To shed more light on the microscopic mechanism of this multi-wavelength emission in Pr3+, different UC fluorescence intensities dependence on laser power are plotted in Figure 2d,e and Figure S6 (Supporting Information).
To shed more light on the microscopic mechanism of this multi-wavelength emission in Pr3+, different UC fluorescence intensities dependence on laser power are plotted in Figure 2d,e and Figure S6 (Supporting Information).