Figure 4From: Color-tunable up-conversion emission in Y2O3:Yb3+, Er3+ nanoparticles prepared by polymer complex solution methodUC spectra of NPs in UV-blue spectral region after excitation with 978-nm radiation. Y1.97Yb0.02Er0.01O3 (green line), Y1.94Yb0.05Er0.01O3 (blue line), and Y1.89Yb0.10Er0.01O3 (red line).Back to article page