Engineered-phosphor LED packages and related methods
First Claim
Patent Images
1. 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;
a binder having top and bottom surfaces, at least one of which is substantially parallel to the top face of the die, wherein at least a portion of the binder is disposed over the top face of the light-emitting die; and
disposed within the binder, 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, wherein (i) converted light and unconverted light emitted by the light-emitting die combine to form substantially white light, (ii) 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 (iii) u′ and
v′
are chromaticity coordinates on a chromaticity diagram,wherein (i) the plurality of wavelength-conversion particles comprises 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, (ii) throughout the binder, a concentration of the first plurality of wavelength-conversion particles relative to a total concentration of wavelength-conversion particles is within 20% of a concentration of the second plurality of wavelength-conversion particles relative to the total concentration of wavelength-conversion particles, (iii) the total concentration of the wavelength-conversion particles varies in a direction substantially perpendicular to at least one of the top or bottom faces without varying radially toward or away from the light-emitting die, (iv) the first type of wavelength-conversion particle has a first density, and (v) the second type of wavelength-conversion particle has a second density different from the first density.
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Abstract
In accordance with certain embodiments, regions of spatially varying wavelength-conversion particle concentration are formed over light-emitting dies.
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Citations
29 Claims
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1. A light-emitting device comprising:
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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; a binder having top and bottom surfaces, at least one of which is substantially parallel to the top face of the die, wherein at least a portion of the binder is disposed over the top face of the light-emitting die; and disposed within the binder, 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, wherein (i) converted light and unconverted light emitted by the light-emitting die combine to form substantially white light, (ii) 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 (iii) u′ and
v′
are chromaticity coordinates on a chromaticity diagram,wherein (i) the plurality of wavelength-conversion particles comprises 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, (ii) throughout the binder, a concentration of the first plurality of wavelength-conversion particles relative to a total concentration of wavelength-conversion particles is within 20% of a concentration of the second plurality of wavelength-conversion particles relative to the total concentration of wavelength-conversion particles, (iii) the total concentration of the wavelength-conversion particles varies in a direction substantially perpendicular to at least one of the top or bottom faces without varying radially toward or away from the light-emitting die, (iv) the first type of wavelength-conversion particle has a first density, and (v) the second type of wavelength-conversion particle has a second density different from the first density. - 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, 29)
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Specification