US3767459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making electron energy sensitive phosphors for multi-color cathode ray tubes
Assignee: General Electric Co
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Filing: 1971-09-27
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Granted: 1973-10-23
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Expires: 1991-09-27
Abstract
Abstract A method is disclosed for making multi-component phosphor structures whose emission color depends on the energy of the electrons used to excite them. The method comprises the mixing of two or more component phosphors, each component phosphor having particles with non-luminescent interior core regions and nonluminescent exterior surface regions separated by a luminescent region, the region dimensions and emission color of each component being distinct. These structures are formed by diffusing activating and/or coactivating impurities partially into the particles, or by growth of activated material on the outside of non-luminescent material, and by the subsequent diffusion of luminescence killing impurities partially into the luminescent region.
Inventors
- 👤 J Kingsley
- 👤 J Prener
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:54
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/0805; C09K11/0811; H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/26
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
40 words
The method of claim 1 further comprising the step of: diffusing a killer impurity into the surface of said luminescent outer region to produce a phosphor having an inert core and a non-luminescent outer region separated by a luminescent region.
Claim 2
Dependent Claim
85 words
The method of claim 1 wherein the step of activating comprises: adding a solution of silver nitrate to a water slurry of the zinc sulfide crystallite growth until a concentration of silver equal to approximately 10 5 to 10 3 gram-atoms of silver per mole of zinc-cadmium sulfide is obtained; drying the mixture; and firing the dried mixture in a hydrogen sulfide atmosphere for 15 minutes to 5 hours at a temperature of 500* to 1,200* C to diffuse the silver into the zinc-cadmium sulfide.
Claim 3
Dependent Claim
96 words
The method of claim 3 wherein the step of coactivating comprises: adding a solution of an aluminum salt to a water slurry of the zinc-cadmium sulfide containing silver until a concentration of aluminum equal to 10 5 to 10 3 gram-atoms of aluminum per mole of zinc-cadmium sulfide is obtained; and heating a dried mixture of the aluminum coactivated zinc-cadmium sulfide phosphor particles in a dry hydrogen sulfide atmosphere for 5 minutes to 12 hours at a temperature of 400* to 1,200* C to produce a phosphor having an inert core and a luminescent outer region.
Claim 4
Dependent Claim
40 words
The method of claim 4 further comprising the step of: diffusing a killer impurity into the surface of said luminescent outer region to produce a phosphor having an inert core and a non-luminescent outer region separated by a luminescent region.
Claim 5
Dependent Claim
86 words
The method of claim 1 wherein the step of activating comprises: adding a solution of copper nitrate to a water slurry of the zinc sulfide crystallite growth until a concentration of copper equal to approximately 10 5 to 10 3 gram-atoms of copper per mole of zinc-cadmium sulfide is obtained; drying the mixture; and firing the dried mixture in a hydrogen sulfide atmosphere for 15 minutes to 5 hours at a temperature of 500* C to 1,200* C to diffuse the copper into the zinc-cadmium sulfide.
Claim 6
Dependent Claim
96 words
The method of claim 6 wherein the step of coactivating comprises: adding a solution of an aluminum salt to a water slurry of the zinc-cadimium sulfide containing copper until a concentration of aluminum equal to 10 5 to 10 3 gram-atoms of aluminum per mole of zinc-cadmium sulfide is obtained; and heating a dried mixture of the aluminum coactivated zinc-cadmium sulfide phosphor particles in a dry hydrogen sulfide atmosphere for 5 minutes to 12 hours at a temperature of 400* to 1,200* C to produce a phosphor having an inert core and a luminescent outer region.
Claim 7
Dependent Claim
40 words
The method of claim 7 further comprising the step of: diffusing a killer impurity into the surface of said luminescent outer region to produce a phosphor having an inert core and a non-luminescent outer region separated by a luminescent region.
References Cited (Backward Citations)
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US2982740A
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US2999818A
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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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |