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US5369331A
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Pigment-attached blue-emitting phosphor and color cathode-ray tube
Assignee: Mitsubishi Chemical Corp
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Filing: 1993-02-03
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Granted: 1994-11-29
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Expires: 2013-02-03
Abstract
Abstract The present invention provides a pigment-attached blue-emitting phosphor having attached a blue pigment which has fastness and chemical stability and is excellent in reflection spectrum characteristics, and a color cathode-ray tube having a blue-emitting fluorescent layer containing the blue pigment formed on the inner surface of a face plate. The present invention also provides a pigment-attached blue-emitting phosphor having a CoO.ZnO.SiO2 type blue pigment attached thereto, and a color cathode-ray tube provided with a blue-emitting fluorescent layer containing the blue pigment particles on the inner surface of a face plate.
Inventors
- 👤 Tomohito Mizukami
- 👤 Chihito Funayama
- 👤 Yasuo Oguri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:29
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/02; C09K11/025; C09K11/08; H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/20; H01J29/30; H01J29/32; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
54 words
A pigment-attached, blue-emitting phosphor, comprising: a blue-emitting phosphor and a blue pigment attached to the surface of the blue-emitting phosphor, in an amount of 0.3 to 30 wt. %, said blue pigment having the formula: xCoO.yZnO.zSiO.sub.2 wherein the relative amounts of oxide components of the pigment are within the ranges of 0.05≦x/z≦1.5 and 0.1≦y/z≦2.0.
Claim 2
Dependent Claim
54 words
A pigment-attached, blue-emitting phosphor, comprising: a blue-emitting phosphor and a blue pigment attached to the surface of the blue-emitting phosphor, in an amount of 0.3 to 30 wt. %, said blue pigment having the formula: xCoO.yZnO.zSiO.sub.2 wherein the relative amounts of oxide components of the pigment are within the ranges of 0.05≦x/z≦1.5 and 0.1≦y/z≦2.0.
Claim 3
Dependent Claim
65 words
The pigment-attached, blue emitting phosphor according to claim 1, wherein the blue-emitting phosphor is at least one silver-activated zinc sulfide phosphor, Y 2 SiO 5 :Ce, Ca 2 B 5 O 9 Cl:Eu, (Ba x Mg 1-x )O.nAl 2 O 3 :Eu (O≦x≦1, 7≦n≦8), SrSi 3 O 8 Cl 4 Eu, CaWO 4 , CaWO 4 :Pb, BaFCl:Eu, Gd 2 O 2 S:Tb or ZnS:Zn.
Claim 4
Dependent Claim
87 words
A pigment-attached, blue-emitting phosphor according to claim 1 wherein said blue pigment is obtained by: adding an aqueous alkaline solution to an aqueous solution containing cobalt and zinc to co-precipitate cobalt and zinc as hydroxides, replacing the water of the combined solutions with an organic solvent, and adding a silicon raw material capable of depositing silicon oxide by hydrolysis thereto, depositing silicon oxide on the surface of the precipitated hydroxides by hydrolysis, and firing the resulting precipitate at a temperature of 700° to 1000° C. in air.
Claim 5
Dependent Claim
83 words
A pigment-attached, blue-emitting phosphor according to claim 1 wherein said blue pigment is obtained by: adding to an aqueous solution containing cobalt and zinc, an organic compound, as a precipitating agent, which is capable of being dissolved in water and reacting with cobalt and zinc to form a hardly water-soluble or water-insoluble material, thereby co-precipitating cobalt and zinc, drying the precipitated material obtained, mixing the dried material with silicon oxide, and firing the obtained mixture at a temperature of 800°-1100° C. in air.
Claim 6
Dependent Claim
22 words
The pigment-attached blue-emitting phosphor according to claim 1, wherein the pigment has an average particle size of not more than 0.5 micron.
Claim 7
Dependent Claim
39 words
A color cathode-ray tube, comprising: a face plate having, on the inner surface thereof, a blue-emitting fluorescent layer, a red-emitting fluorescent layer and a green-emitting fluorescent layer, said blue-emitting fluorescent layer containing the pigment-attached, blue-emitting phosphor of claim 1.
Claim 8
Dependent Claim
49 words
The color cathode-ray tube according to claim 6, wherein the blue-emitting fluorescent layer contains a silver-activated zinc sulfide phosphor, the red-emitting fluorescent layer contains a europium activated yttrium oxysulfide phosphor or a europium-activated yttrium oxide phosphor, and the green-emitting fluorescent layer contains a copper-and an aluminum-activated zinc sulfide phosphor.
Claim 9
Dependent Claim
21 words
The color cathode-ray tube according to claim 6, wherein the red-emitting fluorescent layer contains a red pigment of red iron oxide.
Claim 10
Dependent Claim
20 words
The color cathode-ray tube according to claim 6, wherein the green-emitting fluorescent layer contains a TiO 2 .ZnO.CoO.NiO green pigment.
Claim 11
Dependent Claim
59 words
A color cathode-ray tube, comprising a face plate having, on the inner surface thereof, a blue-emitting fluorescent layer, wherein a blue pigment layer is coated between the face plate and the blue-emitting fluorescent layer, said blue pigment having the formula: xCoO.yZnO.zSiO.sub.2 wherein the relative amounts of oxide components of the pigment are within the range of 0.05≦x/z≦1.5 and 0.1≦y/z≦2.0.
Claim 12
Dependent Claim
59 words
A color cathode-ray tube, comprising a face plate having, on the inner surface thereof, a blue-emitting fluorescent layer, wherein a blue pigment layer is coated between the face plate and the blue-emitting fluorescent layer, said blue pigment having the formula: xCoO.yZnO.zSiO.sub.2 wherein the relative amounts of oxide components of the pigment are within the range of 0.05≦x/z≦1.5 and 0.1≦y/z≦2.0.
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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) | 1997-11-28 | 1998-05-30 | 1998-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-11-28 | 2002-05-30 | 2002-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-11-28 | 2006-05-30 | 2006-11-29 | $7700.00 | Window Closed / Lapsed |