High CRI Electroluminescent Lamp
AssigneeOsram Sylvania Inc.
InventorChung-nin Chau
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Abstract
An electroluminescent lamp having a high color rendering index (CRI) can be made using a phosphor blend comprising a mixture of an electroluminescent phosphor and an europium-activated alkaline earth silicon nitride phosphor, wherein the electroluminescent phosphor is selected from a blue-emitting electroluminescent phosphor, a blue-green-emitting electroluminescent phosphor, or a combination thereof. Preferably, the lamp exhibits a CRI of at least about 75, and, more preferably, at least about 80. A preferred blend contains from about 10% to about 20% by weight of the europium-activated alkaline earth silicon nitride phosphor.
Claims28
An electroluminescent lamp including a phosphor blend comprised of a mixture of an electroluminescent phosphor and an europium-activated alkaline earth silicon nitride phosphor, the electroluminescent phosphor selected from a blue-emitting electroluminescent phosphor, a blue-green-emitting electroluminescent phosphor, or a combination thereof.
A phosphor blend comprising:
- a mixture of an electroluminescent phosphor and an europium-activated alkaline earth silicon nitride phosphor, the electroluminescent phosphor selected from a blue-emitting electroluminescent phosphor, a blue-green-emitting electroluminescent phosphor, or a combination thereof.
A phosphor blend comprising:
- a mixture of an electroluminescent phosphor and a Ca2Si5N8:Eu phosphor, the electroluminescent phosphor selected from a blue-emitting ZnS:Cu phosphor, a blue-green-emitting ZnS:Cu,Cl phosphor, or a combination thereof.
Dependencies are inferred from the claim text.