Pingsheng YU^1*, Liangbi SU², and Jun XU²

¹School of Materials Engineering, Yancheng Institute of Technology, Yancheng, Jiangsu 224051, China
²Key Laboratory of Transparent and Opto-Functional Inorganic Materials, Chinese Academy of Sciences, Shanghai Institute of Ceramics, Shanghai 200050, China

(Received February 3, 2014; Revised May 1, 2014; Accepted May 20, 2014)

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 Ba_0.865WO₄: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.

Key words: BaWO₄, Eu³⁺,Bi³⁺, phosphors

^*E-mail address: yupingsheng3110@163.com