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Multiband emission from single β-NaYF4(Yb,Er) nanoparticles at high excitation power densities and comparison to ensemble studies

Frenzel, Florian ; Würth, Christian ; Dukhno, Oleksii ; Przybilla, Frédéric ; Wiesholler, Lisa M. ; Muhr, Verena ; Hirsch, Thomas ; Mély, Yves ; Resch-Genger, Ute


Ensemble and single particle studies of the excitation power density (P)-dependent upconversion luminescence (UCL) of core and core-shell beta-NaYF4:Yb,Er upconversion nanoparticles (UCNPs) doped with 20% Yb3+ and 1% or 3% Er3+ performed over a P regime of 6 orders of magnitude reveal an increasing contribution of the emission from high energy Er3+ levels at P > 1 kW/cm(2). This changes the ...


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