• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:NL2008815A
    申请号:NL2008815
    申请日:2012-05-14
    公开日:2013-06-17
    发明作者:Hsing Chen
    申请人:Solidlite Corp；
    IPC主号:
    专利说明:

    LIGHT EMITTING DIODE FOR PLANT GROWTH
    FIELD OF THE INVENTION
    The present invention relates to a lighting device for plant growth, and the use thereof. The present invention further relates to the manufacture of such a device.
    DESCRIPTION OF THE PRIOR ART
    It is known that different light intensity, light spectra and lengths of light exposure time may result in different growths of plants . Photosynthesis is the most important part to the growth of plants. Accordingly, plants deserve light with a certain light spectrum for optimum plant growth. The spectrum shown in FIG.l is the most efficient light for photosynthesis which is well known in agriculture literatures. Any artificial light has its spectrum closest to that shown in FIG. 1 possesses the highest efficiency of photosynthesis .
    Artificial lights for plant growths have been widely used in agriculture and horticulture for higher productivity and off-season harvest. There are some types of light sources that are currently in use for stimulating plant growth : A first known option is a fluorescent lamp: The fluorescent lamps used in plant growth have the advantage of energy-saving, but its life is short comparing with that of LEDs . Another shortcoming is a low photosynthesis efficiency. The spectrum of a fluorescent lamp is shown in FIG. 2 and deviates from that of the photosynthesis spectrum shown in FIG. 1. Moreover, the disposal of fluorescent lamps causes environment pollution.
    A second known option is a high pressure sodium lamp : High pressure sodium lamps have the advantages of higher power available, larger illuminated area, but with shorter life comparing with that of LED. Another shortcoming is a low photosynthesis efficiency; The spectrum of a high pressure sodium lamp is shown in FIG. 3 and deviates from that of the photosynthesis spectrum shown in FIG. 1. A further shortcoming is that the high pressure sodium lamps generate too much heat which obstructs plant growth.
    A third known option is a A LED lighting module with red LED chips and blue LED chips inside. This lighting module has the advantages of energy saving, long life and low heat. However the photosynthesis efficiency is low. Its spectrum is shown in FIG. 4 and deviates from that of the photosynthesis spectrum shown in FIG. 1. Carbon dioxide is a necessary constituent for photosynthesis for green plants. Carbon dioxide is absorbed by plants through stomas on leafs. The absorption is controlled by the size of opening slots of stomas. The blue light (440-460nm) plays the role for controlling stomas opening. Therefore, most of the current market available LED lamps contain both red LED chips and blue LED chips (commonly with a ratio of 8 :1) . But the big problem is the spectrum has only two sharp peaks (shown in FIG. 4) . The absence of other wavelengths (particularly of any wavelength of 700nm or more) results in low photosynthesis efficiency and abnormal photomorphogenesis .
    SUMMARY OF THE INVENTION
    The present invention relates to a lighting device for plant growth andprovidesspectra closelymatching the photosynthesis spectrum. It has thus the advantage of enhancing plant growth rates at lower cost.
    Besides, the present invention with broad spectra (comparing the sharp peaks LED type) can be applied with different light intensity & lengths of light exposure time & varying temperatures which could affect the morphogenesis of plants. That could make the plant life cycles short and could delay or advance the natural harvest seasons for good market.
    For the above-mentioned purposes, this invention comprises a blue LED chip with wavelength of 440-460 nm and At least two phosphor powders of different color are present, one of which is a red phosphor. The phosphor powders are mixed with an optically transparent encapsulating material to a mixture that encapsulates the blue LED chip. In operation upon applying electricity, the device emits light with a spectrum substantially corresponding to a light spectrum
    The LED chip could excite phosphors as well as play the role for controlling stoma openings on leaves to absorb carbon dioxide. Blue light 440-460nm affects the opening and closing of stomas and the amount of carbon dioxide absorption accordingly By formulating the phosphors, the emitted light will have the spectral very close to that of light necessary for plant photosynthesis shown in FIG.1. It is a prominent invention combining a stoma opening function with photosynthesis function in one LED lighting device.
    The unit expressed in vertical axis in attached figures. is "relative intensity of the energy". A scientifically sound unit would be "micro mole photon per square meter per second". But due to that this is an emerging technology, there is no commercial instruments available to measure the photon flux intensity, and the relative intensity of the energy, as compared to the unit, "Lux" or "Lumen per square meter", is an appropriate alternative, even though the Lux is focussed on the human sensation for light. The invention further relates to the manufacture of such a device and the use thereof for the stimulation of plant growth.
    In accordance with a second aspect, the invention thereto provides a method of manufacturing a lighting device comprising the steps of : (1) providing a blue LED chip having the wavelength of 4 4 0-4 60nm ; (2) Mixing at least two phosphor powders of different color, one of which is a red phosphor with an optically transparent encapsulating material to a mixture; (3) Encapsulating the blue LED chip with the mixture of encapsulating material and phosphor powders. Herein, the phosphor powders are mixed and chosen such that in operation upon applying electricity, the device emits light with a spectrum substantially corresponding to a light spectrum necessary or optimum for plant photosynthesis.
    The device and the method according to the invention are particularly embodied in accordance with any of the dependent claims, and especially as will be further elucidated hereinafter with reference to the Figures. Any feature discussed in relation to one aspect of the invention is also applicable to another aspect of the invention.
    BRIEF DESCRIPTION OF THE DRAWINGS
    FIG. 1 shows the most efficient spectrum for plant photosynthesis; FIG.2 shows the spectrum of a fluorescent lamp;.
    FIG.3 shows the spectrum of a high-pressure sodium lamp; FIG. 4 shows the spectrum of a LED lighting device containing red LED chips and blue LED chips; FIG.5 shows the structure of the present invention; FIG. 6 shows the spectrum of the 1SLembodiment of this invention; FIG.7 shows the CIE chromaticity coordinates of FIG.6; FIG. 8 shows the spectrum of the 2nd embodiment of this invention; FIG.9 shows the CIE chromaticity coordinates of FIG.8; FIG.10 shows the spectrum of the 3rd embodiment of this invention, and FIG.11 shows the CIE chromaticity coordinates of FIG.10.
    DETAILED DESCRIPTION OF THE PREFFERRED EMBODIMENT
    All the embodiments mentioned here are referred to FIG.5 for structure and constituents present therein.. These figures are schematical in nature and not drawn to scale . The present invention is a lighting device for plant growth, it comprises a blue LED chip 10 as the light source having the wavelength of 440-460nm and at least two phosphor powders of different color 12, one of which is a red phosphor. The phosphors 12 are mixed with an encapsulating material, which is in a suitable embodiment a silicone gel 14 . The mixture is preferably a homogeneous mixture, such that the different powders are present in substantially uniform distribution and mixed together. After applying the mixture, the encapsulating material is cured as known to the skilled person. Alternative encapsulating materials, such as an epoxy are not excluded, but are deemed less optimal. The re suiting mixture encapsulates the blue LED chip 10.
    Preferably, the powders are present in the full encapsulation, although it is not excluded that the silicone gel is applied in different layers having different composition. For instance, a first layer encapsulating any wirebonds could have a lower density of phosphor powder, down to a layer without phosphor powder. Alternatively, different layers with different phosphors could be applied, such as a first layer with a red phosphor and a second layer with a yellow or green phosphor . However, such a structure has the disadvantage that the resulting CIE chromaticity is difficult to control during manufacture and against higher cost. The powders more preferably have a size in the range of 5 to 15 micrometer . This turns out to be appropriate, both for processing the mixture of encapsulating material with phosphor powders, and for obtaining the desired optimum spectrum based on the light emitted from the blue LED chip.
    According to a first embodiment illustrated in FIG..6 and Fig.7, the device comprises a green phosphor, which emits light with wavelength 515-540nm, and a red phosphor that emits light with wavelength 600-780nm. Preferably, the green phosphor is a silicate, for instance with chemical formula [BaxSri-x] 2S1O4: RE, wherein 0 <x< 1 and wherein RE stands for Rare Earth element and is suitably Europium.
    Preferably, the red phosphor is a Calcium containing silicon nitride doped with a rare earth element, for instance with chemical formula CaAlSiN3: RE or Ca2SisN8 : RE, wherein RE stands for Rare Earth Element and is suitably Europium. Alternative suitable red and green phosphors will be apparent for the skilled person. Suitably, the mass ratio of green phosphor to red phosphor ratio is between 0.05 (5:95) to 0.25 (20:80), more preferably between 0.10 (10:90) to 0.18 (15:85). A very suitable ratio is 12:88. The phosphors 12 are mixed with silicone gel 14 , and the mixture encapsulates the blue LED chip 10, this integrated body could emit light when applied with electricity. It provides spectra closely matching the photosynthesis spectrum FIG.1. The spectra when expressed in luminous scale their CIE chromaticity coordinates will fall in the range of X : 0.31-0.35, Y: 0.31- 0.38. The results were obtained with a LED chip of the type AL1411A as manufactured by Solidlite Corporation, and being a topview LED of type 1411 in a surface mount package (SMD) of SMD-L/F-1.9t. having a maximum current of 7 50 mA and a driving voltage of 4 5V. The blue LED chip typically comprises a plurality of light emitting diodes .
    According to a second embodiment 2, as illustrated in FIG..8 and Fig.9, the phosphor powders 12 comprise a green phosphor that emits light with wavelength 515-540nm, a yellow phosphor that emits light with wavelength 540-570nm and a red phosphor that emits light with wavelength 600~780nm.
    Both the green phosphor and the yellow phosphors are suitably silicates with chemical formula [BaxSri-x] 2S1O4: RE, wherein 0 <x< 1 and wherein RE stands for Rare Earth element and is suitably Europium. The red phosphor is suitably a nitride as mentioned hereabove.
    The mass ratio of green phosphor to yellow phosphor to red phosphor ratio is as a: b: c, with a = 30-60, b = 30-60 and c = 10-2 0, with a+b+c=100, if three phosphors are present. More preferably, the amount of a (green phosphor) is smaller than that of b (yellow phosphor) , preferably in a mutual ratio of 3:4 to 7:8, for instance approximately 4:5. The ratio of red phosphor to the sum of yellow and green phosphor is preferably in the range of 5:95 to 20:80, more preferably in the range of 10:90 to 15:85. A suitable mass ratio is a:b:c = 38 : 49:13. In operation, The device provides spectra closely matching the photosynthesis spectrum FIG.1. The spectra when expressed in luminous scale their CIE chromaticity coordinates will fall in the range of X : 0.31-0.46, Y: 0.25-0.36. In a third embodiment 3, as illustrated in FIG..10 and Fig.11, the phosphor powders 12 comprise a yellow phosphor, which emits light with wavelength 540-57Onm and a red phosphor that emits light with wavelength 600-780nm. The yellow and red phosphors preferably have a composition as mentioned above . The phosphors 12 are mixed with silicone gel 14 , and the mixture encapsulates the blue LED chip 10, this integrated body could emit light when applied with electricity. It provides spectra closely matching the photosynthesis spectrum FIG.1. The spectra when expressed in luminous scale their CIE chromaticity coordinates will fall in the range of X: 0.37-0.4 6, Y: 0.30- 0.36.
    Those above-mentioned embodiments manifest this present invention about a lighting device for plant growth, providing spectra closely matching the photosynthesis spectrum, FIG. 1, and enhances plants growth rates at lower cost. It is composed of a blue LED chip as the light source with at least two different colors of phosphor powders, one of which must be red phosphor. The phosphors are mixed with silicone gel, and the mixture encapsulates the blue LED chip, this integrated body could emit light when applied with electricity. By formulating the phosphors, the emitted light will have the spectral very close to that of light necessary for plant photosynthesis .
    Repeated experiments of the mentioned embodiments concluded that the spectra will have a good match with photosynthesis spectrum (FIG. 1) if their luminous scale CIE chromaticity coordinates fall in the range of X : 0.31-0.46, Y : 0.25-0.38. The present invention of lighting device provides out-standing plants growth rates at lower cost than those artificial lights available in the market. This invention comprehends a lighting device for plant growth, composed of a right blue LED chip as the light source with right recipes of phosphor powders. It has the combined functions of good plant photosynthesis, stoma opening stimulation and photomorphogenesis in one single device. It is a very prominent invention of artificial lights for plant growth ever seen.
    The invention further relates to the use of the lighting device for the stimulating of plant growth. It is preferably applied for vegetables, such as mushrooms, green plants like lettuce and spinach, cron, rice and tomatoes and fruit.
    While the invention has been described by the way of examples and in terms of preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments . On the contrary, it is intended to cover various modifications . Therefore, the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications .
    权利要求:
    Claims (19)
    [1]
    A plant growth lighting device comprising A blue LED chip with a wavelength of 440-460 nm, and at least two phosphor powders of different color, one of which is a red phosphor, wherein the phosphor powders are mixed with an optically transparent envelope material in a mixture comprising the blue LED chip, and wherein, in operation when supplying electricity, the device emits light with a spectrum that essentially corresponds to a spectrum that is optimal or necessary for photosynthesis of the plant.
    [2]
    The illumination device of claim 1, wherein the red phosphor emits light with a wavelength in the range of 600 to 780 nm.
    [3]
    A lighting device according to claim 2, wherein the red phosphorus is a silicon nitride, preferably a calcium-containing silicon nitride doped with a rare earth metal.
    [4]
    The illumination device according to claim 3, wherein the red phosphor contains a silicon nitride with chemical formula CaAlSiN3: RE or Ca2SisN8: RE, where RE stands for a rare earth element.
    [5]
    A lighting device according to any of the preceding claims 1-4, wherein the second phosphor powder is a green phosphor that emits light with a wavelength of 515 to 540 nm.
    [6]
    Lighting device according to claim 5, wherein the green phosphor is a silicate with the chemical formula [BaxSri_x] 2S1O4: RE, where RE stands for a rare earth element and wherein 0 <x <1.
    [7]
    The lighting device according to claim 4 or 6, wherein the rare earth element (RE) is Europium (Eu).
    [8]
    The plant growth lighting device according to any of claims 5-7, wherein the mass ratio of the red phosphorus to the green phosphorus is in the range of 0.05 (5: 95) to 0.25 (20:80), preferably in the range of 0.10 (10:90) to 0.18 (15:85).
    [9]
    The plant growth lighting device according to any of claims 5-8, wherein the CIE chromaticity of the spectrum expressed on a luminance scale falls within the range of X: 0.31-0.35 and Y: 0.31-0.38.
    [10]
    The plant growth lighting device according to any of claims 1 to 9, wherein a yellow phosphor powder is present, which emits light with a wavelength of 540 to 670 nm.
    [11]
    A plant growth lighting device according to claim 10. wherein the yellow phosphor is a silicate with chemical formula [BaxSri-x] 2S1O4: RE, wherein RE represents a rare earth element and is preferably Europium (Eu) and wherein 0 <x < 1.
    [12]
    12. Plant growth lighting device according to claims 10 or 11, wherein the mass ratio of green phosphorus, yellow phosphorus and red phosphorus is a: b: c, with a = 30-60, b = 30-60 and c = 10-20, with a + b + c = 100 when three phosphors are present.
    [13]
    The plant growth lighting device according to claim 12, wherein the CIE chromaticity of the spectrum expressed on a luminance scale falls within the range of X: 0.31-0.46 and Y: 0.25-0.36.
    [14]
    The lighting device according to claim 10 or 11, wherein the mass ratio of yellow to red phosphorus is in the range of 0.10 (10:90) to 0.25 (20:80), preferably in the range of 0.15 to 0.20.
    [15]
    The lighting device of claim 14, wherein the CIE chromaticity of the slit rum printed on a luminance scale falls within the range of X: 0.37-0.36 and Y: 0.30-0.36.
    [16]
    The lighting device of any one of the preceding claims, wherein the encapsulating material is a silicone gel.
    [17]
    A lighting device according to any one of the preceding claims, wherein the phosphor powders are homogeneously mixed with the encapsulating material.
    [18]
    Use of the lighting device according to one of the preceding claims for stimulating plant growth.
    [19]
    A method for manufacturing a lighting device, in particular according to any one of claims 1 to 17, comprising the steps of: - providing a blue LED chip; - mixing at least two phosphor powders of different color, one of which is a red phosphorus, with an optically transparent coating material; - enclosing the blue LED chip with the mixture of encapsulating material and the phosphor powders, wherein the phosphor powder is selected and mixed such that in operation when electricity is supplied, the device emits light with a spectrum that essentially corresponds to a spectrum that optimally or is necessary for photosynthesis of the plant.
    类似技术:
    公开号 | 公开日 | 专利标题
    RU2580325C2|2016-04-10|Light emitting device, light source based on light-emitting diode for plant cultivation and plant factory
    US8847507B2|2014-09-30|Illuminating device
    KR101783368B1|2017-10-10|Horticultural led lighting assembly
    EP2356702B1|2017-11-22|Phosphor conversion light-emitting diode for meeting photomorphogenetic needs of plants
    NL2008815C2|2014-08-13|Light emitting diode for plant growth.
    US20120161170A1|2012-06-28|Generation of radiation conducive to plant growth using a combination of leds and phosphors
    KR20120091114A|2012-08-17|Lighting device with defined spectral power distribution
    JP2021520066A|2021-08-12|Multi-luminescent material for inactivating microorganisms
    US20130187180A1|2013-07-25|Light emitting diode for plant growth
    CN111180429A|2020-05-19|Solar spectrum-like plant lighting packaging body and manufacturing method thereof
    CN109538952A|2019-03-29|Flip chip type plant light compensation LED light source and the lamps and lanterns for using the light source
    JP2015033367A|2015-02-19|Illumination device for plants, cultivation shelf, plant factory, and plant cultivation method
    JP2013147584A|2013-08-01|Plant growth light-emitting diode
    CN109538979B|2020-09-15|LED device and lamps and lanterns for plant light filling
    CN109854979B|2020-04-14|LED device and lamps and lanterns for flip-chip type plant light filling
    TW201507605A|2015-03-01|Led lighting module for plant-culture factory, and led lighting apparatus for plant-culture factory using the same
    RU153425U1|2015-07-20|LAMP FOR GREENHOUSES
    US20210329757A1|2021-10-21|Cyan enriched white light
    WO2018179105A1|2018-10-04|Method for manufacturing lighting device
    JP2022515455A|2022-02-18|LED lighting device with additional functions
    TWI251943B|2006-03-21|A method of making yellow-white light source by UV-LED
    CN106051551A|2016-10-26|Illumination method and illumination equipment assisting plant growth
    WO2020230742A1|2020-11-19|Semiconductor light-emitting device for plant growth, lighting method, and design method
    JP2021520612A|2021-08-19|LED light source for plant supplementation and lighting equipment equipped with the light source
    TW201433736A|2014-09-01|Light emitting diode lamp and light emitting diode unit
    同族专利:
    公开号 | 公开日
    TW201323573A|2013-06-16|
    NL2008815C2|2014-08-13|
    KR20130067205A|2013-06-21|
    TWI470058B|2015-01-21|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US20030076028A1|2001-10-19|2003-04-24|Manabu Nieda|Method of activating photocatalysis, photocatalytic discharge tube, and device using the same|
    US20110242437A1|2006-12-05|2011-10-06|Samsung Led Co., Ltd.|White light emitting device and white light source module using the same|
    US20100025656A1|2008-08-04|2010-02-04|Soraa, Inc.|White light devices using non-polar or semipolar gallium containing materials and phosphors|
    CN102206492A|2011-03-23|2011-10-05|李迎九|Special rare earth composite phosphor for three-band plant growth lamp and preparation method thereof|
    RU2010132369A|2008-01-03|2012-02-10|Конинклейке Филипс Электроникс Н.В. |DISPLAY DEVICE AND LIGHTING DEVICE|
    EP2484966A1|2009-09-30|2012-08-08|Panasonic Corporation|Illumination device|TWI638045B|2016-10-11|2018-10-11|詮興開發科技股份有限公司|Mass production method of microalgae|
    TWI631728B|2017-05-03|2018-08-01|詮興開發科技股份有限公司|Light-emitting diode module for plant growth|
    CN109863902A|2018-12-12|2019-06-11|福建省中科生物股份有限公司|The illumination method and plant lamp of promotion plant growth and its application|
    KR102263850B1|2019-01-31|2021-06-11|비에이메테리얼스|White led package for preventing insect|
    WO2020191738A1|2019-03-28|2020-10-01|厦门三安光电有限公司|Lighting fixture used for microalgae cultivation and manufacturing method for said lighting fixture|
    法律状态:
    2016-02-03| MM| Lapsed because of non-payment of the annual fee|Effective date: 20150601 |
    优先权:
    申请号 | 申请日 | 专利标题
    TW100145870A|TWI470058B|2011-12-13|2011-12-13|
    TW100145870|2011-12-13|
    [返回顶部]