LED-based white-emitting illumination unit
AssigneesPatent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH, OSRAM Opto Semiconductors GmbH
InventorsAndries Ellens, Frank Jermann, Michael Ostertag
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Abstract
The inventive white-light emitting luminescent conversion LED uses a chlorosilicate luminous substance which is doped with europium in addition to containing Ca and Mg and a garnet rare-earth substance, especially Y and/or Tb. This results in high quality colour reproduction and highly constant lighting properties at various temperatures.
Claims3
A chlorosilicate phosphor which is doped with Europium (Eu), wherein said phosphor uses small quantities of manganese (Mn) as additional dopant, satisfying the empirical formula Ca8−x−yEuxMnyMg(SiO4)4Cl2, wherein the proportion of Eu is between x=0.005 and x=1.6 and wherein the proportion of Mn is up to approximately 20% of the molar proportion of Eu and is at most y=0.1.
Dependencies are inferred from the claim text.