Abstract
Abstract In this paper, physical, structural and optical properties of zinc bismuth phospho tellurite glass doped with various concentration of Sm3+ ions (x = 0.01, 0.1, 0.3, 0.5 and 1 mol%) were prepared by melt quenching technique. With keen interest in luminescence properties of samarium, spectroscopic properties are investigated using optical absorption spectra, excitation spectra, emission spectra and decay profiles. Applying Judd-Ofelt theoretical approach an effort is made to understand the asymmetry of samarium in phosphate host glass matrix. Using this theory three important parameters such as Ω2, Ω4, Ω6 are determined to calculate emission properties for certain Sm3+ transitions. Luminescence parameters such as stimulated emission cross section (σp) and branching ratios (βexp) have been studied through photoluminescence spectra. The PL spectra for all glasses show four emission bands centered between 561, 601, 646 and 708 owing to the 4G5/2 → 6H5/2 (561), 6H7/2 (601), 6H9/2(646) and 6H11/2(708) transitions of Sm3+ doped PZBTS glass system. Decay time data reveals that single exponential behavior of Sm3+ ions up to 0.5mol%, while non-exponential decay profile for 1 mol% Sm3+ content. CIE1931 chromaticity diagram for the PZBTS glasses were evaluated. CCT values were obtained and shows around 2510 K–2560 K for the prepared glasses. From the results we say that these materials prove to be very good materials for reddish orange lighting applications.
Published Version
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