کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1518715 1511616 2007 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A new photoluminescence emission peak of ZnO–SiO2 nanocomposites and its energy transfer to Eu3+ ions
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
A new photoluminescence emission peak of ZnO–SiO2 nanocomposites and its energy transfer to Eu3+ ions
چکیده انگلیسی

This work reports a new photoluminescence (PL) emission peak at about 402 nm from amorphous ZnO nanoparticles in a silica matrix, and the energy transfer from it to Eu3+ ions. The amorphous ZnO–SiO2 nanocomposites were prepared by the sol–gel method, which is verified by X-ray diffraction (XRD) profiles and FT–IR spectra. The luminescence emission spectra are fitted by four Gauss profiles, two of which at longer wavelength are due to the defects of the material and the others to amorphous ZnO nanoparticles and the Zn–O–Si interface state. With the reduction of Zn/Si ratio and diethanolamine, the relative intensities of visible emission decrease. The weak visible emission is due to the reduction of defects after calcined at high temperature. The new energy state at the Zn–O–Si interface results in strong emission at about 402 nm. When Eu3+ ions are co-doped, weak energy transfer from ZnO–SiO2 nanocomposites to Eu3+ emission are observed in the excitation spectra.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Physics and Chemistry of Solids - Volume 68, Issue 7, July 2007, Pages 1359–1363
نویسندگان
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