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

Hua Feng Pang, Zhi Jie Li, Xia Xiang, Chun Lai Zhang, Yong Qing Fu, Xiao Tao Zu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

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 PbWO 4 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.

Original languageEnglish
Article number116104
JournalChinese Physics B
Volume20
Issue number11
DOIs
Publication statusPublished - 1 Nov 2011
Externally publishedYes

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