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以稀土氧化物和硝酸铝为原料,采用溶胶-凝胶法合成了YAG:1%Ho3+,1%Yb3+纳米晶,并通过正交试验法确定其干凝胶的合成条件。采用DTA-TG、XRD及TEM对干凝胶的合成过程、纳米晶的晶相组成及形貌进行了研究,表明干凝胶经1 200℃煅烧后形成了结晶完全的YAG相,无中间相产生。吸收光谱和上转换发射光谱分析表明,Yb3+在材料的发光过程中具有传递能量的作用,Ho3+在跃迁过程中发射出中心波长为650 nm的红色上转换荧光及540 nm的绿色上转换荧光。
YAG: 1% Ho3 + and 1% Yb3 + nanocrystals were synthesized by sol-gel method using rare earth oxides and aluminum nitrate as raw materials. The synthesis conditions of xerogel were determined by orthogonal test. DTA-TG, XRD and TEM were used to study the synthesis of xerogel, the crystal phase composition and morphology of the nanocrystals. The results showed that the crystalline YAG phase was formed after calcined at 1200 ℃, produce. Absorption spectra and up-conversion emission spectra show that Yb3 + has energy transfer during the luminescence of the material. Ho3 + emits red upconversion fluorescence with a central wavelength of 650 nm and green upconversion fluorescence with a wavelength of 540 nm during the transition.