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采用熔盐法合成了红色荧光材料BaxWO4-Sr(0.985-x)MoO4:0.01Sm3+,为用于白光发光二极管(WLEDs),考察了其的发光性能。通过X射线粉末衍射、光致发光和扫描电镜等技术对粉体进行测试,研究Ba2+与Sr2+的不同比例和不同的烧结温度对该粉体的相结构、发光性能和微观形貌的影响。结果表明,当x=0.7时,即Ba2+与Sr2+的比例为7∶2.85时,在900℃下煅烧4 h合成的荧光粉为四方纯相结构,有优良的发光性能和微观形貌。在波长404 nm的光激发下,荧光粉的发射光谱呈3峰发射,分别位于565、602和648 nm附近,适合于用作被近紫外光激发的LED的红色荧光材料。
The red fluorescent material BaxWO4-Sr (0.985-x) MoO4: 0.01Sm3 + was synthesized by molten salt method, and its luminescent properties were investigated for white light emitting diodes (WLEDs). The powders were tested by X-ray powder diffraction, photoluminescence and scanning electron microscopy. The effects of different proportions of Ba2 + and Sr2 + and sintering temperatures on the phase structure, luminescent properties and microstructure of the powders were investigated. The results show that when x = 0.7, that is, the ratio of Ba2 + to Sr2 + is 7: 2.85, the phosphor synthesized at 900 ℃ for 4 h has a tetragonal pure phase structure with excellent luminescent properties and microscopic morphology. Under the excitation of light with a wavelength of 404 nm, the emission spectrum of the phosphor is 3 peaks, which are located near 565, 602 and 648 nm, respectively, which is suitable for the red fluorescent material of LED excited by near ultraviolet light.