蓝色发光材料MGa_2S_4:Ce(M=Ca,Sr)发光特性的研究

Study for Photoluminescence Characteristics of the Blue-emiting Phosphor MGa_2S_4:Ce(M=Ca, Sr)

制备了可用于蓝色TFEL的粉末发光材料MGa2S4：Ce（M=Ca，Sr）并对其晶体结构进行了X射线分析，测量并研究了其激发光谱和发射光谱，研究了Ce3+浓度的变化对CaGa2S4：Ce和SrGa2S4：Ce的激发光谱.发射光谱、色纯度及发光强度的影响，同时研究了基质组份的改变对发光特性的影响．结果表明，CaGa2S4：Ce和SrGa2S4：Ce可发射纯蓝色光，色纯度好．对CaGa2S4：Ce来说，实现其高效率的、纯蓝色发射的最佳Ce3+浓度为6mol％，而SrGa2S4：Ce的最佳Ce3+浓度为3～4mol％．

The blue-emitting phosphor MGa2S4:Ce(M=Ca, Sr) was prepared, and its crystallinity wasanalysed by X-ray diffraction. The excitation and emission spectra of MGa2S4:Ce were measuredand investigated, and the effects of the cerium concentration and the composition of host materialon the PL properties for MGa2S4:Ce powder were studied. The results of PL measurement showedthat MGa2S4:Ce phosphor achieved an even more saturated blue emission, and the optimumcerium concentration for high efficiency and more saturated blue emission was about 6mol% forMGa2S4:Ce, 3.0~4.0mol% for SrGa2S4:Ce.