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(a) Hydrodynamic sizes of UCNP–GMA–PEG via PEG-DA concentration, measured by dynamic light scattering; TEM images of nanoparticles: (b) UCNP–GMA; (c) UCNP–GMA–PEG, 60 μM PEG-DA; (d) UCNP–GMA–PEG, 100 μM PEG-DA. GMA = glycidyl methacrylate; PEG = polyethylene glycol; PEG-DA = polyethylene glycol diacrylate.
