Spectroscopy and near infrared upconversion of Er3+-doped TZNT glasses

K. Venkata Krishnaiah, J. Marques-Hueso, K. Suresh, G. Venkataiah, B. S. Richards, C. K. Jayasankar

Research output: Contribution to journalArticle

15 Citations (Scopus)
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Abstract

In this paper we report on the near infrared (NIR) upconversion (UC) and spectroscopic properties of erbium (Er3+)-doped TeO2-ZnO-Nb2O5-TiO2 (TZNT) oxide glasses. Judd-Ofelt theory has been applied to investigate the intensity parameters (Ωλ, λ=2, 4 and 6) which are used to derive radiative properties of the fluorescent levels. The different glasses present high refractive indices, low dispersion and Abbe numbers, as determined by variable angle spectroscopic ellipsometry. Under 980 nm excitation, the NIR emission profile and full width at half maximum have been studied in a broad range of Er3+ concentrations (0.01-3.0 mol%). On the other side, NIR UC has been obtained by exciting at 1523 nm, showing an increase of the intensity with Er3+ ion density in the studied range. The decay curves of the 4I13/2 level exhibit single exponential nature for all the different concentrations. The lifetime of the 4I13/2 level has been found to decrease (3.73-1.20 ms) after an initial increase (3.65-3.73 ms) with increasing of Er3+ ion concentration. The TZNT samples show broadband UC emission at 1.0 μm, which match with the band gap of silicon. This reveals that the investigated glasses could find application in photonics, for example non-linear optics and photovoltaic's.

Original languageEnglish
Pages (from-to)270-276
Number of pages7
JournalJournal of Luminescence
Volume169
Issue numberPart A
DOIs
Publication statusPublished - Jan 2016

Keywords

  • Broad band luminescence
  • Erbium ion
  • Near infrared upconversion
  • Photovoltaics
  • Spectroscopic ellipsometry

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Chemistry(all)
  • Biochemistry
  • Biophysics

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