Encapsulation for phosphor-converted white light emitting diode
First Claim
Patent Images
1. A light emitting diode (LED) device, comprising:
- an LED chip on a mount surface;
a conversion layer on said LED chip, said conversion layer comprising a binder material and a plurality of phosphor particles throughout said binder material;
a plurality of nanoparticles throughout said binder material such that the effective refractive index of a combination of said binder material and said nanoparticles is between the refractive index of said phosphor particles and the refractive index of a surrounding medium; and
a light scattering layer on said conversion layer and in contact with said mount surface, said light scattering layer comprising a plurality of light scattering particles throughout said surrounding medium, the refractive index of said light scattering particles being greater or less than the refractive index of said surrounding medium, wherein light conversion only takes place in the conversion layer.
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Abstract
An improved light emitting device, especially a phosphor-converted white light device, wherein the light extraction efficiency and the color temperature distribution uniformity are improved by the introduction of both nanoparticles and light scattering particles proximate to the light source. Nanoparticles having a high index of refraction are dispersed throughout a wavelength conversion layer to adjust the index of refraction of the layer for improved light extraction. Light scattering particles may be dispersed in the wavelength conversion layer and/or in a surrounding medium to improve the spatial correlated color temperature uniformity.
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Citations
58 Claims
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1. A light emitting diode (LED) device, comprising:
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an LED chip on a mount surface; a conversion layer on said LED chip, said conversion layer comprising a binder material and a plurality of phosphor particles throughout said binder material; a plurality of nanoparticles throughout said binder material such that the effective refractive index of a combination of said binder material and said nanoparticles is between the refractive index of said phosphor particles and the refractive index of a surrounding medium; and a light scattering layer on said conversion layer and in contact with said mount surface, said light scattering layer comprising a plurality of light scattering particles throughout said surrounding medium, the refractive index of said light scattering particles being greater or less than the refractive index of said surrounding medium, wherein light conversion only takes place in the conversion layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A light emitting diode (LED) device, comprising:
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an LED chip on a mount surface, said LED chip comprising a textured primary emission surface; a wavelength conversion layer comprising a flat primary emission surface on said LED chip, wherein light conversion only takes place within said wavelength conversion layer, said conversion layer comprising; a binder material comprising a first refractive index; a plurality of phosphor particles throughout said binder material; a plurality of nanoparticles throughout said binder material such that the effective refractive index of a combination of said binder material and said nanoparticles is between the refractive index of said phosphor particles and the refractive index of a surrounding medium; and an encapsulant over said wavelength conversion material and in contact with said mount surface, said encapsulant comprising a plurality of light scattering particles throughout said surrounding medium, the refractive index of said light scattering particles being greater or less than the refractive index of said surrounding medium. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. A light emitting diode (LED) device, comprising:
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an LED chip on a mount surface, said LED chip comprising a textured primary emission surface; a wavelength conversion layer on said LED chip, wherein said light conversion only takes place within said wavelength conversion layer, said conversion layer comprising; a binder material comprising a first refractive index; a plurality of phosphor particles throughout said binder material, wherein said plurality of phosphor particles comprises a mixture of phosphor particles comprising a diameter of less than approximately 10 nanometers and phosphor particles comprising a diameter greater than approximately 10 micrometers; and a spacer layer interposed between said textured primary emission surface and said conversion layer, wherein said spacer layer has an index of refraction less than said conversion layer and said LED chip, wherein said spacer layer is conformal to said LED chip and wherein said wavelength conversion material is conformal to said spacer layer; and an encapsulant over said LED chip and in contact with said mount surface comprising a plurality of light scattering particles throughout said encapsulant, the refractive index of said light scattering particles being greater or less than the refractive index of said encapsulant. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47, 48, 49)
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50. A light emitting diode (LED) device, comprising:
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an LED chip on a mount surface; a conversion layer on said LED chip, said conversion layer comprising a binder material and a plurality of phosphor particles throughout said binder material, wherein light conversion only takes place within said conversion layer; a plurality of nanoparticles throughout said binder material such that the effective refractive index of a combination of said binder material and said nanoparticles is increased; and an encapsulant over said conversion layer and in contact with said mount surface, said encapsulant comprising a plurality of light scattering particles throughout said encapsulant, the refractive index of said light scattering particles being greater or less than the refractive index of said encapsulant; wherein said effective refractive index is between the refractive index of said phosphor particles and the refractive index of said encapsulant. - View Dependent Claims (51, 52, 53, 54, 55, 56, 57, 58)
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Specification