US4539506A
Expired / Lapsed
US
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Red-emitting superlinear phosphor
Assignee: International Business Machines Corp
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Filing: 1983-09-19
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Granted: 1985-09-03
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Expires: 2003-09-19
Abstract
Abstract In a red-emitting phosphor which includes ZnSe as a host material, copper (Cu) as an activator and aluminum (Al) as a coactivator, the improvement comprising the inclusion of a small amount of cobalt (Co) to provide superlinear characteristics to said phosphor in combination with said Cu and Al. A preferred range of concentration of said Co is 10 -6 -2×10 -5 g atom/mol. A specific application of said red-emitting superlinear phosphor is as a phosphor screen for a current density sensitive, single gun color CRT, when mixed with a green-emitting sublinear phosphor.
Inventors
- 👤 Hiroko Ohtani
- 👤 Kazuharu Toyokawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:49
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/88; C09K11/881; C09K11/883; H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/187
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
31 words
A red-emitting phosphor which includes ZnSe as a host material, Cu as an activator and Al as a coactivator, and Co in amount sufficient to impart superlinear characteristics to said phosphor.
Claim 2
Dependent Claim
31 words
A red-emitting phosphor which includes ZnSe as a host material, Cu as an activator and Al as a coactivator, and Co in amount sufficient to impart superlinear characteristics to said phosphor.
Claim 3
Dependent Claim
20 words
A red-emitting phosphor, as recited in claim 1, wherein the concentration of Co is 10 -6 -2×10 -5 g atom/mol.
Claim 4
Dependent Claim
45 words
A red-emitting phosphor, as recited in claim 1, wherein the concentrations of Cu, Al and Co are as follows: X≦X' 10.sup.-4 ≦X≦5×10.sup.-3 g atom/mol 10.sup.-6 ≦Y≦2×10.sup.-5 g atom/mol where, X is concentration of Cu, X' is concentration of Al, and Y is concentration of Co.
Claim 5
Dependent Claim
23 words
A red-emitting phosphor, as recited in claim 3, wherein Se is replaced by S in the range of less than 15 mol percent.
Claim 6
Dependent Claim
23 words
A red-emitting phosphor, as recited in claim 3, wherein Zn is replaced by Cd in the range of less than 10 mol percent.
Claim 7
Dependent Claim
56 words
A phosphor screen for a current-sensitive, single-gun color CRT, comprising the mixture of a red-emitting superlinear phosphor ZnSe having Cu, and Al as activator and coativator respectively and a small concentration of, Co sufficient to render said phosphor superlinear and a green-emitting sublinear phosphor selected from Zn 2 SiO 4 : Mn and (Zn, Cd)S: Ag.
Claim 8
Dependent Claim
56 words
A phosphor screen for a current-sensitive, single-gun color CRT, comprising the mixture of a red-emitting superlinear phosphor ZnSe having Cu, and Al as activator and coativator respectively and a small concentration of, Co sufficient to render said phosphor superlinear and a green-emitting sublinear phosphor selected from Zn 2 SiO 4 : Mn and (Zn, Cd)S: Ag.
Claim 9
Dependent Claim
20 words
A phosphor screen, as recited in claim 6, wherein the concentration of Co is 10 -6 -2×10 -5 g atom/mol.
Claim 10
Dependent Claim
41 words
A phosphor screen, as recited in claim 7, wherein the concentration of Mn is 10 -2 -10 -4 g atom/mol, the molar ratio of ZnS:CdS is 45:55 to 65:35, and the concentration of Ag is 10 -5 -10 -7 g atom/mol.
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) | 1988-09-02 | 1989-03-04 | 1989-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-02 | 1993-03-04 | 1993-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-02 | 1997-03-04 | 1997-09-03 | $7700.00 | Window Closed / Lapsed |