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Optics Express

Optics Express

  • Vol. 16, Iss. 16 — Aug. 4, 2008
  • pp: 11907–11914

Intense ultraviolet upconversion luminescence from hexagonal NaYF4:Yb3+/Tm3+ microcrystals

Guofeng Wang, Weiping Qin, Lili Wang, Guodong Wei, Peifen Zhu, and Ryongjin Kim  »View Author Affiliations

Optics Express, Vol. 16, Issue 16, pp. 11907-11914 (2008)

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Under 980 nm excitation, unusual 3P23H6(~264 nm) and 3P23F4(~309 nm) emissions from Tm3+ ions were observed in hexagonal NaYF4:Yb3+(20%)/Tm3+(1.5%) microcrystals. In comparison with the strong emissions from 1D2 and 1I6, the emissions from 1G4 and 3H4 almost vanished due to the efficient cross-relaxation of 1G4+3H43F4+1D2(Tm3+). Double logarithmic plots of the upconversion emission intensity versus the excitation power are neither straight lines nor typical saturation curves. Theoretical analysis indicated that the complicated dependent relationships were mainly caused by phonon-assisted energy transfers and nonradiative relaxation.

© 2008 Optical Society of America

OCIS Codes
(190.4180) Nonlinear optics : Multiphoton processes

ToC Category:
Nonlinear Optics

Original Manuscript: May 23, 2008
Revised Manuscript: June 30, 2008
Manuscript Accepted: July 2, 2008
Published: July 24, 2008

Guofeng Wang, Weiping Qin, Lili Wang, Guodong Wei, Peifen Zhu, and Ryongjin Kim, "Intense ultraviolet upconversion luminescence from hexagonal NaYF4:Yb3+/Tm3+ microcrystals," Opt. Express 16, 11907-11914 (2008)

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