Photoluminescence: A probe for short, medium and long-range self-organization order in oxide

Structural conditions that leads to photoluminescence emission in SrTiO3: An experimental and theoretical approach

“…The existence or absence of order or disorder is determined by the balance between these shortrange and long-range repulsions, which favor the ordered or disordered structure and may stabilize the disordered, intermediately ordered, or ordered structure. 65 Even in disordered structures, the short-range repulsions predominate ͓TiO 5 · V O z ͔ ӷ ͓TiO 6 ͔, resulting in a random disorder. Because of the electric dipolar interaction, which, in this case, is a long-range interaction, the effective field approximation can be applied to a model system in which a dielectrically soft local atomic configuration can be identified, albeit possibly distorted in the glassy phase ͑disordered͒.…”

Porous zirconium titanate ceramics synthesized by sol–gel process

“…This is an indicator of luminescence origin of the bands. De Lucena et al 19 show that ZrTiO 4 displays broad band photoluminescence with the maximum around 560 nm, caused by a change in coordination number of titanium and zirconium. Since we observed luminescence at absolute wavenumber of ∼17,900 cm −1 (∼559 nm), it could be caused by electronic transition between new electronic states possibly formed due to oxygen defects inside the pores of the ceramic bodies.…”

Pb1−xCaxTiO3solid solution (x=0.0Lázaro1, Lucena2, Pizani3 et al. 2007Phys. Rev. BSelf Cite164160View full textAdd to dashboardCite

“…[23][24][25][26][27] In a transparent titanium citrate solution prepared from titanium isopropoxide precursor ͑Riedel-de-Haën͒, stoichiometrically proportional amounts of calcium ͑first͒ and lead ͑second͒ acetate were added slowly to the solution under constant stirring and moderate heating until their complete dissolution. Ammonium hydroxide was used to prevent precipitation of lead citrate by adjusting the pH of the cations solution to around 6.0.…”