Spectroscopic Investigation of Phosphate Glasses for Resins Free W-LED Applications

We prepare glasses with a chemical composition of 10NaO 2 -10SrO 2 -10Gd 2 O 3 -69P 2 O 5 -1Dy 2 O 3 (NSrODy) and 10NaF-10SrO 2 -10GdF 3 -69P 2 O 5 -1Dy 2 O 3 (NSrFDy) melt-quenching method and study the effect of Gd 2 O 3 and GdF 3 compounds on their physical and luminescence properties. We observed higher emission spectra intensity of NSrFDy glass than that of NSrODy glass. The difference in the intensity is attributed to the difference in OH concentrations in each samples and the efficient energy transfer from Gd 3+ ions to Dy 3+ ions in the case of NSrFDy glass. We also find that the 6 H 15/2 → 6 F 11/2 + 6 H 9/2 transition has a high oscillator strength and the relation among the J-O parameters, Ω λ ( λ = 2, 4, 6), is Ω 2 > Ω 4 > Ω 6 for both glasses. The NSrFDy glass demonstrates a high value of stimulated emission cross-section and, hence, considered good for laser gain medium. We find that CIE coordinates are (0.37, 0.42) and (0.37, 0.41), while CCT values are 4378 K and 4426 K for NSrODy and NSrFDy glasses, respectively.