Luminescence properties of Eu3+- and Mg2+-doped LiTaO3 obtained via the polymeric precursor method

Correlation between the spectroscopic and structural properties with the occupation of Eu3+ sites in powdered Eu3+-doped LiTaO3 prepared by the Pechini method

“…Figure 1 shows some diffraction patterns of the pure LiTaO 3 and Eu-doped LiTaO 3 , just as presented by the group in a recent published article. 13 The quantitative analysis of the phases based on the Rietveld method indicates a percentage of 1.1͑1͒ wt % of Ta 2 O 5 phase, which tells us that LiTaO 3 is present in 98.8͑1͒ wt %. All the doped samples form a 100% LiTaO 3 phase, and this leads us to conclude that the presence of the Eu 3+ ions reduces the temperature for the formation of the LiTaO 3 phase.…”

“…We ascribed the 0-0 band at 581 nm to a Eu 3+ ion occupying a Li + site, while the set of 0-0 bands around 584 nm was ascribed to a Eu 3+ ion at a Ta 5+ site. 13 Due to the proximity of the two bands centered at 584 nm, that is, a small ⌬ ͑ϳ0.30 nm͒ between 584 nm bands as compared to the ⌬ ͑ϳ3.0 nm͒ between the two sets of 0-0 bands ͑581/ 584 nm͒, both were ascribed to a Eu 3+ at a Ta 5+ site. The 584 nm bands were named A and B, respectively.…”

“…The powdered Li 1+2x Ta 1−x Eu x O 3 were prepared via the polymeric precursor method, 14 with x = 0.0010-0.0100, similar to that described by Gasparotto et al 13 The x-ray diffraction data ͑XRD͒ were collected using a RIGAKU® RINT2000 rotating anode diffractometer with Cu K␣ radiation monochromatized by a curved graphite crystal, the interval lying between 20°and 100°͑2 ͒, 0.02°͑ 2 ͒ time per point of 0.3 s. The Rietveld refinement 15 was carried out using a GSAS ͑Ref. 16͒ suite with an EXPGUI ͑Ref.…”

“…However, in the case of LiNbO 3 :Eu 3+ , when its spectroscopic properties, i.e., spectral profile, are compared to the results of the channeling techniques, efforts to locate the crystallographic lattice site becomes largely ambiguous. 1 Muñoz Santiuste et al 10 13 we did analyze the spectroscopy properties of LiTaO 3 :Eu 3+ powder prepared by the Pechini method. 14 It was observed at least three Eu 3+ sites without a center of symmetry, but no comments were advanced as to the nature of the sites as well as the relative amount of Eu 3+ in each site.…”

Nanostructured LiTaO3 and KNbO3 Ferroelectric Transparent Glass-Ceramics for Applications in Optoelectronics

“…Luminescence properties of Ho 3+ , Eu 3+ , Tb 3+ etc. doped LiTaO 3 crystals, an another important area of exploration, which have also been investigated by various researchers (Sokólska, 2002, Sokólska et al, 2001, Gasparotto et al, 2008, Gruber et. al., 2006.…”