Synthesis and luminescent properties of monodispersed spherical Eu(III)-Gd(III)-Ce(IV) oxides.

CECILIA SORBELLO; MATÍAS JOBBÁGY; BEATRIZ CARMEN BARJA

Münster

Conferencia; Rare Earth Elements and Compounds Conference 2012 (REEC); 2012

Lanthanides based luminescent nanostructured materials find a wide variety of applications as phosphors for fluorescent lighting, display devices, X-ray monitoring and imaging, scintillators, analytical assays, and biomedical imaging. Luminescent Tb(III) and Eu(III) phosphates, silicates, aluminates and oxides are used as green and red light sources, respectively. In particular cerium oxides are non-toxic and possess excellent thermal and mechanical stability. As in the case of gadolinium oxide, mutual biocompatibility of their mixtures alsooffer a promising platform for diagnosis applications. In this work, new potential matrices are explored using mixtures of Gd2O3, and CeO2 as confinement sites for the trivalent Eu(III). The emission bands of Eu(III) (4f6) are very narrow (FWHM of a few nm) as a result of the forbidden intra f-f transitions 5D07FJ with J= 0 - 6 (550 nm- 750 nm range) being the band at ca. 610 nm (5D07F2) responsible for the characteristic red color. Additionally, Eu(III) has the capacity to monitor the environment in which it is located as a function of the 5D07F2/ 5D07F1 bands ratio giving the opportunity to obtain structural information of the system under study. With respect to the synthesis of the nanomaterials, particles with controlled morphologies and small sizes are desirable.