Synthesis and characterization of SWIR-emitting LaF3 Nd3+ nanoparticles
Keywords:
Nanoparticles , wet chemistry , non radioactive transitionsAbstract
Using the wet chemistry method, LaF3: N d3+ nanoparticles have been synthesized. The X-ray spectra of these nanoparticles show an excellent correspondence with the hexagonal structure of LaF3 reported in the literature. Using Scherrer's formula, the size of these nanoparticles has been estimated at 20nm. The optical absorption spectra verify the presence of N d in these nanoparticles, observing that the most intense band corresponds to the transition 4 I9/2 →4 F7/2, 4 S3/2. By dissolving these nanoparticles in water and irradiating them with a laser of 808nm and 1.7W power, a heating of the liquid was observed, reaching a temperature of 45.2 ◦C, which is not observed when irradiating water without nanoparticles with this laser. This phenomenon is explained by the non-radiative transitions from the 4F3/2 level to lower energy states in the N d3+.
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