کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1496683 | 992972 | 2007 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Preparation and luminescence properties of Eu2+ in SiO2 xerogels
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Al-doped and B, Al co-doped SiO2 xerogels with Eu2+ ions were prepared only by sol-gel reaction in air without reducing heat-treatment or post-doping. The luminescence characteristics and mechanism of europium doping SiO2 xerogels were studied as a function of the concentration of Al, B, the europium concentration and the host composition. The emission spectra of the Al-doped and B, Al co-doped samples all show an efficient emission broad band in the blue violet range. The blue emission of the Al-doped sample was centered at 437Â nm, whereas the B, Al co-doped xerogel emission maximum shifted to 423Â nm and the intensity became weaker. Concentration quenching effect occurred in both the Al-doped and B, Al co-doped samples, which probably is the result of the transfer of the excitation energy from Eu2+ ions to defects. The highest Eu2+ emission intensity was observed for samples with the Si(OC2H5)4:C2H5OH:H2O molar ratio of 1:2:4.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optical Materials - Volume 29, Issue 11, July 2007, Pages 1327-1331
Journal: Optical Materials - Volume 29, Issue 11, July 2007, Pages 1327-1331
نویسندگان
Xiaoyun Hu, Jun Fan, Ting Li, Dekai Zhang, Weizong Chen, Jintao Bai, Xun Hou,