Development of Eu3+-doped phosphate glass for red luminescent solid-state optical devices

P. Aryal, H. J. Kim, A. Khan, S. Saha, S. J. Kang, S. Kothan, Y. Yamsuk, J. Kaewkhao

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44 Scopus citations

Abstract

Eu3+-doped lithium phosphate glasses, (63-x) P2O5–32Li2O–5Al2O3‒xEu2O3, where 0≤x≤5 mol% concentrations were prepared by conventional melt-quenching technique. The glasses were characterized through various physical and optical properties at room and low temperatures (10K). The radiative transition probability, stimulated emission cross-section, branching ratio and radiative lifetime of the glasses were evaluated following the Judd-Ofelt theory. Two-fold increase in the photoluminescence (PL) intensity was observed under 394 nm excitation at 10K as compared to that measured at room temperature. The absence of 7F15D3,1 excitation transition at 10K was found due to a decrease in thermal energy of ground states. The presence of O2−−Eu3+ charge transfer excitation band (CTB, 200–275 nm) was observed. An optimum PL emission was recorded in the glass with 3 mol%, whereas the concentration quenching was noticed for the sample with 5 mol%. The results show that the Eu3+-doped lithium phosphate glasses could be potential candidates for red laser applications.

Original languageEnglish
Article number117564
JournalJournal of Luminescence
Volume227
DOIs
StatePublished - Nov 2020

Keywords

  • Judd-Ofelt theory
  • Melt-quenching technique
  • Phosphate glasses
  • Photoluminescence
  • X-ray luminescence

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