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 [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.5935/0103-5053.20150229; http://hdl.handle.net/11449/177575
• topic: Defect emissions; Lanthanide elements; Luminescence; Nanophosphors; Spectroscopy

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.