KBaBP2O8:Tm3+: a novel blue-emitting phosphor with high color purity

A series of novel blue emitting K1 + x Ba1 - 2x Tm (x) BP2O8 (0.01 a parts per thousand currency sign x a parts per thousand currency sign 0.08) phosphors were synthesized by a solid-state reaction at a high temperature for the first time. The phase purity and photoluminescence properties were investigated by X-ray diffraction (XRD) and fluorescence spectroscopy (FS) measurements, respectively. The influence of the doping concentration of Tm3+ on its relative emission intensity was investigated, and the critical distance was calculated. The as-prepared phosphor can be effectively excited with a 356-nm light, and exhibit blue emission at 457 nm with high color purity. The above work indicates this phosphor could be a potential candidate as blue emitting phosphor for application in white light-emitting diodes.