Patent ID: 8686625
Filing Date: 2014-04-01
Classification: H01L

Abstract:
1. A light-emitting device comprising: a 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; and at least partially surrounding the light-emitting die, a phosphor element comprising (i) a binder and (ii) disposed within the binder, one or more wavelength-conversion materials for absorbing at least a portion of light emitted from the light-emitting die and emitting converted light having a different wavelength, converted light combining with unconverted light emitted from the light-emitting die to form substantially white light, and a divergence of color temperature of the substantially white light emitted from the device varies, over an angular range of 0° to 85°, no more than 0.01 in terms of Δu′v′ deviation from a spatially weighted averaged chromaticity, wherein the phosphor element has an outer contour having (i) a curved region that defines only a portion of a hemisphere having a hemisphere radius, (ii) a planar region (a) disposed over the light-emitting die, (b) having a non-zero z-offset within the hemisphere, and (c) substantially parallel to the top face of the light-emitting die, a ratio of the z-offset of the planar region within the hemisphere to the hemisphere radius having a value ranging from 0.02 to 0.15, and (iii) a base opposite the planar region having a non-zero centroid z-offset within the hemisphere, a ratio of the centroid z-offset to the hemisphere radius having a value ranging from 0.3 to 0.8.