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US 8,415,869 B1Granted
Fluorescent lamp with underlying yttrium vanadate phosphor layer and protective phosphor layer
AssigneeGeneral Electric Company
InventorsWilliam Erwin Cohen, Jianmin He
Life of this patent
Estimating the term…
Abstract
A fluorescent lamp includes a glass envelope that is light transmitting. There is means for providing a discharge inside the envelope. A discharge-sustaining fill of mercury and an inert gas is sealed inside the envelope. An underlying phosphor-containing layer is disposed inside the envelope. The underlying layer includes yttrium vanadate 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.
Claims25
A fluorescent lamp comprising:
- a glass envelope that is light transmitting;
- means for providing a discharge inside said envelope;
- a discharge-sustaining fill of mercury and an inert gas sealed inside said envelope;
- an underlying phosphor-containing layer disposed inside said envelope, said underlying layer comprising yttrium vanadate phosphor;
- and
- a protective phosphor-containing layer disposed as a separate coating over said underlying layer at a location that is more distal from said glass than said underlying layer, wherein said protective phosphor-containing layer does not include yttrium vanadate phosphor.
3 more elements
A fluorescent lamp comprising:
- a glass envelope that is light transmitting;
- electrodes spaced apart in said envelope for providing a discharge inside said envelope;
- a discharge-sustaining fill of mercury and an inert gas sealed inside said envelope;
- an underlying phosphor-containing layer disposed inside said envelope, said underlying layer comprising at least one of yttrium vanadate activated with europium and yttrium vanadate phosphate activated with europium and/or other activator;
- and
- a protective phosphor-containing layer disposed as a separate coating over said underlying layer at a location that is more distal from said glass than said underlying layer wherein said protective phosphor-containing layer does not include yttrium vanadate phosphor.
3 more elements
A fluorescent lamp comprising:
- a glass envelope that is light transmitting;
- electrodes spaced apart in said envelope for providing a discharge inside said envelope;
- a discharge-sustaining fill sealed inside said envelope;
- an underlying phosphor-containing layer disposed inside said envelope, said underlying layer comprising at least one of yttrium vanadate activated with europium and yttrium vanadate phosphate activated with europium and/or other activator;
- and
- a protective phosphor-containing layer disposed as a separate coating over said underlying layer at a location that is more distal from said glass than said underlying layer, wherein said protective phosphor-containing layer does not include yttrium vanadate phosphor.
3 more elements
Dependencies are inferred from the claim text.