Patent ID: 8722439
Filing Date: 2014-05-13
Classification: H01L

Abstract:
1. A method of fabricating a light-emitting device comprising a bare light-emitting die having (i) a top face and a bottom face opposite the top face, at least one of the top or bottom face being configured for emission of light therefrom, and (ii) a sidewall spanning the top and bottom faces, the method comprising: applying a polymeric binder over at least the top face of the light-emitting die, the polymeric binder (i) having top and bottom surfaces, at least one of which is substantially parallel to the top face of the light-emitting die, (ii) comprising a portion extending laterally beyond the sidewall of the light-emitting die, (iii) comprising a portion extending proximate the sidewall of the light-emitting die below a plane defined by the top face of the light-emitting die, and (iii) having, disposed therewithin, a plurality of wavelength-conversion particles for absorbing at least a portion of light emitted from the light-emitting die and emitting converted light having a different wavelength, converted light and unconverted light emitted by the light-emitting die combining to form substantially white light; applying a settling force to the wavelength-conversion particles, whereby the wavelength-conversion particles form a predetermined concentration gradient of wavelength-conversion particles in at least a portion of the polymeric binder; and at least partially curing the polymeric binder to fix the predetermined concentration gradient of wavelength-conversion particles in the at least a portion of the polymeric binder, wherein a divergence of color temperature of the substantially white light emitted from the light-emitting device varies, over an angular range of 0° to 70°, no more than 0.01 in terms of a Δu′v′ deviation from a spatially weighted averaged chromaticity, and u′ and v′ are chromaticity coordinates on a chromaticity diagram.