Fotoluminescência sintonizável de LaPO4:Eu3+/Tb3+ hierarquicamente nanoestruturados, sintetizados via rota do etileno glicol assistida por micro-ondas
OLIVEIRA, Rosivânia Silva de. Fotoluminescência sintonizável de LaPO4:Eu3+/Tb3+ hierarquicamente nanoestruturados, sintetizados via rota do etileno glicol assistida por micro-ondas. 2016. 94f. Dissertação (Mestrado em Química) - Centro de Ciências Exatas e da Terra, Universidade Federal do Rio Grande do Norte, Natal, 2016.
Oliveira, Rosivânia Silva de
Hierarchically Nanostructured LaPO4:Eu3+/Tb3+ powders were synthesized by the combined action of microwave heating and a bifunctional solvent (ethylene gly-col), which act as both, solvent and capping agent. Five samples were prepared with different amounts of europium and terbium - La0.93Eu0.07PO4, La0.93Tb0.07PO4, La0.93Eu0.006Tb0.064PO4, La0.93Eu0.011Tb0.059PO4, La0.93Eu0.017Tb0.053PO4 - and the pure matrix. These samples, in powder form, were characterized by X-ray Diffraction (XRD), Attenuated total reflectance Fourier transform infrared spectroscopy (FTIR-ATR), Transmission Electron Microscopy (TEM) and Photoluminescence (PL). The results indicate the crystallization structure of the monoclinic monazite type. Also suggests a hierarchical organization of nanoparticle aggregates formed by seed crys-tals. The co-doped samples exhibited self-activated blue luminescence of the host matrix, as well as red and green emissions from Eu3+ and Tb3+ions, respectively. The spectroscopic analysis suggests that the transfer of energy between the ions occurs from terbium to europium, but the opposite was not observed. Moreover, the variation of the relative concentration of these ions enabled the tuning emissions. Thus, we can say that the chosen synthetic route is efficient in the preparation of nanomateri-als with advanced optical properties and potential applications in photonics, sensing, and biolabeling.