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Energy Express

Energy Express

  • Editor: Christian Seassal
  • Vol. 22, Iss. S3 — May. 5, 2014
  • pp: A842–A856

Efficiency improvement of a vertical light-emitting diode through surface plasmon coupling and grating scattering

Chun-Han Lin, Chieh Hsieh, Charng-Gan Tu, Yang Kuo, Horng-Shyang Chen, Pei-Ying Shih, Che-Hao Liao, Yean-Woei Kiang, C. C. Yang, Chih-Han Lai, Guan-Ru He, Jui-Hung Yeh, and Ta-Cheng Hsu  »View Author Affiliations


Optics Express, Vol. 22, Issue S3, pp. A842-A856 (2014)
http://dx.doi.org/10.1364/OE.22.00A842


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Abstract

The enhancement of output intensity, the generation of polarized output, and the reduction of the efficiency droop effect in a surface plasmon (SP) coupled vertical light-emitting diode (LED) with an Ag nano-grating structure located between the p-GaN layer and the wafer bonding metal for inducing SP coupling with the InGaN/GaN quantum wells (QWs) are demonstrated. In fabricating the vertical LED, the patterned sapphire substrate is removed with a photoelectrochemical liftoff technique. Based on the reflection measurement from the metal grating structure and the numerical simulation result, it is found that the localized surface plasmon (LSP) resonance induced around the metal grating crest plays the major role in the SP-QW coupling process although a hybrid mode of LSP and surface plasmon polariton can be generated in the coupling process. By adding a surface grating structure to the SP-coupled vertical LED on the n-GaN side, the output intensity is further enhanced, the output polarization ratio is further increased, and the efficiency droop effect is further suppressed.

© 2014 Optical Society of America

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(240.6680) Optics at surfaces : Surface plasmons

ToC Category:
Light-Emitting Diodes

History
Original Manuscript: January 2, 2014
Revised Manuscript: March 6, 2014
Manuscript Accepted: March 30, 2014
Published: April 10, 2014

Citation
Chun-Han Lin, Chieh Hsieh, Charng-Gan Tu, Yang Kuo, Horng-Shyang Chen, Pei-Ying Shih, Che-Hao Liao, Yean-Woei Kiang, C. C. Yang, Chih-Han Lai, Guan-Ru He, Jui-Hung Yeh, and Ta-Cheng Hsu, "Efficiency improvement of a vertical light-emitting diode through surface plasmon coupling and grating scattering," Opt. Express 22, A842-A856 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-S3-A842


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