Fluorescent lamp with zinc silicate phosphor and protective phosphor layer
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United States of America Patent
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May 21, 2013
Grant Date -
Mar 28, 2013
app pub date -
Sep 23, 2011
filing date -
Sep 23, 2011
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A fluorescent lamp comprises a glass envelope that is light transmitting. Also included is means for providing a discharge inside the envelope. A discharge-sustaining fill includes mercury and an inert gas sealed inside the envelope. An underlying phosphor-containing layer is disposed inside the envelope. The underlying layer includes zinc silicate phosphor. A protective phosphor-containing layer is disposed over the underlying layer at a location that is more distal from the glass than the underlying layer. A ratio of a surface density of the protective layer to a surface density of the underlying layer is at least 0.4:1.
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