Gte Laboratories Incorporated

Gte Products Corporation

Richard A Gary

Keith A Klinedinst

Silvia E Lichtensteiger

A coated electroluminescent phosphor and an electroluminescent device using the phosphor. The phosphor is coated with a hydrolyzed alkylaluminum coating which renders the phosphors insensitive to atmospheric moisture. The coating process involves vaporizing an aluminum-containing precursor such as trimethylaIuminum or triethylaluminum in an inert gas stream and passing this through a fluidized bed containing the phosphor particles. Water vapor is also passed through the fluidized bed and the water and aluminum precursor react on the surface of the phosphor particles to form hydrolyzed trimethylaluminum or other alkylaluminum. The electroluminescent device includes a first transparent electrode and a second electrode; an electroluminescent phosphor layer disposed between the first electrode and the second electrode; and a transparent substrate supporting the first electrode. The first electrode is disposed between the transparent substrate and the phosphor layer. The phosphor layer includes a phosphor having a coating of hydrolyzed alkylaluminum.

Moisture insensitive zinc sulfide electroluminescent materials and an

A process is disclosed for coating phosphors with hydrolyzed alkylaluminum. The hydrolyzed alkylaluminum coating renders the phosphors insensitive to atmospheric moisture. the coating process involves vaporizing an aluminum-containing precursor such as trimethylaluminum or triethylaluminum in an inert gas stream and passing this through a fluidized bed containing the phosphor particles. Water vapor is also passed through the fluidized bed and the water and aluminum precursor react on the surface of the phosphor particles to form hydrolyzed trimethylaluminum or other alkylaluminum. The hydrolyzed trimethylaluminum or other alkylaluminum phosphors are particularly useful in electroluminescent lamps.

Method for making moisture insensitive zinc sulfide based luminescent

Disclosed is a method for applying a continuous protective coating to the surface of individual phosphor particles. The method involves chemical vapor deposition of an aluminum oxide coating on individual particles of a phosphor powder while the particles are suspended in a fluidized bed. The particles in the fluidized bed are exposed to vaporized coating precursor material, preferably aluminum isopropoxide at a temperature above 300.degree. C. The bed is kept at as nearly an isothermal condition as possible. Prior to entering the fluidized bed the aluminum isopropoxide is vaporized and kept at a temperature less than the decomposition temperature of aluminum isopropoxide. Mechanical means are used to help increase the fluidization efficiency of the fluidized bed. After coating the phosphor particles for approximately 30 minutes the vaporized precursor material is shut off from the bed entrance and the oxygen flow rate to the fluidized bed is increased. This carbon reduction step lasts for approximately 15 minutes. The coating step and carbon reduction step can be repeated to increase the thickness of the aluminum oxide coating on the phosphor particles.

Method for coating phosphor particles using aluminum isopropoxide

Disclosed is a method for applying a continuous protective coating to the surface of individual phosphor particles. The method involves chemical vapor deposition of an aluminum oxide coating on individual particles of a phosphor powder while the particles are suspended in a fluidized bed. The particles in the fluidized bed are exposed to vaporized coating precursor material, preferably aluminum isopropoxide at a temperature above 300.degree. C. The bed is kept at as nearly an isothermal condition as possible. Prior to entering the fluidized bed the aluminum isopropoxide is vaporized and kept at a temperature less than the decomposition temperature of aluminum isopropoxide. Mechanical means are used to help increase the fluidization efficiency of the fluidized bed. After coating the phosphor particles for approximately 30 minutes the vaporized precursor material is shut off from the bed entrance and the oxygen flow rate to the fluidized bed is increased. This carbon reduction step last for approximately 15 minutes. The coating step and carbon reduction step can be repeated to increase the thickness of the aluminum oxide coating on the phosphor particles.

A lithium/oxyhalide electrochemical cell in which the lithium anode electrode is coated with a cured epoxy resin film.

Electrochemical cell

A primary electrochemical cell having an oxidizable active anode material, a cathode current collector, and an electrolytic solution comprising a liquid cathode material and an electrolyte solute dissolved therein. The cathode current collector includes a catalytic material comprising a mixture of carbon and a polymer which is the product of the reaction of a transition metal salt such as ferric acetylacetonate or colbaltic acetylacetonate with tetracyanoethylene.

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Everett, MA, United States of America

Richard A Gary