Influence of the Charge Transfer on Eu3+ Luminescence Spectra

Gaigerova, L. S.; Dudnik, O. F.; Zolin, V. F.; Kudryashova, V. A.

doi:10.1007/978-1-4684-2043-2_71

Cited by 4 publications

(4 citation statements)

References 2 publications

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“…At similar excitation the energy stores in the phosphor at "dissociation" of the excited state of the charge transfer in yttrium oxysulfides, in the result of Eu 2+ ions and "holes" -S − ions form [23]. Based on the obtained results it can be assumed that both at the X-rays irradiation and an optical excitation in the band of the charge transfer of Y 2 O 3 :Eu sample [7,8,22] energy goes to Eu 3+ through (Eu 2+ O − ) complexes (states) of the charge transfer with the following scheme:…”

Section: Discussion Of the Resultsmentioning

confidence: 90%

“…The recombination energy of the exciton is nonradiatively transmitted to Eu 3+ for the transition of ion into the excited state from which it spontaneously returns to the main state with the simultaneous emission of the light quantum. The luminescence of Eu 3+ in Y 2 O 3 is very effectively optical excited in a charge transfer band [22]. At similar excitation the energy stores in the phosphor at "dissociation" of the excited state of the charge transfer in yttrium oxysulfides, in the result of Eu 2+ ions and "holes" -S − ions form [23].…”

Section: Discussion Of the Resultsmentioning

confidence: 99%

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The Influence of Europium Impurity on the Recombination Luminescence in Y₂O₃

Novosad

Bordun

et al. 2018

Acta Phys. Pol. A

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In this work the researched results of the spectral characteristics of the luminescence and the thermostimulated luminescence curves of Y2O3 and Y2O3:Eu ceramic materials at the X-ray excitation in the 85-295 K range were generalized. Considering the features of Y2O3 crystal structure and the possibility of the formation of the shortlived and stable hole and electron centers of V -and F -type by the ionizing radiation X-ray luminescence spectrum of ceramics at 85 K is fitted into the elementary Gaussian shape bands with the maxima near 3.40, 3.06, 2.67, 2.33, 2.09, and 1.91 eV. The main 3.40 and 3.06 eV bands of the luminescence are caused by the self-trapped excitons of (YO6) 9− complex, when the cation is localized in the field of the trigonal (C3i) and monoclinic (C2) symmetries. The emission at 2.67 eV and the weak bands in the 1.65-2.61 eV region are considered as the radiation of excitons localized on the anion vacancies and the electron centers of F -type (F + , F and F − ). The thermoluminescence of Y2O3 in the 186 and 204 K main peaks range is connected with the thermal destruction of the self-trapped states of O − ions that located in the field of the trigonal and monoclinic symmetries. The activator bands caused by 5 D0 → 7 Fj electronic transitions in Eu 3+ are only observed in the X-ray and thermostimulated luminescence spectra of Y2O3:Eu ceramics. It was assumed that both at the X-rays irradiation and an optical excitation in the band of the charge transfer of Y2O3:Eu sample the energy goes to Eu 3+ through (Eu 2+ O − ) complexes (states) of the charge transfer.

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Section: Discussion Of the Resultsmentioning

confidence: 90%

Section: Discussion Of the Resultsmentioning

confidence: 99%

The Influence of Europium Impurity on the Recombination Luminescence in Y₂O₃

Novosad

Bordun

et al. 2018

Acta Phys. Pol. A

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“…It is noted that the 5 D 0 → 7 F 0 transition is often observed in the materials in which the site symmetries of Eu 3+ are relatively low [22]. The charge compensation for trivalent ions substituted for divalent ions gives rise to a distortion of the site symmetry allowing a stronger interaction of the 5 D 0 and 7 F 0 states with the charge transfer band of Eu 3+ [30,31]. In the case of SrB 2 O 4 , the crystal has a plane structure of Sr 2+ in which no other ions are positioned between the neighbouring Sr 2+ ions.…”

Section: Discussionmentioning

confidence: 99%

“…Admixing of the highlying odd-parity states into the 5 D 0 and 7 F 0 states through the crystal field potential leads to the strong 5 D 0 → 7 F 0 emission by the breakdown of the closure approximation in the Judd-Ofelt theory. This is the case when the charge transfer band is taken as an admixing excited state [30].…”

Section: Discussionmentioning

confidence: 99%

Optical properties of europium ions in SrB₂O₄crystal

Seo¹,

Moon²,

Kim³

et al. 1999

J. Phys.: Condens. Matter

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We investigate absorption, emission and excitation properties of an SrB2O4:Eu crystal grown from the melt using the Czochralski method. Eu2+ absorption and Eu3+ emission spectra are obtained. The five broad absorption bands peaking at 344, 288, 259, 235 and 212 nm correspond to the transitions from the 4f7(8S7/2) ground state to the excited states of the 4f65d configuration of Eu2+. Several zero-phonon lines for the different 4f6(7FJ) levels of the lowest 4f65d excited state are observed in the absorption spectrum measured at 10 K. The deep-orange luminescence in the 578-640 nm region is due to the transition from the 5D0 excited state to the 7FJ (J = 0, 1 and 2) states of Eu3+.Eu2+ does not give rise to luminescence, even at 10 K, because of the photoionization in the excited state, followed by a nonradiative return to the ground state of Eu2+. The strong emission due to the 5D0 7F0 transition and the existence of different sites of Eu3+ for Sr2+ are explained by the charge compensation and structural characteristic of SrB2O4.

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