Structure and optical properties of cerium(III)-doped PbWO₄ micro-crystals synthesized by a facile wet chemical method

详细信息    查看全文

• 作者：Yan Fang ; Ying Xiong ; Yuanlin Zhou ; Jinxiang Chen ; Kaiping Song ; Yi Fang ; Xulan Zhen
• 关键词：Lead tungstate ; Microcrystal ; Doping ; Optical properties
• 刊名：Solid State Sciences
• 出版年：2009
• 出版时间：June 2009
• 年：2009
• 卷：11
• 期：6
• 页码：1131-1136
• 全文大小：736 K

文摘

Cerium(III) doped PbWO₄ micro-crystals with different doping contents were synthesized via a facile wet chemical method in air atmosphere at room temperature. X-ray diffraction patterns of as-synthesized powders revealed that these micro-crystals were pure scheelite PbWO₄, without any impurities such as Ce₂(WO₄)₃ and PbO, and Ce³⁺ could enter into Pb²⁺ sites, which would induce the formation of lead vacancies in the PbWO₄ crystal lattice. The UV–vis diffuse reflection spectra, Raman spectra and photoluminescence (PL) spectra of doped and pure PbWO₄ micro-crystals were studied in detail, which indicated that optical properties of doped PbWO₄ were greatly changed. The adsorption edge of Ce(III)-doped PbWO₄ micro-crystals would shift toward high wavelength (red-shift) with gradually increasing Ce³⁺ doping concentration. It shows an obvious decrease in blue emission band which made the shape of the whole emission band remodeled with the Ce³⁺ doping.