Visible photoluminescence in amorphous ABO3 perovskites

Abstract

The photoluminescence observed in ABO3 type perovskite in their highly structural disordered state can be explained by a model in which is assumed a distribution of electronic states localized within the energy band gap coupled to lattice local vibrational states. The model fits very well the experimental results and indicates that photoluminescence in the visible region can be considered as a general behavior of disordered solids.

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

“…[22][23][24] This emission was attributed to localized levels above the valence band ͑VB͒ and below the conduction band ͑CB͒. Moreover, a charge transfer occurred from the ͓TiO 6 ͔ cluster to the ͓TiO 5 ͔ cluster in the disordered system.…”

Intense blue and green photoluminescence emissions at room temperature in barium zirconate powders

“…This characteristic property is practically observed for all self-activated ABO 3 perovskites titanates [4]. The origin of green luminescence has been explained and discussed in many papers by different mechanisms, including self-trapped excitons [5], recombination of electron and hole polarons, charge transfer vibronic exciton [6], donor-acceptor recombination [7], transitions in MeO 6 complexes [8] and structurally disordered titanates [9][10][11]. However, few investigations on this phenomenon in zirconates have been reported [12][13][14][15][16].…”

Density functional theory calculation of the electronic structure ofBa0.5Sr0.5TiOLongo1, Orhan2, Pontes3 et al. 2004Phys. Rev. BSelf Cite1045510View full textAdd to dashboardCite

“…[1][2][3] We have reported several interesting properties of these amorphous titanates, including the fact that the PL emission wavelength depends on the exciting wavelength, suggesting electronic transitions between a distribution of vibronic states 4 and that the PL phenomena are related to the amorphous state. 2,5 These studies revealed important aspects.…”