Beam-profile compensation for quantum yield characterisation of Yb–Tm codoped upconverting nanoparticles emitting at 474 nm, 650 nm and 804 nm

Abstract

A novel method for accurately characterising the power density-dependent quantum yield of UCNPs. The method accounts for the beam profile distortions, which is important for application of UCNPs in various fields, especially for biophotonics.