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Yb3+, Er3+ co-doped Gd2(WO4)3 and Gd2WO6 phosphors have been prepared using co-precipitation method and characterized by X-ray diffraction and optical and infrared spectroscopy. Different processes of upconverted transitions have been observed in the two hosts. Strong green and red emissions have been respectively detected in Gd2(WO4)3:Yb3+, Er3+ and Gd2WO6:Yb3+, Er3+ upon excitation at 980nm, suggesting...
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