Improvement of Luminescence Performance by the Addition of KF in the Eu₂O₃ Doped Li₂O-AlF₃-NaF-P₂O₅ Glass for Highly Efficient Reddish-Orange Laser Application

Abstract

One mol% of europium (Eu³⁺) with the addition of potassium fluoride in Li₂O-AlF₃-NaF-P₂O₅ glass has been prepared using a melt-quenching technique. The fluorescence properties of present glasses were studied by the physical properties, FTIR (Fourier transform infrared spectroscopy), absorption spectra, photoluminescence properties, radiative properties and photometric analysis. The physical properties were measured to know the compactness of the glasses. The structural behavior of groups PO₄ and OH of the glasses was discussed through the FTIR spectra. From the FTIR spectra, the OH group of adding KF into the glass showed a low %T intensity due to the hydroxyl group that was consumed by the fluoride content, which confirms the low phonon energy. Using absorption spectra and Judd–Ofelt’s (J–O) theory, the J–O intensity parameters (Ω₂, Ω₄, and Ω₆) and radiative emission properties of excited states of Eu³⁺ ions are calculated to confirm potential laser applications. Photoluminescence properties generated excitation, emission, and lifetime for the glasses. It is observed that the enhancement of the Eu³⁺ emission at 613 nm is because of the addition of potassium fluoride. It proved the lifetime associated with the transition from the ⁵D₀ state to be a single exponential. The CIE (Commission International de I’Eclairage) chromaticity diagram estimated the CIE color coordinates and color purity of the prepared glasses. The UV lamp under wavelength at 365 nm achieved reddish-orange emissions, which is suitable for reddish-orange laser applications.

Keywords:

• Potassium fluoride
• J–O
• luminescence
• phonon sideband
• photometric analysis

Disclosure Statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This project is funded by the National Research Council of Thailand (NRCT). Thanks are also due to Thailand Science Research and Innovation (TSRI) for supporting this research. J. Kaewkhao would like to thank the National Research Council of Thailand (NRCT) for Research Grants for Talented Mid-Career Researchers Project (Project number N41A640097). The first and second authors would like to thank The Ministry of Education Culture, Research and Technology, Indonesia for supporting this project.