Abstract
YF3 has useful physico-chemical properties such as low refractive index, low phonon energies, large infrared (IR) transparency and wide band gap, making it one of the most interesting materials with optical and optoelectronic functionalities. Among different applications, YF3 appears very promising as a host matrix for lanthanide (Ln) ion doping, in particular for up-conversion photoluminescence (UCPL). In the present study, YF3 has been synthesized via a fluorolytic sol-gel (SG) route leading to a precursor solution of yttrium trifluoroacetate (Y-TFA), from which YF3 and other oxidized derivatives can be obtained by thermal decomposition. The influence of temperature on the phases obtained was investigated by Differential Scanning Calorimetry (DSC), together with an in-depth study of the crystallite sizes by Scanning Electron Microscopy (SEM) and X-ray diffraction (XRD). Representative NIR to visible UCPL spectra excited at 980 nm are presented for Er and Er/Yb-doped YF3 and the corresponding UC mechanisms are discussed based on 980 nm laser power dependence plots. Moreover, an internal standard method is utilized to compare YF3 with other selected oxide matrices for lanthanides, namely aluminosilicate glass (90 SiO2-10 AlO1.5), titania (TiO2) and yttria (Y2O3).
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