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US 2013/0075774 A1Published application
Light Converting And Emitting Device With Minimal Edge Recombination
Assignee3M Innovative Properties Company
InventorsMichael A. Haase, Junqing Xie, Thomas J. Miller, Terry L. Smith
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Abstract
Light emitting system (100), particularly, light emitting systems that utilize semiconductor wavelength converting regions (104), and methods of producing such systems are disclosed. The light emitting systems and methods of producing such systems seek to frustrate recombination of free carriers that are associated with wavelength converting regions.
Claims35
A light emitting system, comprising:
- an electroluminescent device that emits a pump light of a first wavelength from an emission surface;
- at least one first semiconductor light converting construction that absorbs the pump light and emits light of a second wavelength, the semiconductor light converting construction comprising an edge;
- a non-light-converting area that does not convert the pump light into light of a different wavelength, wherein a first portion of the pump light impinges the first semiconductor light converting construction and a second portion of the pump light travels through the non-light-converting area;
- and
- a light-blocking structure positioned between the emission surface of the electroluminescent device and the first semiconductor light converting construction, such that the edge of the first light converting semiconductor construction is positioned over the light blocking structure.
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A method of making a light emitting system, comprising the steps of:
- providing an LED having an emission surface and a plurality of electrodes on the emission surface;
- disposing a semiconductor wavelength converter layer onto the plurality of electrodes and the emission surface of the LED;
- and
- removing a portion of the wavelength converter layer to create an edge of the wavelength converter layer and expose at least a portion of an electrode in the plurality of electrodes, such that the at least partially exposed electrode inhibits light from the emission surface of the LED from reaching the edge of the wavelength converter layer.
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Dependencies are inferred from the claim text.