Physical, structural and optical properties of Sm3+ doped lithium zinc alumino borate glasses

Prabhu, Nimitha and Hegde, Vinod and Wagh, Akshatha and Sayyed, M I and Agar, O and Kamath, Sudha D (2019) Physical, structural and optical properties of Sm3+ doped lithium zinc alumino borate glasses. Journal of Non-Crystalline Solids, 515 (1). pp. 116-124. ISSN 0022-3093

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Abstract

Sm3+ doped lithium zinc alumino borate glasses with composition 15ZnF2–12Li2CO3–10BaO–8Al2O3–(55-x) B2O3–xSm2O3 where x=0.1, 0.3, 0.5, 0.7 and 1.1 mol% were prepared by conventional melt quenching technique Their optical, physical, structural, mechanical and luminescence properties are investigated. UV–Vis-NIR absorption spectra showed all possible transitions of samarium ion in this glass matrix. Band gap values for all the glass samples were above 3 eV confirming the insulating nature for the glass. Densities, assessed using the Archimedes rule, were observed to be increasing with increasing samarium concentration. Increase in molar volume with addition of samarium content indicated that the extension of glass network is on account of the increase of number of Non-Bridging Oxygens created by network modifier samarium ions. Scanning Electron Microscopy (SEM) image showed a smooth surface for the synthezied glass. X-Ray Diffraction (XRD) technique was employed to verify the amorphous nature of the glasses. A Makishima and Mackenzie theoretical model gave acceptable approximation of elasticity constants viz. Young's modulus, shear modulus, bulk modulus and Poisson's ratio. The high Vickers hardness values evaluated with mechanical loads of 50, 100, 300, 500, 1000 g force, proved the stability of the glasses. Emission spectra showed a prominent transition 4G5/2→6H7/2 at 598 nm excited with 6H5/2→4P3/2 transition at 401 nm. Luminescence quenching effect was observed beyond 0.3 mol% Sm2O3 addition. The chromaticity coordinates (x, y) clustered in the orange-red region, making these Sm3+ doped lithium zinc alumino borate glasses suitable candidate for applications in LEDs and solid-state lasers.

Item Type: Article
Uncontrolled Keywords: Samarium Photoluminescence Rare earth Vickers hardness XRD Makishima and Mackenzie
Subjects: Engineering > MIT Manipal > Physics
Depositing User: MIT Library
Date Deposited: 16 May 2019 05:26
Last Modified: 16 May 2019 05:26
URI: http://eprints.manipal.edu/id/eprint/153841

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