Abstract
Small, functional nanomaterials are extensively studied due to their unique optoelectronic, magnetic, and structural properties. Lanthanide-based luminescent nanoparticles (NPs) exhibit multicolor emission under ultraviolet and near-infrared (energy upconversion) light, long radiative lifetimes, and narrow emission bands corresponding to 4f–4f transition within Ln3+ ions. Alike high pressure and temperature affect the luminescence properties of the lanthanide-doped (Ln3+) nanomaterials, leading to the spectral shift of their absorption/emission bands, changes in band ratio (luminescence intensity ratio), luminescence lifetimes, bandwidth, etc. These changes can be used for remote, noncontact pressure, and temperature sensing purposes, where Ln2+/3+-doped NPs can work as optical pressure sensors (nanomanometers) and temperature sensors (nanothermometers), in nanomanometry and nanothermometry, respectively. Small size of the NPs allows their use in various bioapplications, for example, for thermal sensing, bioimaging, and hyperthermia treatment, and in other applications requiring high spatial resolution, for example, in detection of local pressure/temperature of the system in submicro-sized regions.
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