Lamp incorporating phosphor blend of calcium fluorophosphate and strontium halophosphate
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United States of America Patent
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Oct 6, 1987
Issued Date -
N/A
app pub date -
Mar 5, 1987
filing date -
Oct 15, 1985
priority date (Note) -
Expired
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Abstract
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.
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