Intrinsic defect related luminescence in ZrO2

Šmits, Krišjānis; Grigorjeva, L.; Millers, D.; Šarakovskis, Anatolijs; Grabis, Jānis; Łojkowski, Witold

doi:10.1016/j.jlumin.2011.05.018

Cited by 112 publications

(84 citation statements)

References 25 publications

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“…This means that they consist of several overlapping components that is typical for pure and Y-doped ZrO 2 materials. 8,17,25 and the references therein On the other hand, this variation implies that besides the common intense excitation at ∼280 nm, PL bands possess the individual excitation features. Unfortunately, these latter cannot be clearly separated due to significant overlapping of PL bands.…”

Section: Structuralmentioning

confidence: 99%

“…[6][7][8][21][22][23][24][25] This PL emission originates from defect states caused by the different structural defects [6][7][8]22 that can explain a variety of observed PL bands. These latter are attributed usually to intrinsic defects such as oxygen vacancies 26 or their complexes located in the crystal volume, 6,27 at grain surface 7 or near impurities.…”

mentioning

confidence: 99%

“…These latter are attributed usually to intrinsic defects such as oxygen vacancies 26 or their complexes located in the crystal volume, 6,27 at grain surface 7 or near impurities. 6 In addition, T-defect (Zr 3+ neighboring with two oxygen vacancies located in the crystal volume 28,29 ) or unsaturated Zr sites at the crystal surface (surface Zr 3+ centers 30 ) as well as the lattice distortion by oxygen vacancies 8 were considered as PL sources. The shift of PL peak position with the variation of the excitation light wavelength 6,8,17 is obviously caused by the overlapping of different PL bands.…”

mentioning

confidence: 99%

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Structural and Luminescent Properties of (Y,Cu)-Codoped Zirconia Nanopowders

Korsunska

Baran

Polishchuk

et al. 2015

ECS J. Solid State Sci. Technol.

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The effect of both CuO content (1 and 8 mol%) and calcination temperature (T c = 500-1000 • C) on light emitting and structural properties of ZrO 2 -Y 2 O 3 -CuO nanopowders was studied by photoluminescence (PL), X-ray diffraction (XRD) and Raman scattering methods. The samples, calcinated at T c = 500-700 • C, contain the tetragonal ZrO 2 phase predominantly. The increase of T c results in its transformation to monoclinic one, and the phase transformation happens at higher temperature at higher Cu content. It is shown that the increase of T c from 500 to 800 • C results in the Cu incorporation into nanocrystals from the surface entities. This manifests itself in the shift of XRD and Raman peaks of tetragonal phase. The PL spectra demonstrate the presence of two main PL components peaked at about 540 nm and 630 nm in the most samples. The increase of T c from 500 to 1000 • C results in the non-monotonic variation of total PL intensity as well as in minor changes in PL spectra shape. The evolution of PL intensity is explained by both the increase of a crystallinity degree and the variation of the concentration of non-radiative recombination centres. The transformation of PL spectra shape is ascribed to the appearance of radiative Cu Zr centres.

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Section: Structuralmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Structural and Luminescent Properties of (Y,Cu)-Codoped Zirconia Nanopowders

Korsunska

Baran

Polishchuk

et al. 2015

ECS J. Solid State Sci. Technol.

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“…The band placed at 620 nm was also observed in 33 , where appeared after annealing under mixture of gases containing 2% of oxygen and was associated with the creation of oxygen vacancies. Considering that we observe this band in both the microwave hydrothermal and calcination only prepared powders, even after annealing, we conclude, that 620 nm emission has the intrinsic character and is related to the existence of defects in oxygen sublattice.…”

Section: Luminescencementioning

confidence: 80%

High Pressure Synthesis versus Calcination – Different Approaches to Crystallization of Zirconium Dioxide

Kaszewski

Yatsunenko

Pełech

et al. 2014

Polish Journal of Chemical Technology

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Calcination and microwave-assisted hydrothermal processing of precipitated zirconium dioxide are compared. Characterization of synthesized products of these two technologies is presented. The infl uence of thermal treatment up to 1200 o C on the structural and spectroscopic properties of the so-obtained zirconium dioxide is examined. It was found that initial crystallization of material inhibits the crystal growth up to the 800 o C (by means of XRD and TEM techniques), while the material crystallized from amorphous hydroxide precursor at 400 o C, exhibits 26 nm sized crystallites already. It was found using the TG technique that the temperature range 100-200 o C during the calcination process is equivalent to a microwave hydrothermal process by means of water content. Mass loss is estimated to be about 18%. Based on X-ray investigations it was found that the initial hydroxide precursor is amorphous, however, its luminescence activity suggests the close range ordering in a material.

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“…In order to reach this goal, we combine the results of experimental luminescent spectroscopy and theoretical calculations. It is known that the visible luminescence in undoped oxide materials is usually caused by uncontrolled impurities [6] or defect-related centres (e.g., F, F + or F 2 + centres) [7][8][9]. Here we study the impact of oxygen vacancies on the luminescence properties of ZrP 2 O 7 crystals.…”

Section: Introductionmentioning

confidence: 97%

Electronic band structure and luminescence properties of powdered ZrP2O7 crystals

Nedilko¹,

Chornii²

2013

Ukr. J. Phys. Opt.

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Abstract. Ultraviolet and visible photoluminescence properties of ZrP 2 O 7 crystals are studied under excitation in the region 3.5÷12 eV of incident photon energies. Partial densities of electronic states are calculated with a full-potential linear augmented plane-wave method for both perfect crystals and those containing two types of oxygen vacancies. The UV luminescence is considered as a radiation decay of trapped excitons formed on the basis of [ZrO 6 ] 8-polyhedrons. Generation of the excitons is mainly related to charge-transfer electronic transitions between the electronic states Op and Zrd. The visible luminescence and its excitation are associated with processes that occur in polyhedrons containing the oxygen vacancies.

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Intrinsic defect related luminescence in ZrO2

Cited by 112 publications

References 25 publications

Structural and Luminescent Properties of (Y,Cu)-Codoped Zirconia Nanopowders

Structural and Luminescent Properties of (Y,Cu)-Codoped Zirconia Nanopowders

High Pressure Synthesis versus Calcination – Different Approaches to Crystallization of Zirconium Dioxide

Electronic band structure and luminescence properties of powdered ZrP2O7 crystals

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