White emitting aluminosilicate glass phosphors derived from Dy3+, Ag+ co-exchanged LTA zeolite

Abstract

White emitting glass phosphors were derived from the Dy3+, Ag+ co-exchanged LTA zeolite by heat treatment. Attributed to the porous structure and low Si:Al ratio of LTA, an aluminosilicate glass phosphor with outstanding thermomechanical and optical properties was obtained at a relatively low melting temperature. Due to the energy transfer from the Ag+ ions to the Dy3+ ions, the emission intensity of the Dy3+, Ag+ co-doped sample (λex = 250 nm) was improved by 4 times compared with the Dy3+ singly doped sample (λex = 388 nm). And the chromaticity coordinates moved from the yellow region to the white region. All the results suggested a facile method to fabricate glass phosphors for white light source applications.