US4512912A
Expired / Lapsed
US
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White luminescent phosphor for use in cathode ray tube
Assignee: Toshiba Corp
•
Filing: 1984-08-06
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Granted: 1985-04-23
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Expires: 2004-08-06
Abstract
Abstract Disclosed is a white luminescent phosphor for use in a cathode ray tube, which comprises a mixture of at least one phosphor having a composition of the following formula: In.sub.1-p-q-r M.sub.p Eu.sub.q Tb.sub.r BO.sub.3 wherein M represents at least one element selected from the group consisting of Sc, Lu, Y, La, Gd and Ga; and each of p, q and r represents a number satisfying the relationships of p≧0, q≧0, r≧0 and 0<p+q+r<1, and having a 10% afterglow period of 10 milliseconds or longer, and a blue luminescent phosphor having the composition of ZnS:Ag.
Inventors
- 👤 Naotoshi Matsuda
- 👤 Yoshinori Tetsuishi
- 👤 Kazuaki Higuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:32
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/778; C09K11/7728; C09K11/774; C09K11/7743; C09K11/7755; C09K11/7783; C09K11/7797; H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/187; Y; Y02; Y02B; Y02B20/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
113 words
A white emitting luminescent phosphor for use in a cathode ray tube, which consists essentially of a mixture of from about 10 to 40 wt.% of a blue luminescent phosphor having the composition of ZnS:Ag, and having a 10% afterglow period of at least 10 microseconds, and at least one phosphor having a composition of the following formula: In.sub.1-p-q-r M.sub.p Eu.sub.q Tb.sub.r BO.sub.3 wherein M represents at least one element selected from the group consisting of Sc, Lu, Y, La, Gd and Ga; and each of p, q, and r represents a number satisfying the relationships of p≧0, q≧0, r≧0 and 0<p+q+r<1, and having a 10% afterglow period of 10 milliseconds or longer.
Claim 2
Dependent Claim
113 words
A white emitting luminescent phosphor for use in a cathode ray tube, which consists essentially of a mixture of from about 10 to 40 wt.% of a blue luminescent phosphor having the composition of ZnS:Ag, and having a 10% afterglow period of at least 10 microseconds, and at least one phosphor having a composition of the following formula: In.sub.1-p-q-r M.sub.p Eu.sub.q Tb.sub.r BO.sub.3 wherein M represents at least one element selected from the group consisting of Sc, Lu, Y, La, Gd and Ga; and each of p, q, and r represents a number satisfying the relationships of p≧0, q≧0, r≧0 and 0<p+q+r<1, and having a 10% afterglow period of 10 milliseconds or longer.
Claim 3
Dependent Claim
21 words
The phosphor according to claim 1, wherein said numbers represented by p, q and r are 0.2≧p≧0, 0.04≧q≧0, and 0.04≧r≧0, repsectively.
Claim 4
Dependent Claim
21 words
The phosphor according to claim 1, wherein said ZnS:Ag phosphor is mixed in an amount ranging from 10 to 30 wt.%.
Claim 5
Dependent Claim
34 words
The phosphor according to claim 1, wherein said white emitting luminescent phosphor has the following composition: ______________________________________
ZnS:Ag 25 wt. %
In.sub.0.995 Tb.sub.0.005 BO.sub.3
47.5 wt. %
In.sub.0.97 Eu.sub.0.03 BO.sub.3
27.5 wt. %.
______________________________________
Claim 6
Dependent Claim
35 words
The phosphor according to claim 1, wherein said white emitting luminescent phosphor has the following composition: ______________________________________
ZnS:Ag 20 wt. %
In.sub.0.995 Tb.sub.0.005 BO.sub.3
42 wt. %
In.sub.0.996 Eu.sub.0.003 Tb.sub.0.001 BO.sub.3
38 wt. %.
______________________________________
Claim 7
Dependent Claim
35 words
The phosphor according to claim 1, wherein said white emitting luminescent phosphor has the following composition: ______________________________________
ZnS:Ag 25 wt. %
In.sub.0.995 Tb.sub.0.005 BO.sub.3
47.5 wt. %
In.sub.0.76 Y.sub.0.2 Eu.sub.0.04 BO.sub.3
27.5 wt. %.
______________________________________
Claim 8
Dependent Claim
35 words
The phosphor according to claim 1, wherein said white emitting luminescent phosphor has the following composition: ______________________________________
ZnS:Ag 25 wt. %
In.sub.0.995 Tb.sub.0.005 BO.sub.3
47.5 wt. %
In.sub.0.86 Sc.sub.0.1 Eu.sub.0.04 BO.sub.3
27.5 wt. %.
______________________________________
Claim 9
Dependent Claim
35 words
The phosphor according to claim 1, wherein said white emitting luminescent phosphor has the following composition: ______________________________________
ZnS:Ag 26 wt. %
In.sub.0.995 Tb.sub.0.005 BO.sub.3
43 wt. %
In.sub.0.92 Lu.sub.0.05 Eu.sub.0.03 BO.sub.3
31 wt. %.
______________________________________
Claim 10
Dependent Claim
35 words
The phosphor according to claim 1, wherein said white emitting luminescent phosphor has the following composition: ______________________________________
ZnS:Ag 25 wt. %
In.sub.0.945 La.sub.0.05 Tb.sub.0.005 BO.sub.3
49 wt. %
In.sub.0.97 Eu.sub.0.03 BO.sub.3
26 wt. %.
______________________________________
Claim 11
Dependent Claim
35 words
The phosphor according to claim 1, wherein said white emitting luminescent phosphor has the following composition: ______________________________________
ZnS:Ag 26 wt. %
In.sub.0.995 Tb.sub.0.005 BO.sub.3
45 wt. %
In.sub.0.96 Gd.sub.0.01 Eu.sub.0.03 BO.sub.3
29 wt. %.
______________________________________
Claim 12
Dependent Claim
35 words
The phosphor according to claim 1, wherein said white emitting luminescent phosphor has the following composition: ______________________________________
ZnS:Ag 27 wt. %
In.sub.0.985 Ga.sub.0.01 Tb.sub.0.005 BO.sub.3
44 wt. %
In.sub.0.97 Eu.sub.0.03 BO.sub.3
29 wt. %.
______________________________________
Claim 13
Dependent Claim
29 words
The phosphor according to claim 1, wherein said white emitting luminescent phosphor has the following composition: ______________________________________
ZnS:Ag 26 wt. %
In.sub.0.9974 Eu.sub.0.0007 Tb.sub.0.0019 BO.sub.3
74 wt. %.
______________________________________
Claim 14
Dependent Claim
44 words
The phosphor according to claim 1, wherein said white emitting luminescent phosphor has the following composition: ______________________________________
ZnS:Ag 26 wt. %
In.sub.0.9974 Eu.sub.0.0007 Tb.sub.0.0019 BO.sub.3
59 wt. %
In.sub.0.9945 Eu.sub. 0.0005 Tb.sub.0.005 BO.sub.3
11 wt. %
In.sub.0.996 Eu.sub.0.0035 Tb.sub.0.0005 BO.sub.3
4 wt. %.
______________________________________
References Cited (Backward Citations)
US3394084A
Cited
US3922233A
Cited
JPS5315280A
Cited
SU907058A1
Cited
JPS5751783A
Cited
JPS57128778A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-22 | 1988-10-22 | 1989-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-22 | 1992-10-22 | 1993-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-22 | 1996-10-22 | 1997-04-23 | $7700.00 | Window Closed / Lapsed |