Investigation of crystallographic sites of Eu3+ in La2BaZnO5 by site-selective laser-excitation spectroscopy

The emission-tunable CaLa 2-x Eu x ZnO 5 phosphors were synthesized by citric sol-gel method. The products were characterized by X-ray diffractometer, scanning electron microscope, energy dispersive spectroscopy and photoluminescence spectrometer. Through adjusting the dopant concentration of Eu 3? in CaLa 2 ZnO 5 phosphor, blue-green to orange-red emission with the 467 nm excitation could be obtained, which matches well with the emission of blue LED chip. Luminescence properties of Ca 1-y Sr y La 1.9 Eu 0.1 ZnO 5 (0 B y B 1) indicated that increasing Sr 2? content enhances not only the emission intensity of 5 D 0 ? 7 F 2 transition but also the emission intensity ratio of 5 D 0 ? 7 F 2 to 5 D 0 ? 7 F 1 (asymmetry ratio). The Ca 0.6 Sr 0.4 La 1.9 Eu 0.1 ZnO 5 phosphors possess optimal integrated emission intensity, which is 20 % higher than that of CaLa 1.9 Eu 0.1 ZnO 5 phosphors, and the Commission International de L'Eclairage chromaticity coordinate is (0.658, 0.341). Ca 1-y Sr y La 2-x Eu x ZnO 5 phosphors may have potential applications in field emission displays based on their particle size, low-cost synthetic route, and diverse luminescent properties.

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“…The red-emitting Eu 3? doped BaLa 2 ZnO 5 is reported to show the quantum efficiency of about 75 % [15].…”

Section: Introductionmentioning

confidence: 99%

Citric sol–gel synthesis and luminescence characteristics of Ca1−y Sr y La2−x Eu x ZnO5 phosphors

Liu

Lü

et al. 2015

J Mater Sci: Mater Electron

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“…For example, recent studies of La 2 − x Eu x BaZnO 5 , utilizing Eu 3+ luminescence spectroscopy, have found that the substituent Eu 3+ ion is distributed at both the 10-fold Ba-site and 8-fold lanthanide-site [19]. From our PXRD analyses we are unable to reliably determine the preferred site for the Ca ion.…”

Section: Crystal Structurementioning

confidence: 61%

“…Here we report on the electronic conductivity of acceptor doped La 2 BaZnO 5 and Nd 2 BaZnO 5 . The synthesis and structure determination of these phases was first reported by Michel et al [17] and the materials have attracted attention through their use as red-emitting phosphors when suitably doped [18,19]. The tetragonal crystal structure contains layers of discreet, ZnO 4 tetrahedral motifs, suggesting the materials may be good candidates for high ionic (oxide or protonic) conductivity.…”

Section: Introductionmentioning

confidence: 99%

Structure and conductivity of acceptor doped La2BaZnO5 and Nd2BaZnO5

2015

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“…However, in the BaRB 9 O 16 lattice, the M 3+ ions occupy either R 1 and R 2 or Ba 2+ sites, while no substitution of M 3+ takes place for the Ba 2+ site in the BaR 2 ZnO 5 lattice. 26,27 The preferential sites seems to be in relation with the structural characteristics which will be discussed elsewhere. We note that the Eu 3+ ions substitute for three different sites of Y1, Y2, and Ba in the BaY 2 O 4 lattice.…”

Section: Discussionmentioning

confidence: 91%

“…We suggest that the Eu(A) ions with the highest energy of the 5 D 0 state correspond to Eu 3+ at the Ba 2+ site with charge-compensated site-symmetry and the strongest crystal-field strength by the distortion of the lattice. According to Shi et al 27 the Eu 3+ ions substitute for the La 3+ and Ba 2+ sites in tetragonal La 2 BaZnO 5 in which the Ba 2+ site for Eu 3+ is strongly distorted by charge compensation. Thus the Ba 2+ site has lower crystal-field symmetry with stronger crystal-field strength than the trivalent La 3+ site in La 2 BaZnO 5 .…”

Section: Discussionmentioning

confidence: 99%

Site-Occupation and Crystal-Field Splitting of Eu3+ in BaY2O4 with Calcium-Ferrite Structure

Shi¹,

Seo²

2011

J. Electrochem. Soc.

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Luminescence properties of BaY 2 O 4 :Eu 3+ are investigated by the site-selective laser-excitation spectroscopy in the temperature region 15-300 K. The phosphors were synthesized by the Pechini-type sol-gel method for different Eu 3+ -concentrations. Three different crystallographic sites corresponding to two Y 3+ sites (Y1 and Y2) and the Ba site for Eu 3+ are identified from the excitation spectra due to the 7 F 0 → 5 D 0 transition. Crystal-field splittings of the 7 F 1 and 7 F 2 multiplets lead to classify three different sites for Eu 3+ in BaY 2 O 4 lattice. Luminescence decays and spectral features at each site depend strongly on temperature and Eu 3+ -concentration in BaY 2 O 4 :Eu 3+ .

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Investigation of crystallographic sites of Eu3+ in La2BaZnO5 by site-selective laser-excitation spectroscopy

Cited by 12 publications

References 5 publications

Citric sol–gel synthesis and luminescence characteristics of Ca1−y Sr y La2−x Eu x ZnO5 phosphors

Citric sol–gel synthesis and luminescence characteristics of Ca1−y Sr y La2−x Eu x ZnO5 phosphors

Structure and conductivity of acceptor doped La2BaZnO5 and Nd2BaZnO5

Site-Occupation and Crystal-Field Splitting of Eu3+ in BaY2O4 with Calcium-Ferrite Structure

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