论文部分内容阅读
采用反相微乳液法,以水/曲拉通X-100/正己醇/(环己烷+正己烷)为微乳体系,铝(Al)、钇(Y)和(Ce)的硝酸盐和氯化物作为起始反应物,氨水作为沉淀剂,成功制备了纳米球形铈掺杂钇铝石榴石(cerium doped yttrium alum inum garnet,YAG:Ce3+)荧光粉。实验表明:单相YAG可以在800℃合成,比固相反应法合成温度(1500℃)大幅度降低。用失重-差热分析仪、Fourier变换红外光谱仪、X射线衍射仪、透射电镜、荧光分光光度计等对粉体特性进行了表征。结果表明:粉体颗粒粒径约为50nm,粒度分布均匀,球形度好,分散性好,粉体的激发光谱为双峰结构,主激发波长为469nm,发射波长为532nm,适用于白光发光二极管。
The reverse microemulsion method was used to prepare the microemulsion system with water / Triton X-100 / n-hexanol / (cyclohexane + n-hexane) as the microemulsion system and the nitrates of aluminum (Al), yttrium (Y) Chloride as starting reactant and ammonia as precipitant, a cerium doped yttrium aluminum in garnet (YAG: Ce3 +) phosphor was successfully prepared. Experiments show that single phase YAG can be synthesized at 800 ℃, which is significantly lower than that of the solid phase reaction at 1500 ℃. The properties of the powders were characterized by weight loss - differential thermal analyzer, Fourier transform infrared spectroscopy, X - ray diffraction, transmission electron microscopy and fluorescence spectrophotometer. The results show that the particle size of the powder is about 50nm, the particle size distribution is uniform, the sphericity is good and the dispersivity is good. The excitation spectrum of the powder is bimodal, the main excitation wavelength is 469nm and the emission wavelength is 532nm, which is suitable for white light emitting diode .