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Optical properties of the SiO2-coated Y2O3:Tb3+ nanophosphors. (a) Excitation spectrum monitoring the emission at 547 nm. (b) Emission spectra upon excitation at 276 nm (solid blue line) or 405 nm (dashed blue line). The strongest emission peak is at 547 nm corresponding to bright green color, as seen also in the inset (image obtained under excitation at 254 nm).
