کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1609129 1516258 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Microstructure control by Y3+ ions doping in CaMoO4:Eu3+: Tunable optical and luminescent performance
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Microstructure control by Y3+ ions doping in CaMoO4:Eu3+: Tunable optical and luminescent performance
چکیده انگلیسی


• The lattice contracted with the increase of the concentration of Y3+ co-doped.
• A red shift of electronic absorption band of the 1A1 → 1T1 transition was observed.
• Quantum efficiency was enhanced at the appropriate concentration of Y3+ co-doped.
• Y3+ co-doped was favorable to improve the color purity of CaMoO4:Eu3+ crystals.

In this paper, Y3+ ions doped CaMoO4:Eu3+ with controlled microstructures were prepared via a hydrothermal method. All samples were fully characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), UV–vis diffuse reflectance spectroscopy, and photoluminescence measurement. The luminescent performance improvement aroused by doping was systematically investigated after inducing Y3+ as co-doping ions in CaMoO4:Eu3+ lattice. It is found that the lattice of Y3+ doped CaMoO4:Eu3+ nanocrystals contracted with increasing the Y3+ concentration, resulting in a red shift of 1A1 → 1T1 transition from the valence band to the conduction band. Meanwhile, excitation band at 300 nm corresponding to the typical 1A1 → 1T1 transition also shifted to lower energy, originating from the charge-transfer between MoO42− group and Eu3+ ions. When the Y3+ doping concentration was less than 0.05, the quantum efficiency of Y3+ doped CaMoO4:Eu3+ nanocrystals was all superior to pure CaMoO4:Eu3+ nanocrystals, which can be assigned to the lattice structure contraction, co-doping effect, doping concentration variation. However, as the content of Y3+ ions further increasing, Y3+ ion should act as a luminescence killer, and therefore resulting in a nonradiative de-excitation.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 635, 25 June 2015, Pages 25–33
نویسندگان
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