Investigation of luminescence properties of Dy3+ doped LiF–Na2O– K2O–B2O3 glasses for white light generation

In this work Dy2O3 doped tri-alkali oxyfluoro-borate (NKLB-Dy) glasses were prepared by melt quenching technique for white light applications. The important optical and physical properties of the studied NKLB-Dy glasses were determined. Judd-Ofelt (JO) parameters (Ωλ, λ = 2, 4, 6) were calculated for prepared glasses using the JO-theory. The radiative properties of the glasses were investigated using JO-parameter (Ωλ), refractive index (n) and emission spectra for all concentration of Dy2O3 in NKLB glasses. Moreover higher value of Ω2 and yellow to Blue (Y/B) ratio for title NKLB-Dy glasses confirm higher degree of covalency of Dy–O bonding. The CIE color coordinates for various concentrations fall in white region and CCT value for present NKLB-Dy glasses are more than warm (CCT = 4687K) The experimental lifetime decreases with increasing Dy2O3concentration. The non radiative energy transfer through resonance transfer (RET) and cross relaxation are the predominant causes of non-exponential behavior of the lifetime. The non-radiative decay rate (Wnr) has negative value for all NKLB-Dy glasses due to higher experimental lifetime than radiative lifetime. All these results suggest the potential use of studied NKLB-Dy glasses in various photonic devices application such as white light generation. •NKLB glasses were synthesized by traditional melt quenching method.•J-O (Ωλ) parameters and lasing properties were analyzed.•All samples emit white light under 575 nm excitation.•The CCT values obtained from CIE for these glass samples shows 4687 K.