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US 6,686,581 B2Granted
Light emitting device including an electroconductive layer
AssigneeLumileds Lighting U.S., LLC
InventorsGodefridus Johannes Verhoeckx, Nicolaas Joseph Martin Van Leth, Cornelis Gerardus Visser
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Abstract
A LED is covered with an electroconductive layer, and a luminescent layer is deposited on the electroconductive layer by electrophoresis. The conductivity of the electroconductive layer is chosen to be such that the layer can be used as one of the electrodes during the electrophoresis, while the LED is not short-circuited by the electroconductive layer during normal operation.
Claims35
An optoelectric element, comprising:
- a semiconductor light emitting device;
- an electroconductive layer covering at least a portion of said light emitting device;
- and
- a luminescent layer overlying and adjacent to said electroconductive layer, said luminescent layer for converting any electromagnetic radiation of a first wavelength range generated by said semiconductor light emitting device into a visible light of a different wavelength range;
- wherein the electroconductive layer has an electrical conductivity that limits an amount of current flowing through said electroconductive layer to less than 5% of any current flowing through said light emitting device.
2 more elements
A method for covering an optoelectric element with a luminescent layer, said method comprising:
- providing a semiconductor light emitting device;
- covering a surface of said semiconductor light emitting device with an electroconductive layer, an electric conductivity of said electroconductive layer being lower than an electric conductivity of said semiconductor light emitting device;
- bringing the electronconductive layer in contact with a suspension of luminescent material;
- and
- applying a voltage across the electroconductive layer and the suspension to deposit a layer of luminescent material on the electroconductive layer by an electrophoresis on the surface of the electroconductive layer, wherein the electric conductivity of said electronconductive layer is higher than an electric conductivity of the suspension of luminescent material.
2 more elements
An optoelectric element, comprising:
- a semiconductor light emitting device having a first surface, a second surface substantially parallel to said first surface, and a third surface connecting at least a portion of said first surface to a portion of said second surface;
- an electroconductive layer covering at least a portion of said first and third surfaces of the light emitting device;
- and
- a luminescent layer overlying said electroconductive layer, said luminescent layer for converting any electromagnetic radiation of a first wavelength range generated by said semiconductor body into a visible light of a different wavelength range.
1 more element
Dependencies are inferred from the claim text.