白果形钨酸铅的可控合成及光致发光特性

Controlled Synthesis and Luminescence Properties of Ginkgo-Like PbWO_4

以酒石酸钠为表面活性剂,采用直接沉淀法合成了白果形钨酸铅晶体,通过扫描电子显微镜(SEM)、X射线衍射(XRD)、能量散射仪(EDS)及荧光发射光谱(PL)对产物的结构和性质进行了表征。探讨了酒石酸钠对(004)晶面的抑制作用以及pH值和陈化温度对产物形貌的影响,结合晶体的内部结构提出了产物可能的形成机制。结果表明,陈化温度为30℃时,晶体形貌最为规整,PbWO4晶体在紫外光激发下展现出强的绿光发射,在pH=9时可达到最大的发光强度。

In this paper, Ginkgo-like PbWO4 has been synthesized using direct precipitation method, taking sodium tartrate as the surfactant. The structure and property of synthesized products have been characterized by combination of scanning electron microscope （SEM）, X-ray power diffraction （XRD）, energy dispersive X-ray spectroscopy （EDS） and fluorescence emission spectra （PL）. Investigations were carried out on the sodium tartrates inhibitory effect on the crystal face（004）, and the impact of pH value and aging temperature on products morphology. A probable mechanism for products formation is proposed based on the internal crystal structure analysis. The results indicated that the most uniform crystal morphology will be obtained at the aging temperature of 30 ℃. PbWO4 crystal presented intense green emission under ultraviolet excitation, which will reach a maximum luminous intensity at pH=9.