Autor(es):
Pereira, Sandra C. ; Figueiredo, Alberthmeiry T. ; Barrado, Cristiano M. ; Stoppa, Marcelo H. ; Dwivedi, Yashashchandra ; Li, Maximo S. ; Longo, Elson [UNESP]
Data: 2018
Identificador Persistente: http://hdl.handle.net/11449/177575
Origem: Oasisbr
Assunto(s): Defect emissions; Lanthanide elements; Luminescence; Nanophosphors; Spectroscopy; Defect emissions; Defect emissions; Lanthanide elements; Lanthanide elements; Luminescence; Luminescence; Nanophosphors; Nanophosphors; Spectroscopy; Spectroscopy
Descrição
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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.
Departamento de Química, Universidade Federal de Goiás - UFG
Departamento de Matemática, Universidade Federal de Goiás - UFG
Physics Department, National Institute of Technology Kurukshetra
Instituto de Física, Universidade de São Paulo - USP
INCTMN, Instituto de Química, Universidade Estadual de São Paulo - UNESP
INCTMN, Instituto de Química, Universidade Estadual de São Paulo - UNESP
