Gte Products Corporation

Sharon B Rutfield

Steven C Schlitt

Barry G DeBoer

An improved mercury vapor discharge lamp is disclosed. The lamp of the present invention includes an envelope and a selectively reflecting silicon dioxide layer on at least a portion of the inner surface of the envelope. The lamp further includes a phosphor coating disposed on the selectively reflecting layer. The silicon dioxide layer has a coating weight of from about 0.1 to about 4 mg/cm.sup.2. The selectively reflecting layer comprises at least about 80 weight percent silica having a primary particle size from about 5 to about 100 nm with at least about 50 weight percent of the silica having a primary particle size from about 17 to about 80 nm.

Silicon dioxide selectively reflecting layer for mercury vapor discharge

A fluorescent lamp designed to emit light in the red region of the visible spectrum suitable for reprographic applications. The lamp includes a colored envelope (e.g., amber) which is capable of attenuating light below about 500 nanometers. A layer containing a single narrow-band phosphor having a peak emission in the wavelength region of from about 590 to 660 nanometers is disposed on the inner surface of the envelope. The phosphor layer may consist of a mixture the narrow-band phosphor and a predetermined amount of alumina. Preferably, the alumina by weight is within the range of from about 55 percent to about 95 percent by weight of the phosphor.

Red fluorescent lamp suitable for reprographic applications

A fluorescent lamp suitable for backlighting a liquid crystal display includes a three-component phosphor disposed within the lamp envelope and responsive to the ultraviolet radiation generated by the plasma discharge in the lamp. The phosphor includes a first component having a first energy peak with a predetermined maximum intensity located within the wavelength range of from about 435 nanometers to 440 nanometers. A second component of the phosphor generates a second energy peak with a predetermined maximum intensity located within the wavelength range of from about 545 nanometers to 550 nanometers. A third component of the phosphor provides a third energy peak with a predetermined maximum intensity located within the wavelength range of from about 610 nanometers to 615 nanometers. The maximum intensity value of the first energy peak is within the range of from about 70% to 115% of the maximum intensity of the second energy peak. The maximum intensity value of the third energy peak is within the range of from about 65% to 87% of the maximum intensity of the second energy peak. The three energy peaks have bandwidths less than or equal to about 40 nanometers as measured at an intensity which is 50% of a respective maximum peak intensity. In one embodiment, the phosphor comprises a blend including about 42% to 44% by weight europium-activated strontium chlorophosphate, about 25% to 29% by weight cerium-terbium-activated magnesium aluminate and about 27% to 33% by weight europium-activated yttrium oxide.

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North Chelmsford, MA, United States of America

Sharon B Rutfield