NANO PARTICLES OF LUMINESCENT LANTHANIDE MATERIALS

GOMEZ, GERMÁN E.; TORRES DELUIGI, MARÍA R. ; AYSCUE, R. LEE; LOPEZ CARLOS A.; NARDA, GRISELDA E.; KNOPE, KARAH E.

Ciudad Autónoca de Buenos Aires

Congreso; XV Congresos Interamericano de Microscopía; 2019

CIASEM - SAMIC

The lanthanide ions have fascinating opticalproperties, including brightness and luminescence. Photoexcitation at a certainwavelength of the near infrared followed by luminescence at a shorterwavelength in the visible is a rather unusual process since low energy photonsare "converted" into photons of higher energy. The lanthanideelements manifest this behavior [1], and for this reason they are used inmultiple technological applications, such as: lighting devices (economicluminescent lamps, light emitting diodes), television and computer screens,optical fibers, optical amplifiers and lasersIt was successfully synthesized bulk samples ofCa1-2xLnxNaxWO4 with x = 0 and 0.1 and Ln = Eu, Sm as crystalline whitepowders. For the synthesis a mechanical-thermal method was applied, and thestructure of the schelite (CaWO4) was used as the receiving matrix. Then, toobtain the nanoparticles (NP) a fine grinding was carried out.The morphology was analyzed by Scanning ElectronMicroscopy (SEM) using a Leo 1450VP microscope with an accelerating voltage of15 kV. It was observed that the NPs have a spherical shape, and that thediameters are on average 300 ± 50 nm and 100 ± 10 nm when the doping is Sm and Eu, respectively(Figure 1).The crystalline structure of the material was analyzedby X-ray diffraction (XRD). The grid parameters were calculated from thespectra obtained by XRD, to perform the calculations the Rietveldt method wasused by refining with the Fullprof program [2]. The calculated size for theCrystalline Domain was 18 nm. In addition, the quantification of luminescence(PL) was performed, and the materials exhibited red (NP- EuCaNaWO4) and orange(NP-SmCaNaWO4) emissions [3]. These results are favorable for the possibilityof using these materials in technological applications.