Fig. 3From: Boltzmann- and Non-Boltzmann-Based Thermometers in the First, Second and Third Biological Windows for the SrF2:Yb3+, Ho3+ Nanocrystals Under 980, 940 and 915 nm ExcitationsThe energy level diagram for SrF2:Yb3+/Ho3+ NCs excited at 980 nm. The corresponding processes of ET, ESA, CR and NRT are also providedBack to article page