Fig. 4From: 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 spectra of SrF2:Yb3+/Ho3+ (12/0.1 mol%) NCs under the 980, 940 and 915 nm excitations, respectivelyBack to article page