US4996003A
Expired / Lapsed
US
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Titanium activated hafnia and/or zirconia host phosphor containing a selected rare earth
Assignee: Carestream Health Inc
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Filing: 1990-06-29
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Granted: 1991-02-26
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Expires: 2010-06-29
Abstract
Abstract An intensifying screen is disclosed containing a phosphor composition comprised of monoclinic crystals of a titanium activated hafnia phosphor host containing ions of one or more rare earths selected from among those having an atomic number of 39, 62 to 64 inclusive, and 67 to 71 inclusive. A phosphor composition in which zirconia is at least partially substituted for hafnia is also disclosed.
Inventors
- 👤 Philip S. Bryan
- 👤 Patrick M. Lambert
- 👤 Christine M. Towers
- 👤 Gregory S. Jarrold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:02
CPC Classifications
G; G21; G21K; G21K4/00; C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/7767; C09K11/7769; C09K11/7783; C09K11/7784; C09K11/7787; C01; C01P; C01P2002/00; C01P2002/50; C01P2002/70; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
115 words
A phosphor capable of absorbing X-radiation and emitting longer wavelength radiation comprised of monoclinic crystals of a titanium activated hafnium dioxide and/or zirconium dioxide host consisting essentially of oxygen and combined elements satisfying the relationship DTiu.sub.x M.sub.y L'.sub.w wherein D is at least one of zirconium and hafnium ions; M is at least one alkali metal; L' is at least one of yttrium, ytterbium, and lutetium; w is in the range of from 1×10 -6 to 1×10 -3 ; x is in the range of from 3×10 -4 to 1.0; and y is up to 1; the phosphor exhibiting reduced afterglow when excited above X-radiation as compared to the phosphor as defined above absent L'.
Claim 2
Dependent Claim
115 words
A phosphor capable of absorbing X-radiation and emitting longer wavelength radiation comprised of monoclinic crystals of a titanium activated hafnium dioxide and/or zirconium dioxide host consisting essentially of oxygen and combined elements satisfying the relationship DTiu.sub.x M.sub.y L'.sub.w wherein D is at least one of zirconium and hafnium ions; M is at least one alkali metal; L' is at least one of yttrium, ytterbium, and lutetium; w is in the range of from 1×10 -6 to 1×10 -3 ; x is in the range of from 3×10 -4 to 1.0; and y is up to 1; the phosphor exhibiting reduced afterglow when excited above X-radiation as compared to the phosphor as defined above absent L'.
Claim 3
Dependent Claim
24 words
A phosphor containing monoclinic crystals according to claim 1 in which w is in the range of 2× 10 -6 to 5×10 -4 .
Claim 4
Dependent Claim
114 words
A phosphor capable of absorbing X-radiation and emitting longer wavelength radiation comprised of monoclinic crystals of a titanium activated hafnium dioxide and/or zirconium dioxide host consisting essentially of oxygen and combined elements satisfying the relationship DTi.sub.x M.sub.y L".sub.w wherein D is at least one of zirconium and hafnium ions; M is at least one alkali metal; L" is at least one of erbium and holmium; w is in the range of from 1×10 -6 to 5×10 -4 ; x is in the range of from 3×10 -4 to 1.0; and y is up to 1; the phosphor exhibiting reduced afterglow when excited by X-radiation as compared to the phosphor as defined above absent L".
Claim 5
Dependent Claim
114 words
A phosphor capable of absorbing X-radiation and emitting longer wavelength radiation comprised of monoclinic crystals of a titanium activated hafnium dioxide and/or zirconium dioxide host consisting essentially of oxygen and combined elements satisfying the relationship DTi.sub.x M.sub.y L".sub.w wherein D is at least one of zirconium and hafnium ions; M is at least one alkali metal; L" is at least one of erbium and holmium; w is in the range of from 1×10 -6 to 5×10 -4 ; x is in the range of from 3×10 -4 to 1.0; and y is up to 1; the phosphor exhibiting reduced afterglow when excited by X-radiation as compared to the phosphor as defined above absent L".
Claim 6
Dependent Claim
24 words
A phosphor containing monoclinic crystals according to claim 3 in which w is in the range of 1× 10 -5 to 2×10 -4 .
Claim 7
Dependent Claim
105 words
A phosphor capable of absorbing X-radiation and emitting longer wavelength radiation comprised of monoclinic crystals of a titanium activated hafnium dioxide and/or zirconium dioxide host consisting essentially of oxygen and combined elements satisfying the relationship DTi.sub.x M.sub.y Sm.sub.w wherein D is at least one of zirconium and hafnium ions; M is at least one alkali metal; w is in the range of from 1×10 -4 to 5×10 -3 ; x is in the range of from 3×10 -4 to 1.0; and y is up to 1; the phosphor exhibiting reduced afterglow when excited by X-radiation as compared to the phosphor as defined above absent samarium.
Claim 8
Dependent Claim
105 words
A phosphor capable of absorbing X-radiation and emitting longer wavelength radiation comprised of monoclinic crystals of a titanium activated hafnium dioxide and/or zirconium dioxide host consisting essentially of oxygen and combined elements satisfying the relationship DTi.sub.x M.sub.y Sm.sub.w wherein D is at least one of zirconium and hafnium ions; M is at least one alkali metal; w is in the range of from 1×10 -4 to 5×10 -3 ; x is in the range of from 3×10 -4 to 1.0; and y is up to 1; the phosphor exhibiting reduced afterglow when excited by X-radiation as compared to the phosphor as defined above absent samarium.
Claim 9
Dependent Claim
23 words
A phosphor containing monoclinic crystals according to claim 5 in which w is in the range of 2×10 -4 to 3×10 -4 .
Claim 10
Dependent Claim
106 words
A phosphor capable of absorbing X-radiation and emitting longer wavelength a radiation comprised of monoclinic crystals of a titanium activated hafnium dioxide and/or zirconium dioxide host consisting essentially of oxygen and combined elements satisfying the relationship DTi.sub.x M.sub.y Eu.sub.w wherein D is at least one of zirconium and hafnium ions; M is at least one alkali metal; w is in the range of from 1×10 -6 to 1×10 -2 ; x is in the range of from 3×10 -4 to 1.0; and y is up to 1; the phosphor exhibiting reduced afterglow when excited by X-radiation as compared to the phosphor as defined above absent europium.
Claim 11
Dependent Claim
106 words
A phosphor capable of absorbing X-radiation and emitting longer wavelength a radiation comprised of monoclinic crystals of a titanium activated hafnium dioxide and/or zirconium dioxide host consisting essentially of oxygen and combined elements satisfying the relationship DTi.sub.x M.sub.y Eu.sub.w wherein D is at least one of zirconium and hafnium ions; M is at least one alkali metal; w is in the range of from 1×10 -6 to 1×10 -2 ; x is in the range of from 3×10 -4 to 1.0; and y is up to 1; the phosphor exhibiting reduced afterglow when excited by X-radiation as compared to the phosphor as defined above absent europium.
Claim 12
Dependent Claim
24 words
A phosphor containing monoclinic crystals according to claim 7 in which w is in the range of 1× 10 -5 to 5×10 -3 .
Claim 13
Dependent Claim
105 words
A phosphor capable of absorbing X-radiation and emitting longer wavelength radiation comprised of monoclinic crystals of a titanium activated hafnium dioxide and/or xirconium dioxide host consisting essentially of oxygen and combined elements satisfying the relationship DTi.sub.x M.sub.y Gd.sub.w wherein D is at least one of zirconium and hafnium ions; M is at least one alkali metal; w is in the range of from 2×10 -6 to 1×10 -2 ; x is in the range of from 3×10 -4 to 1.0; and y is up to 1; the phosphor exhibiting reduced afterglow when excited by X-radiation as compared to the phosphor as defined above absent gadolinium.
Claim 14
Dependent Claim
105 words
A phosphor capable of absorbing X-radiation and emitting longer wavelength radiation comprised of monoclinic crystals of a titanium activated hafnium dioxide and/or xirconium dioxide host consisting essentially of oxygen and combined elements satisfying the relationship DTi.sub.x M.sub.y Gd.sub.w wherein D is at least one of zirconium and hafnium ions; M is at least one alkali metal; w is in the range of from 2×10 -6 to 1×10 -2 ; x is in the range of from 3×10 -4 to 1.0; and y is up to 1; the phosphor exhibiting reduced afterglow when excited by X-radiation as compared to the phosphor as defined above absent gadolinium.
Claim 15
Dependent Claim
24 words
A phosphor containing monoclinic crystals according to claim 9 in which w is in the range of 1× 10 -5 to 2×10 -3 .
Claim 16
Dependent Claim
105 words
A phosphor capable of absorbing X-radiation and emitting longer wavelength radiation comprised of monoclinic crystals of a titanium activated hafnium dioxide and/or zirconium dioxide host consisting essentially of oxygen and combined elements satisfying the relationship DTi.sub.x M.sub.y Tm.sub.w wherein D is at least one of zirconium and hafnium ions; M is at least one alkali metal; w is in the range of from 1×10 -6 to 1×10 -3 ; x is in the range of from 3×10 -4 to 1.0; and y is up to 1; the phosphor exhibiting reduced afterglow when excited by X-radiation as compared to the phosphor as defined above absent thulium.
Claim 17
Dependent Claim
105 words
A phosphor capable of absorbing X-radiation and emitting longer wavelength radiation comprised of monoclinic crystals of a titanium activated hafnium dioxide and/or zirconium dioxide host consisting essentially of oxygen and combined elements satisfying the relationship DTi.sub.x M.sub.y Tm.sub.w wherein D is at least one of zirconium and hafnium ions; M is at least one alkali metal; w is in the range of from 1×10 -6 to 1×10 -3 ; x is in the range of from 3×10 -4 to 1.0; and y is up to 1; the phosphor exhibiting reduced afterglow when excited by X-radiation as compared to the phosphor as defined above absent thulium.
Claim 18
Dependent Claim
24 words
A phosphor containing monoclinic crystals according to claim 11 in which w is in the range of 2× 10 -6 to 3×10 -4 .
Claim 19
Dependent Claim
31 words
A phosphor containing monoclinic crystals according to any one of claims 1 to 12 inclusive in which hafnium and zirconium satisfy the relationship: Hf.sub.1-z Zr.sub.z wherein z is up to 0.3.
Claim 20
Dependent Claim
20 words
A phosphor containing monoclinic crystals according to claim 13 in which z is at least 4×10 -4 up to 0.3.
Claim 21
Dependent Claim
22 words
A phosphor containing monoclinic crystals according to claim 14 in which z is in the range of from 1×10 -3 to 0.2.
Claim 22
Dependent Claim
23 words
A phosphor containing monoclinic crystals according to claim 15 in which z is in the range of from 2× 10 -3 to 0.1.
Claim 23
Dependent Claim
28 words
A phosphor containing monoclinic crystals according to any one of claims 1 to 12 inclusive in which x is in the range of from 3×10 -4 to 0.5.
Claim 24
Dependent Claim
23 words
A phosphor containing monoclinic crystals according to claim 17 in which x is in the range of from m3× 10 -4 to 0.25.
Claim 25
Dependent Claim
23 words
A phosphor containing monoclinic crystals according to claim 17 in which y is in the range of from 1× 10 -4 to 0.2.
Claim 26
Dependent Claim
38 words
A phosphor containing monoclinic crystals according to claim 19 in which y is in the range of from at least 8×10 -4 to 0.2 and the alkali metal ions include at least one of lithium, sodium, and potassium.
Claim 27
Dependent Claim
30 words
A phosphor containing monoclinic crystals according to any one of claims 1 to 12 inclusive in which y is in the range of from at least 1×10 -4 to 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) | 1994-02-25 | 1994-08-27 | 1995-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-25 | 1998-08-27 | 1999-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-25 | 2002-08-27 | 2003-02-26 | $7700.00 | Window Closed / Lapsed |