Sol gel method for forming thin luminescent films
AssigneeAT&T Bell Laboratories
InventorsVincent J. Fratello, Eliezer M. Rabinovich, Joseph Shmulovich
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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, expecially 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.
Claims15
A method for fabricting 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, said first cation being selected from the group consisting of silicon and aluminum, and said second cation being selected from the group consisting of rare earth elements with atomic number 57-71 and yttrium;
- and
- completing the fabrication of said device, said completing step including the step of incorporating a substrate coated with said complex oxide into said device, characterized in that
- said forming step includes the steps of
- (a) dissolving in an aqueous solution salts comprising at least one second cation element, said salts being selected from the group consisting of nitrate, chloride, bromide, iodide, and sulfate,
- (b) mixing said salts solution with a metal alkoxide containing said first cation to promote hydrolysis of said alkoxide with formation of a sol capable of gellation to provide a sol. . . (c) applying a coating of said sol to a substrate and (d) heat treating the coated substrated in a temperature range of about 800.degree. C. to 1500.degree. C.
A method for fabricating a device incorporating a complex oxide capable of liminescing when impinged by energy, which comprises the steps of
- forming complex oxide including at least a first and second cations, and
- completing the fabrication of the device by steps including incorporation of a substrate coated with the complex oxide into the device, wherein
- said forming step includes combining in an aqueous solution water-soluble salts comprising at least one second cation element and a metal alkoxide containing said first cation so as to promote hydrolysis of said alkoxide with formation of a sol capable of gellation,
- said first cation being selected from the group consisting of silicon and aluminum, said at least one second cation being selected from the group consisting of rare earth elements with atomic number 57-71 and yttrium, and said salt being selected from the group consisting of nitrate, chloride, bromide, iodide and sulfate applying a coating of said sol to a substrate and heat treating the coated substrate in the temperature range of about 800.degree. C. to 1500.degree. C.
Dependencies are inferred from the claim text.