Author(s): Pereira,Sandra C. ; Figueiredo,Alberthmeiry T. ; Barrado,Cristiano M. ; Stoppa,Marcelo H. ; Dwivedi,Yashashchandra ; Li,Maximo S. ; Longo,Elson
Date: 2015
Origin: Oasisbr
Subject(s): luminescence; spectroscopy; lanthanide elements; defect emissions; nanophosphors; luminescence; luminescence; spectroscopy; spectroscopy; lanthanide elements; lanthanide elements; defect emissions; defect emissions; nanophosphors; 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.
