کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5403729 | 1392765 | 2007 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Studies on the origins of the absorption spectra in PbWO4 crystal
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Studies on the origins of the absorption spectra in PbWO4 crystal Studies on the origins of the absorption spectra in PbWO4 crystal](/preview/png/5403729.png)
چکیده انگلیسی
The electronic structures and absorption spectra for both the perfect PbWO4 (PWO) crystal and the three types of PWO crystals, containing VPb2â, VO2+ and a pair of VPb2â-VO2+, respectively, have been calculated using CASTEP codes with the lattice structure optimized. The calculated absorption spectra indicate that the perfect PWO crystal does not occur absorption band in the visible and near-ultraviolet region. The absorption spectra of the PWO crystal containing VPb2â exhibit seven peaks located at 1.72Â eV (720Â nm), 2.16Â eV (570Â nm), 2.81Â eV (440Â nm), 3.01Â eV (410Â nm), 3.36Â eV (365Â nm), 3.70Â eV (335Â nm) and 4.0Â eV (310Â nm), respectively. The absorption spectra of the PWO crystal containing VO2+ occur two peaks located at 370Â nm and 420Â nm. The PWO crystal containing a pair of VPb2â-VO2+ does not occur absorption band in the visible and near-ultraviolet region. This leads to the conclusions that the 370 and 420Â nm absorption bands are related to the existence of both VPb2â and VO2+ in the PWO crystal and the other absorption bands are related to the existence of the VPb2â in the PWO crystal. The existence of the pair of VPb2â-VO2+ has no visible effects on the optical properties. The calculated polarized optical properties are well consistent with the experimental results.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 126, Issue 1, September 2007, Pages 239-244
Journal: Journal of Luminescence - Volume 126, Issue 1, September 2007, Pages 239-244
نویسندگان
Liu Tingyu, Shen Jianqi, Zhang Qiren, Zhuang Songlin,