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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 7,
  • Issue 6,
  • pp. 524-526
  • (2009)

Multi-photon upconversion luminescence of Er3+-doped Y2O3 nanocrystals

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Abstract

Visible upconversion emission intensities are investigated in Er3+-doped Y2O3 nanocrystals. We also find that the upconversion intensity varies nonlinearly with the excitation power with a threshold of 110 mW, which indicates that the green and red emissions would be photon avalanche upconversion when the excitation power exceeds the threshold.

© 2009 Chinese Optics Letters

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