中国物理B ›› 2011, Vol. 20 ›› Issue (11): 116104-116104.doi: 10.1088/1674-1056/20/11/116104

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

庞华锋1, 李志杰1, 向霞1, 章春来1, 祖小涛2, 傅永庆3   

  1. (1)Department of Applied Physics, University of Electronic Science and Technology of China, Chengdu 610054, China; (2)Department of Applied Physics, University of Electronic Science and Technology of China, Chengdu 610054, China; International Center for Material Physics, Chinese Academy of Sciences, Shenyang 110015, China; (3)Thin Film Centre, Scottish Union of Physics Alliance, University of the West of Scotland, Paisley, PA1 2BE, UK
  • 收稿日期:2011-03-27 修回日期:2011-06-19 出版日期:2011-11-15 发布日期:2011-11-15
  • 基金资助:
    Project 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), and the Royal Academy of Engineering-Research Exchanges with China and India Awards in UK.

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

Pang Hua-Feng(庞华锋)a), Li Zhi-Jie(李志杰) a), Xiang Xia(向霞)a)b), Zhang Chun-Lai(章春来)a), Fu Yong-Qing(傅永庆) c), and Zu Xiao-Tao(祖小涛)a)b)†   

  1. a Department of Applied Physics, University of Electronic Science and Technology of China, Chengdu 610054, China; b International Center for Material Physics, Chinese Academy of Sciences, Shenyang 110015, China; c Thin Film Centre, Scottish Union of Physics Alliance, University of the West of Scotland, Paisley, PA1 2BE, UK
  • Received:2011-03-27 Revised:2011-06-19 Online:2011-11-15 Published:2011-11-15
  • Supported by:
    Project 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), and the Royal Academy of Engineering-Research Exchanges with China and India Awards in UK.

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摘要： Shuttle-like lead tungstate (PbWO4) 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

Abstract: Shuttle-like lead tungstate (PbWO4) 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.

Key words: PbWO4 microcrystal, annealing, defects, photoluminescence

中图分类号:  (Kinetics of defect formation and annealing)

  • 61.72.Cc
71.55.Ht (Other nonmetals) 71.70.Ej (Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect)