Europium-doped calcium titanate: Optical and structural evaluations

A large red-shift in the photoluminescence emission of Mg 1−x Sr x TiO 3

“…In particular, the infrared emission is a lower energetic emission and can be related to deeper defects in the band gap region which originate due to the presence of a larger concentration of the [TiO 5 …”

“…Perovskite oxides are a fascinating class of multifunctional inorganic materials that have attracted much attention in recent years [1][2][3][4][5][6]. Perovskite structures have the general formula ABO 3 , where the divalent metal (A) is a network modifier and tetravalent metal sites (B) are network formers for these structures [2].…”

“…The Perovskite material ABO 3 structure can adopt five phases, cubic, tetragonal, orthorhombic, trigonal, and monoclinic polymorphs depending on the tilting and rotation of the [BO 6 ] polyhedral clusters in the lattice [3]. In this context, considerable effort has been devoted to the production of perovskite oxide materials with a large variety of morphologies and sizes, due to their high potential for use in lightemitting diodes, photocatalysts, sensors, microwave dielectrics, and photovoltaic applications [4][5][6][7]. Understanding the relationship between the structural and electronic order-disorder effects in the crystalline materials is crucial in designing novel materials with tunable physical and chemical properties [8,9].…”

“…In particular, the photoluminescence (PL) properties are an important quantum optical phenomenon and are one of the most powerful methods for studying the order-disorder effects in semiconductors [8,9]. The doping process in semiconductors often causes significant alterations in the structural and electronic properties of these materials, and is the most promising strategy to further enhance their properties and applications in materials science [5,6,[15][16][17]. However, few studies have been reported on near-infrared (NIR) emissions for such particles [14].…”

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

“…The excess of positive charge can be compensated by intertitals defects, when Ti 4þ sites are substituted by Al 3þ ions, improving its optical properties. Mazzo et al [39] also noticed an improvement in local order-disorder degree by creation of cations or oxygen vacancies with substitution of Eu 3þ ions in both A and B sites of CaTiO 3 matrix. This factor also provided significant changes in local order-disorder degree around Ca and Ti clusters.…”