What upconversion phosphor is this?
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An upconversion (UPC) phosphor that can emit visible light after excitation by near-infrared (NIR) light is an attractive material for biological and medical applications such as bio-imaging because of the low absorption and small scattering of NIR light in living organisms [1], [2], [3].
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Upconversion luminescence of silver nanoparticles (AgNPs) coated NaYF 4:Er 3+ /Yb 3+ phosphor nano-particles.
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