US5077144A
Expired / Lapsed
US
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Phosphor and radiographic intensifying screen
Assignee: Fujifilm Holdings Corp
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Filing: 1987-07-27
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Granted: 1991-12-31
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Expires: 2007-07-27
Abstract
Abstract A divalent europium activated complex halide phosphor having the formula: Me.sup.II FX·aMe.sup.I X'·bMe'.sup.II X".sub.2 ·cMe III X"' 3 ·dA:eEu 2+ 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 consistingo 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. A radiographic intensifying screen containing said phosphor is also disclosed.
Inventors
- 👤 Kenji Takahashi
- 👤 Terumi Matsuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:25
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
195 words
A divalent europium activated complex phosphor having the formula: Me.sup.II FX·aNaX'·dA:eEu.sup.2+ in which Me II is at least one alkaline earth metal selected from the group consisting of Ba, Sr, and Ca; A is at least one metal oxide selected from the group consisting of BeO, MgO, CaO, SrO, ZnO, Al 2 O 3 , Y 2 O 3 , La 2 O 3 , In 2 O 3 , SiO 2 , TiO 2 , ZrO 2 , GeO 2 , SnO 2 , Nb 2 O 5 , Ta 2 O 5 and ThO 2 ; X is at least one halogen selected from the group consisting of Cl, Br and I; X' is at least one halogen selected from the group consisting of F, Cl, Br, and I; a is a number satisfying the condition of 10 -6 ≦a≦10 -2 ; and d and e are numbers satisfying the conditions of 0<d≦0.5 and 0<e≦0.2, respectively, said phosphor showing higher emission luminance and shorter afterglow upon excitation with X-rays as compared with the corresponding phosphor having the formula: Me.sup.II FX:eEu.sup.2+ wherein Me II , X and e have the same meanings as above.
Claim 2
Dependent Claim
195 words
A divalent europium activated complex phosphor having the formula: Me.sup.II FX·aNaX'·dA:eEu.sup.2+ in which Me II is at least one alkaline earth metal selected from the group consisting of Ba, Sr, and Ca; A is at least one metal oxide selected from the group consisting of BeO, MgO, CaO, SrO, ZnO, Al 2 O 3 , Y 2 O 3 , La 2 O 3 , In 2 O 3 , SiO 2 , TiO 2 , ZrO 2 , GeO 2 , SnO 2 , Nb 2 O 5 , Ta 2 O 5 and ThO 2 ; X is at least one halogen selected from the group consisting of Cl, Br and I; X' is at least one halogen selected from the group consisting of F, Cl, Br, and I; a is a number satisfying the condition of 10 -6 ≦a≦10 -2 ; and d and e are numbers satisfying the conditions of 0<d≦0.5 and 0<e≦0.2, respectively, said phosphor showing higher emission luminance and shorter afterglow upon excitation with X-rays as compared with the corresponding phosphor having the formula: Me.sup.II FX:eEu.sup.2+ wherein Me II , X and e have the same meanings as above.
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 condition of 10 -5 ≦d≦0.3.
Claim 6
Dependent Claim
22 words
The phosphor as claimed in claim 1, in which e is a number satisfying the condition of 10 -4 ≦e≦3×10 -2 .
Claim 7
Dependent Claim
219 words
A radiographic intensifying screen comprising a 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: Me.sup.II FX·aNaX'·dA:eEu.sup.2+ in which Me II is at least one alkaline earth metal selected from the group consisting of Ba, Sr, and Ca; A is at least one metal oxide selected from the group consisting of BeO, MgO, CaO, SrO, ZnO, Al 2 O 3 , Y 2 O 3 , La 2 O 3 , In 2 O 3 , SiO 2 , TiO 2 , ZrO 2 , GeO 2 , SnO 2 , Nb 2 O 5 , Ta 2 O 5 and ThO 2 ; X is at least one halogen selected from the group consisting of Cl, Br and I; X' is at least one halogen selected from the group consisting of F, Cl, Br, and I; a is a number satisfying the condition of 10 -6 ≦a≦10 -2 ; and d and e are numbers satisfying the conditions of 0<d≦0.5 and 0<e≦0.2, respectively, said phosphor showing higher emission luminance and shorter afterglow upon excitation with X-rays as compared with the corresponding phosphor having the formula: Me.sup.II FX:eEu.sup.2+ wherein Me II , X and e have the same meanings as above.
Claim 8
Dependent Claim
219 words
A radiographic intensifying screen comprising a 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: Me.sup.II FX·aNaX'·dA:eEu.sup.2+ in which Me II is at least one alkaline earth metal selected from the group consisting of Ba, Sr, and Ca; A is at least one metal oxide selected from the group consisting of BeO, MgO, CaO, SrO, ZnO, Al 2 O 3 , Y 2 O 3 , La 2 O 3 , In 2 O 3 , SiO 2 , TiO 2 , ZrO 2 , GeO 2 , SnO 2 , Nb 2 O 5 , Ta 2 O 5 and ThO 2 ; X is at least one halogen selected from the group consisting of Cl, Br and I; X' is at least one halogen selected from the group consisting of F, Cl, Br, and I; a is a number satisfying the condition of 10 -6 ≦a≦10 -2 ; and d and e are numbers satisfying the conditions of 0<d≦0.5 and 0<e≦0.2, respectively, said phosphor showing higher emission luminance and shorter afterglow upon excitation with X-rays as compared with the corresponding phosphor having the formula: Me.sup.II FX:eEu.sup.2+ wherein Me II , X and e have the same meanings as above.
Claim 9
Dependent Claim
15 words
The radiographic intensifying screen as claimed in claim 6, in which Me II is Ba.
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≦3×10 -2 .
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-30 | 1995-07-01 | 1995-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-30 | 1999-07-01 | 1999-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-30 | 2003-07-01 | 2003-12-31 | $7700.00 | Window Closed / Lapsed |