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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Vol. 21, Iss. 4 — Apr. 1, 2004
  • pp: 744–752

Infrared-to-visible upconversion of Er3+ ions in GeO2–PbO–Nb2O5 glasses

Rolindes Balda, Angel J. Garcia-Adeva, Joaquin Fernández, and José M. Fdez-Navarro  »View Author Affiliations

JOSA B, Vol. 21, Issue 4, pp. 744-752 (2004)

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We report the infrared-to-visible upconversion luminescence of Er3+-doped lead–niobium–germanate glasses (GeO2PbONb2O5) with different Er2O3 concentrations (0.5, 1, 2, and 3 wt.%) under continuous-wave and pulsed-laser excitation in the near-infrared region inside the  4I9/2 level. Intense green emission due to the (2H11/2,4S3/2) 4I15/2 transitions was observed at room temperature together with a weak red emission corresponding to the  4F9/2 4I15/2 transition. These upconversion emissions are attributed to a two-photon process. The time evolution of the green emission from the  4S3/2 level indicates that energy-transfer upconversion and excited-state absorption are responsible for the upconversion luminescence. The increase of the weak red emission with increasing Er2O3 concentration, together with its temporal behavior under infrared excitation, suggests that for Er2O3 concentrations higher than 1 wt.%, the upconverted red emission is the result of multiphonon relaxation from the  4S3/2 level and energy-transfer processes.

© 2004 Optical Society of America

OCIS Codes
(160.2750) Materials : Glass and other amorphous materials
(160.4670) Materials : Optical materials
(160.5690) Materials : Rare-earth-doped materials
(190.7220) Nonlinear optics : Upconversion
(300.6280) Spectroscopy : Spectroscopy, fluorescence and luminescence

Rolindes Balda, Angel J. Garcia-Adeva, Joaquin Fernández, and José M. Fdez-Navarro, "Infrared-to-visible upconversion of Er3+ ions in GeO2–PbO–Nb2O5 glasses," J. Opt. Soc. Am. B 21, 744-752 (2004)

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  30. In fact, n5 (t) contains a term of the form exp [n30 γIII τ3 exp (−t/τ3)], but this gives an exponentially small contribution to the temporal behavior of n4 (t) that has been neglected. The same happens with process II analyzed below.
  31. It is possible to find analytical solutions to all orders in γ in terms of the incomplete gamma function (also for the model that will be analyzed next). However, the solutions are cumbersome and not as easy to interpret as the approximations presented here.

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