EP0310308A2
Expired / Lapsed
EP
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Sol-gel method for forming thin luminescent films
Assignee: AT&T Inc
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Filing: 1988-09-23
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Granted: —
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Expires: 2008-09-23
Abstract
Abstract A sol-gel procedure is described for making display devices with luminescent films. The procedure typically involves hydrolysis and polymerization of an organometallic compound together with selected luminescent ions, and coating of a substrate and then heat treatment to form a polycrystalline layer. The procedure is particularly useful for making cathode ray tubes, especially those for high power operation because of the excellent luminescence characteristics obtained, good thermal contact from the luminescent layer to faceplate and low cost of the procedure. Also described are the devices obtained which exhibit a layer of complex oxide with network structure much like the corresponding bulk compound.
Inventors
- 👤 Vincent J. Fratello
- 👤 Eliezer M. Rabinovich
- 👤 Joseph Shmulovich
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 09:54
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/227; C; C09; C09K; C09K11/00; C09K11/08; C09K11/0805; C09K11/0822; C09K11/77; C09K11/7766; C09K11/77742; C09K11/77747; C09K11/7783; C09K11/77922; C09K11/77927; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/20; H01J2209/00; H01J2209/01; H01J2209/012
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
99 words
A method for fabricating a device, comprising the steps of: forming a complex oxide capable of luminescing when impinged by energy, said complex oxide including at least first and second cations; and completing the fabrication of said device, said completing step including the step of incorporating said complex oxide into said device, CHARACTERIZED IN THAT said forming step includes the step of reacting an organometallic compound which includes said first cation and is capable of undergoing polymerization when hydrolyzed with at least first and second compounds, said first compound being water and said second compound including said second cation.
Claim 2
Independent Claim
99 words
A method for fabricating a device, comprising the steps of: forming a complex oxide capable of luminescing when impinged by energy, said complex oxide including at least first and second cations; and completing the fabrication of said device, said completing step including the step of incorporating said complex oxide into said device, CHARACTERIZED IN THAT said forming step includes the step of reacting an organometallic compound which includes said first cation and is capable of undergoing polymerization when hydrolyzed with at least first and second compounds, said first compound being water and said second compound including said second cation.
Claim 3
Dependent Claim
49 words
The method of claim 1 wherein said complex oxide includes at least a third cation in addition to said first and second cations, and wherein said organometallic compound is reacted with at least a third compound, which includes said third cation, in addition to said first and second compounds.
Claim 4
Dependent Claim
18 words
The method of claim 1 in which the complex oxide is formed as a film on a substrate.
Claim 5
Dependent Claim
14 words
The method of claim 1 in which the organometallic compound is a metal alkoxide.
Claim 6
Dependent Claim
22 words
The method of claim 4 in which the metal is selected from the group consisting of silicon, aluminium, titanium, germanium and tungsten.
Claim 7
Dependent Claim
11 words
The method of claim 5 in which the metal is silicon.
Claim 8
Dependent Claim
12 words
The method of claim 6 in which the metal alkoxide is tetraethylorthosilicate.
Claim 9
Dependent Claim
27 words
The method of claim 1 in which the second cation is selected from the group consisting of rare earth ions (atomic numbers 57-71), lanthanum, lutetium and yttrium.
Claim 10
Dependent Claim
11 words
The method claim 8 in which the second cation is yttrium.
Claim 11
Dependent Claim
23 words
The method of claim 2 in which the third cation is selected from the group consisting of rare earth ions (atomic numbers 58-70).
Claim 12
Dependent Claim
26 words
The method of claim 1 in which the organometallic compound is tetraethylorthosilicates, the second cation is yttrium and a third cation is added to provide luminescence.
Claim 13
Dependent Claim
12 words
The method of claim 11 in which the third cation is terbium.
Claim 14
Dependent Claim
72 words
The method of claim 12 in which the forming step includes a. dissolving the tetraethylorthosilicate in ethyl alcohol to form a tetraethylorthosilicate solution; b. dissolving yttrium nitrate and terbium nitrate in water to form a yttrium-terbium solution; c. mixing the tetraethylorthosilicate solution and yttrium-terbium solution together to form a coating solution; d. coating a substrate with the coating solution; e. heat treating the coated substrate to form a luminescent complex oxide layer.
Claim 15
Dependent Claim
19 words
The method of claim 13 in which the heat treatment comprises heating the coated substrate to at least 900°C.
Claim 16
Dependent Claim
15 words
The method of claim 14 in which the coated substrate is heated to approximately 1300°C.
Claim 17
Dependent Claim
14 words
The method of claim 1 in which the device comprises a cathode ray tube.
Claim 18
Dependent Claim
9 words
A device made by the method of claim 1.
Claim 19
Dependent Claim
14 words
The device of claim 17 in which the device comprises a cathode ray tube.
References Cited (Backward Citations)
No citation records indexed.
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