Ce,Pr-coactivated calcium pyrophosphate phosphor and lamp containing same
AssigneeOsram Sylvania Inc.
InventorsGregory A. Marking, Thomas M. Synder
Life of this patent
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Abstract
A UV-emitting, Ce,Pr-coactivated calcium pyrophosphate phosphor is provided wherein the Pr activator increases the phosphor's sensitivity to excitation by 185 nm radiation. The improved sensitivity to the 185 nm radiation allows the phosphor to make better use of the approximate 10% of the UV radiation that is emitted at 185 nm by a low pressure mercury discharge.
Claims21
A UV-emitting phosphor comprising calcium pyrophosphate activated with cerium and praseodymium.
A lamp comprising a glass envelope having a phosphor coating on an interior surface, the phosphor coating containing a UV-emitting phosphor comprising calcium pyrophosphate activated with cerium and praseodymium.
A lamp comprising a glass envelope having a phosphor coating on an interior surface, the envelope being hermetically sealed and containing an amount of mercury and an inert gas, and the phosphor coating containing a UV-emitting Ca2P2O7:Ce,Pr phosphor.
Dependencies are inferred from the claim text.