White light generation in Ce3+Tb3+Sm3+ codoped oxyfluoroborate glasses

Ce3+, Tb3+and Sm3+ oxyfluoroborate glasses were prepared and characterized using absorption, photoluminescence and time decay spectral analysis respectively. The decrease of emission peak intensity and lifetime values of Ce3+ ions are observed by introducing Tb3+ and Sm3+ into glass. This is due to an efficient energy transfer from Ce3+ to Tb3+, Sm3+; Tb3+ to Sm3+ and cross-relaxation channels. Further, the important characteristic parameters of white light emitting materials viz., energy transfer efficiency, chromaticity color coordinates, correlated color temperature and color purity are evaluated.