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Localized excitons mediate defect emission in ZnO powders

Publication ,  Journal Article
Foreman, JV; Simmons, JG; Baughman, WE; Liu, J; Everitt, HO
Published in: Journal of Applied Physics
April 7, 2013

A series of continuous-wave spectroscopic measurements elucidates the mechanism responsible for the technologically important green emission from deep-level traps in ZnO:Zn powders. Analysis of low-temperature photoluminescence (PL) and PL excitation spectra for bound excitons compared to the temperature-dependent behavior of the green emission reveals a deep correlation between green PL and specific donor-bound excitons. Direct excitation of these bound excitons produces highly efficient green emission from near-surface defects. When normalized by the measured external quantum efficiency, the integrated PL for both excitonic and green emission features grows identically with excitation intensity, confirming the strong connection between green emission and excitons. The implications of these findings are used to circumscribe operational characteristics of doped ZnO-based white light phosphors whose quantum efficiency is almost twice as large when the bound excitons are directly excited. © 2013 American Institute of Physics.

Duke Scholars

Published In

Journal of Applied Physics

DOI

ISSN

0021-8979

Publication Date

April 7, 2013

Volume

113

Issue

13

Related Subject Headings

  • Applied Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences
  • 01 Mathematical Sciences
 

Citation

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Foreman, J. V., Simmons, J. G., Baughman, W. E., Liu, J., & Everitt, H. O. (2013). Localized excitons mediate defect emission in ZnO powders. Journal of Applied Physics, 113(13). https://doi.org/10.1063/1.4798359
Foreman, J. V., J. G. Simmons, W. E. Baughman, J. Liu, and H. O. Everitt. “Localized excitons mediate defect emission in ZnO powders.” Journal of Applied Physics 113, no. 13 (April 7, 2013). https://doi.org/10.1063/1.4798359.
Foreman JV, Simmons JG, Baughman WE, Liu J, Everitt HO. Localized excitons mediate defect emission in ZnO powders. Journal of Applied Physics. 2013 Apr 7;113(13).
Foreman, J. V., et al. “Localized excitons mediate defect emission in ZnO powders.” Journal of Applied Physics, vol. 113, no. 13, Apr. 2013. Scopus, doi:10.1063/1.4798359.
Foreman JV, Simmons JG, Baughman WE, Liu J, Everitt HO. Localized excitons mediate defect emission in ZnO powders. Journal of Applied Physics. 2013 Apr 7;113(13).
Journal cover image

Published In

Journal of Applied Physics

DOI

ISSN

0021-8979

Publication Date

April 7, 2013

Volume

113

Issue

13

Related Subject Headings

  • Applied Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences
  • 01 Mathematical Sciences