Abstract: A new fluidized bed particle coating method is disclosed by the use of which coatings can be uniformly and conveniently deposited on the surfaces of fluidized particulate materials by vapor deposition processes at temperatures lower than those of the heated coating precursor transport lines. By this method, particle materials with relatively low surface temperatures may be brought into close proximity with a coating precursor containing gas stream characterized by a substantially higher gas volume temperature in such a way that the vaporized precursor molecules are caused to adsorb or condense on the relatively cold particle surfaces without also condensing on any other surface. Further, if the adsorbed precursor molecules are capable of reacting or polymerizing on the relatively cold particle surfaces, thus forming substantially continuous coatings on those surfaces, they may do so without also depositing such coatings on any other surfaces.

Abstract: A phosphor particle has thereon a moisture resistant treatment of a metallic nitride. By moisture resistant is meant a condition allowing the phosphor particle to fiction in a humid atmosphere for a significantly longer period of time than an untreated particle. The method of making such phosphors comprises the steps of introducing an inert gas into a reaction vessel; charging phosphor particles into the reaction vessel; heating the reaction vessel to a reaction temperature. introducing a first precursor compound such as triiosbutyl aluminum and a second precursor compound such as dimetylamine into a second reaction vessel to form a nitride precursor. The nitride precursor is hexakis(dimethylamido)dialuminum The nitride precursor is introduced into the first reaction vessel in a manner to avoid restrictive reactions.

Abstract: A new fluidized bed particle coating method is disclosed by the use of which coatings can be uniformly and conveniently deposited on the surfaces of fluidized particulate materials by vapor deposition processes at temperatures lower than those of the heated coating precursor transport lines. By this method, particle materials with relatively low surface temperatures may be brought into close proximity with a coating precursor containing gas stream characterized by a substantially higher gas volume temperature in such a way that the vaporized precursor molecules are caused to adsorb or condense on the relatively cold particle surfaces without also condensing on any other surface. Further, if the adsorbed precursor molecules are capable of reacting or polymerizing on the relatively cold particle surfaces, thus forming substantially continuous coatings on those surfaces, they may do so without also depositing such coatings on any other surfaces.

Abstract: A method of recovering a base phosphor from encapsulated phosphors, which comprises the steps of selecting a recovery vessel including a magnetic stir bar; adding to the recovery vessel, deionized water, a first batch of concentrated hydrochloric acid and encapsulated phosphor to form a stirred suspension; heating the stirred suspension to about 90° C. for about 2 hours; settling the stirred suspension; decanting the mother liquor and slurrying the remaining solids with a second batch of hydrochloric acid and water; decanting and washing the remaining solids with deionized water; filtering the remaining solids to form a filter cake; heating the filter cake at 110° C. in air for a time sufficient to form a dried filter cake; and screening the dried filter cake through a −325 mesh screen to yield a recovered base phosphor.

Abstract: A new fluidized bed particle coating method is disclosed by the use of which coatings can be uniformly and conveniently deposited on the surfaces of fluidized particulate materials by vapor deposition processes at temperatures lower than those of the heated coating precursor transport lines. By this method, particle materials with relatively low surface temperatures may be brought into close proximity with a coating precursor containing gas stream characterized by a substantially higher gas volume temperature in such a way that the vaporized precursor molecules are caused to adsorb or condense on the relatively cold particle surfaces without also condensing on any other surface. Further, if the adsorbed precursor molecules are capable of reacting or polymerizing on the relatively cold particle surfaces, thus forming substantially continuous coatings on those surfaces, they may do so without also depositing such coatings on any other surfaces.

Abstract: A new fluidized bed particle coating method is disclosed by the use of which coatings can be uniformly and conveniently deposited on the surfaces of fluidized particulate materials by vapor deposition processes at temperatures lower than those of the heated coating precursor transport lines. By this method, particle materials with relatively low surface temperatures may be brought into close proximity with a coating precursor containing gas stream characterized by a substantially higher gas volume temperature in such a way that the vaporized precursor molecules are caused to adsorb or condense on the relatively cold particle surfaces without also condensing on any other surface. Further, if the adsorbed precursor molecules are capable of reacting or polymerizing on the relatively cold particle surfaces, thus forming substantially continuous coatings on those surfaces, they may do so without also depositing such coatings on any other surfaces.

Abstract: A phosphor particle has thereon a moisture resistant treatment of a metallic nitride. By moisture resistant is meant a condition allowing the phosphor particle to function in a humid atmosphere for a significantly longer period of time than an untreated particle. The method of making such phosphors comprises the steps of introducing an inert gas into a reaction vessel; charging phosphor particles into the reaction vessel; heating the reaction vessel to a reaction temperature; introducing a nitride coating precursor into the reaction vessel; introducing a co-reactant into the reaction vessel; and maintaining the inert gas flow, co-reactant flow and precursor supply for a time sufficient to moisture-proof the phosphor particles. The nitride treated phosphor particles produced by this method, which can include the deposition of a nitride coating on the particles, have excellent efficacy ratings and strong luminance values in lamps after 100 hours use in high humidity (i.e., >95%).

Abstract: A moisture-resistant electroluminescent phosphor is provided wherein the individual phosphor particles have a first coating of an inorganic moisture-resistant coating and a second coating of an organic moisture-resistant coating. The process for making the moisture-resistant phosphor comprises applying a first layer of an inorganic moisture-resistant coating to individual particles of an electroluminescent phosphor to form a first-coated phosphor, substantially isolating said first-coated phosphor from contact with atmospheric oxygen and moisture, and applying a second layer of an organic moisture-resistant coating to the first-coated phosphor to form a second-coated phosphor.

Abstract: A phosphor particle has thereon a moisture resistant treatment of a metallic nitride. By moisture resistant is meant a condition allowing the phosphor particle to function in a humid atmosphere for a significantly longer period of time than an untreated particle. The method of making such phosphors comprises the steps of introducing an inert gas into a reaction vessel; charging phosphor particles into the reaction vessel; heating the reaction vessel to a reaction temperature; introducing a nitride coating precursor into the reaction vessel; introducing a co-reactant into the reaction vessel; and maintaining the inert gas flow, co-reactant flow and precursor supply for a time sufficient to moisture-proof the phosphor particles. The nitride treated phosphor particles produced by this method, which can include the deposition of a nitride coating on the particles, have excellent efficacy ratings and strong luminance values in lamps after 100 hours use in high humidity (i.e., >95%).

Abstract: A phosphor particle has thereon a moisture resistant treatment of a metallic nitride. By moisture resistant is meant a condition allowing the phosphor particle to function in a humid atmosphere for a significantly longer period of time than an untreated particle. The method of making such phosphors comprises the steps of introducing an inert gas into a reaction vessel; charging phosphor particles into the reaction vessel; heating the reaction vessel to a reaction temperature; introducing a nitride coating precursor into the reaction vessel; introducing a co-reactant into the reaction vessel; and maintaining the inert gas flow, co-reactant flow and precursor supply for a time sufficient to moisture-proof the phosphor particles. The nitride treated phosphor particles produced by this method, which can include the deposition of a nitride coating on the particles, have excellent efficacy ratings and strong luminance values in lamps after 100 hours use in high humidity (i.e., >95%).

Abstract: An improvement in a mercury vapor discharge lamp having an envelope of light-transmitting vitreous material containing an inert starting gas and a quantity of elemental mercury at least in part convertible to soluble mercury, and first and second electrodes located within the envelope for an arc discharge therebetween. The improvement comprises an effective amount of a soluble copper-containing compound in combination with an effective amount of a selected one of a group of materials consisting of a soluble chloride, a soluble bromide, a soluble nonmetallic iron-containing compound, and a soluble nonmetallic manganese-containing compound. The copper-containing compound and the material in combination, when the lamp is pulverized into granules and subjected to a suitable aqueous acid solution, produce a concentration of extracted mercury of less than 0.2 mg/l of the aqueous solution.

Abstract: A phosphor particle having thereon a conformal coating of aluminum nitride. By conformal coating is meant a coating that follows the surface contours of the individual particles. The method of making such phosphors comprises the steps of introducing an inert gas into a reaction vessel; charging phosphor particles into the reaction vessel; heating the reaction vessel to a reaction temperature; introducing a nitride coating precursor into the reaction vessel; introducing a coreactant into the reaction vessel; and maintaining the inert gas flow, coreactant flow and precursor supply for a time sufficient to coat the phosphor particles. The nitride coated phosphor particles produced by this method have excellent efficacy ratings and strong luminance values in lamps after 100 hours use in high humidity (i.e.,>95%).

Abstract: In a mercury vapor discharge lamp having an envelope of light-transmitting vitreous material and containing an inert gas and a quantity of elemental mercury at least partially convertible to soluble mercury, and first and second electrodes disposed within the envelope for establishing an arc discharge therebetween, an improvement comprising an effective amount of a nonmetallic copper-containing compound disposed in the lamp which, when the lamp is pulverized to granules and subjected to a suitable aqueous acid solution, dissolves in the aqueous acid solution, resulting in a concentration of extracted mercury less than 0.2 mg per liter of solution; and a method for reducing the amount of mercury extracted from a mercury vapor discharge lamp when the lamp is pulverized to granules and subjected to a suitable aqueous acid solution, such that the resulting concentration of extracted mercury is less than 0.

Abstract: A method for making a tantala/silica interference filter on a vitreous substrate, which filter retains integrity at temperatures in excess of 600.degree. C., includes the steps of depositing by low pressure chemical vapor deposition a first coating of tantala/silica on the substrate, heat treating the first coating, and depositing by low pressure chemical vapor deposition a second coating of tantala/silica, the first and second coatings in combination providing a tantala/silica interference filter with a thickness of at least 3.5 microns on the vitreous substrate. There is further presented an electric lamp having an envelope and an interference filter applied thereto, in accordance with the above method.

Abstract: A method for making a tantala/silica interference filter on the surface of a tungsten-halogen incandescent lamp having molybdenum leads includes depositing on the lamp surface by low pressure chemical vapor deposition the interference filter comprising alternating layers of tantala and silica. Thereafter, the filter is heat treated in an atmosphere of humidified inert gas containing less than 1% oxygen.

Abstract: A method for making a tantala/silica interference filter on a vitreous substrate, the filter retaining integrity at temperatures in excess of 600.degree. C., includes the steps of applying to the vitreous substrate a first coating of vitreous silica doped with submicron-sized particles, depositing on the first coating by low pressure chemical vapor deposition the filter which comprises a second coating comprising alternating layers of tantala and silica, and heat treating the substrate and first and second coatings to bond the filter to the substrate. There is further provided an electric lamp having an envelope made in accordance with the above method.

Abstract: An apparatus and method for the controlled delivery of vaporized chemical precursor to an LPCVD reactor is disclosed. A liquid flow controller is closely coupled with a highly efficient liquid vaporizer. The liquid flow controller, which contains no moving parts or polymeric seals, employs as a basic element an efficient gas-liquid separator downstream of the flow control element which assures that an uninterrupted constant velocity flow of liquid enters the high-temperature zone of the vaporizer. When the output of the vaporized-precursor delivery system is linked with the gas inlet of an LPCVD reactor, the very precise vapor delivery rates obtained translate into very precisely controlled thin film deposition rates.

Abstract: A method for making a tantala/silica interference filter on a vitreous substrate, the filter retaining integrity at temperatures in excess of 600.degree. C., includes the steps of applying to the vitreous substrate a first coating of vitreous silica doped with submicron-sized particles, depositing on the first coating by low pressure chemical vapor deposition the filter which comprises a second coating comprising alternating layers of tantala and silica, and heat treating the substrate and first and second coatings to bond the filter to the substrate. There is further provided an electric lamp having an envelope made in accordance with the above method.

Abstract: Method and apparatus for the controlled delivery of vaporized chemical precursor to a low pressure chemical vapor deposition (LPCVD) reactor. A flow of liquid precursor containing dissolved inert gas is passed through a restrictor element. The dissolved inert gas is released from the liquid precursor at or near the downstream side of the restrictor element. The inert gas is separated from the liquid precursor, thereby producing a continuous flow of liquid precursor, and this flow is fed into an inlet of a-vaporizer. The vaporized precursor is delivered into an LPCVD reactor.

Abstract: An apparatus and method for the low temperature deposition of SiO.sub.2 in a low pressure chemical vapor deposition system is disclosed. The apparatus makes use of a prereactor to form an activated form of diacetoxyditertiarybutoxysilane (DADBS) from which SiO.sub.2 is deposited. The prereactor may be positioned upstream of an SiO.sub.2 deposition reactor or may be incorporated into the front end thereof.