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Excitation power dependent population pathways and absolute quantum yields of upconversion nanoparticles in different solvents

Würth, C. ; Kaiser, M. ; Wilhelm, S. ; Grauel, B. ; Hirsch, T. ; Resch-Genger, U.


The rational design of brighter upconversion nanoparticles (UCNPs) requires a better understanding of the radiationless deactivation pathways in these materials. Here, we demonstrate the potential of excitation power density (P)-dependent studies of upconversion (UC) luminescence intensities, slope factors, and absolute quantum yields (Phi(UC)) of popular beta-NaYF4: 20% Yb3+, 2% Er3+ UCNPs of ...


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