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Optical spectroscopic studies of the influence of size, particle architecture, and surface chemistry of different types of photoluminescent nanocrystals with emission in the vis/NIR will be presented including semiconductor quantum dots and lanthanide-based upconversion nanoparticles. This will include the photophysics of these materials assessed with steady state and time-resolved fluorometry on the ensemble and single particle level and concepts for the quantification of surface groups at nanomaterials with optical methods using cleavable probes and catch-and-release assays.