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Particle-size-dependent upconversion luminescence of NaYF4: Yb, Er nanoparticles in organic solvents and water at different excitation power densities

Kraft, Marco ; Würth, Christian ; Muhr, Verena ; Hirsch, Thomas ; Resch-Genger, Ute


A systematic study of the luminescence properties of monodisperse beta-NaYF4: 20% Yb3+, 2% Er3+ upconversion nanoparticles (UCNPs) with sizes ranging from 12-43 nm is presented utilizing steady-state and time-resolved fluorometry. Special emphasis was dedicated to the absolute quantification of size- and environment-induced quenching of upconversion luminescence (UCL) by high-energy O-H and C-H ...


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