Gte Products Corporation

Wolfgang Walter

Charles F Chenot

Vincent Chiola, Executrix

Robert E Taylor, Deceased

Calcium fluorophosphate phosphor co-activated by specific levels of antimony and manganese emits in a narrow portion of the yellow region of the spectrum making such phosphor useful in fluorescent lamps. Furthermore, when blended in specific proportions with a blue-emitting divalent europium activated strontium halophosphate, and incorporated into a fluorescent lamp, the resultant lamp gives an increased lumen per watt output over a 'cool white' lamp incorporating a standard 'cool white' calcium halophosphate phosphor.

Lamp incorporating phosphor blend of calcium fluorophosphate and

A fluorescent lamps having colors similar to standard daylight can be prepared using two component compositions. A blue emitting phosphor having a peak emission with a specified range and a 50% band width within a specified range along with specific amounts of a yellow-emitting phosphor having a 50% band width within a specified range and a peak emission within a specified range provide a daylight lamp with a higher lumer per watt than the standard daylight lamp.

Daylight fluorescent lamps employing blend

A fluorescent lamps having colors similar to standard white can be prepared using two phosphor compositions. A blue emitting phosphor having a peak emission with a specified range and a 50% band width within a specified range is used with specific amounts of a yellow-emitting phosphor having a 50% band width within a specified range and a peak emission within a specified range provide a lamp having the same chromaticity as a standard white lamp with a higher lumer per watt than the standard white lamp. In one embodiment the blue emitting component has a second specific peak emission and a specific 50% bandwidth.

Standard white fluorescent lamps employing blend

A fluorescent lamp having a high color rendering index and high efficacy comprises a glass envelope having electrodes at its ends and contains a fill including mercury and a starting gas, and a phosphor coating on the inner surface of the glass envelope, the phosphor coating comprising a blend of four narrow band emitting phosphors.

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Brookline, MA, United States of America

Wolfgang Walter