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. 2023 Feb 24;15(9):12171–12188. doi: 10.1021/acsami.2c22000

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© 2023 The Authors. Published by American Chemical Society

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(a) Optical imaging efficiency of the KYF:Er,Yb@KYF:Nd,Yb NPs dispersions in the NIR range (1:1 dilution corresponds to 50 mg mL^–1). (b and c) Evaluation of core@shell Gd³⁺-doped KY₃F₁₀ performance for MRI. Inverse of the longitudinal T₁ and transverse T₂ relaxation times vs the Gd³⁺ concentration. Linear fit for relaxivity determination: red line. Slopes of the fit: (b) r₁ and (c) r₂ relaxation rate constants. (d) Image: X-ray attenuation of KYF core@shell nanoparticles dispersions in a suitable phantom. Graph: interpolation of the X-ray attenuation vs nanoparticles concentration at 40 kVp (the line is a guide for the eye).