Physical, optical and luminescence properties of B2O3-SiO2-Y2O3-CaO glasses with Sm3+ions for visible laser applications
| Autor: | Jakrapong Kaewkhao, Sujita Karki, Hyunghoon Kim, Y. Ruangtaweep, C.R. Kesavulu, Natthakridta Chanthima |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Photoluminescence Absorption spectroscopy Biophysics Analytical chemistry 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Biochemistry Acceptor Fluorescence Atomic and Molecular Physics and Optics Ion Excited state 0103 physical sciences 0210 nano-technology Ground state Luminescence |
| Zdroj: | Journal of Luminescence. 197:76-82 |
| ISSN: | 0022-2313 |
| DOI: | 10.1016/j.jlumin.2018.01.015 |
| Popis: | Silicoborate glasses with composition of (BSYCaSm:(55-x)B2O3+ 10SiO2 +25Y2O3 +10CaO + xSm2O3), (where, x= 0.05, 0.10, 0.20, 0.25, 0.30, 0.40, 0.50, mol%) have been synthesized by using the well-known melt quenching technique. The present work deals with physical, optical, photoluminescence, X-ray luminescence and decay time studies of silicoborate glasses. Judd-Ofelt (JO) intensity parameters (Ω2, Ω4 and Ω6) and radiative properties for the important luminescent level of Sm3+ ions were derived by using the absorption spectrum of 0.3 mol% Sm2O3 doped glass. The luminescence spectra in the visible region was obtained due to 4G5/2 → 6HJ (5/2, 7/2, 9/2 and 11/2) transition of Sm3+ ion under 401 nm excitation. The decay profile for the 4G5/2 level of Sm3+ ions was analyzed and found that for lower concentration (≤ 0.20 mol%) it is single exponential in nature whereas for higher concentration (≥ 0.25 mol%), it turns in to non-exponential due to the transfer of energy between donor (excited state Sm3+ion) and acceptor (ground state Sm3+ ion). As the concentration of Sm3+ ions increases the decay time of 4G5/2 state decreases. The well-known Inokuti-Hirayama (IH) model was used for fitting the non-exponential decay curves where S = 6 indicates that energy transfer process is of dipole-dipole type. Hence, in the present work, intense transition of 4G5/2 → 6H7/2 (601 nm) is found to be suitable for reddish-orange laser emission. CIE chromaticity diagram has been performed for verifying the results of fluorescence in visible laser applications at 601 nm. |
| Databáze: | OpenAIRE |
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