Fig. 2From: 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 visible UCL and NIR DCL spectra of SrF2:Yb3+/Ho3+ (12/x mol%) NCs doped with different Ho3+ concentrations under the excitation of 980 nm CW laserBack to article page