EuBO3的低温水热合成及光谱可调性质研究

采用低温水热法合成了稀土硼酸盐EuBO3的纯相样品.利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱仪(XPS)和荧光光谱仪(PL)对样品的结构、形貌、价态及发光性质进行了研究.结果表明,该样品属六方晶系,在不同的矿化剂和碱度下呈现不同的自组装形貌.当以NaOH或NH3.H2O为矿化剂时,该样品分别沿着(100)和(002)晶面生长.因为Eu离子以混合价态形式存在,样品表现出光谱可调性,当激发波长为270～360 nm时,样品荧光由红色转为橙色,经粉紫光变为蓝光.

Tunable Luminescence Properties of EuBO3 Synthesized by Low Temperature Hydrothermal Method

Pure EuBO3 polycrystals were prepared by hydrothermal method. The crystal structure, morphology, valence state and luminescence property were investigated via X-ray diffractometer(XRD), scanning electron microscope(SEM), X-ray photoelectron spectrometer(XPS) and photoluminescence(PL) spectrometer, respectively. The results indicate that the crystal structure of sample is hexagonal and the morphologies can be manipulated under different alkalinity condition. The orientation of the samples is along [100] and [002] direction when NaOH or NH3·5H2O is used as mineralizer, respectively. Tunable luminescence property was observed by varying the excitation wavelength. Red light can be generated when the sample was excited with a 270 nm light. Because of mixed valence of the Eu, EuBO3 presents blue emission under the excitation wavelength of 360 nm.