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 method of making a lanthanum cerium terbium phosphate phosphor involves the coprecipitation of a rare earth nitrate solution with diammonium hydrogen phosphate to form a lanthanmum cerium terbium phosphate, combining the phosphate with a fluxing compound, and firing the resulting mixture to form the phosphor.

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.

Abstract: A manganese-activated zinc silicate phosphor contains a small amount of tungsten dispersed throughout the phosphor matrix. The tungsten improves maintenance of a fluorescent lamp in which the phosphor is used.

Abstract: A fluorescent lamp has a phosphor coating on the interior surface of the lamp envelope. Dispersed throughout the coating is a melted and solidified amorphous borate-phosphate frit to improve the adhesion of the phosphor.

Abstract: A continuous process for manufacture of brushite, CaHPO.sub.4.2H.sub.2 O, is disclosed. Calcium and phosphate ions are mixed in a container to produce brushite precipitate, which is then continuously introduced into second and third containers where the pH is raised to reduce brushite solubility. The brushite is then filtered in a continuous process, washed, refiltered, and rewashed before being converted to anhydrous calcium hydrogen phosphate.

Abstract: A frit material that improves the adhesion of phosphor coatings in fluorescent lamps has the general composition (Ca,Ba)O.B.sub.2 O.sub.3.P.sub.2 O.sub.5.

Abstract: New phosphors which may be activated to luminesce in the red to green portion of the spectrum have an alpha crystal structure isostructural with Ba.sub.2 MnS.sub.3 and the compositionBa.sub.2 Zn.sub.1.sub.-y Cd.sub.y S.sub.3 : A.sub.w.sup.. zZnSwherein A is an activator element selected from the group consisting of manganese, europium, cerium, lead and terbium, y is a numerical value in the range from 0 to 1, z is a numerical value in the range from 0 to 20, and w is a numerical value in the range from 0.00001 to 0.1. Methods of making these phosphors are described.