Investigation of Eu³⁺ Doped Oxy-Fluoride Phosphate Glass for Red Laser Gain Medium Application

Abstract

The oxyfluoride phosphate glass doped with europium oxide was synthesized by melt quenching technique. The structural and spectroscopic analysis has been carried out by Raman, absorption, photoluminescence, phonon side band and lifetime analysis. The absorption spectrum revealed the characteristic transitions between the ⁷F₀ ground state and ⁷F₁ first excited state to the upper-lying electronic states. The several J-O parameters: oscillator strength, radiative transition probability, stimulated emission cross-section and branching ratio. The local structure around the Eu³⁺ ions and the phonon energy of oxyfluoride phosphate glass have been confirmed on the basis of PSB associated with the ⁷F₀→⁵D₂ transition. The highest excitation spectrum showed at 395 nm for transition ⁷F₀→⁵L₆. The emission spectrum showed two major peaks corresponding to 591 nm orang emission (⁵D₀→⁷F₁) and 613 nm red emission (⁵D₀→⁷F₂). This work confirmed that 1 mol% Eu₂O₃ doped oxyfluoride phosphate glass performs a high potential for using as efficient luminescence materials for solid-state lighting application, especially for reddish-orange light-emitting glass.

Keywords:

• Oxy-fluoride glass
• phonon side band
• photoluminescence
• Judd–Ofelt parameter
• CIE

Acknowledgments

J. Kaewkhao would like to thanks National Research Council of Thailand (NRCT) under Research Grants for Talented Mid-Career Researchers Project. Thanks are also due to Thailand Science Research and Innovation (TSRI) for partially supporting this research. We would like to thank the Direktorat Riset dan Pengabdian Masyarakat, Kementerian Riset dan Teknologi/Badan Riset dan Inovasi Nasional Republik Indonesia for the funding grand No. 190/SP2H/AMD/LT/DRPM/2020.