Energy transfer in ZnWO4 and CdWO4 scintillators

Nagirnyi, V.; Feldbach, E.; Jönsson, L.; Kirm, M.; Kotlov, A.; Lushchik, A.; Nefedov, V. A.; Zadneprovski, B.I.

doi:10.1016/s0168-9002(02)00740-4

Cited by 81 publications

(45 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…1). The origin of the band has been previously assigned to radiative electron transitions within the [WO 6 ] 6-molecular complex [42,43]. 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].…”

Section: Photoluminescence Spectrasupporting

confidence: 84%

See 1 more Smart Citation

UV-VUV synchrotron radiation spectroscopy of NiWO4

Kuzmin

Pankratov

Kalinko

et al. 2016

Low Temperature Physics

View full text Add to dashboard Cite

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.

show abstract

Section: Photoluminescence Spectrasupporting

confidence: 84%

“…Similar to the case of ZnWO 4 [42,43], the photoluminescence spectra of both microcrystalline and nanocrystalline NiWO 4 powders originate in the [WO 6 ] 6-molecular complex. However, their intensity is strongly modulated by the optical absorption of Ni 2+ ions (intra-ion d-d transitions).…”

Section: Discussionmentioning

confidence: 69%

UV-VUV synchrotron radiation spectroscopy of NiWO4

Kuzmin

Pankratov

Kalinko

et al. 2016

Low Temperature Physics

View full text Add to dashboard Cite

show abstract

“…The luminescence band at 2.55 eV in microcrystalline ZnWO 4 has a complex shape being similar to that in [31]: it envelops three emission bands, namely yellow at 2.28 eV, green at 2.51 eV, and blue at 2.80 eV [21]. The green-blue luminescence is believed to be due to radiation transitions of the charge transfer type between oxygen and tungstate states in regular octahedral WO 6 groups [2,32,33,34], while yellow luminescence was tentatively attribute to defective tungsten groups lacking one oxygen atom G(R) (atoms / Å) R (Å) Figure 5: The reconstructed RDFs G(R) for the first coordination shell of tungsten and zinc in nanoparticles and microcrystalline ZnWO 4 at representative temperatures. See text for details.…”

Section: Resultsmentioning

confidence: 94%

Static and dynamic structure of ZnWO4 nanoparticles

Kalinko

Kuzmin

2011

Journal of Non-Crystalline Solids

View full text Add to dashboard Cite

Static and dynamic structure of ZnWO 4 nanoparticles, synthesized by co-precipitation technique, has been studied by temperature dependent x-ray absorption spectroscopy at the Zn K-edge and W L 3 -edge. The complementary experimental techniques, such as x-ray powder diffraction, Raman and photoluminescence spectroscopies, have been used to understand the variation of vibrational, optical, and structural properties of nanoparticles, compared to microcrystalline ZnWO 4 . Our results indicate that the structure of nanoparticles experiences strong relaxation leading to the significant distortions of the WO 6 and ZnO 6 octahedra, being responsible for the changes in optical and vibrational properties.

show abstract

“…Furthermore, as the unoccupied Cd 5s state is expected to be located in the lower energy part of the Mo 4d or W 5d conduction band when compared with Ca compounds, one expects a noticeable contribution of the metal state to the optical properties of Cd compounds. The reflection spectrum of CdWO 4 has been measured earlier by Kolobanov et al 19 and Nagirnyi et al, 20,21 and that of CdMoO 4 has been measured recently by Mikhailik et al 22 No optical constants, however, have been derived from these data.…”

Section: Introductionmentioning

confidence: 93%

Optical anisotropy and electronic structures ofCdMoO4andCdW
Fujita
¹
,
Itoh
²
,
Katagiri
³

et al. 2008
Phys. Rev. B

View full text Add to dashboard Cite

The polarized reflectivity spectra of CdMoO 4 single crystals with a scheelite structure and of CdWO 4 with a wolframite structure are measured in the 3 -30 eV range by using synchrotron radiation. The spectra of optical constants for the crystallographic axes are derived by a Kramers-Kronig analysis. X-ray photoelectron spectroscopy ͑XPS͒ and the calculation of the electronic structure by using a discrete variational X␣ method are performed for CdMoO 4 . The calculation shows that the Cd 4d state is localized at the bottom region of the O 2p valence band, and the Cd 5s state has a significant contribution to the bottom of the conduction band, composed of the Mo 4d state. The XPS spectrum of CdMoO 4 resembles that of CdWO 4 . Unlike the XPS spectrum, the optical spectra of CdMoO 4 resemble those of scheelite CaMoO 4 rather than CdWO 4 . An excitonic transition is observed as a weak shoulderlike structure in CdWO 4 , while it is not appreciable in CdMoO 4 . These experimental results are discussed in comparison with the theoretical calculation of electronic structures. The remarkable anisotropy of the optical spectra in CdMoO 4 is explained by taking into account the presence of the Cd 5s state at the bottom of the conduction band. The dichroism of CdWO 4 is discussed in terms of the chain structure of WO 6 6− octahedra in wolframite crystals. The present study indicates that the Cd metal states play a crucial role in the optical properties near the fundamental absorption edge in both CdMoO 4 and CdWO 4 .

show abstract

Energy transfer in ZnWO4 and CdWO4 scintillators

Cited by 81 publications

References 12 publications

UV-VUV synchrotron radiation spectroscopy of NiWO4

UV-VUV synchrotron radiation spectroscopy of NiWO4

Static and dynamic structure of ZnWO4 nanoparticles

Optical anisotropy and electronic structures ofCdMoO4andCdW
Fujita
¹
,
Itoh
²
,
Katagiri
³

et al. 2008
Phys. Rev. B

Contact Info

Product

Resources

About

Energy transfer in ZnWO4 and CdWO4 scintillators

Cited by 81 publications

References 12 publications

UV-VUV synchrotron radiation spectroscopy of NiWO4

UV-VUV synchrotron radiation spectroscopy of NiWO4

Static and dynamic structure of ZnWO4 nanoparticles

Optical anisotropy and electronic structures ofCdMoO4andCdWFujita1, Itoh2, Katagiri3 et al. 2008Phys. Rev. B

Contact Info

Product

Resources

About

Optical anisotropy and electronic structures ofCdMoO4andCdW
Fujita
¹
,
Itoh
²
,
Katagiri
³

et al. 2008
Phys. Rev. B