Figure 1
Energy levels of the Er3+ and Yb3+ ions and energy transfer processes under 980 (left), 1550 (middle) and 800 (right) nm excitations.
Figure 1 | Scientific Reports
Energy levels of the Er3+ and Yb3+ ions and energy transfer processes under 980 (left), 1550 (middle) and 800 (right) nm excitations.
