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Yb,Nd,Er-doped upconversion nanoparticles: 980 nm versus 808 nm excitation

Wiesholler, Lisa M. ; Frenzel, Florian ; Grauel, Bettina ; Würth, Christian ; Resch-Genger, Ute ; Hirsch, Thomas


Yb,Nd,Er-doped upconversion nanoparticles (UCNPs) have attracted considerable interest as luminescent reporters for bioimaging, sensing, energy conversion/shaping, and anticounterfeiting due to their capability to convert multiple near-infrared (NIR) photons into shorter wavelength ultraviolet, visible or NIR luminescence by successive absorption of two or more NIR photons. This enables optical ...


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