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Clear sight: The upconversion emission spectra of KMnF3 nanocrystals co-doped with Yb/Er (18:2 mol %; see picture) and Yb/Ho (18:2 mol %) reveal strong single-band emissions. The application of this pure, single-band emission for deep-tissue imaging is demonstrated.
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Wang et al. (2011) studied this question.
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