Luminescence properties of Dy3+ doped lithium zinc borosilicate glasses for photonic applications
Abstract
Different concentrations of Dy<sup>3+</sup> ions doped lithium zinc borosilicate glasses of chemical composition (30-x) B<sub>2</sub>O<sub>3</sub> - 25 SiO<sub>2</sub> -10 Al<sub>2</sub>O<sub>3</sub> -30 LiF - 5 ZnO - x Dy<sub>2</sub>O<sub>3</sub> (x = 0, 0.1, 0.5, 1.0 and 2.0 mol%) were prepared by the melt quenching technique. The prepared glasses were investigated through X-ray diffraction, optical absorption, photoluminescence and decay measurements. Intensities of absorption bands expressed in terms of oscillator strengths (f) were used to determine the Judd-Ofelt (J-O) intensity parameters Ω<sub>λ</sub> (λ = 2, 4 and 6). The evaluated J-O parameters were used to determine the radiative parameters such as transition probabilities (A<sub>R</sub>), total transition probability rate (A<sub>T</sub>), radiative lifetime (τ<sub>R</sub>) and branching ratios (β<sub>R</sub>) for the excited <sup>4</sup>F<sub>9/2</sub> level of Dy<sup>3+</sup> ions. The chromaticity coordinates determined from the emission spectra were found to be located in the white light region of CIE chromaticity diagram.
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