多级结构钨酸铋微球的合成与发光性能研究

Synthesis and Photoluminescence Properties of Bi_2WO_6 Hierarchical Microspheres

以Bi(NO3)3·5H2O与Na2WO4·2H2O为原料,利用水热法合成了钨酸铋(Bi2WO6)与稀土离子Eu3+掺杂的Bi2WO6多级纳米结构材料。借助于X射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、高分辨透射电子显微镜(HRTEM)以及荧光光谱仪(PL)等对样品的结构、形貌及发光性能进行表征。结果表明,合成的具有多级结构的Bi2WO6花状微球是由二维纳米片相互交叠而成,为正交相结构;稀土离子Eu3+掺杂Bi2WO6后,其发射光谱由WO6-6的宽带发射与Eu3+的线状发射峰组成,发光中心WO6-6与Eu3+之间存在能量传递,随着Eu3+掺杂浓度的提高,位于615 nm处Eu3+离子的特征发射峰逐渐占据主导地位,同时亦可判断,Eu3+离子取代了阳离子Bi3+的位置进入基质的格位。

The bismuth tungstate（ Bi2WO6） and rare earth ions Eu3 ＋doped Bi2WO6 hierarchical materials were synthesized via hydrothermal method using Na2WO4·2H2O and Bi（ NO3）3·5H2O as raw materials. X-ray diffraction（ XRD）,scanning electron microscopy（ SEM）,transmission electron microscope（ TEM）,high-resolution transmission electron microscopy（ HRTEM） and photoluminescence（ PL） spectra were used to investigate the phase structure,morphology and luminescence properties. The results showed that the as-prepared hierarchical and flower-like Bi2WO6 microspheres with the orthorhombic structure were constructed by a large number of the two dimension nanosheets. The emission spectrum of Bi2WO6： Eu3 ＋was composed of broad band of WO6-6and emission lines of Eu3 ＋,and there existed the energy transfer between WO6-6and Eu3 ＋. With the increase of Eu3 ＋doping concentration,the characteristic emission peaks of Eu3 ＋gradually became dominant in the emission spectrum,and it could be concluded that Eu3 ＋ions occupied the position of Bi3 ＋cations simultaneously.