The role of oxygen vacancy in the photoluminescence property at room temperature of the CaTiO3

Abstract

In this paper, electron paramagnetic resonance, photoluminescence ͑PL͒ emission, and quantum mechanical calculations were used to observe and understand the structural order-disorder of CaTiO 3 , paying special attention to the role of oxygen vacancy. The PL phenomenon at room temperature of CaTiO 3 is directly influenced by the presence of oxygen vacancies that yield structural order-disorder. These oxygen vacancies bonded at Ti and/or Ca induce new electronic states inside the band gap. Ordered and disordered CaTiO 3 was obtained by the polymeric precursor method.

Structural refinement and photoluminescence properties of irregular cube-like (Ca1−xCux)TiO3 microcrystals synthesized by the microwave–hydrothermal method

“…Fig. 6(a) illustrates the pre-edge region ( ) situated at around 4.040 eV and the XANES spectra of the CaTiO 3 and (Ca 1Àx Cu x )TiO 3 microcrystals presents a similar profile as reported by our research group [31,32].…”

“…The XANES analyses were usually performed as a semiquantitative technique to get information about changes in the coordination of titanates lattice formers as well as the lattice modifiers [11,31,32]. Fig.…”

Novel Gd(OH)3, GdOOH and Gd2O3 Nanorods: Microwave-Assisted Hydrothermal Synthesis and Optical Properties

“…As shown before, the band gap values of the GdOOH and Gd 2 O 3 samples were lower than those presented by Gd(OH) 3 . Studies on intermediate levels in band gap and structural order-disorder showed a decrease in the optical band gap according to the structural organization 41 . Our group has postulated that the PL intensity in inorganic oxides is also associated with the thermal treatment history, structural order-disorder, and electronic levels in the band gap 41,14 .…”

“…Studies on intermediate levels in band gap and structural order-disorder showed a decrease in the optical band gap according to the structural organization 41 . Our group has postulated that the PL intensity in inorganic oxides is also associated with the thermal treatment history, structural order-disorder, and electronic levels in the band gap 41,14 . Moreover, an earlier study has demonstrated the synthesis of rare-earth doped Gd 2 O 3 nanoparticles 42 .…”

Investigation of structural and optical properties of CaTiO3 powders doped with Mg2+ and Eu3+ ions

“…From X-ray absorption spectroscopy technique (XAS), Milanez et al [33] For CaTiO 3 powders prepared by microwave assisted hydrothermal method, Moreira et al [35] observed that the distortion degree of (a) angle between [TiO 6 ] complex clusters is influenced by experimental conditions. Oliveira et al [31], also showed that distortion degree can also affected by doping elements, such as Cu 2þ ions, in the A-site of CaTiO 3 matrix.…”