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

doi:10.1088/1674-1056/20/11/116104

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 journal › Article › peer-review

8 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 WO₄^2- 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 language	English
Article number	116104
Journal	Chinese Physics B
Volume	20
Issue number	11
DOIs	https://doi.org/10.1088/1674-1056/20/11/116104
Publication status	Published - 1 Nov 2011
Externally published	Yes

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title = "Effect of annealing on structural and optical properties of lead tungstate microcrystals",

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.",

keywords = "annealing, defects, PbWO microcrystal, photoluminescence",

author = "Pang, {Hua Feng} and Li, {Zhi Jie} and Xia Xiang and Zhang, {Chun Lai} and Fu, {Yong Qing} and Zu, {Xiao Tao}",

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doi = "10.1088/1674-1056/20/11/116104",

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T1 - Effect of annealing on structural and optical properties of lead tungstate microcrystals

AU - Pang, Hua Feng

AU - Li, Zhi Jie

AU - Xiang, Xia

AU - Zhang, Chun Lai

AU - Fu, Yong Qing

AU - Zu, Xiao Tao

PY - 2011/11/1

Y1 - 2011/11/1

N2 - 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.

AB - 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.

KW - annealing

KW - defects

KW - PbWO microcrystal

KW - photoluminescence

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JO - Chinese Physics B

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

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