Preparation And Characterization Of Pr³⁺ Activated Red Phosphors In Two Molybdate Systems

white light emitting diode （WLED） will become the fourth generation green lightingsource due to many advantages, such as long lifetime, energy saving andenvironmental-friendliness. The main approach to obtain WLED is phosphor-converted.However, the current red-emitting phosphor used for WLED shows a rather low efficiencyunder near-UV light excitation. To solve these problems, it is important to explore novel andsuperior red phosphor for WLED.In this paper, the Pr³⁺activated La₂Mo₂O₉red phosphor were prepared by solid statereactions. The influence of the concentration of Pr³⁺, sintering temperature and differentdoped ions on the crystal structure and luminescent properties were investigated. In addition,the Pr³⁺activated CaMoO₄red phosphor was also prepared by solid state reaction, and theinfluence of the concentration of Pr³⁺, charge compensation mechanism and different dopedions on the crystal structure and luminescent properties were investigated.The phosphor samples were characterized by X-ray diffraction （XRD）, scanning electronmicroscopy （SEM）, excitation and emission spectra. In La_2-xPrxMo₂O₉system, the XRDresults indicated that all samples were the structure of cubic phase of β-La2Mo2O9. Whenexcited by450nm light, the emission spectra of the sample showed the characterized redemission of Pr³⁺. In Ca_1-xPr_xMoO₄system, the XRD results manifested that all phosphorswere isostructural and shared a tetragonal scheelite structure of space group I41/a （88）. Thephosphors with efficient charge compensation exhibit obviously enhanced red emission ofPr³⁺.In this paper, the Pr³⁺activated red phosphors in different host matrix were prepared bysolid state reaction and different influencing factors （especially doped ions） on the crystalstructure and luminescent properties were studied, which was expected to give the valuablereference to explore novel red phosphors for WLED.