光谱学与光谱分析, 2012, 32 (12): 3329, 网络出版: 2013-01-14
LaVO4∶Dy3+纳米棒的溶剂热合成及其光学性能
Solvothermal Synthesis and Optical Properties of LiVO4∶Dy3+ Nanorod
溶剂热合成 LaVO4∶Dy3+ 纳米棒 量子效率 荧光性能 Solvothermal synthesis LaVO4∶Dy3+nanorods Quantum efficiency Fluorescence
摘要
以氧化镧、 氧化镝、 偏钒酸铵和硝酸等为原料, 采用乙醇-水混合溶剂热法并通过调节体系pH成功合成了LaVO4∶Dy3+纳米棒, 运用X射线衍射、 透射电镜、 红外光谱、 紫外-可见漫反射光谱和荧光光谱等对样品进行了表征。 结果表明, pH从2升到4, 样品由单斜晶系转化为四方锆石型结构, 并且随着pH的增大, 晶体的晶粒尺寸变小, 样品由不规则颗粒逐步向一维棒状样品转变, 其能带隙从3.68(pH 2)减小到3.43 eV(pH 10) 。 荧光结果表明, 相比不规则形貌纳米颗粒, LaVO4∶Dy3+纳米棒的最大激发峰发生一定程度的红移, 具有最强的黄光发射(4F9/2—6H13/2)和蓝光发射(4F9/2—6H15/2), 而且其黄蓝光强度比值(Y/B)达到最大值(1.039)。
Abstract
Using La2O3, Dy2O3, NH4VO3, HNO3 as materials, solvothermal synthesis method was adopted to prepare LaVO4∶Dy3+ nanorods through adjusting the pH values of ethanol-water mixing solution.The as-prepared samples were characterized by X-ray diffraction, transmission electron microscope, infrared spectrum, UV-Vis absorption spectra and fluorescence spectra. The results show that the phase transition from m- to t -LaVO4 :Dy3+ can be found when the pH value changes from 2 to 4. With the increase of the pH value of the mixing solution, the grain size of the sample becomes smaller and the shape of LaVO4∶Dy3+ crystal changes from irregular nanoparticle to one dimension nanorod. Besides, the band gap of the sample decrease from 3.68 (pH 2) to 3.43 eV(pH 10). It is found from FL that the excitation spectra of LaVO4∶Dy3+ nanorods have a little red shift in comparison with irregular nanoparticle. Furthermore, the LaVO4∶Dy3+ nanorod exhibits the strongest yellow emission (4F9/2—6H13/2)and blue emission(4F9/2—6H15/2), and it possesses the largest Y/B value (1.039).
韦庆敏, 陆建平, 刘国聪, 梁达文. LaVO4∶Dy3+纳米棒的溶剂热合成及其光学性能[J]. 光谱学与光谱分析, 2012, 32(12): 3329. WEI Qing-min, LU Jian-ping, LIU Guo-cong, LIANG Da-wen. Solvothermal Synthesis and Optical Properties of LiVO4∶Dy3+ Nanorod[J]. Spectroscopy and Spectral Analysis, 2012, 32(12): 3329.