Enhancement of luminescence and afterglow in CaTiO3:Pr3+ by Zr substitution for Ti

Blue excited photoluminescence of Pr doped CaBi2Ta2O9 based ferroelectrics

“…The reasons for the enhancement of the PL intensity can be ascribe to the change of the lattice symmetry. The change of the lattice symmetry will give rise to a remarkable effect on the properties of Pr 3+ and further influence the luminescence properties [31][32][33][34], when Ca 2+ (1.34Å, 12 CN) ions are replaced by bigger radius Sr 2+ ions (1.44Å, 12 CN), the symmetry of the pseudoperovskite units was changed [33]. As previously discussed Pr 3+ ions dispersed in the pseudo-perovskite units of samples' crystal structure.…”

“…The local environments of Pr 3+ become more asymmetric. This change of lattice symmetry allows stronger 4f-4f emission to occur [33,34]. There are still other reasons which might influence the emission properties, such as crystallinity, particle size, defects.…”

Europium-doped calcium titanate: Optical and structural evaluations

“…8 [48,49]. The profile of the curves clearly indicate that two processes govern the luminescence and this is a sign that the Eu 3+ ions occupy at least two different sites of symmetry in the CT matrix (see Fig.…”

CaTiO3:Eu3+, a potential red long lasting phosphor: Energy migration and characterization of trap level distribution

“…Zhang et al [38] reported that the afterglow of CaTiO 3 :Pr 3+ with 1mol% Zr addition was seen over 100 s with the naked eyes, while the Zr free sample can only have a persistent time of 30 s for the red afterglow after the irradiation with an ultraviolet lamp. The results clearly showed that the phosphorescence lifetime was increased by Zr substitution for Ti.…”