Excitonic and recombination processes in CaWO4 and CdWO4 scintillators under synchrotron irradiation

Nagirnyi, V.; Feldbach, E.; Jönsson, L.; Kirm, M.; Lushchik, A.; Lushchik, Ch.; Nagornaya, L.L.; Ryzhikov, V. D.; Savikhin, F.; Svensson, Gunnar; Tupitsina, I.A.

doi:10.1016/s1350-4487(98)00017-1

Cited by 82 publications

(35 citation statements)

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“…The former result is compatible with our interpretation that the lowest broad band 1 originates from the JDOS rather than the exciton transition. For the latter, we notice the paper by Nagirnyi et al [27]. They pointed out that the excitation thresholds of TL in CdWO 4 , MgWO 4 , and CaWO 4 coincide with the energies of the interband transitions in the corresponding metal oxides (CdO, MgO and CaO).…”

Section: Original Papermentioning

confidence: 70%

“…They pointed out that the excitation thresholds of TL in CdWO 4 , MgWO 4 , and CaWO 4 coincide with the energies of the interband transitions in the corresponding metal oxides (CdO, MgO and CaO). From such coincidences, it was claimed that free carriers responsible for TL are created by the photo-excitation to the metal states in these tungstates [27,28]. When an electron is excited to the 5d state of W ions composing a WO 4 2-molecule, it will quickly recombine with a hole on the O site before migrating to trap centers and cannot contribute to TL.…”

Section: Original Papermentioning

confidence: 99%

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Comparative study of optical spectra and electronic structures of CaMoO₄ and CaWO₄ crystals

Fujita

Itoh

Takagi

et al. 2006

Physica Status Solidi (b)

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Polarized reflectivity spectra of CaMoO 4 and CaWO 4 single crystals have been measured up to 30 eV by using synchrotron radiation as a light source. The optical constants for a-and c-axes are derived from the reflectivity spectra by a Kramers -Kronig analysis. A clear correspondence is found in the main structures of the optical spectra between molybdate and tungstate. It is revealed that the lowest bands peaking at 5.0 eV in CaMoO 4 and at 6.0 eV in CaWO 4 consisit of some fine structures with distinct dichroism. They are attributed to the joint density-of-states; in other words, no structures indicative of exciton transition are found at the fundamental absorption edge. From the comparison of the spectral profiles in CaMoO 4 and CaWO 4 , the structures below 10 eV are ascribed to the transitions from the O 2p valence band to the conduction band mainly made of Mo 4d (W 5d) states, while those above 10 eV are assigned to the transitions to the Ca conduction band. The polarization dependence of the structures below 10 eV is explained well in terms of the intramolecular transition in an oxyanion complex in the scheelite crystal. The energy band structure of CaWO 4 is discussed taking into account of the previous results such as the thermostimulated luminescence and the two-photon excitation.

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Section: Original Papermentioning

confidence: 70%

Section: Original Papermentioning

confidence: 99%

Comparative study of optical spectra and electronic structures of CaMoO₄ and CaWO₄ crystals

Fujita

Itoh

Takagi

et al. 2006

Physica Status Solidi (b)

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“…Whereas the forbidden gap in CWO was estimated to be > 5.2 eV [5], the fundamental absorption edge tail due to oxygen deficient states or exciton states was observed at lower . energies (Fig.…”

Section: Resultsmentioning

confidence: 96%

Luminescence and Transient Absorption of CdWO₄Crystals

1999

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“…Nanocrystalline CaWO 4 has attracted particular interest because of its practical applications, such as laser host materials in quantum electronics and scintillators in medical devices [1][2][3][4][5][6]. It has been reported that CaWO 4 of scheelite-like structures is an excellent blue-emitting phosphor by their radiation of ultraviolet (UV) light [7].…”

Section: Introductionmentioning

confidence: 99%

Dielectric studies of nanocrystalline calcium tungstate

Aloysius¹,

Rintu²,

Muhammed³

et al. 2016

Nanosystems: Phys. Chem. Math.

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Nanocrystalline samples of CaWO 4 were prepared at room temperature by simple chemical precipitation. The samples were characterized by X-ray diffraction and scanning electron microscopy. Energy dispersive X-ray analysis confirmed the elements present in the sample. The frequency and temperature dependence of the dielectric constant and ac electrical conductivity of the nanomaterial were investigated. Very low dielectric loss in nanocrystalline CaWO 4 powder was observed at high frequencies. The values of ac electrical conductivity calculated from the permittivity studies were found to increase as frequency increased, conforming to small polaron hopping.

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Excitonic and recombination processes in CaWO4 and CdWO4 scintillators under synchrotron irradiation

Cited by 82 publications

References 11 publications

Comparative study of optical spectra and electronic structures of CaMoO₄ and CaWO₄ crystals

Comparative study of optical spectra and electronic structures of CaMoO₄ and CaWO₄ crystals

Luminescence and Transient Absorption of CdWO₄Crystals

Dielectric studies of nanocrystalline calcium tungstate

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Excitonic and recombination processes in CaWO4 and CdWO4 scintillators under synchrotron irradiation

Cited by 82 publications

References 11 publications

Comparative study of optical spectra and electronic structures of CaMoO4 and CaWO4 crystals

Comparative study of optical spectra and electronic structures of CaMoO4 and CaWO4 crystals

Luminescence and Transient Absorption of CdWO4Crystals

Dielectric studies of nanocrystalline calcium tungstate

Contact Info

Product

Resources

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Comparative study of optical spectra and electronic structures of CaMoO₄ and CaWO₄ crystals

Comparative study of optical spectra and electronic structures of CaMoO₄ and CaWO₄ crystals

Luminescence and Transient Absorption of CdWO₄Crystals