Led-based white-emitting illumination unit
AssigneesPatent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH, Osram Opto Semiconductors GmbH & Co. OHG
InventorsAndries Ellens, Frank Jermann, Franz Kummer, Michael Ostertag, Franz Zwaschka
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Abstract
A white-emitting luminescence conversion LED uses a chlorosilicate phosphor which, in addition to Ca and Mg, contains a europium doping, and also a garnet phosphor of the rare earths, in particular Y and/or Tb. In this way, it is possible to achieve a high color rendering and a high constancy of the lighting properties under differing temperature conditions.
Claims10
A white-emitting illumination unit, having at least one LED as light source, the LED emitting primary radiation in the 300 to 470 nm region, this radiation being partially or completely converted into longer-wave radiation by phosphors which are exposed to the primary radiation of the LED, characterized in that the conversion takes place at least with the aid of a green-emitting phosphor which originates from the class of the Eu-activated calcium magnesium chlorosilicates and of at least one yellow-emitting phosphor which originates from the class of the Ce-activated rare earth garnets.
Dependencies are inferred from the claim text.