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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 5 — Mar. 11, 2013
  • pp: 5891–5896

Luminescence enhancement of ZnO-core/a-SiNx:H-shell nanorod arrays

Rui Huang, Shuigang Xu, Yanqing Guo, Wenhao Guo, Xiang Wang, Chao Song, Jie Song, Lin Wang, Kin Ming Ho, and Ning Wang  »View Author Affiliations


Optics Express, Vol. 21, Issue 5, pp. 5891-5896 (2013)
http://dx.doi.org/10.1364/OE.21.005891


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Abstract

We report a remarkable improvement of photoluminescence from ZnO-core/a-SiNx:H-shell nanorod arrays by modulating the bandgap of a-SiNx:H shell. The a-SiNx:H shell with a large bandgap can significantly enhance UV emission by more than 8 times compared with the uncoated ZnO nanorods. Moreover, it is found that the deep-level defect emission can be almost completely suppressed for all the core–shell nanostructures, which is independent of the bandgaps of a-SiNx:H shells. Combining with the analysis of infrared absorption spectrum and luminescence characteristics of NH3-plasma treated ZnO nanorods, the improved photoluminescence is attributed to the decrease of nonradiative recombination probability and the reduction of surface band bending of ZnO cores due to the H and N passivation and the screening effect from the a-SiNx:H shells. Our findings open up new possibilities for fabricating stable and efficient UV-only emitting devices.

© 2013 OSA

OCIS Codes
(250.5230) Optoelectronics : Photoluminescence
(160.4236) Materials : Nanomaterials

ToC Category:
Materials

History
Original Manuscript: January 2, 2013
Revised Manuscript: February 11, 2013
Manuscript Accepted: February 11, 2013
Published: March 1, 2013

Citation
Rui Huang, Shuigang Xu, Yanqing Guo, Wenhao Guo, Xiang Wang, Chao Song, Jie Song, Lin Wang, Kin Ming Ho, and Ning Wang, "Luminescence enhancement of ZnO-core/a-SiNx:H-shell nanorod arrays," Opt. Express 21, 5891-5896 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-5-5891


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