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• W3118337400 startingPage "120604" @default.
• W3118337400 abstract "• Dy 3+ doped ions are used to prepare white light emitting material using borate glasses. • CaO and CaF 2 were introduced in glass as subject of interest for optical properties. • Emission shows intense yellow and blue peaks at 575 nm and 484 nm. • Radiative transition probability, branching ratios and peak band width were evaluated. • Colour co-ordinate temperature values shows 5223K and 5237K for the glasses. In this present work, Dy 3+ doped B 2 O 3 – Li 2 O – CaO – CaF 2 (BLCFDy) glasses with variable concentrations of alkaline and alkaline earth oxide elements are prepared. The X – Ray diffraction technique has been carried out to verify the non crystallinity of BLCFDy glasses. The Fourier Transform Infrared (FT-IR) study reveals that, the structural properties of glasses exhibiting stretching and vibrational groups of various borate groups. The Optical absorption spectroscopy in Ultraviolet – Visible and Near Infrared regions provides glasses have strong absorption in NIR region for excitations 6 H 15/2 → 6 F 7/2 (895nm), 6 F 9/2 (1084nm), 6 H 9/2 (1267nm) and 6 H 11/2 (1686nm) states. The Optical band gap measurements prove existence of non-bridging oxygens (NBOs), localization of charges and donor centres in prepared glass samples. Judd–Ofelt hypothesis and intensity parameters ( Ω 2 , Ω 4 and Ω 6 ) predicts higher degree of symmetry in covalency and encompassing environment of Dy 3+ ions with constituent ligand elements. The radiative properties of glass samples like radiative transition probability (A R ), branching ratios both calculated and experimental (β cal & β rad ), peak band width (∆λ p ), stimulated emission cross – section and gain band width (σ se x ∆λ p ) predicts that prepared glasses are good host of lasing materials and optical gain medium. The Photoluminescence emission spectra exhibits two principle strong emissions at 484nm (Blue), 575nm (Yellow) and observable emission at 664nm (Red) owing to de-excitation from 4 F 9/2 to respective 6 H 15/2 , 6 H 13/2 and 6 H 11/2 states. CIE - 1931 chromaticity coordinates (x, y) and CCT values are calculated from photoluminescence emission spectra were found to be within the white light region of the CIE. For the glasses BLCFDy2 and BLCFDy3 colour coordinates (x, y) are (0.34, 0.37), (0.34, 0.38) respectively. The corresponding CCT values are 5223K and 5237K. Thus, BLCFDy2 and BLCFDy3 are the potential candidates for fabrication of white light emitting diodes (W – LEDs) also as laser host materials." @default.
• W3118337400 created "2021-01-18" @default.
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• W3118337400 date "2021-02-01" @default.
• W3118337400 modified "2023-09-24" @default.
• W3118337400 title "Dy3+ doped B2O3 – Li2O – CaO – CaF2 glass for efficient white light emitting sources" @default.
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• W3118337400 doi "https://doi.org/10.1016/j.jnoncrysol.2020.120604" @default.
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