کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9586315 | 1505938 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of Cr doping on the optical characteristics of PbWO4 crystals
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Effects of Cr doping on the optical characteristics of PbWO4 crystals Effects of Cr doping on the optical characteristics of PbWO4 crystals](/preview/png/9586315.png)
چکیده انگلیسی
We report here the optical properties of PWO crystals doped with Cr3+ at a series of concentration levels. It is found that deep traps diminish and the luminescence deteriorates with the addition of Cr3+ ion, which is interpreted by the combined effects of self-absorption, large distortion of WO4 tetrahedron and the formation of “killing site”, defect pairs [2(Cr3+Pb)·-(Cr4+W)â³]. Upon doping at low concentration, the violet-shift of optical absorption edge occurs and it is explained by ion polarization effect. Cr3+ is suggested to substitute for Pb2+ and results in the relaxation of crystal lattice, which is confirmed by Raman spectra. When heavily doped, some Cr go into W-site in the form of Cr4+ in addition to (Cr3+Pb) to keep the charge neutrality and scheelite-type structure integrity. It seems that W6+ tetrahedral site is suitable for hosting Cr4+, which is an important laser active ion.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 113, Issues 1â2, May 2005, Pages 109-114
Journal: Journal of Luminescence - Volume 113, Issues 1â2, May 2005, Pages 109-114
نویسندگان
Weifeng Li, Xiqi Feng, Yidong Huang, Zundu Luo, Wenliang Zhu,