Gte Laboratories Incorporated

Gte Products Corporation

Romano G Pappalardo

Thomas E Peters

Roger B Hunt, Jr

John Walsh

Charles F Chenot

William J Miniscalco

Leslie A Riseberg

Richard M Klein

William F Nelson

Karen Lee

Baldassare Di Bartolo

Alexandre Vetrovs

John Collins

A fluorescent lamp comprises at least one layer of a four-component phosphor blend for producing visible illumination having a white color. The quad-phosphor blend comprising a first and second red-emitting phosphor component with each red-emitting phosphor component having different visible emission spectrum principally in the 590 to 630 nm wavelength range. A third blue-emitting phosphor component has an emission spectrum principally in the 430 to 490 nm wavelength range. A fourth no-rare-earth green-emitting phosphor component has an emission spectrum principally in the 500 to 570 nm wavelength range. The relative proportions of the phosphor components are such that an enhanced color rendering index is produced as compared to tri-component blends formed from only three of the phosphor components.

Fluorescent lamp with improved phosphor blend

A fluorescent lamp comprises a plurality of metameric blends of lamp phosphors for converting ultraviolet radiation to visible illumination.

Fluorescent lamps with high color-rendering and high brightness

A fluorescent lamp has a coating on the interior surface of the glass envelope comprising an alkaline earth metal halophosphate phosphor and a quad-phosphor blend wherein the combination of phosphors result in a predetermined color point from about 2700 to about 4200 K on or near the Planckian locus where the alkaline earth metal halophosphate phosphor comprises a blend of halophosphate phosphors having a color temperature substantially matching the color temperature of the quad-blend which includes an europium activated aluminate as a phosphor component.

Fluorescent lamp with improved CRI and brightness

A host acting as an optical emitter and a process of making the same for the .sup..about. 1.3 .mu.m to .sup..about. 1.55 .mu.m spectral region utilized in optical communications is disclosed. The host is Cr-activated willemite (Zn.sub.2 SiO.sub.4). Efficient band-emission at room temperature, with peak at 1.42 .mu.m, is observed on exiting the material in the near infrared, typically at 730 nm and 829 nm.

Optical emitter for amplification and process for making same

The lumen maintenance of fluorescent lamps containing yttrium vanadate phosphors is markedly improved by the presence of a protective oxide layer for the phosphor. The protective oxide layer is produced by evaporating aluminum isopropoxide, in a vacuum, over phorphor particles forming a continuous aluminum isopropoxide over the phosphor particles. The isopropoxide coating is subsequently oxidized by lehring the phosphor at a temperature from about 500.degree. C. to 625.degree. C. forming an alumina coating on the phosphor particles.

Method of coating yttrium vanadate phosphors with Al.sub.2 O.sub.3

A fluorescent lamp containing a Y.sub.2 O.sub.3 or Al.sub.2 O.sub.3 coating on a layer of yttrium vanadate phosphor and a method of coating the layer of the yttrium vanadate phosphor with a continuous protective coating of Y.sub.2 O.sub.3 or Al.sub.2 O.sub.3 is described. The method comprises applying a coating of a metal, such as yttrium or aluminum, on the yttrium vanadate phosphor then lehring the metallic coating at about 500.degree. C. to about 625.degree. C. to form a continuous protective coating of Y.sub.2 O.sub.3 or Al.sub.2 O.sub.3 overlaying the layer of phosphor.

A method of coating a layer of an yttrium vanadate phosphor contained in

The present invention is directed to luminescent materials having the general formula:

Process for preparing high-brightness yellow-emitting triboluminescent

The present invention is directed to phosphors exhibiting efficient, narrow band UV emission, with peak emission at 330 nm (from excitation at 254). These phosphors are cerium-activated calcium pyrophosphate (beta-phase) of nominal formulation

Efficient UV-emitting phosphors based on cerium-activated calcium

An efficient green emitting phosphor results from the coactivation of yttrium fluoride with gadolinium and erbium. The excitation energy absorbed by the Gd.sup.3+ centers is transferred non-radiatively to minority Er.sup.3+ centers, whose emission produces green light when excited by 275 nanometer or 378 nanometer radiation.

Green emitting phosphor

Yellow emitting fluorescent lamp phosphor compositions comprise cerium and manganese activated alkali-earth fluoroapatite compositions containing sodium having the approximate formula

Process for producing Ce-Mn coactivated fluoroapatite phosphors as the

Yellow emitting fluorescent lamp phosphors comprise cerium and manganese activated calcium-strontium fluoroapatite compositions represented by the approximate formula

Process for producing a yellow emitting phosphor

Phosphors and a method for producing yellow-emitting tin-manganese coactivated calcium fluorophosphate phosphors having improved brightness comprises the steps of blending a powder mixture including the phosphates, carbonates, fluorides and oxides of calcium, tin, and manganese together with an ammonium salt, and firing the mixture at a temperature of between about 1100.degree. C. and about 1300.degree. C. for a period sufficient to produce a luminescent composition. The presence of an ammonium compound in the initial powder blend promotes the proper atmosphere during the firing step to insure the incorporation of proper levels of tin and manganese ions in the final phosphor.

Yellow-emitting halophosphate phosphor of improved brightness and method

A luminescent phosphor composition having enhanced luminescent decay lifetime consists essentially of a non-stoichiometric cerium and manganese coactivated alkaline earth orthophosphate represented by the formula

Red emitting phosphor with slow exponential decay

A luminescent phosphor composition having enhanced luminescent decay lifetime consists essentially of a non-stoichiometric tin and manganese coactivated alkaline earth orthophosphate represented by the formula

Phosphor with extended fluorescence decay lifetime and lamp based thereon

A luminescent glass comprising a host material consisting essentially of 25 to 36 mole percent Al.sub.2 O.sub.3, the balance P.sub.2 O.sub.5, and which is doped with cerium and terbium. The glass is an efficient emitter of visible radiation, predominantly green, when excited by ultraviolet radiation.

Growing community of inventors

Sudbury, MA, United States of America

Romano G Pappalardo