Laser synthesis and luminescence properties of SrAl_2O_4:Eu~(2+), Dy~(3+) phosphors

摘要

A laser melting method has been developed for the synthesis of highly luminescent, long-lasting SrAl_204:Eu~(2+), Dy~(3+) phosphors. The high temperature achieved in high-power density CO_2 laser irradiation of mixtures of SrCO_3, Al_2O_3, Eu_2O_3, and Dy_2O_3 enabled the one-step, fast synthesis of these phosphors in air at atmospheric pressure. X-ray diffraction, Raman spectroscopy, and scanning electron microscopy characterization studies reveal that the produced materials consist of monoclinic SrAl_2O_4 grains extensively surrounded by rare-earth ion-enriched grain boundaries. The photoluminescence properties of laser-produced SrAl_2O_4:Eu~(2+), Dy~(3+) materials are discussed. The results reported here suggest that this laser melting method is a promising route for the synthesis of ceramic phosphors. It is presented as an alternative to the conventional sol-gel and solid-state methods, which require the use of high-temperature furnaces, flux additives, and reducing atmospheres.