Facile Microwave-Assisted Synthesis of Lanthanide Doped CaTiO3 Nanocrystals

• Autor(a) principal: Pereira,Sandra C.
• Data de Publicação: 2015
• Outros Autores: Figueiredo,Alberthmeiry T., Barrado,Cristiano M., Stoppa,Marcelo H., Dwivedi,Yashashchandra, Li,Maximo S., Longo,Elson
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Journal of the Brazilian Chemical Society (Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532015001102339
• topic: luminescence; spectroscopy; lanthanide elements; defect emissions; nanophosphors

This article discusses a simple approach for the microwave-assisted synthesis of good quality nanosized calcium titanate crystals doped with trivalent Tm and Yb lanthanide ions. The prepared nanoparticles had a microcube-like structure and a crystallite size of ca. 47 nm. The structure of the nanocrystals was analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM), and their spectroscopic behavior was examined at a laser excitation wavelength of 350.7 nm. It was found that doping CaTiO3 nanocrystals with Yb and Tm leads to about 250-fold brighter photoluminescence (PL) emissions in the blue and near-infrared regions than that emitted by pure CaTiO3 nanocrystals. The PL emission was correlated with the structural disorder.