کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1627467 | 1516454 | 2006 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Energy transfer in calcium tungstate doped with Eu(III) or Tb(III) ions incorporated into silica xerogel
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Energy transfer in calcium tungstate doped with Eu(III) or Tb(III) ions incorporated into silica xerogel Energy transfer in calcium tungstate doped with Eu(III) or Tb(III) ions incorporated into silica xerogel](/preview/png/1627467.png)
چکیده انگلیسی
This paper describes the preparation, optical absorption and photoluminescent properties of (1 â x)CaWO4:xLn(III) (where Ln = Eu or Tb) incorporated into silica xerogel. The photoluminescence behaviour of the inorganic material in rigid matrix was studied by means of luminescence spectroscopy. The excitation spectra of the system (1 â x)CaWO4:xLn(III) show an intense broad band with a maximum at about 240 nm, which is attributed to O â W ligand-metal charge transfer (LMCT) inside the tungstate group. Moreover, lanthanide ions exhibit their characteristic emission in the material owing to an energy transfer from CaWO4 host to them. The energy transfer from WO42â groups to Ln(III) ions is particularly effective for 0.67CaWO4:0.33Eu(III) or 0.95CaWO4:0.05Tb(III) incorporated into SiO2 xerogel. The high emission and easy preparation of these systems make them potential candidates for use as luminescent materials.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 419, Issues 1â2, 10 August 2006, Pages 191-196
Journal: Journal of Alloys and Compounds - Volume 419, Issues 1â2, 10 August 2006, Pages 191-196
نویسندگان
Beata Grobelna, Beata Lipowska, Andrzej M. KÅonkowski,