Polarization of the Luminescence of Upconversion YNaF 4 :Yb,Tm Single Nanoparticles

Solvothermal technology is used to synthesize YNaF 4 :Yb,Tm nanoparticles. Under the impact of laser radiation at a wavelength of 980 nm, the nanoparticles exhibit strong upconversion luminescence that corresponds to the emission of Tm 3+ ions as a consequence of energy being transferred from Yb 3+ ions. Recordings of the emission of single nanoparticles show the spectral lines at wavelengths of 480 and 495 nm are characterized by different polarizations.