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The up-conversion (UC) fluorescence performance of Er3+: Gd2SiO5 and Er3+: Yb3+: Gd2SiO5 powders prepared by combustion synthesis was investigated under near-infrared (λ=975nm) continuous wave laser excitation. The surface morphology and structure of the powders were studied with scanning electronic microscopy (SEM), energy dispersive X-ray spectroscopy (EDXS) and X-ray powder diffraction (XRPD)....