水热法制备GdVO_4∶Tm蓝色纳米荧光粉体

Hydrothermal synthesis of blue luminescent nano-powders GdVO_4:Tm

采用水热法以十二烷基苯磺酸钠为活性剂合成了蓝色纳米荧光GdVO4:Tm粉体。用X射线衍射、扫描电镜、荧光光谱(PL)研究不同反应时间、反应物浓度和Tm3+掺杂量等条件下所得产物的结构和发光性能。结果说明,所得的产物为单一的四方锆型GdVO4:Tm晶体,颗粒大小约为20～50nm;GdVO4:Tm能够被200～320nm的紫外光激发,在278nm波长紫外光激发下发出波长为476nm的明亮蓝光,发光强度分别在反应物浓度为0.205mol/L时、反应时间为3d和Tm3+掺杂量为2%时最高。

GdVO4：Tm blue luminescent nano-powders were prepared via sodium dodecyl benzene sulfonate-assisted hydrothermal technique.The structure and luminescence intensity of the samples at different reaction time,concentration of reacting solution and doped amount of Tm^3＋ were characterized by X-ray powder diffraction（XRD）,scanning electron microscopy（SEM）and photoluminescence spectroscopy（PL）.The experimental results showed that GdVO4：Tm was tetragonal.The production was pure powders with a average diameter from 20 to 50nm.The reaction time,the concentration of reacting solution and doped amount of Tm^3＋ were important to the luminescence intensity of the productions.GdVO4：Tm can be excited by 200-320nm ultraviolet radiation.It emits bright blue fluorescence when excited by 278nm ultraviolet radiation.The luminescence intensity of the productions was strongest separately when the concentration of reacting solution was 0.205mol/L,the reaction time was 3d and doped amount of Tm^3＋ was 2%.