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Optical Materials Express

Optical Materials Express

  • Editor: David Hagan
  • Vol. 4, Iss. 5 — May. 1, 2014
  • pp: 1023–1029

Radiative efficiency of inelastic exciton-exciton scattering in ZnO nanocrystalline films

Chin-Hau Chia and Ming-Hsiu Yen  »View Author Affiliations

Optical Materials Express, Vol. 4, Issue 5, pp. 1023-1029 (2014)

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By using high-excitation photoluminescence spectroscopy, we explored the emissions due to inelastic exciton-exciton scattering in ZnO nanocrystalline films at low temperature. It was found that the threshold excitation intensity for occurrence of inelastic exciton-exciton scattering dramatically increases as the crystalline size increases. The radiative efficiency of the inelastic exciton-exciton scattering also decreases rapidly as the crystalline size increases from 120 nm to 170 nm and eventually, no emission due to inelastic exciton-exciton scattering can be detected for crystalline size of 220 nm even at low-temperature. We believe that the spatial confinement effect is the most determinative factor influencing the efficiency of inelastic exciton-exciton scattering.

© 2014 Optical Society of America

OCIS Codes
(160.6000) Materials : Semiconductor materials
(250.5230) Optoelectronics : Photoluminescence
(310.6860) Thin films : Thin films, optical properties

ToC Category:

Original Manuscript: March 7, 2014
Revised Manuscript: April 16, 2014
Manuscript Accepted: April 17, 2014
Published: April 23, 2014

Chin-Hau Chia and Ming-Hsiu Yen, "Radiative efficiency of inelastic exciton-exciton scattering in ZnO nanocrystalline films," Opt. Mater. Express 4, 1023-1029 (2014)

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