Synthesis and Application in Anticounterfeiting of RGB Upconversion Nanoparticles

<div>(a) The XRD of NaYF<sub>4</sub>:Yb<sup>3+</sup>,Er<sup>3+</sup> NPs and a standard card (JCPDS: 28-1192). (b) The SEM image of NaYF<sub>4</sub>:Yb<sup>3+</sup>,Er<sup>3+</sup> NPs.</div>

Journal of Nanomaterials

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Figure 3

Figure 3: Synthesis and Application in Anticounterfeiting of RGB Upconversion Nanoparticles 