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• W2891074076 abstract "Dy3+-doped Li2O-BaO-Gd2O3-SiO2 (LBGS) glasses were prepared by traditional melt quenching techniques and characterized through absorption and emission spectra. Tauc's plot for allowed direct and indirect transition are shown studied and observed in the range of 3.5 (eV) to 2.9 (eV). The variation in the band gap with the addition of Dy2O3 is due to structural changes in the glass matrix. For 0.5 mol% of Dy3+ ions doped LBGS glasses Judd-Ofelt analysis was carried out further these parameters were used to study their radiative properties for the excited luminescent levels of Dy3+ ions. White light generation was evaluated as a function of the Dy3+ ions concentration by measuring yellow-to-blue emission intensity ratios and CIE chromaticity coordinates. The non-exponential decay were observed for glasses doped beyond 0.1 mol% and were well fitted to IH-model for S = 6 (dipole-dipole interaction). The non-exponential behavior and life time quenching have been accredited to the energy transfer through dipole-dipole interaction among the excited and unexcited Dy3+ions. Pulse X-Ray decay time has measured for 0.5 mol% of Dy3+ ions doped LBGS glass. CIE-1931 chromaticity coordinates and decay profile analysis were studied. The correlated color temperature (CCT) for LBGS-0.5Dy is found to be 3621 K at λexc = 350 nm. The quantum efficiency (η) for the title LBGS-0.5Dy glass is found to be 74%. The highest values for radiative transition probability (AR), emission cross section (σ(λP)), experimental and calculated branching ratio (βR) have been observed for 4F9/2 → 6H13/2 at 576 nm." @default.
• W2891074076 created "2018-09-27" @default.
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• W2891074076 date "2019-02-01" @default.
• W2891074076 modified "2023-10-16" @default.
• W2891074076 title "Photoluminescence and white light generation of Dy2O3 doped Li2O-BaO-Gd2O3- SiO2 for white light LED" @default.
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• W2891074076 doi "https://doi.org/10.1016/j.jallcom.2018.09.156" @default.
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