ÓXIDO DE ÍTRIO E ALUMÍNIO DOPADO COM Yb3+ E Er3+ INCORPORADO EM MEMBRANA DE POLIAMIDA

• Autor(a) principal: Souza,Michel L. de
• Data de Publicação: 2018
• Outros Autores: Moscardini,Susane B., Faria,Emerson H. de, Ciuffi,Katia J., Rocha,Lucas A., Nassar,Eduardo J., Silva,Jorge V. L., Oliveira,Marcelo F., Maia,Izaque A.
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Química Nova (Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422018000500519
• topic: additive manufacture; photodynamic therapy; lanthanoide; upconversion

Lanthanide ions have special light emission, which can occur through descending and ascending energy conversion. Ascending energy conversion is especially interesting for bioapplications because excitation in the infrared region does not excite biomolecules and therefore does not interfere in detection, not to mention that it penetrates deeper in the skin. Here, we synthesized yttrium and aluminum oxide doped with Yb3+and Er3+ions via the non-hydrolytic sol-gel methodology. The doped matrix was incorporated and dispersed over a polyamide membrane obtained by Additive Manufacturing. X-ray diffraction revealed that a mixture of yttrium aluminum monoclinic and garnet phases emerged. Upon excitation at 980 nm in the Yb3+ion, the Er3+ presented more intense emission as a function of the laser power, which favored red emission. The intensities of the bands corresponding to the 4S3/2 → 4I15/2 (563 nm) and 5F9/2 → 4I15/2 (660 nm) transitions involved the absorption of two photons. The oxide incorporated into the polyamide membrane presented the same behavior. After coating with polyetherimide, the latter system was resistant to 5.1 W laser, which paves the way for new applications.