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Visible upconversion emission intensities are investigated in Er3+-doped Y2O3 nanocrystals.We also find that the upconversion intensity varies nonlinearly with the excitation power with a threshold of 110 mW,which indicates that the green and red emissions would be photon avalanche upconversion when the excitation power exceeds the threshold.
Visible upconversion emission intensities are investigated in Er3 + -doped Y2O3 nanocrystals. We also find that the upconversion intensity varies nonlinearly with the excitation power with a threshold of 110 mW, which indicates that the green and red emissions would be photon avalanche upconversion when the excitation power超过 the threshold.