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利用溶液中的共沉淀反应制备了CaSiO3∶(Pb,Mn)红色光致荧光粉。以Zn(NO3)2·6H2O和AlCl3·6H2O为原料,借助CO(NH2)2水解反应,用化学均相共沉淀法和热处理工艺在荧光粉表面包覆一层ZnO∶Al透明导电薄膜。对包覆前后的样品进行了X射线衍射结构分析、光致荧光分析、透射电镜形貌观察及电阻测量。结果显示:包覆后荧光粉的电导率显著提高,但光致荧光峰的位置和强度无明显变化。综合考虑包覆对荧光粉电阻率和荧光性质的影响,优化包覆条件和热处理条件为:n(Zn)/n(Ca)=10%,n(Al)/n(Zn)=5%,75℃水解1.5h;包覆后的样品在500℃热处理45min。
The CaSiO3: (Pb, Mn) red photoluminescent phosphor was prepared by coprecipitation reaction in solution. Zn (NO3) 2 · 6H2O and AlCl3 · 6H2O as raw materials, CO (NH2) 2 hydrolysis by chemical homogeneous coprecipitation and heat treatment process in the phosphor coated with a layer of ZnO: Al transparent conductive film. The samples before and after coating were analyzed by X-ray diffraction, photofluorescence analysis, TEM observation and resistance measurement. The results showed that the conductivity of the phosphor was significantly increased after coating, but the position and intensity of the photoluminescence peak did not change significantly. Considering the influence of the coating on the resistivity and fluorescence properties of the phosphor, the optimal coating conditions and heat treatment conditions are: n (Zn) / n (Ca) = 10%, n 75 ℃ hydrolysis 1.5h; coated samples at 500 ℃ heat treatment 45min.