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采用高温固相法合成Ca_(0.92-x-y)Sr_xBa_yWO_4∶0.08Eu~(3+)(x=0,0.1~0.4;y=0,0.1~0.3)系列红色荧光粉。对其晶体结构、表面形貌和发光性能进行表征。结果表明:样品荧光粉为体心四方白钨矿结构;Sr~(2+)、Ba~(2+)的掺杂改变了荧光粉的形貌和尺寸;样品的激发光谱由位于350~550nm的系列激发峰构成,最强激发峰位于近紫外光区的395nm处,最强发射峰位于红光区域的617nm处,对应于Eu~(3+)的~5 D_0→~7 F_2特征跃迁;Sr~(2+)、Ba~(2+)的掺杂会改变基质的晶格参数和晶体对称性,从而提高荧光粉的发射强度,Sr~(2+)、Ba~(2+)的最佳掺杂量分别为x=0.2,y=0.15。
A series of red phosphors Ca_ (0.92-x-y) Sr_xBa_yWO_4: 0.08Eu ~ (3 +) (x = 0,0.1-0.4; y = 0,0.1-0.3) were synthesized by solid- Its crystal structure, surface morphology and luminescent properties were characterized. The results show that the sample phosphor is a body-centered tetragonal scheelite structure. The doping of Sr2 + and Ba2 + changes the shape and size of the phosphors. The excitation spectrum of the sample is composed of The strongest excitation peak is located at 395nm in the near UV region and the strongest emission peak is located at 617nm in the red region corresponding to the ~ 5 D 0 → 7 F 2 transition of Eu 3+. The doping of Sr2 + and Ba2 + can change the lattice parameters and crystal symmetry of the matrix, so as to improve the emission intensity of Sr2 +, Ba2 + The optimal doping amount is x = 0.2 and y = 0.15 respectively.