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Visible and near-infrared upconversion luminescence from Y2O3 co-doped with Er3+, Yb3+ and Li+ phosphors under continuous excitation with 1532 nm light are reported. The upconversion emissions at 530–570 nm (green light emission region), and 640–700 nm (red light emission region) correspond to transitions from the 4S3/2 to 4I15/2 and (4F9/2 + 4I9/2) to 4I15/2 electronic energy levels of the Er3+ ions...
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