MULTI-LAYER CONVERSION MATERIAL FOR DOWN CONVERSION IN SOLID STATE LIGHTING

摘要

Light emitting diodes are disclosed that utilize multiple conversion materials in the conversion process in order to achieve the desired emission color point. Different embodiments of the present invention can comprise different phosphor types in separate layers on, above or around one or a plurality of LED chips to achieve the desired light conversion. The LEDs can then emit a desired combination of light from the LED chips and conversion material. In some embodiments, conversion materials can be applied as layers of different phosphor types in order of longest emission wavelength phosphor first, followed by shorter emission phosphors in sequence as opposed to applying in a homogeneously mixed phosphor converter. The conversion material layers can be applied as a blanket over the LED chips and the area surrounding the chip, such as the surface of a submount holding the LED chips.

主权项

1. An LED, comprising:
one or more of LED chips on a surface of a submount; a conversion material layer comprising two or more layers of different conversion materials, said conversion material layer covering said one or more LED chips and at least a portion of said submount around said LED chips; and an encapsulant over said LED chips and said submount.