Luminescence processes in (AII=Ba, Sr) layered perovskites

Chukova, O.; Gomenyuk, O.; Nedilko, S.; Polubinskii, Vitaliy; Scherbatsky, V.P.; Sheludko, V.; Titov, Yu. A.

doi:10.1016/j.optmat.2014.02.001

Cited by 8 publications

(10 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The buffer NH 3 • H 2 О+ (NH 4 ) 2 CO 3 aqueous solution of pH ≈ 8.5 was used as precipitator. The shock heating thermal treatments were carried out for 2 h at 1120 K for Sr 3 LaNb 3 O 12 and at 1570 K for all the others compositions [27,28].…”

Section: Methodsmentioning

confidence: 99%

“…Luminescence mechanisms were supposed to be of the exciton nature, but features of it are still under discussion. The main point of view is the recombination of self-trapped excitons on octahedral groups [18] and emission of the charge transfer vibronic excitons [27]. Strongly distorted corner-sharing octahedral groups are usually characterized by stronger luminescence.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Crystallographic Features and Nature of Luminescence Centres of the Niobate and Tantalate Compounds with Layered Perovskite-Like Structure

Chukova¹,

Nedilko²,

Titov³

et al. 2018

TOMSJ

Self Cite

View full text Add to dashboard Cite

Aim and Objectives The ultrafine powders of the perovskite-like layered AII3LaM3O12 (AII = Sr, Ba; M = Nb, Ta) compounds have been synthesized by heat treatment of co-precipitated hydroxy-carbonates. The luminescence of these compounds is reported for the first time. Methods: Luminescence spectra of all studied compounds are complex and contain two main wide bands with maxima near 2.9 and 2.5 eV. These luminescence bands were assigned to radiation electron transitions in the MoO67- molecular groups of different symmetry located in the various lattice positions. Conclusion: The energy levels scheme of the MoO67- group and related radiation and absorption transitions had been proposed.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Crystallographic Features and Nature of Luminescence Centres of the Niobate and Tantalate Compounds with Layered Perovskite-Like Structure

Chukova¹,

Nedilko²,

Titov³

et al. 2018

TOMSJ

Self Cite

View full text Add to dashboard Cite

show abstract

“…The simple structure of the Eu 1− x Сa x VO 4 emission spectra that was observed for the most of applied excitations (Figure ) is characteristic for emission of the Eu 3+ ions having high symmetry of the nearest crystal surrounding and it should be assigned to emission of the Eu 3+ ions in their regular positions in the EuVO 4 crystal lattice (D 2d symmetry). The group theory predicts for emission of the Eu 3+ ions in this symmetry no luminescence peaks from 5 D 0 → 7 F 0 transition, two lines from the 5 D 0 → 7 F 1 and three lines from the 5 D 0 → 7 F 2 transitions . There are lines at 593, 595 nm ( 5 D 0 → 7 F 1 ) and 608, 614, 618 nm ( 5 D 0 → 7 F 2 ) observed by us.…”

Section: Luminescent Propertiesmentioning

confidence: 47%

“…The 380–425 and 460–480 nm bands correspond to range of the 5 F 0 → 7 D 3 and 5 F 0 → 7 D 2 excitation transitions in the Eu 3+ ions, respectively . The 320 nm band in vanadate compounds is usually connected with 1 A 1 → 1 T 2 transitions in the VO 4 3‐ anions .…”

Section: Luminescent Propertiesmentioning

confidence: 99%

Synthesis and Investigation of La,Ca ‐Doped EuVO₄ Nanoparticles with Enhanced Excitation by Near Violet Light

Chukova

Nedilko

Slepets

et al. 2018

Physica Status Solidi (a)

View full text Add to dashboard Cite

The paper reports experimental results on features of crystal structure and luminescent properties of the Eu1−xCayVO4 nanoparticles synthesized for the first time. The Eu1−xCaxVO4 compounds with x = 0, 0.05, 0.1, 0.15, and 0.20 are prepared by aqueous nitrate–citrate sol–gel synthesis. The obtained samples are characterized by XRD analysis. The Eu1−xCaxVO4 samples are crystallized in tetragonal structure. Phase composition of the sample depends on the x value. Increasing concentrations of the calcium ions leads to formation of the EuVO4 and CaV2O6 phases’ mixture. Luminescence properties of the synthesized Eu1−xCaxVO4 nanoparticles are considered in comparison with properties of the La1−x−yEuyCaxVO4 nanoparticles. Formation of two types of emission centers and arising of additional excitation band near 400 nm are observed for the both compositions. It is shown that second types of the emission centers have different structure and spectral characteristics for the Eu1−xCaxVO4 and La1−x−yEuyCaxVO4 nanoparticles, whereas the 400 nm excitation band has the same origin for the both compositions.

show abstract

“…Luminescent measurements under UV excitation were carried out using synchrotron radiation at SUPERLUMI station at HASYLAB, Hamburg, Germany as it was described in [25,26]. Excitation spectra of the IR luminescence were measured at R&D Laboratory "Spectroscopy of condensed state of matter" (Physics Faculty of the Taras Shevchenko National University of Kyiv) using radiation of power xenon lamp [27].…”

Section: Methodsmentioning

confidence: 99%

Luminescent Spectroscopy of the Yb³⁺Ions in the PbWO₄Crystal

Chukova

Nedilko

2018

Acta Phys. Pol. A

View full text Add to dashboard Cite

Luminescent properties of the PbWO4 crystals undoped and doped with the Yb 3+ ions were studied. Emission spectra of the crystals consist of broadband matrix emission in 350-750 nm spectral range and narrow spectral lines caused by inner electron transitions in the impurity Yb 3+ ions in 920-1040 nm spectral range. Analysis of the linear spectra has shown that Yb 3+ ions form two types of emission centres. Structures of these centers are discussed taking into account possibility of the impurity ions incorporation in different positions (Pb and W sites) in the crystal lattice. Effects of the Yb 3+ impurities on matrix emission were studied. Transfer of excitation energy from matrix to the Yb 3+ decreases intensity of the red band of matrix emission. The Yb 3+ impurities also increase intensity of the blue band by formation of additional Yb 3+-induced channel of excitation of this band. The described effects of Yb 3+ doping on properties of matrix emission are caused by the Yb 3+ ions arranged in Pb positions.

show abstract

Luminescence processes in (AII=Ba, Sr) layered perovskites

Cited by 8 publications

References 14 publications

Crystallographic Features and Nature of Luminescence Centres of the Niobate and Tantalate Compounds with Layered Perovskite-Like Structure

Crystallographic Features and Nature of Luminescence Centres of the Niobate and Tantalate Compounds with Layered Perovskite-Like Structure

Synthesis and Investigation of La,Ca ‐Doped EuVO₄ Nanoparticles with Enhanced Excitation by Near Violet Light

Luminescent Spectroscopy of the Yb³⁺Ions in the PbWO₄Crystal

Contact Info

Product

Resources

About

Luminescence processes in (AII=Ba, Sr) layered perovskites

Cited by 8 publications

References 14 publications

Crystallographic Features and Nature of Luminescence Centres of the Niobate and Tantalate Compounds with Layered Perovskite-Like Structure

Crystallographic Features and Nature of Luminescence Centres of the Niobate and Tantalate Compounds with Layered Perovskite-Like Structure

Synthesis and Investigation of La,Ca ‐Doped EuVO4 Nanoparticles with Enhanced Excitation by Near Violet Light

Luminescent Spectroscopy of the Yb3+Ions in the PbWO4Crystal

Contact Info

Product

Resources

About

Synthesis and Investigation of La,Ca ‐Doped EuVO₄ Nanoparticles with Enhanced Excitation by Near Violet Light

Luminescent Spectroscopy of the Yb³⁺Ions in the PbWO₄Crystal