White LED utilizing organic dyes

Abstract

A light source having a light emitting semiconductor device on a die and a light conversion layer is disclosed. The die emits light of a first wavelength. The light conversion layer overlies the die and includes a first soluble fluorescent dye and a second fluorescent dye in a solid clear plastic carrier. The first and second florescent dyes convert the light entering the conversion layer to light of second and third wavelengths, respectively. At least one of the first and second dyes is excited by light of the first wavelength. In one embodiment, the second and third wavelengths are present in a ratio of intensities such that the light leaving the light conversion layer is perceived as white light by a human observer. The light conversion layer may be divided into sub-layers that include the individual dyes.

Dependencies are inferred from the claim text.