on large-area sapphire substrates with economical feasibility.
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Research context

OpenAlex topics: GaN-based semiconductor devices and materials · Semiconductor materials and devices · Metal and Thin Film Mechanics

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Materials Department, University of California, Santa Barbara, California 93106, United States

Institute of Nano Optoelectronics Research and Technology, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia

CNRS−CRHEA, Rue Bernard Grégory, 06560 Valbonne, France

Department of Electrical and Computer Engineering, University of California, Santa Barbara, California 93117, United States

Funding

Solid State Lighting and Energy Electronics Center, University of California Santa Barbara · University of California, Santa Barbara · Collaborative Research in Engineering, Science and Technology, Malaysia

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