Patent US4097776A successfully refreshed from Google Patents.
US4097776A
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Coated electroluminescent phosphors
Assignee: United States Department of the Air Force
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Filing: 1977-03-25
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Granted: 1978-06-27
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Expires: 1997-03-25
Abstract
Abstract An electroluminescent phosphor coated with a liquid crystal. When used in electroluminescent applications, the coated phosphors are highly resistant to moisture and operate at reduced temperatures at high voltages and frequencies.
Inventors
- 👤 Sidney Allinikov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:41
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; C; C09; C09K; C09K11/00; C09K11/02; H05B33/20; C09K2323/00; Y; Y10; Y10S; Y10S428/00; Y10S428/917; Y10T; Y10T428/00; Y10T428/25; Y10T428/254; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/29; Y10T428/2982; Y10T428/2991
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
52 words
A composition consisting essentially of an electroluminescent solid particulate phosphor coated with a crystallized liquid crystal or a mixture of crystallized liquid crystals, said liquid crystal or mixture of liquid crystals melting at about the temperature to which the phosphor is heated as a result of being disposed in an electric field.
Claim 2
Dependent Claim
52 words
A composition consisting essentially of an electroluminescent solid particulate phosphor coated with a crystallized liquid crystal or a mixture of crystallized liquid crystals, said liquid crystal or mixture of liquid crystals melting at about the temperature to which the phosphor is heated as a result of being disposed in an electric field.
Claim 3
Dependent Claim
36 words
The composition according to claim 1 in which the liquid crystal or mixture of liquid crystals are cholesteryl esters having the following structural formula: ##STR3## wherein R is an alkylene radical or a divalent aromatic radical.
Claim 4
Dependent Claim
25 words
The composition according to claim 2 in which the alkylene radical contains 1 to 24, inclusive, carbon atoms and the divalent aromatic radical is ##STR4##
Claim 5
Dependent Claim
66 words
The composition according to claim 1 in which the phosphor is a compound selected from the group consisting of zinc sulfide, zinc selenide, boron nitride and aluminum nitride, said compound being doped with an element selected from the group consisting of copper, manganese, mercury, silver, iron and cadmium, and the liquid crystal or mixture of liquid crystals is a cholesteryl ester or mixture of cholesteryl esters.
Claim 6
Dependent Claim
40 words
The composition according to claim 4 in which the cholesteryl ester or mixture of cholesteryl esters is selected from the group of esters consisting of cholesteryl oleate, cholesteryl decanoate, cholesteryl nonanoate, cholesteryl uracate, cholesteryl propionate, cholesteryl benzoate, and cholesteryl acetate.
Claim 7
Dependent Claim
97 words
An electroluminescent device comprising a layer of electroluminescent phosphor particles coated with a crystallized liquid crystal or a mixture of crystallized liquid crystals, said liquid crystal or mixture of liquid crystals melting at about the temperature to which the phosphor particles are heated as a result of being disposed in an electric field, the coated particles being dispersed in a layer of a dielectric material having a thickness no greater than 3 mils; and an electrode member adhered to each surface of the phosphor-containing layer, at least one of the electrode members being a light transmitting layer.
Claim 8
Dependent Claim
97 words
An electroluminescent device comprising a layer of electroluminescent phosphor particles coated with a crystallized liquid crystal or a mixture of crystallized liquid crystals, said liquid crystal or mixture of liquid crystals melting at about the temperature to which the phosphor particles are heated as a result of being disposed in an electric field, the coated particles being dispersed in a layer of a dielectric material having a thickness no greater than 3 mils; and an electrode member adhered to each surface of the phosphor-containing layer, at least one of the electrode members being a light transmitting layer.
Claim 9
Dependent Claim
36 words
The electroluminescent device of claim 6 in which the liquid crystal or mixture of liquid crystals are cholesteryl esters having the following structural formula: ##STR5## wherein R is an alkylene radical or a divalent aromatic radical.
Claim 10
Dependent Claim
25 words
The electroluminescent device of claim 7 in which the alkylene radical contains 1 to 24, inclusive, carbon atoms and the divalent aromatic radical is ##STR6##
Claim 11
Dependent Claim
20 words
The electroluminescent device of claim 8 in which the coated phosphor particles are dispersed in a dielectric organic plastic material.
Claim 12
Dependent Claim
18 words
The electroluminescent device of claim 8 in which the coated particles are dispersed in a dielectric inorganic matrix.
References Cited (Backward Citations)
US3775631A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-26 | 1981-12-26 | 1982-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-26 | 1985-12-26 | 1986-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-26 | 1989-12-26 | 1990-06-27 | $7700.00 | Window Closed / Lapsed |