Plant illumination device and method
First Claim
1. A plant cultivation lighting device, comprising:
- a lighting system including a plurality of quantum dots of different sizes, each of the quantum dots being configured to produce light of a specific wavelength based on the size of the respective quantum dot,wherein the light produced by the quantum dots is absorbable by photomorphogenetic receptors of plants and thereby results in the lighting device producing an aggregate emission spectrum that causes a photomorphogenetic effect in the plants, andwherein the size distribution of said plurality of quantum dots produces the aggregate emission spectrum that is the same as the photosynthetically active radiation (PAR) spectrum, except that the emission spectrum omits or provides a very low intensity in the green yellow (500-600) nm band and comprises a high intensity spectral feature in the far red 700-800 nm band.
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Abstract
An improved method to produce artificial light for plant cultivation, an illumination device with a semiconductor light emission solution and device suited for plant cultivation in a greenhouse environment are described. The best mode is considered to be a lighting device with binary alloy quantum dots (110, 120, 130, 140, 150, 160) made by colloidal methods to produce a size distribution of quantum dots that produces an emission spectrum similar to the photosynthetically active radiation (PAR) spectrum. The methods and arrangements allow more precise spectral tuning of the emission spectrum for lights used in plant (310, 311) cultivation. Therefore unexpected improvements in the photomorphogenetic control of plant growth, and further improvements in plant production are realized.
14 Citations
18 Claims
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1. A plant cultivation lighting device, comprising:
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a lighting system including a plurality of quantum dots of different sizes, each of the quantum dots being configured to produce light of a specific wavelength based on the size of the respective quantum dot, wherein the light produced by the quantum dots is absorbable by photomorphogenetic receptors of plants and thereby results in the lighting device producing an aggregate emission spectrum that causes a photomorphogenetic effect in the plants, and wherein the size distribution of said plurality of quantum dots produces the aggregate emission spectrum that is the same as the photosynthetically active radiation (PAR) spectrum, except that the emission spectrum omits or provides a very low intensity in the green yellow (500-600) nm band and comprises a high intensity spectral feature in the far red 700-800 nm band. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 17, 18)
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10. A lighting method for plant cultivation, comprising:
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illuminating light produced by a plurality of quantum dots of different sizes to at least one plant, the light being absorbable by photomorphogenetic receptors of the at least one plant to cause a photomorphogenetic effect in the at least one plant, wherein the size distribution of said plurality of quantum dots produces an aggregate emission spectrum the same as the photosynthetically active radiation (PAR) spectrum, except that the emission spectrum omits or provides a very low intensity in the green yellow (500-600) nm band and comprises a high intensity spectral feature in the far red 700-800 nm band. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification