Spectroscopic properties of holmium ion in PbO–B2O3–SiO2–Al2O3 glass system

• Published in: Journal of materials science. Materials in electronics Vol. 35; no. 14; p. 964
• Main Authors: Sri Pallavi, A. V., Sahaya Baskaran, G., Purnachand, N., Little Flower, G., Ravi Kumar, Valluri, Veeraiah, N.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.05.2024; Springer Nature B.V
• Subjects: Absorption spectra; Aluminum oxide; Boron oxides; Characterization and Evaluation of Materials; Chemistry and Materials Science; Electron microscopes; Holmium; Lead oxides; Luminescence; Materials Science; Molecular weight; Optical and Electronic Materials; Oscillator strengths; Photoluminescence; Physics; Refractivity; Room temperature; Silicon dioxide; Temperature
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-024-12703-4

The glasses of the composition 30PbO–60B 2 O 3 –5.5SiO 2 –(4.5 −  x ) Al 2 O 3 – x Ho 2 O 3 (with x varied from 0 and 2 mol%) were prepared. Density ( ρ ), refractive index ( n ), and average molecular weight ( M ) were calculated from experimental measurements of these glasses. The spectra of optical absorption besides the photoluminescence were recorded at room temperature in the wavelength range of 300–2200 nm and 450–2200 nm, respectively. Using the optical absorption spectra the oscillator strengths were estimated and found to be in good agreement with the theoretical values evaluated using optical absorption spectra. Glasses doped with 0.5 mol% holmium had the highest bonding parameter, while those doped with 2.0 mol% holmium had the lowest. From this observation, it was concluded that holmium ions are in a more covalent environment in H 20 glasses. The overall analysis of the luminescence spectral results indicated maximal luminescence efficiency of the glasses with 0.5 mol%.