Optical and luminescence characteristics of Sm3+ doped B2O3-GeO2-Gd2O3 glasses
Abstract
Glasses with the composition of 30B2O3sbnd 40GeO2-(30-x)Gd2O3-xSm2O3 (x = 0.25, 0.5, 1 and 1.5 mol%) have been prepared by melt quenching technique. Their optical and luminescence properties were analyzed via absorption, photoluminescence and decay time measurements. Judd-Ofelt intensity parameters (Ωλ, λ = 2,4,6) obtained from the absorption spectrum follow the trend Ω4 > Ω2 > Ω6. Photoluminescence spectra revealed a dominant emission band at 597 nm which was attributed to 4G5/2 → 6H7/2 transition. From the emission spectra and Judd-Ofelt intensity parameters radiative properties including transition probabilities (A), radiative decay times (τR), branching ratio (βR) and stimulated emission cross-section (σpE) were calculated. The decay curves of 4G5/2 level exhibited non-exponential behavior and well fitted to Inokuti-Hirayama model for S = 6. The analyzed spectroscopic properties viz. A, βR, σpE and CIE chromaticity coordinates demonstrate the suitability of BGGS1.00 glass for visible reddish-orange laser applications among the prepared glasses.
- Publication:
-
Optical Materials
- Pub Date:
- September 2018
- DOI:
- 10.1016/j.optmat.2018.06.015
- Bibcode:
- 2018OptMa..83..233G
- Keywords:
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- Glass;
- Luminescence;
- Judd-Ofelt analysis;
- Radiative properties;
- Decay time