METHOD AND MEANS FOR ENHANCING GREENHOUSE LIGHTS
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Abstract
An illumination device with a semiconductor light emission solution has a wavelength up conversion feature and is suited for plant cultivation in a greenhouse environment. The best mode is considered to be a light device with at least one blue LED (101) with wavelength up conversion binary alloy quantum dots (110, 120, 130, 140, 150, 160) made by colloidal methods that are arranged to produce an emission spectrum similar to photosynthetically active radiation (PAR) spectrum with the blue LEDs. The methods and arrangements allow more precise spectral tuning of the emission spectrum for lights used in plant cultivation. Therefore unexpected improvements in the photomorphogenetic control of plant growth, and further improvements in plant (310, 311) production are realized. The device is especially advantageous for greenhouses that already have legacy LED systems. These LED systems can often just be upgraded by adding the quantum dot array to arrive at the lighting solution.
32 Citations
76 Claims
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1-39. -39. (canceled)
- 40. A lighting device for plant cultivation comprising at least one LED (101), characterised in that, said lighting device (100) comprises a plurality of quantum dots (110, 120, 130, 140, 150, 160) of different size arranged to up convert LED light to longer wavelengths.
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48. A lighting method for plant cultivation, comprises the steps of,
at least one plant (310, 311) and a plurality of quantum dots (110, 120, 130, 140, 150, 160) of different size is illuminated with at least one LED (101), light is absorbed by said plurality of quantum dots (110, 120, 130, 140, 150, 160) of different size, light is emitted by said plurality of quantum dots (110, 120, 130, 140, 150, 160) of different size at wavelengths longer than the absorbed radiation.
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57. A greenhouse light device, characterised in that, said light device comprises at least one quantum dot (110, 120, 130, 140, 150, 160) and at least one LED (101).
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58. A horticultural lighting fixture comprising at least one quantum dot and at least one LED having
a) first spectral characteristics including a peak in the wavelength range from 600 to 700 nm and arranged to exhibit a full width at half maximum of at least 50 nm or more; -
b) second spectral characteristics with a maximum of 50 nm full width at half maximum and arranged to exhibit a peak wavelength in the range from 440 to 500 nm, and c) all or part of the emission at a frequency of 600-800 nm is generated using a whole or partial wavelength up-conversion of the LED chip radiation power by the at least one quantum dot. - View Dependent Claims (60, 61, 62, 63, 64, 65, 66, 67)
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59. A horticultural lighting fixture comprising at least one LED and at least one quantum dot arranged to up convert emitted radiation from said LED having
a) first spectral characteristics including a peak in the wavelength range from 600 to 700 nm and arranged to exhibit a full width at half maximum of at least 50 nm or more; -
b) second spectral characteristics with a maximum of 50 nm full width at half maximum and arranged to exhibit a peak wavelength in the range from 440 to 500 nm, and c) at least a part or the whole of the emission at wavelengths of 500-600 nm is arranged to be minimized and/or omitted and/or to be reduced below the intensity in 400-500 nm band and below the intensity in 600-700 nm band.
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68. A light emitting component of a horticultural light, comprising;
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a light emitting diode (LED) semiconductor chip; and a light wavelength up-conversion quantum dot which is deposited in direct proximity of the LED semiconductor chip; said component being capable of emitting two characteristic light emission peaks, and at least a part or the whole of the emission at wavelengths of 500-600 nm is arranged to be minimized and/or omitted and/or to be reduced below the intensity in 400-500 nm band and below the intensity in 600-700 nm band. - View Dependent Claims (69, 70, 71, 72, 73, 75)
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Specification