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EP0083071A1
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Phosphor and radiographic intensifying screen
Assignee: Fujifilm Holdings Corp
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Filing: 1982-12-22
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Granted: —
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Expires: 2002-12-22
Abstract
Abstract A divalent europium activated complex halide phosphor having the formula: in which Me" is at least one alkaline earth metal selected from the group consisting of Ba, Sr and Ca; Me' is at least one alkali metal selected from the group consisting of Li, Na, K, Rb and Cs; Me'" is at least one divalent metal selected from the group consisting of Be and Mg; Me"' is at least one trivalent metal selected from the group consisting of Aℓ, Ga, In and Tf; A is a metal oxide; X is at least one halogen selected from the group consisting of Cℓ, Br and l; each of X', X" and X" is at least one halogen selected from the group consisting of F, Cℓ, Br and l; a, b and c are numbers satisfying the conditions of 0≦a≦10 -2 , 0≦b≦10 -2 , 0≦c≦10 -2 , and a+b+c≧10 -6 ; and d and e are numbers satisfying the conditions of 0<d≦0.5 and 0<e≦0.2, respectively. A radiographic intensifying screen containing said phosphor is also disclosed.
Inventors
- 👤 Kenji C/O Fuji Photo Film Co. Ltd. Takahashi
- 👤 Terumi C/O Fuji Photo Film Co. Ltd. Matsuda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 17:46
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7728; C09K11/7729; C09K11/7731; C09K11/7734; C09K11/77342; C09K11/77344; G; G21; G21K; G21K4/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
171 words
A divalent europium activated complex halide phosphor having the formula: in which Me II is at least one alkaline earth metal selected from the group consisting of Ba, Sr and Ca; Me I is at least one alkali metal selected from the group consisting of Li, Na, K, Rb and Cs; Me II is at least one divalent metal selected from the group consisting of Be and Mg; Me III is at least one trivalent metal selected from the group consisting of Al, Ga, In and Tl; A is a metal oxide; X is at least one halogen selected from the group consisting of Cl, Br and I; each of X', X" and X"' is at least one halogen selected from the group consisting of F, C&, Br and I; a, b and c are numbers satisfying the conditions of 0≦a≦10 -2 , 0≦b≦10 -2 , 0≦c≦10 -2 , and a+b+c≧10 -6 ; and d and e are numbers satisfying the conditions of 0<d ≤0 . 5 and 0<e ≤0.2, respectively.
Claim 2
Dependent Claim
171 words
A divalent europium activated complex halide phosphor having the formula: in which Me II is at least one alkaline earth metal selected from the group consisting of Ba, Sr and Ca; Me I is at least one alkali metal selected from the group consisting of Li, Na, K, Rb and Cs; Me II is at least one divalent metal selected from the group consisting of Be and Mg; Me III is at least one trivalent metal selected from the group consisting of Al, Ga, In and Tl; A is a metal oxide; X is at least one halogen selected from the group consisting of Cl, Br and I; each of X', X" and X"' is at least one halogen selected from the group consisting of F, C&, Br and I; a, b and c are numbers satisfying the conditions of 0≦a≦10 -2 , 0≦b≦10 -2 , 0≦c≦10 -2 , and a+b+c≧10 -6 ; and d and e are numbers satisfying the conditions of 0<d ≤0 . 5 and 0<e ≤0.2, respectively.
Claim 3
Dependent Claim
13 words
The phosphor as claimed in Claim 1, in which Me II is Ba.
Claim 4
Dependent Claim
34 words
The phosphor as claimed in Claim 1, in which A is at least one metal oxide selected from the group consisting of MgO, Al 2 O 3 , SiO 2 and TiO 2 .
Claim 5
Dependent Claim
20 words
The phosphor as claimed in Claim 1, in which d is a number satisfying the conditon of 10 -5 ≦d≦0.3.
Claim 6
Dependent Claim
24 words
The phosphor as claimed in Claim 1, in which e is a number satisfying the condition of 10 -4 ≦ e ≦3x10 -2 .
Claim 7
Dependent Claim
188 words
A radiographic intensifying screen comprising support and at least one phosphor layer placed thereon, in which at least one phosphor layer comprises a divalent europium activated complex halide phosphor having the formula: in which Me II is at least one alkaline earth metal selected from the group consisting of Ba, Sr and Ca; Me is at least one alkali metal selected from the group consisting of Li, Na, K, Rb and Cs; Me II is at least one divalent metal selected from the group consisting of Be and Mg; Me III is at least one trivalent metal selected from the group consisting of Al, Ga, In and Tl; A is a metal oxide; X is at least one halogen selected from the group consisting of Cl, Br and I; each of X', X" and X"' is at least one halogen selected from the group consisting of F, Cl, Br and I; a, b and c are numbers satisfying the conditions of 0≦a≦10 -2 , 0≦b≦10 -2 , 0≦c≦10 -2 , and a+b+c≧10 -6 ; and d and e are numbers satisfying the conditions of 0<d≦0.5 and 0<e<0.2, respectively.
Claim 8
Dependent Claim
188 words
A radiographic intensifying screen comprising support and at least one phosphor layer placed thereon, in which at least one phosphor layer comprises a divalent europium activated complex halide phosphor having the formula: in which Me II is at least one alkaline earth metal selected from the group consisting of Ba, Sr and Ca; Me is at least one alkali metal selected from the group consisting of Li, Na, K, Rb and Cs; Me II is at least one divalent metal selected from the group consisting of Be and Mg; Me III is at least one trivalent metal selected from the group consisting of Al, Ga, In and Tl; A is a metal oxide; X is at least one halogen selected from the group consisting of Cl, Br and I; each of X', X" and X"' is at least one halogen selected from the group consisting of F, Cl, Br and I; a, b and c are numbers satisfying the conditions of 0≦a≦10 -2 , 0≦b≦10 -2 , 0≦c≦10 -2 , and a+b+c≧10 -6 ; and d and e are numbers satisfying the conditions of 0<d≦0.5 and 0<e<0.2, respectively.
Claim 9
Dependent Claim
16 words
The radiographic intensifying screen as claimed in Claim 6, in which Me II is B a.
Claim 10
Dependent Claim
36 words
The radiographic intensifying screen as claimed in Claim 6, in which A is at least one metal oxide selected from the group consisting of MgO, Al 2 O 3 , SiO 2 and TiO 2 .
Claim 11
Dependent Claim
22 words
The radiographic intensifying screen as claimed in Claim 6, in which d is a number satisfying the condition of 10 -5 ≦d≦0.3.
Claim 12
Dependent Claim
24 words
The radiographic intensifying screen as claimed in Claim 6, in which e is a number satisfying the condition of 10 -4 ≦e≦3x10 -2 .
References Cited (Backward Citations)
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