Ultrasensitive and Adjustable Nanothermometers Based on Er³⁺-Sensitized Core@Shell Nanoparticles for Use in the First Biological Window

In recent years, intensive research has focused on lanthanide-doped nanoparticles (NPs) used as noncontact temperature sensors, particularly in nanomedicine. These NPs must be capable of excitation and emission within biological windows, where biological materials usually show better transparency for radiation. In this article, we propose that NPs sensitized with Er