White and tunable light emission of Ho3+ and Pr3+ ions co-doped phosphate glasses

Abstract

The Ho3+ and Pr3+ ions co-doped phosphate glasses were prepared by melt quenching procedure with the various composition of (70-x-y)P2O5 + 20SiO2 + 10CaO + xHo2O3 + yPr2O3 (x = 0.4, 0.6, 0.8, 1.0 mol%, y = 0.6, 0.8, 1.0 mol%). The structural investigation (based on X-ray diffraction analysis) confirmed amorphous character of these glass materials. The optical properties were studied. The glass samples have strong absorption at 360 nm, and the excitation light at 360 nm can excite Ho3+ and Pr3+ ions very well, causing them to produce synergistic luminescence. The glass sample 68.8P2O5 + 20SiO2 + 10CaO + 0.4Ho2O3 + 0.8Pr2O3 emits strong white light under 360 nm excitation. The chromaticity coordinate values are x = 0.3378, y = 0.3472 in white light region, and it has a moderate correlated color temperature (CCT) of 5277 K. Decay time data reveals that there is energy transfer from Pr3+ to Ho3+ ions. This glass will be a good material for white light and tunable light emitting.