Optical spectroscopy of Dy3+ doped Lithium borate glasses for luminescence applications

Dy³⁺ ion embedded in 50Li₂O : 20CaO : (30-x)B₂O₃ : xDy₂O₃ (x = 0.00, 0.10, 0.30, 0.50, and 1.0 mol%) glass matrices are prepared and investigated their optical absorption and photoluminescence (PL) as a function of different concentrations of Dy3+ ions. Based on the Judd-Ofelt theory, three spectral intensity parameters Ωλ (λ = 2, 4, 6) are calculated from absorption spectra. The PL spectra show two intense and one weak band due to ⁴F_9/2 → ⁶H_15/2 (blue), ⁶H_13/2 (yellow) and ⁶H_11/2 (red) transitions respectively. For these transitions luminescence properties are studied. With the increase in the concentration of Dy³⁺ ions, intensity increases up to 0.5 mol% and then concentration quenching is observed.