Fig. 1From: 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 ExcitationsTEM images of SrF2:Yb3+/Ho3+(12/x mol%) NCs, a x = 0.1, b x = 0.2, c x = 0.6, d x = 1.2, e x = 2.0. f The particle size distribution of SrF2:Yb3+/Ho3+ (12/0.1 mol%) NCs. g XRD patterns of SrF2:Yb3+/Ho3+ (12/x mol%) NCs doped with different Ho3+ concentrationsBack to article page