Engineered-phosphor LED packages and related methods
First Claim
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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 Δ
u′
v′
deviation from a spatially weighted averaged chromaticity, and u′ and
v′
are chromaticity coordinates on a chromaticity diagram.
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Accused Products
Abstract
In accordance with certain embodiments, regions of spatially varying wavelength-conversion particle concentration are formed over light-emitting dies.
74 Citations
28 Claims
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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:
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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 Δ
u′
v′
deviation from a spatially weighted averaged chromaticity, and u′ and
v′
are chromaticity coordinates on a chromaticity diagram. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification