Luminescence of europium doped in compounds with fluorite-related structures

Beaury, O.; Dexpert‐Ghys, Jeannette; Faucher, M.; Caro, P.

doi:10.1016/0022-2313(79)90114-5

Cited by 10 publications

(2 citation statements)

References 5 publications

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“…Following this hypothesis, there should be two and four non-equivalent sites for W and Y respectively in the asymmetric unit. Additional evidence came from the analysis of the fluorescence spectrum (Beaury et al, , 1979 of Eu-doped $-YEWO6. The ionic radii of Eua+, ya+ and W 6+ are 1.01 (CN7), 0.96 (CN7), 0.6 A (CN6) respectively (Shannon, 1976), so that triplyionized Eu is unable to replace W; it is selectively substituted for Y and may occupy with equal chance any of the four crystallographic sites of the latter.…”

Section: International Tables For X-ray Crystallographymentioning

confidence: 99%

“…In the course of our crystallographic and optical studies on the WOa-Y2Oa system Beaury, Dexpert-Ghys, Faucher & Caro, 1979), we have synthesized two structural forms of Y2WO6. The first obtained for T < 1773 K was a polycrystalline sample of the P2/m compound mentioned above, which we shall call fl-Y2WO6 according to Brixner, Sleight & Foris (1973).…”

Section: Introductionmentioning

confidence: 99%

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The structure of yttrium tungstate ε-Y2WO6

Beaury¹,

Faucher²,

Sagey³

1981

Acta Crystallogr Sect B

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The high-temperature polymorph &Y2WO6 is orthorhombic, space group P212121, with a = 8.591 (5), b = 20.840 (10), c = 5.233 (5) .A,Z= 8, Din= 6.38, Dc 6.49 Mg m -a. The structure was determined at room temperature from 454 diffractometer intensities and refined to R = 0.067. The W atoms are octahedrally coordinated and far apart from each other. The four non-equivalent Y atoms have an eightfold (3) and sevenfold (1) coordination number. Reference is made to the fluorescence spectrum of the Eu-doped compound and a comparison is made with the homologous compounds Ln2WO6 (Ln = La to Lu).

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Section: International Tables For X-ray Crystallographymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The structure of yttrium tungstate ε-Y2WO6

Beaury¹,

Faucher²,

Sagey³

1981

Acta Crystallogr Sect B

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Model of the electroluminescence in short-pulse-excited thin-film structures based on ZnS: Mn

Chimczak

Gordon

Bertrandt‐Zyteowiak

1984

Phys. Stat. Sol. (a)

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Short pulse excitation is investigated of SnOxZnSCuxJZnS(Mn)Al electroluminescent thin film structures. The phenomenon of time delay of the electroluminescence maximum is observed. A model of the growth and decay of the electroluminescence curve is proposed on the assumption that energy transfer takes place from Cu centres to Mn centres. Good agreement between the theoretical and experimental curves is obtained. The three parameters used in the fitting, the lifetimes of the sensitizer and activator and the electroluminescence maximum delay time are in good agreement with the experimental results and the literature data.

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Blocking effect in electroluminescence of ZnS:Mn driven by short voltage pulses

Chimczak

Bertrandt-Zytkowiak

1989

Phys. Stat. Sol. (a)

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Electroluminescent thin film cells based on luminescent active ZnS:Mn layers are investigated. Untypical behaviour of the electroluminescence compared to direct excitation luminescence is observed when the cells are excited by short voltage pulses of about 10 μs. The model of energy transfer between two monomolecular centres is taken into account to explain this phenomenon. On the base of this model, a relation describing the time dependence of luminescence during the exciting pulse is obtained. It is shown that the relation is in good agreement with experimental data.

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Luminescence of europium doped in compounds with fluorite-related structures

Cited by 10 publications

References 5 publications

The structure of yttrium tungstate ε-Y2WO6

The structure of yttrium tungstate ε-Y2WO6

Model of the electroluminescence in short-pulse-excited thin-film structures based on ZnS: Mn

Blocking effect in electroluminescence of ZnS:Mn driven by short voltage pulses

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