Infrared to visible up-conversion study for erbium-doped zinc tellurite glasses

  • Jaba N
  • Kanoun A
  • Mejri H
 et al. 
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Optical absorption and photoluminescence properties of Er3+-doped
70TeO(2)-30ZnO glass are investigated. Judd-Ofelt intensity parameters
of Er3+ have been determined to calculate the radiative transition
probabilities and the radiative lifetimes of excited states. An infrared
to visible up-conversion was observed at room temperature in this
tellurite glass system using a 797 nm excitation line. A study of the
S-4(3/2)-I-4(15/2) transition (554 nm) versus power excitation provided
evidence for a two-step up-conversion process under this excitation. A
red emission (663 nm) originating from the F-4(9/2)-I-4(15/2) transition
has been observed as well. It was found that the efficiency of this
up-conversion line is enhanced considerably with the Er3+ concentration
relative to the green emission (554 nm). This behaviour has been
explained in terms of an energy transfer between excited ions. The
temperature dependence of up-conversion intensity has been also studied
in the range 40-310 K. It was found that the thermal quenching of the
green emission (S-4(3/2)-I-4(15/2)) is large enough compared with those
of the red transition (F-4(9/2)-I-4(15/2)). This thermal quenching has
been discussed using the Riseberg and Moos model of multiphonon
emission. It has been shown that the latter approach is not consistent
with existing results. A complete analysis of the temperature-dependent
up-conversion has been made using an additional decay rate which may be
attributed to a non-radiative energy transfer and/or a charge transfer
through trapping impurities. A good agreement has been achieved between
measured and computed data.

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  • N. Jaba

  • A. Kanoun

  • H. Mejri

  • A. Selmi

  • S. Alaya

  • H. Maaref

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