Patent ID: 8847261

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, wherein (i) the phosphor element has an outer contour having a curved region that defines only a portion of a hemisphere having a hemisphere radius, and (ii) a base of the phosphor element, opposite the curved region, has a positive, non-zero centroid z-offset within the hemisphere, 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 the base of the phosphor element, (iii) the base faces the centroid, (iv) at least a portion of the base is perpendicular to the z-axis, (v) the centroid z-offset is the distance from the centroid to the base along the z-axis, and (vi) 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.