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Long Decay phoaphors
Assignee: Nichia Chemical Industries Ltd
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Filing: 1994-06-10
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Granted: 1994-12-27
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Expires: 2014-06-10
Abstract
Abstract Long decay phosphors are disclosed that are comprised of rare-earth activated divalent, boron-substituted aluminates. In particular, the long decay phosphors are comprised of MO.a(Al1-bBb)2O3:cR, wherein 0.5</=a</=10.0, 0.0001</=b</=0.5 and 0.0001</=c</=0.2, MO represents at least one divalent metal oxide selected from the group consisting of MgO, CaO, SrO and ZnO and R represents Eu and at least one additional rare earth element. Preferably, R represents Eu and at least one additional rare earth element selected from the group consisting of Pt, Nd, Dy and Tm.
Inventors
- 👤 Martin R. Royce
- 👤 Hiroto Tamaki
- 👤 Yoshinori Murazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:46
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7783; C09K11/7797
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
76 words
A long decay phosphor comprising a composition of MO.a(Al.sub.1-b B.sub.b).sub.2 O.sub.3 :cR, wherein 0.5≦a≦10.0, 0.0001≦b≦0,5, 0.0001≦c≦0.2, MO represents at least one divalent metal oxide selected from the group consisting of MgO, CaO, SrO and ZnO and R represents E 2+ and at least one additional rare earth element selected from the group consisting of Pr, Nd, Dy and Tm, the additional rare earth element being present in an amount sufficient to effect enhanced long decay phosphorescence.
Claim 2
Dependent Claim
76 words
A long decay phosphor comprising a composition of MO.a(Al.sub.1-b B.sub.b).sub.2 O.sub.3 :cR, wherein 0.5≦a≦10.0, 0.0001≦b≦0,5, 0.0001≦c≦0.2, MO represents at least one divalent metal oxide selected from the group consisting of MgO, CaO, SrO and ZnO and R represents E 2+ and at least one additional rare earth element selected from the group consisting of Pr, Nd, Dy and Tm, the additional rare earth element being present in an amount sufficient to effect enhanced long decay phosphorescence.
Claim 3
Dependent Claim
25 words
The long decay phosphor of claim 1 wherein MO represents at least one divalent metal oxide selected from the group consisting of CaO and SrO.
Claim 4
Dependent Claim
14 words
The long decay phosphor of claim 1 wherein R represents Eu 2+ and Pr.
Claim 5
Dependent Claim
14 words
The long decay phosphor of claim 1 wherein R represents Eu 2+ and Nd.
Claim 6
Dependent Claim
14 words
The long decay phosphor of claim 1 wherein R represents Eu 2+ and Dy.
Claim 7
Dependent Claim
14 words
The long decay phosphor of claim 1 wherein R represents Eu 2+ and Tm.
Claim 8
Dependent Claim
51 words
The long decay phosphor of claim 1 wherein 0.6≦a≦1.5, 0.001≦b≦0.1 and 0.002≦c≦0.1 and MO represents from 70 to 100 mole percent CaO, relative to the total divalent metal oxide content, and 0 to 30 mole percent of a divalent metal oxide selected from the group consisting of MgO, SrO and ZnO.
Claim 9
Dependent Claim
32 words
The long decay phosphor of claim 7 wherein MO represents from 70 to 100 mole percent CaO, relative to the total divalent metal oxide content, and 0 to 30 mole percent SrO.
Claim 10
Dependent Claim
18 words
The long decay phosphor of claim 7 wherein said composition comprises: CaO.1.025(Al.sub.0.976 B.sub.0.024).sub.2 O.sub.3 :0.005 Eu.sup.2+, 0.015 Nd.
Claim 11
Dependent Claim
14 words
The long decay phosphor of claim 7 wherein R represents Eu 2+ and Nd.
Claim 12
Dependent Claim
14 words
The long decay phosphor of claim 7 wherein R represents Eu 2+ and Tm.
Claim 13
Dependent Claim
51 words
The long decay phosphor of claim 1 wherein 1.5≦a≦3.0, 0.001≦b≦0.1 and 0.001≦c≦0.1 and MO represents from 70 to 100 mole percent SrO, relative to the total divalent metal oxide content, and 0 to 30 mole percent of the divalent metal oxide selected from the group consisting of MgO, CaO and ZnO.
Claim 14
Dependent Claim
32 words
The long decay phosphor of claim 12 wherein MO represents from 70 to 100 mole percent SrO, relative to the total divalent metal oxide content, and 0 to 30 mole percent CaO.
Claim 15
Dependent Claim
18 words
The long decay phosphor of claim 12 wherein said composition comprises SrO.2.10(Al.sub.0.952 B.sub.0.048).sub.2 O.sub.3 :0.005 Eu.sup.2+, 0.020 Dy.
Claim 16
Dependent Claim
18 words
The long decay phosphor of claim 12 wherein said composition comprises SrO.2.10(Al.sub.0.952 B.sub.0.048).sub.2 O.sub.3 :0.005 Eu.sup.2+, 0.020 Dy.
Claim 17
Dependent Claim
14 words
The ions decay phosphor of claim 12 wherein R represents Eu 2+ and Pr.
Claim 18
Dependent Claim
13 words
The long decay phosphor of claim 12 wherein represents Eu 2+ and Dy.
Claim 19
Dependent Claim
12 words
The long decay phosphor of claim 1 wherein 0.6≦a≦1.5, 0.001≦b≦0.1, and 0.001≦c≦0.1.
Claim 20
Dependent Claim
25 words
The long decay phosphor of claim 18 wherein MO represents at least one divalent metal oxide selected from the group consisting of CaO and SrO.
Claim 21
Dependent Claim
18 words
The long decay phosphor of claim 18 wherein said composition comprises SrO.1.025(Al.sub.0.976 B.sub.0.024).sub.2 O.sub.3 :0.005 Eu.sup.2+, 0.015 Dy.
Claim 22
Dependent Claim
14 words
The long decay phosphor of claim 18 wherein R represents Eu 2+ and Dy.
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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) | 1997-12-26 | 1998-06-27 | 1998-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-12-26 | 2002-06-27 | 2002-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-12-26 | 2006-06-27 | 2006-12-27 | $7700.00 | Window Closed / Lapsed |