Synthesis and Luminescence Properties of Eu3+, Bi3+-Doped BaWO4 Phosphors

BaWO4:Eu3+, Bi3+ phosphors have been prepared by the conventional high-temperature solid-state reaction and chemical precipitation. The materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and photoluminescence (PL) technologies. When the phosphors are prepared by the high-temperature solid-state reaction, Bi3+ doping into BaWO4:Eu3+ can increase the emission intensity of 613 nm. However, maximum emission at about 595 nm was observed in Eu3+, Bi3+-doped BaWO4 phosphors prepared by the chemical precipitation. The decay constants (monitored at 595 and/or 613 nm) are within 45-100 s. The color purity of the Ba0.865WO4. Eu-0.11, Bi-0.025 phosphor (prepared by chemical precipitation) was 100%. The emission mechanism of Eu3+, Bi3+ in the BaWO4 phosphors is briefly discussed. (C) 2014 The Japan Society of Applied Physics