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Herein, a novel synthesis method of colloidal GdPO 4 :Mn 2+ ,Eu 3+ nanoparticles for luminescent nanothermometry is proposed. XRD, TEM, DLS, and zeta potential measurements confirmed the crystallographic purity and reproducible morphology of the obtained nanoparticles. The spectroscopic properties of GdPO 4 :Mn 2+ ,Eu 3+ with different amounts of Mn 2+ and Eu 3+ were analyzed in a physiological temperature range. It was found that GdPO 4 :1%Eu 3+ ,10%Mn 2+ nanoparticles revealed extraordinary performance for noncontact temperature sensing with relative sensitivity S R = 8.88%/°C at 32 °C. Furthermore, the biocompatibility and safety of GdPO 4 :15%Mn 2+ ,1%Eu 3+ was confirmed by cytotoxicity studies. These results indicated that colloidal GdPO 4 doped with Mn 2+ and Eu 3+ is a very promising candidate as a luminescent nanothermometer for in vitro applications.

nanomaterials

Synthesis, Cytotoxicity Assessment and Optical Properties Characterization of Colloidal GdPO4:Mn2+, Eu3+ for High Sensitivity Luminescent Nanothermometers Operating in the Physiological Temperature Range