Stochastic dynamics 4 Upconversion nanoparticles 4 Article 2 Brownian dynamics simulations 2 Diffusion 2 Dynamics 2 Erbium 2 Fluorescence 2 Fluorescence upconversion 2 High-resolution scanning electron microscopies 2 Light scattering 2 Microscopy 2 Nanoparticles 2 Scanning electron microscopy 2 Stochastic systems 2 Suspensions (fluids) 2 Time-dependent diffusion coefficient 2 Trajectories 2 Two-dimensional trajectory 2 Viscoelasticity 2 Ytterbium 2 Zeta potential measurements 2 image reconstruction 2 lanthanide 2 light absorption 2 linear system 2 multiphoton microscopy 2 nonlinear system 2 photodynamics 2 polarimetry 2