Quantum dot white and colored light-emitting devices
First Claim
1. A method of producing a light-emitting device, comprising:
- (a) providing a population of quantum dots (QDs) and a host matrix, wherein each QD of the population comprises a core of an independently selected size and composition, the population comprises a selected size distribution of QDs, and the QDs have a surface adapted to allow the QDs to be dispersed in the host matrix;
(b) dispersing the QDs in the host matrix; and
(c) illuminating the QDs disposed in the host matrix with a light source that emits primary light which causes the QDs to photoluminesce secondary light, thereby causing the light-emitting device to emit light comprising a mixture of primary and secondary light.
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Abstract
A light-emitting device comprising a population of quantum dots (QDs) embedded in a host matrix and a primary light source which causes the QDs to emit secondary light and a method of making such a device. The size distribution of the QDs 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 QDs themselves, or of a mixture of light emitted from the QDs and light emitted from the primary source. The QDs desirably are composed of an undoped semiconductor such as CdSe, and may optionally be overcoated to increase photoluminescence.
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Citations
13 Claims
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1. A method of producing a light-emitting device, comprising:
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(a) providing a population of quantum dots (QDs) and a host matrix, wherein each QD of the population comprises a core of an independently selected size and composition, the population comprises a selected size distribution of QDs, and the QDs have a surface adapted to allow the QDs to be dispersed in the host matrix;
(b) dispersing the QDs in the host matrix; and
(c) illuminating the QDs disposed in the host matrix with a light source that emits primary light which causes the QDs to photoluminesce secondary light, thereby causing the light-emitting device to emit light comprising a mixture of primary and secondary light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of preparing a device, comprising:
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(a) providing a prepolymer composition, comprising (i) a precursor material capable of being reacted to form a solid host matrix that allows light to pass therethrough, and (ii) a population of quantum dots (QDs) disposed in the precursor material, wherein each QD of the population comprises a core of an independently selected size and composition, and the population comprises a selected size distribution of QDs, (b) reacting the precursor material to form the host matrix with QDs dispersed therein; and
(c) providing a primary light source in optical communication with the host matrix with QDs dispersed therein.
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Specification