Package Design for Producing White Light With Short-Wavelength Leds and Down-Conversion Materials
First Claim
1. A method of producing visible light having a chromaticity value near a blackbody locus and a color rendering index greater than about 80, the visible light produced using a short wavelength solid state light emitting device, a quantum dot material and a phosphor material, the method comprising:
- a) generating short wavelength light having a first spectrum with a first peak wavelength using the short wavelength solid state light emitting device, the first peak wavelength being shorter than about 500 nm;
b) irradiating the quantum dot material with at least a portion of the short wavelength light such that a first fraction of the short wavelength light is absorbed and reemitted by the quantum dot material as long wavelength light having a second spectrum with a second peak wavelength, the second peak wavelength being longer than about 600 nm;
C) irradiating the phosphor material with at least a portion of the short wavelength light such that a second fraction of the short wavelength light is absorbed and reemitted by the phosphor material as mid wavelength light having a third spectrum with a third peak wavelength, the third peak wavelength being between the first peak wavelength and the second peak wavelength; and
d) emitting a third fraction of the short wavelength light, at least a portion of the mid wavelength light, and at least a portion of the long wavelength light as the visible light.
1 Assignment
0 Petitions
Accused Products
Abstract
A broad bandwidth light source including: a solid state light emitting device that generates short wavelength light; and quantum dot material and phosphor material that are each irradiated by some of the short wavelength light. The short wavelength light has a spectrum with a first peak wavelength shorter than about 500 nm. The quantum dot material absorbs some of the short wavelength light and reemits it as long wavelength light having a spectrum with a second peak wavelength longer than about 600 nm. The phosphor material absorbs some of the short wavelength light and reemits it as mid wavelength light having a spectrum with a peak wavelength between the first and second peak wavelength. The light source is configured such that some of each light (short, mid, and long wavelength) is emitted coincidently as a light having a chromaticity value near the blackbody locus and a color rendering index greater than 80.
178 Citations
36 Claims
-
1. A method of producing visible light having a chromaticity value near a blackbody locus and a color rendering index greater than about 80, the visible light produced using a short wavelength solid state light emitting device, a quantum dot material and a phosphor material, the method comprising:
-
a) generating short wavelength light having a first spectrum with a first peak wavelength using the short wavelength solid state light emitting device, the first peak wavelength being shorter than about 500 nm; b) irradiating the quantum dot material with at least a portion of the short wavelength light such that a first fraction of the short wavelength light is absorbed and reemitted by the quantum dot material as long wavelength light having a second spectrum with a second peak wavelength, the second peak wavelength being longer than about 600 nm; C) irradiating the phosphor material with at least a portion of the short wavelength light such that a second fraction of the short wavelength light is absorbed and reemitted by the phosphor material as mid wavelength light having a third spectrum with a third peak wavelength, the third peak wavelength being between the first peak wavelength and the second peak wavelength; and d) emitting a third fraction of the short wavelength light, at least a portion of the mid wavelength light, and at least a portion of the long wavelength light as the visible light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 33)
-
-
13. A broad bandwidth light source comprising:
-
a short wavelength solid state light emitting device to generate short wavelength light having a first spectrum with a first peak wavelength, the first peak wavelength being shorter than about 500 nm; a quantum dot material optically coupled to the short wavelength solid state light emitting device to be irradiated by a first portion of the short wavelength light, the quantum dot material adapted to absorb a first fraction of incident light having the first spectrum and to reemit the absorbed light as long wavelength light having a second spectrum with a second peak wavelength, the second peak wavelength being longer than about 600 nm; and a phosphor material optically coupled to the short wavelength solid state light emitting device to be irradiated by a second portion of the short wavelength light, the phosphor material adapted to absorb a second fraction of incident light having the first spectrum and to reemit the absorbed light as mid wavelength light having a third spectrum with a third peak wavelength, the third peak wavelength being between the first peak wavelength and the second peak wavelength, wherein the short wavelength solid state light emitting device, the quantum dot material, and the phosphor material are configured such that a first amount of the short wavelength light, a second amount of the long wavelength light, and a third amount of the mid wavelength light are emitted substantially coincidently from the broad bandwidth light source as a visible light having a chromaticity value near a blackbody locus and a color rendering index greater than 80. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 34, 35)
-
-
36. A broad bandwidth light source for producing visible light having a chromaticity value near a blackbody locus and a color rendering index greater than about 80, the broad bandwidth light source comprising:
-
means for generating short wavelength light having a first spectrum with a first peak wavelength, the first peak wavelength being shorter than about 500 nm; means for absorbing and reemitting a first fraction of the short wavelength light as long wavelength light having a second spectrum with a second peak wavelength, the second peak wavelength being longer than about 600 nm; and means for absorbing and reemitting a second fraction of the short wavelength light as mid wavelength light having a third spectrum with a third peak wavelength, the third peak wavelength being between the first peak wavelength and the second peak wavelength, wherein a third fraction of the short wavelength light, at least a portion of the mid wavelength light, and at least a portion of the long wavelength light are emitted as the visible light.
-
Specification