Role of intrinsic defects and impurities in forming the optical characteristics of ZnWO4 and CdWO4 crystals

Limarenko, L. N.; Zorenko, Yuriy; Batenchuk, M. M.; Moroz, Z. T.; Pashkovskiǐ, M. V.; Konstankevich, I. V.

doi:10.1007/bf02681848

Cited by 10 publications

(15 citation statements)

References 6 publications

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“…In NiWO 4 , the same photoluminescence band has irregular asymmetric shape, which is close to that observed previously in solid solutions Zn c Ni 1-c WO 4 [32]. The origin of such band shape can be attributed [32] to the self-absorption effect, i.e., to a modulation of optical absorption by the intense intra-ion transition within Ni 2+ (3d 8 ) ions from the ground state 3 A 2g to the excited state 3 T 1 [44]. The maximum of the photoluminescence band in nanoNiWO 4 is located at 2.7 eV, thus being shifted by ~0.32 eV to higher energy compared to nano-ZnWO 4 [45].…”

Section: Photoluminescence Spectrasupporting

confidence: 85%

UV-VUV synchrotron radiation spectroscopy of NiWO4

Kuzmin

Pankratov

Kalinko

et al. 2016

Low Temperature Physics

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Photoluminescence and excitation spectra of microcrystalline and nanocrystalline nickel tungstate (NiWO 4 ) were measured using UV-VUV synchrotron radiation source. The origin of the bands is interpreted using comparative analysis with isostructural ZnWO 4 tungstate and based on the results of recent first-principles band structure calculations. The influence of the local atomic structure relaxation and of Ni 2+ intra-ion d-d transitions on the photoluminescence band intensity are discussed.

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Section: Photoluminescence Spectrasupporting

confidence: 85%

UV-VUV synchrotron radiation spectroscopy of NiWO4

Kuzmin

Pankratov

Kalinko

et al. 2016

Low Temperature Physics

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“…The origin of the last band at 3.0 eV appearing in the solid solutions is attributed to the interference between the broad luminescence band of the WO 6 groups and the absorption band of the NiO 6 groups. The self-absorption effect is caused by the intensive transition at ∼ 2 72 eV from the ground state 3 A 2g to the excited state 3 T 1 of Ni 2+ (3d 8 ) ions [10,25] in distorted octahedral coordination [23].…”

Section: Resultsmentioning

confidence: 99%

Electronic excitations in ZnWO4 and ZnxNi1−x WO4 (x = 0.1 − 0.9) using VUV synchrotron radiation

et al. 2011

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Abstract:The photoluminescence spectra and luminescence excitation spectra of pure microcrystalline and nano-sized ZnWO 4 as well as the Zn Ni 1− WO 4 solid solutions were studied using vacuum ultraviolet (VUV) synchrotron radiation. The samples were also characterized by x-ray powder diffraction. We found that: (i) the shape of the photoluminescence band at 2.5 eV, being due to radiative electron transitions within the [WO 6 ] 6− anions, becomes modulated by the optical absorption of Ni 2+ ions in the Zn Ni 1− WO 4 solid solutions; and (ii) no significant change in the excitation spectra of Zn 0 9 Ni 0 1 WO 4 is observed compared to pure ZnWO 4 . At the same time, a shift of the excitonic bands to smaller energies and a set of peaks, attributed to the one-electron transitions from the top of the valence band to quasi-localized states, were observed in the excitation spectrum of nano-sized ZnWO 4 .PACS (2008)

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“…This effect is probably related to the increase of concentration of oxygen vacancies that are needed for compensation of the Na + ions charge in lattice. It has been shown already that doping with Na + ions causes also an increase of concentration of iron background impurities in state Fe 3+ [14].…”

Section: Article In Pressmentioning

confidence: 96%