Effect of annealing on structural and optical properties of lead tungstate microcrystals  

作　　者：庞华锋 李志杰 向霞 章春来 傅永庆 祖小涛 

机构地区：[1]Department of Applied Physics,University of Electronic Science and Technology of China [2]International Center for Material Physics,Chinese Academy of Sciences [3]Thin Film Centre,Scottish Union of Physics Alliance,University of the West of Scotland

出　　处：《Chinese Physics B》2011年第11期397-403,共7页中国物理B（英文版）

基　　金：supported by the Fundamental Research Funds for the Central Universities,China(Grant Nos.ZYGX2009J046 and ZYGX2009X007);the Sichuan Provincial Young Scientists Foundation,China(Grant No.2010JQ0006);the Royal Society-Research Grant,UK(Grant No.RG090609);the Royal Academy of Engineering-Research Exchanges with China and India Awards in UK

摘　　要：Shuttle-like lead tungstate （PbWOa） microcrystals are synthesized at room temperature using the precipitation method with the cetyltrimethyl ammonium bromide. Results from both the X-ray diffraction and the scanning electron microscopy show that the lattice distortions of the PbWO4 microcrystals are reduced significantly when the annealing temperature is increased to 873 K. The result from the ultraviolet-visible diffuse reflectance spectroscopy shows that the exciton absorption appears in the sample annealed at 673 K. The self-trapped exciton luminescence due to the Jahn- Teller effect is also observed in the blue band. The interstitial oxygen ions in the WO42- groups are mainly resposible for the enhancement effect of the green luminescence of the annealed samples. The above results are supported by the spectrum analysis of the as-grown and the post-annealed samples using the X-ray photoelectron spectroscopy.Shuttle-like lead tungstate （PbWOa） microcrystals are synthesized at room temperature using the precipitation method with the cetyltrimethyl ammonium bromide. Results from both the X-ray diffraction and the scanning electron microscopy show that the lattice distortions of the PbWO4 microcrystals are reduced significantly when the annealing temperature is increased to 873 K. The result from the ultraviolet-visible diffuse reflectance spectroscopy shows that the exciton absorption appears in the sample annealed at 673 K. The self-trapped exciton luminescence due to the Jahn- Teller effect is also observed in the blue band. The interstitial oxygen ions in the WO42- groups are mainly resposible for the enhancement effect of the green luminescence of the annealed samples. The above results are supported by the spectrum analysis of the as-grown and the post-annealed samples using the X-ray photoelectron spectroscopy.

关 键 词：PbWO4 microcrystal ANNEALING DEFECTS PHOTOLUMINESCENCE 

分 类 号：O482.3[理学—固体物理]