Abstract: The maintenance of a fluorescent lamp containing terbium-activated cerium magnesium aluminate phosphor is improved by combining the phosphor with a small particle size aluminum oxide and wet-milling the phosphor/aluminum oxide mixture before applying the phosphor to the interior of a fluorescent lamp envelope.

Abstract: Europium activated strontium tetraborate phosphor is reacted with strontium carbonate or strontium fluoride or ammonium fluoride in order to improve emission characteristics.

Abstract: A fluorescent lamp comprising a sealed envelope, a pair of opposing electrodes, a fill of inert gas and mercury and a phosphor coating on the internal walls of the envelope wherein the coating contains as at least one element thereof particles of europium activated barium magnesium aluminate having an average particle size of about 4 micrometers, less than about 5% of the particles having a size greater than 15 microns and less than about 5% of the particles having a size less than about 1 micron, said particles having on the external surfaces thereof a coating of sub-micron aluminum oxide having a surface area of from about 80 to about 120 square meters per gram, said coating being sufficient to impart stir in quality to said phosphor.

Abstract: A stir-in fluorescent lamp phosphor is coated with a 1:1 ratio of latex polymer and fumed silica. The polymer-coated fluorescent lamp phosphor exhibits improved dispersability and wettability in aqueous and organic binder media which are used to apply fluorescent lamp phosphors to the inside walls of a fluorescent lamp envelope.

Abstract: A process for producing cerium activated yttrium gallium aluminate phosphor comprises dry blending yttrium oxide, gallium oxide, cerium oxide, and unmilled aluminum hydroxide wherein the aluminum hydroxide is a small particle size aluminum hydroxide wherein the 50% size as measured by Coulter Counter 2 minute stir technique using about a 100 micrometer aperture is about 10.8.+-.5 micrometers in diameter and by Coulter Counter 5 minute sonic technique using about a 100 micrometer aperture is about 9.3.+-.3 micrometers in diameter to form a uniform mixture thereof, and firing the mixture in air at a temperature of about 1550.degree. C. to about 1625.degree. C. for about 4 hours to 8 hours to produce a once-fired phosphor wherein the brightness is at least about 24% higher than phosphors produced using milled aluminum hydroxide that is large in particle size than the small size aluminum hydroxide. By refiring the phosphor, the brightness is further increased by at least about 14% over the once-fired phosphor.

Abstract: The powder weight of high powder weight SrB.sub.4 O.sub.7 :Eu phosphor is reduced by milling the phosphor, blending it with EuF.sub.3 and H.sub.3 BO.sub.3, firing the blend and then milling the blend in water containing Sr(OH).sub.2.8H.sub.2 O.

Abstract: A method is disclosed for producing a terbium activated cerium magnesium aluminate phosphor which comprises forming a uniform powder blend consisting essentially of in percent by weight from about 73 to about 74 aluminum oxide wherein the aluminum oxide can be alpha aluminum oxide or gamma aluminum oxide or combinations thereof, from about 12 to about 14 cerium oxide, from about 2 to about 3 magnesium, from about 0.3 to about 0.7 fluoride, and from about 6 to about 9 terbium, firing the blend in a non-oxidizing atmosphere at a temperature of from about 1500.degree. C. to about 1800.degree. C. for a sufficient time to produce the phosphor wherein the particle size is no greater than about 5 micrometers in diameter. The phosphor is then cooled and deagglomerated.