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US4336154A
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Phosphor and radiation image storage panel utilizing the same
Assignee: Mitsubishi Chemical Corp
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Filing: 1981-07-14
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Granted: 1982-06-22
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Expires: 2001-07-14
Abstract
Abstract A divalent metal fluorohalide phosphor having a compositional formula: (Ba1-x, MIIx)F2.aBaX2:yEu,zB (wherein, MII is at least one member selected from the group consisting of beryllium, magnesium, calcium, strontium, zinc, and cadmium, X is at least one member selected from the group consisting of chlorine, bromine, and iodine, and a, x, y, and z are numbers satisfying the respective conditions 0.5</=a</= 1.25, 0</=x</=1, 10-6</=y</=2x10-1, and 0<z</=2x10-1), when exposed to and allowed to absorb radiation or ionizing radiation and subsequently excited with a light of 450 to 800 nm of wave length, provides stimulated emission of light with heretofore unattainable high luminance. A radiation image storage panel is produced by depositing on a support a phosphor layer formed of the phosphor of this invention.
Inventors
- 👤 Yoshitugu Nishimura
- 👤 Noboru Kotera
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:26
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7728; C09K11/7732; C09K11/7733
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
105 words
A divalent metal fluorohalide phosphor represented by the compositional formula: (Ba.sub.1-x,M.sup.II.sub.x)F.sub.2.aBaX.sub.2 :yEu,zB wherein, M II is at least one member selected from the group consisting of beryllium, magnesium, calcium, strontium, zinc, and cadmium, X is at least one member selected from the group consisting of chlorine, bromine, and iodine, and a, x, y, and z are numbers satisfying the respective conditions 0.5≦a≦1.25, 0≦x≦1, 10 -6 ≦y≦2×10 -1 , and 0<z≦2×10 -1 and exhibiting a higher luminance than said phosphor absent B when it is exposed to and allowed to absorb radiation and is subsequently excited with light having a wavelength of 450 to 800 nm.
Claim 2
Dependent Claim
105 words
A divalent metal fluorohalide phosphor represented by the compositional formula: (Ba.sub.1-x,M.sup.II.sub.x)F.sub.2.aBaX.sub.2 :yEu,zB wherein, M II is at least one member selected from the group consisting of beryllium, magnesium, calcium, strontium, zinc, and cadmium, X is at least one member selected from the group consisting of chlorine, bromine, and iodine, and a, x, y, and z are numbers satisfying the respective conditions 0.5≦a≦1.25, 0≦x≦1, 10 -6 ≦y≦2×10 -1 , and 0<z≦2×10 -1 and exhibiting a higher luminance than said phosphor absent B when it is exposed to and allowed to absorb radiation and is subsequently excited with light having a wavelength of 450 to 800 nm.
Claim 3
Dependent Claim
23 words
The divalent metal fluorohalide phosphor according to claim 1, wherein said y is a number satisfying the condition 10 -5 ≦y≦10 -2 .
Claim 4
Dependent Claim
26 words
The divalent metal fluorohalide phosphor according to claim 1 or claim 2, wherein said z is a number satisfying the condition 3×10 -4 ≦z≦10 -1 .
Claim 5
Dependent Claim
117 words
A radiation image storage panel comprising a phosphor layer formed of a stimulable divalent metal fluorohalide phosphor represented by the compositional formula: (Ba.sub.1-x,M.sup.II.sub.x)F.sub.2.aBaX.sub.2 :yEu,zB wherein, M II is at least one member selected from the group consisting of beryllium, magnesium, calcium, strontium, zinc, and cadmium, X is at least one member selected from the group consisting of chlorine, bromine, and iodine, and a, x, y, and z are numbers satisfying the respective conditions 0.5≦a≦1.25, 0≦x≦1, 10 -6 ≦y≦2×10 -1 , and 0≦z≦2×10 -1 and exhibiting a higher luminance than said phosphor absent B when it is exposed to and allowed to absorb radiation and is subsequently excited with light having a wavelength of 450 to 800 nm.
Claim 6
Dependent Claim
117 words
A radiation image storage panel comprising a phosphor layer formed of a stimulable divalent metal fluorohalide phosphor represented by the compositional formula: (Ba.sub.1-x,M.sup.II.sub.x)F.sub.2.aBaX.sub.2 :yEu,zB wherein, M II is at least one member selected from the group consisting of beryllium, magnesium, calcium, strontium, zinc, and cadmium, X is at least one member selected from the group consisting of chlorine, bromine, and iodine, and a, x, y, and z are numbers satisfying the respective conditions 0.5≦a≦1.25, 0≦x≦1, 10 -6 ≦y≦2×10 -1 , and 0≦z≦2×10 -1 and exhibiting a higher luminance than said phosphor absent B when it is exposed to and allowed to absorb radiation and is subsequently excited with light having a wavelength of 450 to 800 nm.
Claim 7
Dependent Claim
23 words
The radiation image storage panel according to claim 4, wherein said y is a number satisfying the condition 10 -5 ≦y≦10 -2 .
Claim 8
Dependent Claim
26 words
The radiation image storage panel according to claim 4 or claim 5, wherein said z is a number satisfying the condition 3×10 -4 ≦z≦10 -1 .
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-06-21 | 1985-12-21 | 1986-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-21 | 1989-12-21 | 1990-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-21 | 1993-12-21 | 1994-06-22 | $7700.00 | Window Closed / Lapsed |