کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9829734 | 1524497 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Concentration effect of Mn2+ on the photoluminescence of ZnS:Mn nanocrystals
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Mn-doped ZnS nanocrystals of about 3Â nm diameter were synthesized by a wet chemical method. X-ray diffraction (XRD) measurements showed that the nanocrystals have the structure of cubic zinc blende. The broadening of the XRD lines is indicative of nanomaterials. Room temperature photoluminescence (PL) spectrum of the undoped sample only exhibited a defected-related blue emission band. But for the doped samples, an orange emission from the Mn2+ 4T1â6A1 transition was also observed, apart from the blue emission. The peak position (600Â nm) of the Mn2+ emission was shifted to longer wavelength compared to that (584Â nm) of bulk ZnS:Mn. With the increase of the Mn2+ concentration, the PL of ZnS:Mn was significantly enhanced. The concentration quenching effect was not observed in our experiments. Such PL phenomena were attributed to the absence of Mn2+ pairs in a single ZnS:Mn nanocrystal, considering the nonradiative energy transfer between Mn2+ ions based on the Poisson approximation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Crystal Growth - Volume 279, Issues 3â4, 1 June 2005, Pages 454-460
Journal: Journal of Crystal Growth - Volume 279, Issues 3â4, 1 June 2005, Pages 454-460
نویسندگان
W.Q. Peng, S.C. Qu, G.W. Cong, Z.G. Wang,