溶胶-凝胶法制备YAG：Ho^3＋，Yb^3＋纳米晶

Sol-Gel Synthesis of YAG:Ho^(3+),Yb^(3+) Nanocrystal

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：Ho^3＋,1%Yb^3＋nanocrystal was synthesized by a sol-gel process from the mixed solution containing aluminum nitrate and rare earth oxide. The technological conditions to synthesize its xerogel were determined by orthogonal tests. DTA-TG,XRD and TEM techniques were used to study the synthe- sis process of the xerogel and characterize the crystal structure and morphology of the prepared YAG.1 Ho3＋ , 1%Yb3＋. The results show that monophase YAG crystallite can be formed without any intermediate phase after calciningthe xerogel at 1 200℃ Absorption spectrum and upconversion emission spectrum of YAG. 1 % Ho3＋, 1% Yh3＋ nanocrystal were investigated. Yb3＋ ions have the function of transferring energy in the luminescence process. Contributed to the Ho^3＋ transition, strong red and green upconversion fluorescence can be observed centered at 650 nm and 540 nm,respectively.