Reduction of lag in yttrium tantalate x-ray phosphors

Details Reduction of lag in yttrium tantalate x-ray phosphors Reduction of lag in yttrium tantalate x-ray phosphors

1996-10-23

1998-02-10

Bonner, Melissa

Compositions

Inorganic luminescent compositions

Compositions containing halogen; e.g., halides and oxyhalides

423593, 423263, C09K 1178

Patent

active

057165467

ABSTRACT:
Phosphor lag was reduced to acceptable levels in high lag monoclinic M' yttrium tantalate x-ray phosphors through the addition of minor amounts europium to the phosphors. In particular, europium was added to yttrium tantalate phosphors containing terbium and to phosphors formulated with a stoichiometric excess of yttrium.

REFERENCES:
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patent: 4857741 (1989-08-01), Yokota et al.
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patent: 5009807 (1991-04-01), Reddy
patent: 5112524 (1992-05-01), Reddy et al.
patent: 5141673 (1992-08-01), Zegarski
Brixner, L.H. & Chen, H.Y., On the Structural and Luminescent Properties of the M' LnTaO.sub.4 Rare Earth Tantalates, J. Electrochem. Soc., v 130, n. 12, 2435-43 (1983), no month.
Blasse, G. & Bril, A., Luminescene Phenomena in Compounds with Ferusonite Structure, J. Luminescene, 3, 109-131 (1970), no month.
Blasse, G. & Bril, Luminescence in Some Tantalate Host Lattices, J. Solid State Chem., 3, 69-74 (1971), no month.
Derwent WPI Abstract, WPI Acc. No. 82-01258J/47, JP 571689892, (1982), no month.

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