(Barium hafnate: Cu) phosphors and phosphor screens
AssigneeEastman Kodak Company
InventorsPatrick Maddock Lambert, Gregory S. Jarrold, David Paul Trauernicht
Life of this patent
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Abstract
(Barium halfnate:Cu) phosphors and phosphor screens. The phosphor screens include a support and a luminescent portion. The phosphor includes oxygen and a combination of species characterized by the relationship: (Ba.sub.1-q M.sub.q)(Hf.sub.1-z-e Zr.sub.z Mg.sub.e):yT where M is selected from the group consisting of Ca and Sr and combinations thereof; T is Cu; q is from 0 to 0.15; z is from 0 to 1; e is from 0 to 0.10; z+e is from 0 to 1; and y is from 1.times.10.sup.-6 to 0.02.
Claims22
A radiographic phosphor screen comprising a support and, coated on the support, at least one layer forming a luminescent portion and an overcoat layer, said luminescent portion and overcoat layer including a binder that is transparent to X-radiation and emitted light and said luminescent portion including phosphor particles in a weight ratio of phosphor particles to binder of 7:1 to 25:1, said phosphor comprising oxygen and a combination of species characterized by the relationship:
- (Ba.sub.1-q M.sub.q)(Hf.sub.1-z-e Zr.sub.z Mg.sub.e):yT
- wherein
- M is selected from the group consisting of Ca and Sr and combinations thereof;
- T is Cu;
- q is from 0 to 0.15;
- z is from 0 to 1;
- e is from 0 to 0.10;
- z+e is from 0 to 1;
- y is from 1.times.10.sup.-6 to 0.02.
A phosphor comprising oxygen and a combination of species characterized by the relationship:
- (Ba.sub.1-q M.sub.q)(Hf.sub.1-z-e Zr.sub.z Mg.sub.e):yT
- wherein
- M is selected from the group consisting of Ca and Sr and combinations thereof;
- T is Cu;
- q is from 0 to 0.15;
- z is from 0 to 1;
- e is from 0 to 0.10;
- z+e is from 0 to 1;
- y is from 1.times.10.sup.-6 to 0.02.
A phosphor comprising oxygen and a combination of species characterized by the relationship:
- (Ba.sub.1-a-b Ca.sub.a Sr.sub.b)(Hf.sub.1-z-e Zr.sub.z Mg.sub.e).wQ:yT
- wherein
- Q is at least one of Li and K;
- T is Cu;
- a is from 0 to 0.05;
- b is from 0 to 0.15;
- a+b is from 0 to 0.15;
- z is from 1.times.10.sup.-5 to 1;
- e is from 0 to 0.05;
- z+e is from 1.times.10.sup.-5 to 1;
- w is from 1.times.10.sup.-6 to 5.times.10.sup.-2 ;
- and
- y is from 1.times.10.sup.-6 to 0.02.
A phosphor consisting essentially of oxygen and a combination of species characterized by the relationship:
- (Ba.sub.1-a-b Ca.sub.a Sr.sub.b)(Hf.sub.1-z-e Zr.sub.z Mg.sub.e).wLi.xGe:yT
- wherein
- T is Cu;
- a is from 0 to 0.05;
- b is from 0 to 0.15;
- a+b is from 0 to 0.15;
- z is from 1.times.10.sup.-5 to 1;
- e is from 0 to 0.05;
- z+e is from 1.times.10.sup.-5 to 1;
- w is from 0 to 0.05;
- x is from 0 to 1.5.times.10.sup.-3 ;
- w+x is from 1.times.10.sup.-6 to 0.05;
- and
- y is from 1.times.10.sup.-6 to 0.02.
Dependencies are inferred from the claim text.