کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5398750 1505894 2015 19 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Photoluminescence of Cr-doped TiO2 induced by intense UV laser excitation
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Photoluminescence of Cr-doped TiO2 induced by intense UV laser excitation
چکیده انگلیسی
Nanocrystalline anatase (A) and rutile (R) TiO2 were synthesized by the thermal hydrolysis and then were surface doped with Cr ions by adsorption. The samples were characterized by X-ray diffraction, X-ray fluorescence, Raman spectroscopy, optical absorption and photoluminescence (PL) methods. It is found that the PL emission and optical absorption near the band gap edge occur with the same electronic transitions in TiO2. The Cr3+ doping leads to the blue and red shifts of the PL peaks in A/Cr TiO2 due to the Burstein-Moss and band tailing effects, respectively. The Auger type non-radiative recombination in R/Cr TiO2 quenches the PL emission intensity. For anatase samples at low concentrations of Cr ions (0.5 at%) the PL emission increases compared to the undoped A TiO2 due to the formation of additional radiative recombination centers. At higher contents of Cr (1.0 at%), the PL intensity decreases due to the concentration quenching effect.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 166, October 2015, Pages 253-258
نویسندگان
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