Patent ID: 9142738
Filing Date: 2015-09-22
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 faces being configured for emission of light therefrom, and (ii) a sidewall spanning the top and bottom faces, the method comprising: applying over at least the top face of the light-emitting die (i) a binder and (ii) 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, the plurality of wavelength-conversion particles comprising a first plurality of wavelength-conversion particles of a first type and a second plurality of wavelength-conversion particles of a second type different from the first type; applying a settling force to the wavelength-conversion particles, whereby each of the first and second plurality of wavelength-conversion particles form a predetermined concentration gradient of wavelength-conversion particles in at least a portion of the binder; and at least partially curing the binder to fix the predetermined concentration gradient of wavelength-conversion particles in the at least a portion of the binder to result in a divergence of color temperature of the substantially white light emitted from the light-emitting device varying, 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, where u′ and v′ are chromaticity coordinates on a chromaticity diagram.