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In this work, it was studied the optimization of the synthesis of KY3F10 nanocrystals by the coprecipitation method using rare earth oxides ( TR2O3 ) dissolved in HCl or their chlorides (TRCl3), potassium fluoride (KF) and ammonium bifluoride (NH4HF2) as starting materials. The initial composition of the precursor reagents in molar proportions of 1KF:1YCl3:3NH4.HF2 was established for obtaining single-phase material. It was also established that the concentration reduction by evaporation of the ammonia contained in the ammonium bifluoride aqueous solution was essential to ensure the success of this route. Pure and doped nanopowders were characterized related to crystal structure, size and shape of the crystallites and to the presence of secondary phases. Agglomerates containing approximately spherical nanocrystals with size of around 10 nm were obtained. The incorporated dopants were studied by optical emission and their energy transfer mechanisms were compared to those obtained in volumetric crystals. Through this study, it was possible to determine the emission efficiency of KY3F10:Er, KY3F10:Nd , KY3F10:Eu and KY3F10:Yb:Nd:Tm with respect to the nanocrystals size and to the precursor reagents adsorption effect. The blue emission of Thulium (Tm) by upconversion in triply doped samples (Yb/Nd/Tm) was successfully obtained with excitation at 802 nm. A preliminary study was made of the dosimetric properties by detecting the thermoluminescence of irradiated pellets with gamma radiation and the curves showed peaks around 180°C and 225°C, moreover, reproducibility and linearity of the response to the doses applied were checked.

Síntese de nanocristais de KY3F10 pelo método de co-precipitação visando aplicações ópticas