Upconversion luminescence and temperature sensing characteristics of Ho3+/Yb3+ co-doped tellurite glasses


Dogan A., ERDEM M., ESMER K., Eryürek G.

JOURNAL OF NON-CRYSTALLINE SOLIDS, vol.571, 2021 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 571
  • Publication Date: 2021
  • Doi Number: 10.1016/j.jnoncrysol.2021.121055
  • Title of Journal : JOURNAL OF NON-CRYSTALLINE SOLIDS
  • Keywords: Telluride glasses, Upconversion, Optical thermometry, Color tunability, THERMOMETRY, HO3+, PHOTOLUMINESCENCE, DEPENDENCE

Abstract

The upconversion emission spectra of Yb3+/Ho3+ co-doped TeO2-ZnO-BaO glasses were studied for solid-state lighting and optical thermometry. The studied glasses were prepared using the melt quenching technique. The green and red UC emissions of Ho3+ ions are due to two-photon absorptions, which cause the various energy transfer processes. The studied glasses show tunable color properties and high-temperature sensor sensitivity. Color coordinates on the CIE chromaticity diagram of those were affected by the pump power and shifted from green to red region at higher Ho3+ concentrations. The F-5(5) level and (F-3(4), S-5(2)) levels of Ho3+ are found to be thermally coupled levels. The energy difference (Delta E) between these levels is calculated as 2463.66 cm(-1). Among the studied glasses, Yb3+(3.0 mol%)/Ho3+(0.15 mol %) co-doped TeO2-ZnO-BaO show the highest absolute sensitivity of 0.011K(-1) at 503K. In the light of conducted observations, the studied glasses are proposed as a good candidate material for lighting and optical temperature sensing.