Quantum dot white and colored light emitting diodes
First Claim
1. An electronic device comprising:
- a solid-state device which serves as a primary light source; and
a population of photoluminescent quantum dots dispersed in a host matrix, at least a portion of the quantum dots having a band gap energy smaller than the energy of at least a portion of the light produced by the source, and the matrix allowing light from the source to pass therethrough.
9 Assignments
1 Petition
Accused Products
Abstract
An electronic device comprising a population of quantum dots embedded in a host matrix and a primary light source which causes the dots to emit secondary light of a selected color, and a method of making such a device. The size distribution of the quantum dots is chosen to allow light of a particular color to be emitted therefrom. The light emitted from the device may be of either a pure (monochromatic) color, or a mixed (polychromatic) color, and may consist solely of light emitted from the dots themselves, or of a mixture of light emitted from the dots and light emitted from the primary source. The dots desirably are composed of an undoped semiconductor such as CdSe, and may optionally be overcoated to increase photoluminescence.
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Citations
29 Claims
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1. An electronic device comprising:
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a solid-state device which serves as a primary light source; and
a population of photoluminescent quantum dots dispersed in a host matrix, at least a portion of the quantum dots having a band gap energy smaller than the energy of at least a portion of the light produced by the source, and the matrix allowing light from the source to pass therethrough. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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- 12. A quantum dot colloid, comprising a population of quantum dots dispersed in a nonconductive host matrix, each quantum dot having a substantially uniform surface energy, wherein the dots are of a size distribution, composition, or a combination thereof, selected to photoluminesce light of a spectral distribution of wavelengths characteristic of a selected color when the host matrix is irradiated with light from a primary source whose wavelength is shorter than the longest wavelength of said spectral distribution.
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21. A method of producing light of a selected color, comprising:
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providing at least one population of photoluminescent quantum dots dispersed in a host matrix, each quantum dot having a characteristic band gap energy, and irradiating the host matrix with a solid-state primary light source, said source emitting light of an energy greater than the characteristic band gap energy of at least a portion of the dots;
whereby the quantum dots photoluminesce light of the selected color when irradiated by the primary light source. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29)
providing at least one precursor material having quantum dots disposed therein; - and
reacting the precursor material to form a solid host matrix having quantum dots dispersed therein.
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25. The method of claim 21, where providing a population of quantum dots disposed in a host matrix includes,
providing at least two precursor materials, including a first precursor material having a first population of quantum dots having a first size distribution disposed therein and a second precursor material having a second population of quantum dots having a second size distribution disposed therein; -
combining the precursor materials; and
reacting the precursor materials to form a solid host matrix having quantum dots dispersed therein.
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26. The method of claim 25, where combining comprises mixing the precursor materials.
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27. The method of claim 25, where combining comprises depositing layers of the precursor materials.
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28. The method of claim 21, where the host matrix comprises at least one material selected from the group consisting of a polymer, a silica glass, and a silica gel.
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29. The method of claim 21, where the host matrix comprises a polymer selected from the group consisting of polystyrene, polyimides, and epoxies.
Specification