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Energy Express

Energy Express

  • Editor: Christian Seassal
  • Vol. 22, Iss. S2 — Mar. 10, 2014
  • pp: A320–A327

Optical properties of nanopillar AlGaN/GaN MQWs for ultraviolet light-emitting diodes

Peng Dong, Jianchang Yan, Yun Zhang, Junxi Wang, Chong Geng, Haiyang Zheng, Xuecheng Wei, Qingfeng Yan, and Jinmin Li  »View Author Affiliations


Optics Express, Vol. 22, Issue S2, pp. A320-A327 (2014)
http://dx.doi.org/10.1364/OE.22.00A320


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Abstract

Nanopillar AlGaN/GaN multiple quantum wells ultraviolet light-emitting diodes (LEDs) were fabricated by nanosphere lithography and dry-etching. The optical properties of the nanopillar LEDs were characterized by both temperature-dependent and time-resolved photoluminescence measurements. Compared to an as-grown sample, the nanopillar sample has a PL emission peak blue-shift of 7 meV, a 42% enhanced internal quantum efficiency at room temperature and a reduced radiative recombination lifetime from 870 picosecond to 621 picosecond at 7K. These results are directly from the suppressed quantum confined stark effect that is due to the strain relaxation in the nanopillar MQWs, further revealed by micro-Raman measurement. Additionally, finite-difference time domain simulation also proves better light extraction efficiency in the nanopillar LEDs.

© 2014 Optical Society of America

OCIS Codes
(160.4760) Materials : Optical properties
(230.3670) Optical devices : Light-emitting diodes
(250.5230) Optoelectronics : Photoluminescence
(220.4241) Optical design and fabrication : Nanostructure fabrication

ToC Category:
Light-Emitting Diodes

History
Original Manuscript: November 29, 2013
Revised Manuscript: January 23, 2014
Manuscript Accepted: January 25, 2014
Published: February 10, 2014

Citation
Peng Dong, Jianchang Yan, Yun Zhang, Junxi Wang, Chong Geng, Haiyang Zheng, Xuecheng Wei, Qingfeng Yan, and Jinmin Li, "Optical properties of nanopillar AlGaN/GaN MQWs for ultraviolet light-emitting diodes," Opt. Express 22, A320-A327 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-S2-A320


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