Patent ID: 8766527

Claim:
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 10° 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, and (ii) a base opposite the curved 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, and wherein (i) the centroid is located at the center of an imaginary sphere having the same radius and center as the hemisphere, (ii) the z-axis is centered at the centroid and extends in a positive z-axis direction toward a base surface of the base, (iii) the base surface faces the centroid, (iv) at least a portion of the base surface is perpendicular to the z-axis, and (v) the centroid z-offset is the distance from the centroid to the base surface along the z-axis.