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采用化学共沉淀法一次煅烧制备红色荧光粉Ca0.68Mg0.2SiO3∶0.12Eu3+的基质材料,借鉴表面扩散原理对红粉进行铕元素掺杂。用X射线衍射仪、荧光分光光度计和扫描电子显微镜对试样的晶体结构,发光性能及表面形貌进行了表征,进而研究了PEG的添加量对粉体形貌及发光性能的影响。结果表明:制得的基质粉末为CaSiO3,并含有少量的CaMg(SiO3)2,PEG的添加对样品结构有一定影响。与此同时可有效提高粉体的分散度和分布均匀性,改善粒子的形貌,荧光粉的发光强度随PEG的添加量增加出现了先增加后减小的趋势,这是因为PEG的量过多,影响了Eu3+及Mg2+取代Ca1、Ca2、Ca3格位,尽管晶体结构趋于完整,也不利于样品的发光。PEG的最佳添加量为样品质量的1%,此时粉体粒子直径约1.3~1.5μm,为类球状,PEG的添加大大提高了荧光粉的发光强度。
The chemical coprecipitation method was used to calcine the host material of Ca0.68Mg0.2SiO3: 0.12Eu3 +, which is a red phosphor CaO.60Mg0.2SiO3: 0.12Eu3 +. The surface diffusion theory was used to doping europium. The crystal structure, luminescent properties and surface morphology of the samples were characterized by X-ray diffractometer, fluorescence spectrophotometer and scanning electron microscopy. The effects of PEG content on the morphology and luminescent properties of the powders were also studied. The results show that the prepared matrix powder is CaSiO3 and contains a small amount of CaMg (SiO3) 2. The addition of PEG has some influence on the structure of the sample. At the same time, it can effectively improve the dispersion and distribution of the powder and improve the morphology of the particles. The luminescence intensity of the phosphor tends to increase first and then decrease with the addition of PEG, because the amount of PEG More, affecting the substitution of Eu3 + and Mg2 + Ca1, Ca2, Ca3 lattice, although the crystal structure tends to be complete, it is not conducive to the sample luminescence. The optimum addition amount of PEG is 1% of the mass of the sample. At this time, the particle size of the powder is about 1.3-1.5 μm, which is spheroidal. The addition of PEG greatly enhances the luminescence intensity of the phosphor.