Light emitting device with phosphor wavelength conversion

F - Mech Eng,Light,Heat,Weapons – 21 – K

Patent

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Details

F21K 99/00 (2010.01) F21K 2/00 (2006.01) F21V 9/08 (2006.01) F21V 9/16 (2006.01) H01L 33/00 (2010.01)

Patent

CA 2702436

A light emitting device comprises an excitation source, one or more light emitting diode(s) operable to generate excitation light of a first wavelength range and a light emitting surface having a phosphor material which absorbs at least a part of the excitation light and emits light of a second wavelength range, wherein light emitted by the device comprises combined light of the first and second wavelength ranges emitted by the light emitting surface. The device is characterized by the light emitting surface having one or more window areas which does not include a phosphor material and which are substantially transparent to light of the first and second wavelengths. The light emitting surface can comprise a transparent substrate having a pattern of phosphor material on a surface thereof with the one or more window areas evenly distributed over the light emitting surface.

La présente invention concerne un dispositif électroluminescent comprenant une source d'excitation, une ou plusieurs diodes électroluminescentes fonctionnant pour générer une lumière d'excitation d'une première plage de longueurs d'onde et une surface électroluminescente possédant un matériau luminophore qui absorbe au moins une partie de la lumière d'excitation et émet une lumière d'une seconde plage de longueurs d'onde, la lumière émise par le dispositif comprenant la lumière combinée des première et seconde plages de longueurs d'onde émise par la surface électroluminescente. Le dispositif est caractérisé par la surface électroluminescente qui a une ou plusieurs zones de fenêtre qui n'incluent pas de matériau luminophore et sont substantiellement transparentes à la lumière des première et seconde longueurs d'onde. La surface électroluminescente peut comporter un substrat transparent ayant un motif de matériau luminophore sur sa surface, une ou plusieurs zones de fenêtre étant réparties de manière égale sur la surface électroluminescente.

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