Photoluminescence at room temperature in polycrystalline BaxSr1−xTiO3 ceramics obtained by solid-state reaction method

Photoluminescence activity of Ba1−xCaxTiO3: dependence on particle size and morphology

“…Oxygen deciency creates intermediate states in the band gap and the excited electrons recombine with holes through these defect levels. 49,50,54,55 In any event, optical properties such as photoluminescence therefore depend on the structural and electronic properties, including compositional ordering and the presence of impurities and defects. Moreover, PL depends on the electronic excitation and is thus an important complement to spectroscopy of these types of excitations, providing local structural information about the neighborhood of luminescent ions, with a completely different character of information obtained by techniques based on diffraction.…”

Photoluminescence at room temperature in Ba0.5Sr0.5TiO3 ceramics

“…In Ba 0.5 Sr 0.5 TiO 3 ceramics, oxygen vacancies should create defect levels in the band gap, which act as a luminescence center in this sample. A recombination process of doped electrons in the forbidden band with holes in conduction band results in the photoluminescence in Ba x Sr 1À x TiO 3 ceramics [7]. As a further work, we plan to calculate the electronic structure of Ba 0.5 Sr 0.5 TiO 3À d to verify the existence of the band gap states.…”

“…Cavalcante et al [6] showed that photoluminescence behavior exists in Ba(Zr 0.25 Ti 0.75 )O 3 thin film, which is formed by substituting Ti atoms on B-site with Zr atoms in ABO 3 perovskite compounds. Our previous experimental results have shown that photoluminescence occurs in the ceramics of Ba x Sr 1 À x TiO 3 (x ¼0.7, 0.8 and 0.9) [7], which substitute the A-site atoms of ABO 3 perovskite compounds.…”

High fluorescence emission of carboxylic acid functionalized polystyrene/BaTiO3 nanocomposites and rare earth metal complexes: Preparation and characterization

“…BTO is able to emit PL phenomenon at room temperature in the form of amorphous powders as well as nanocrystals [6], and PL could result from the effect of either quantum connement or defect. Zhang et al reported polycrystalline Ba x Sr 1-x TiO 3 ceramics show PL at room temperature [7]. Bouma [8] and Zhang et al [9] reported that PL property of BTO is related to short Ti-O atomic distances into the regular octahedral of BTO unit cell and by the charge transfer between titanium and oxygen atoms i.e.…”