Luminescence properties of Dy doped lithium zinc borosilicate glasses for photonic applications.

Different concentrations of Dy ions doped lithium zinc borosilicate glasses of chemical composition (30-x) BO - 25 SiO -10 AlO -30 LiF - 5 ZnO - x DyO (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 (λ = 2, 4 and 6). The evaluated J-O parameters were used to determine the radiative parameters such as transition probabilities (A), total transition probability rate (A), radiative lifetime (τ) and branching ratios (β) for the excited F level of Dy ions. The chromaticity coordinates determined from the emission spectra were found to be located in the white light region of CIE chromaticity diagram.