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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 13 — Jun. 18, 2012
  • pp: 14556–14563

Enhancement of bandgap emission of Pt-capped MgZnO films: Important role of light extraction versus exciton-plasmon coupling

W. F. Yang, Y. N. Xie, R. Y. Liao, J. Sun, Z. Y. Wu, L. M. Wong, S. J. Wang, C. F. Wang, Alex Y. S. Lee, and H. Gong  »View Author Affiliations


Optics Express, Vol. 20, Issue 13, pp. 14556-14563 (2012)
http://dx.doi.org/10.1364/OE.20.014556


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Abstract

We present on a systematic study of the contribution of surface plasmon (SP) coupling and light extraction toward emission enhancement of Platinum (Pt) nano-patterns capped MgZnO films. Time resolved Photoluminescence (PL) results indicate that the Pt coating can greatly reduces the non-radiative recombination rate by passivation of surface states, making the decay slow down. Temperature dependence of the integrated photoluminescence intensity reveals that the Pt nano-patterns can offer a large amount of light transfer and scattering, which enormously increase the light extraction efficiency up to 3.8-fold. These results indicate that the increased light extraction efficiency caused by surface modification via Pt coating rather than SP coupling plays a dominant role in increasing bandgap emission of MgZnO film.

© 2012 OSA

OCIS Codes
(230.0250) Optical devices : Optoelectronics
(240.6680) Optics at surfaces : Surface plasmons
(250.5230) Optoelectronics : Photoluminescence
(220.4241) Optical design and fabrication : Nanostructure fabrication

ToC Category:
Optoelectronics

History
Original Manuscript: March 27, 2012
Revised Manuscript: April 27, 2012
Manuscript Accepted: May 5, 2012
Published: June 14, 2012

Citation
W. F. Yang, Y. N. Xie, R. Y. Liao, J. Sun, Z. Y. Wu, L. M. Wong, S. J. Wang, C. F. Wang, Alex Y. S. Lee, and H. Gong, "Enhancement of bandgap emission of Pt-capped MgZnO films: Important role of light extraction versus exciton-plasmon coupling," Opt. Express 20, 14556-14563 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-13-14556


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