Photoluminescence behavior in MgTiO3 powders with vacancy/distorted clusters and octahedral tilting

Effect of annealing and atmosphere on the structure and optical properties of Mg2TiO4thin films obtained by the radio frequency magnetron sputtering method

“…PL results compliment the optical bandgap values that the increase in O 2 SCCM results the highest intensity of the peaks, which can be attributed to the high degree of structural order and disorder in to the lattice [21]. From the bandgap calculations, it is observed that for as-deposited and annealed films bandgap decreases with O 2 SCCM.…”

“…As observed from transmittance spectra, the highest intensity film exhibited the lowest bandgap. The increase in intensities from PL spectrum and decrease in bandgap can be attributed to the increase of intermediary energy levels within the bandgap due to the defects in clusters of crystalline structure [21].…”

Photoluminescence in Low-Dimensional Oxide Ferroelectric Materials

“…The PL behavior is probably due the existence of a charge gradient on the disordered structure, denoted by means of a charge transfer process from [TiO 5 ]- [ZrO 6 ] or [TiO 6 ]-[ZrO 5 ] clusters to [TiO 6 ]-[ZrO 6 ] clusters. Similar photoluminescence behavior was also observed in disordered MgTiO 3 and Mndoped BaTiO 3 powders [21,22]. The experimental and theoretical results indicated that PL is related with the degree of disorder in the powders and also suggests the presence of localized states in the disordered structure.…”

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

“…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.…”

“…In particular, titanium-based perovskite oxides with formula ATiO 3 (A ¼ Pb, Sr, Ba, Zn, Ni, or Fe) presents outstanding potential in electronics [3], gas sensors [4], catalysis [5], memory devices [6], magnetic material [7], and so on. Moreover, the photoluminescence (PL) properties were observed in perovskite-type titanates, such as: (Ba,Ca)TiO 3 [8], Pb(Zr,Ti)O 3 [9], SrTiO 3 [10], and MgTiO 3 [11]. These compounds present broad and intense PL emission at room temperature that can provide the comprehension of energetic levels, defects formation, surface states, which are intrinsically related to its optical response.…”