CN114752380B - Plant illumination blue light emitting device, illumination device and application - Google Patents
Plant illumination blue light emitting device, illumination device and application Download PDFInfo
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7728—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing europium
- C09K11/77342—Silicates
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G7/00—Botany in general
- A01G7/04—Electric or magnetic or acoustic treatment of plants for promoting growth
- A01G7/045—Electric or magnetic or acoustic treatment of plants for promoting growth with electric lighting
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7728—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing europium
- C09K11/7735—Germanates
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
- H01L33/502—Wavelength conversion materials
Abstract
The application discloses a plant illumination blue light emitting device, an illumination device and application, and belongs to the technical field of illumination devices. The plant illumination blue light emitting device comprises an excitation chip and a light conversion layer; the light conversion layer comprises a luminescent material and an organic colloid; the luminescent material comprises blue fluorescent powder; the blue fluorescent powder is selected from any one of substances shown in a formula I. The application increases the half-width of blue light spectrum by adopting the luminescent device packaged by the specific blue fluorescent powder, meets the spectrum range requirement of blue light required by plant growth, promotes plant growth and improves productivity.
Description
Technical Field
The application relates to the technical field of lighting devices, in particular to a blue light emitting device for plant lighting, a lighting device and application.
Background
The plant illumination weakens the restriction of natural light environment to agricultural production activities, and the efficient plant light control method can promote the growth and development of plants, thereby achieving the purposes of yield increase, high efficiency, high quality, disease resistance and no public hazard and enhancing the agricultural output capability. The application field of plant illumination mainly comprises greenhouse light supplementing, full-artificial light plant factories, plant tissue culture, field light supplementing, household vegetable and flower planting and the like. Research shows that lettuce grows for 70 days, the plant factory only needs 21-25 days, the planting time is one third of that of natural plants, the plant factory can build more than ten layers, and the productivity of the same land area is more than 40-100 times of that of the open field. Therefore, the artificial plant illumination can greatly shorten the growth time of plants and improve the productivity.
Generally, red light and blue light are important components of the plant illumination spectrum. Research has shown that plants do not utilize all of the components of sunlight for photosynthesis, red and blue light being two spectra that are important for plant growth. The main absorption spectra of chlorophyll a, chlorophyll b and carotenoids were concentrated in the 400-500 nm blue and 600-700 nm red light.
In the plant illumination of the current LED lamp, the blue light intensity is mainly provided by a blue light chip of LED gallium nitride, the wavelength coverage of the blue light chip of the LED gallium nitride ranges from 430nm to 480nm, but the half-width of the spectrum of the chip is narrower, only about 20nm, and the spectrum range of blue light required by plant growth can not be completely met.
Blue fluorescent powder based on excitation of purple light LED, such as Sr 5 (PO 4 ) 3 Cl:Eu 2+ The method has a short emission wavelength of about 430-440 nm, and the short wavelength often causes the problems of reduced production of plant carotenoid and the like, so that the method can not meet the requirement of plant growth.
Other blue phosphors based on excitation of violet LEDs, e.g. Sr 3 MgSi 2 O 8 :Eu 2+ ，BaMgAl 10 O 12 Eu and the like, the emission wavelength is about 450nm, and the excitation is usually carried out by adopting 380-420 nm of purple light, on one hand, the existing fluorescent powder can effectively absorb about 380-400nm of purple light, but the photosynthetic photon flux of the fluorescent powder after the excitation of the purple light is lower; on the other hand, the existing fluorescent powder has lower ultraviolet light absorption efficiency of 410-420nm, so that the photosynthetic photon flux is lower. The lower photosynthetic photon flux makes more lighting devices needed in unit area, reduces economic benefit and improves energy consumption.
Disclosure of Invention
Aiming at the problem that the blue fluorescent powder in the prior art has lower absorption efficiency on 410-420nm purple light, so that the emission light of the blue fluorescent powder cannot meet the demand of plant illumination based on 410-420nm purple light chips on the blue fluorescent powder, the patent provides the blue luminous fluorescent powder which can be used for plant illumination, the emission wavelength of the fluorescent powder is 460-470nm and can effectively absorb the purple light emitted by 410-420nm emitted purple light LED chips, the blue fluorescent powder can be used for preparing plant illumination based on the purple light LED chips and having higher performance compared with the existing plant illumination, the luminous intensity is greater than 10-12% of the plant growth rate and the illumination intensity in a proportional relation, and the stronger the illumination is, the plant growth is faster, and the ageing resistance is better.
The application provides a plant illumination blue light emitting device, which meets the blue light requirement for plant growth by adopting a light emitting device packaged by specific blue fluorescent powder, promotes plant growth, shortens the growth period of plants and improves productivity.
A plant illumination blue light emitting device comprises an excitation chip and a light conversion layer;
the light conversion layer comprises a luminescent material and an organic colloid;
the luminescent material comprises blue fluorescent powder;
the blue fluorescent powder is selected from any one of substances shown in a formula I:
（M 3-a-x ，A a ）Mg（Si 2-b ，D b ）O 8-a E a ：xEu 2+ i
In formula I, M comprises an element Sr;
a is at least one selected from alkali metal elements;
d, selecting at least one element in IVA group;
e is selected from at least one of halogen;
a is more than or equal to 0.001 and less than or equal to 0.3;
b is more than or equal to 0 and less than or equal to 0.3;
x is more than or equal to 0.001 and less than or equal to 0.4.
Optionally, the mass ratio of the luminescent material to the organic colloid is 0.5-2: 1.
alternatively, in the formula I, M is Sr element; or M also comprises at least one of Ca element and Ba element.
Optionally, in the formula I, A is at least one of Na element and K element; and/or the number of the groups of groups,
d is at least one selected from Ge element and Sn element; and/or the number of the groups of groups,
e is at least one selected from Cl element and F element.
Alternatively, the substance of formula I belongs to space group P21/a.
Optionally, the peak value of the emission spectrum of the substance shown in the formula I corresponds to a wavelength in a range from 460nm to 470nm.
Alternatively, the emission spectrum of the substance of formula I has a half-width in the range of 30nm to 40 nm.
Optionally, the peak value of the excitation spectrum of the excitation chip corresponds to a wavelength in a range from 380nm to 420 nm.
Optionally, the peak value of the excitation spectrum of the excitation chip corresponds to a wavelength in a range from 410nm to 420 nm.
Optionally, the plant illumination blue light emitting device further comprises a support, wherein the support is provided with an inner groove, the excitation chip is installed in the inner groove, and the light conversion layer is located in the inner groove and around the excitation chip.
Optionally, the photosynthetic photon flux of the plant illumination blue light emitting device is 400-600 umol/s.
Optionally, the plant illumination blue light emitting device is used for illuminating plants, including crops. Preferably, the crop is an economic crop. Such as oil crops, vegetable crops, fruits, flowers, grasses, trees.
Optionally, the crop comprises any one of strawberry, tomato, lettuce.
According to a second aspect of the present application, there is also provided an illumination apparatus comprising a plant-illuminated blue light emitting device as described in any one of the above.
According to a third aspect of the present application there is also provided the use of a plant-lit blue light emitting device as defined in any one of the preceding claims in a plant growing process.
The technical scheme provided by the application has the beneficial effects that at least:
(1) By adopting the specific blue fluorescent powder, compared with a blue light chip, the spectrum of the blue light emitted by the fluorescent powder is increased by half width (in the range of 30-40 nm) to improve the spectrum in plant illumination, promote plant growth and shorten the growth period. Especially for economic crops, such as oil crops, vegetable crops, fruits, flowers, grasses, can promote the growth of the plants.
(2) The blue fluorescent powder can be used for preparing plant illumination with higher performance compared with the existing plant illumination based on the purple light LED chip, the photosynthetic photon flux is 10-12% higher than that of the blue fluorescent powder scheme in the prior art, and the ageing resistance is more excellent, so that the number of devices used in unit area can be reduced, the economic benefit is improved, and the energy consumption is reduced.
(3) The blue fluorescent powder can efficiently absorb the purple light of 410-420nm, so that the photosynthetic photon flux is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a blue light emitting device for plant illumination according to an embodiment of the present application;
FIG. 2 is a spectrum diagram of a blue phosphor # 1 provided in an embodiment of the present application;
FIG. 3 is a spectrum diagram of a blue phosphor # 2 provided in an embodiment of the present application;
FIG. 4 is a spectrum of a 3# blue phosphor provided in an embodiment of the present application;
FIG. 5 is a spectrum diagram of a blue light chip according to comparative example 1 of the present application;
fig. 6 is a live view of a plant illumination blue light emitting device according to an embodiment of the present application.
Detailed Description
The plant illumination blue light emitting device of the present application may refer to the schematic diagram in fig. 1 in particular. In fig. 1, the LED support 3 is provided with a concave groove, and the cross section of the groove may be trapezoidal as shown in fig. 1, or may be any other suitable shape, for example, rectangular, square, or oval, etc., which is not strictly limited by the present application. The excitation chip 2 is placed on the inner bottom surface of the recess, and then the recess is filled with a mixture containing a luminescent material and an organic colloid.
When the LED lamp is used, the excitation chip 2 is fixed on the LED bracket 3, the chip emits light after being electrified and lightened, and fluorescent powder excited by light emitted by the chip forms required mixed light.
The luminescent material comprises blue fluorescent powder; the blue fluorescent powder is selected from any one of substances shown in a formula I: (M) 3-a-x ，A a ）Mg（Si 2-b ，D b ）O 8-a E a ：xEu 2+ I
In formula I, M comprises an element Sr; a is at least one selected from alkali metal elements; d, selecting at least one element in IVA group; e is selected from at least one of halogen;
a is more than or equal to 0.001 and less than or equal to 0.3; b is more than or equal to 0 and less than or equal to 0.3; x is more than or equal to 0.001 and less than or equal to 0.4.
Preferably, in said formula i, M is an element Sr; or M also comprises at least one of Ca element and Ba element. That is, the blue phosphor is (Sr) 3-a-x ，A a ）Mg（Si 2-b ，D b ）O 8-a E a ：xEu 2+ The method comprises the steps of carrying out a first treatment on the surface of the Or the blue fluorescent powder can also be ((Sr, ca) 3-a-x ，A a ）Mg（Si 2-b ，D b ）O 8-a E a ：xEu 2+ 、（（Sr，Ba） 3-a-x ，A a ）Mg（Si 2-b ，D b ）O 8-a E a ：xEu 2+ Or ((Sr, ca, ba) 3-a-x ，A a ）Mg（Si 2-b ，D b ）O 8-a E a ：xEu 2+ 。
Preferably, in the formula I, A is at least one of Na element and K element; and/or the number of the groups of groups,
d is at least one selected from Ge element and Sn element; and/or the number of the groups of groups,
e is at least one selected from Cl element and F element.
Preferably, in the formula I, the value range of a is more than or equal to 0.02 and less than or equal to 0.2; and/or the number of the groups of groups,
b is more than or equal to 0 and less than or equal to 0.1; and/or the number of the groups of groups,
x is more than or equal to 0.01 and less than or equal to 0.2.
Preferably, the substance of formula I belongs to the group of spaces P21/a.
Preferably, the crystallinity of the blue fluorescent powder is 90% -99.9%.
The crystallinity can be obtained from the X-ray diffraction spectrum of the fluorescent powder, and the calculation formula is that
Crystallinity X c =I c/ （I c +I a ）
Wherein I is c Is the sum of the intensities of all diffraction peaks, I a Is the scattering intensity of the amorphous phase.
Preferably, the median particle diameter of the blue fluorescent powder is 2-30 μm. The median particle diameter here is D50.
Optionally, the luminescent material is blue phosphor.
The following describes the preparation method of the blue fluorescent powder:
s100, mixing an M source, an A source, an Mg source, an Si source, an E source, an Eu source and a D source according to the stoichiometric ratio meeting the formula I to obtain a mixture;
and S200, firing the mixture for 1-10 hours at 1150-1500 ℃ in a reducing atmosphere to obtain the fluorescent powder material.
Alternatively, the M source comprises any one of M oxide, M carbonate.
For example, the M source may be SrCO 3 、BaCO 3 、CaCO 3 、CaO、SrO、BaO。
Alternatively, the a source comprises any one of an a oxide, an a carbonate, an a halide.
For example, the A source may be NaCl, KCl, naCO 3 、KCO 3 、K 2 O，Na 2 O, etc.
Alternatively, the E source comprises an A halide, NH 4 Any one of the salt halides.
For example, the E source may be NaCl, KCl, NH 4 Cl, and the like.
Optionally, the D source comprises D oxide.
For example, the D source may be GeO 2 ，SnO 2 Etc.
In the process of batching, the element A and the element E are equimolar.
The better batching mode is as follows: the A halide is used as the A source and the E source, and the M source and the D source are selected from non-halide forms.
Optionally, the heating process of the firing includes:
a first temperature rising stage: the temperature range is 25-800 ℃, and the heating rate is 8-20 ℃ per minute;
a second temperature rising stage: the temperature range is 800-1100 ℃, and the heating rate is not less than 4 ℃/min and not more than 5 ℃/min;
and a third temperature rising stage: the temperature is higher than 1100 ℃ in a temperature interval, the heating rate is not lower than 1 ℃/min and not higher than 5 ℃/min.
Specifically, the heating process of the firing comprises the following steps:
a first temperature rising stage: the upper limit of the heating rate is any one value selected from 9 ℃/min, 10 ℃/min, 11 ℃/min, 12 ℃/min, 15 ℃/min and 20 ℃/min, and the lower limit of the heating rate is any one value selected from 8 ℃/min, 9 ℃/min, 10 ℃/min, 11 ℃/min, 12 ℃/min and 15 ℃/min in a temperature range of 25-800 ℃.
A second temperature rising stage: the upper limit of the temperature rising rate is selected from any value of 4.5 ℃/min and 5 ℃/min in the temperature range of 800-1100 ℃; the lower limit of the temperature rising rate is selected from any value of 4 ℃/min and 4.5 ℃/min.
And a third temperature rising stage: the upper limit of the temperature rising rate is selected from any value of 2 ℃/min, 3 ℃/min and 5 ℃/min in a temperature interval above 1100 ℃; the lower limit of the heating rate is selected from any one of 1 ℃/min, 2 ℃/min and 3 ℃/min.
The peak value of the emission spectrum of the blue fluorescent powder, namely the substance shown in the formula I, corresponds to the wavelength in the range of 460nm to 470nm.
The half-peak width of the emission spectrum of the blue fluorescent powder, namely the substance shown in the formula I, is in the range of 30nm to 40 nm. In the application, the substance shown in the formula I can realize that the half-width of an emission spectrum is within the range of 30nm to 40nm, and the half-width of the spectrum is increased, so that the growth of plants can be effectively promoted.
In the application, the organic colloid can be any one of silica gel, silicone resin and epoxy resin.
The mass ratio of the luminescent material to the organic colloid is 0.5-2: 1. the excessive mass ratio of the luminescent material to the organic colloid can cause that the viscosity of the luminescent material colloid is too large to carry out LED dispensing operation and manufacturing, and the excessive concentration of the organic colloid can reduce the luminous efficiency of the luminescent device; too low a ratio may result in light emitted from the LED chip not being completely absorbed by the phosphor and thus reducing the intensity of blue light.
Preferably, the mass ratio of the luminescent material to the organic colloid is 1:1.
optionally, the peak value of the excitation spectrum of the excitation chip corresponds to a wavelength in a range from 380nm to 420 nm.
Preferably, the peak value of the excitation spectrum of the excitation chip corresponds to a wavelength in a range from 410nm to 420 nm.
The plant illumination product often needs the combination of different light emitting devices such as blue light, white light, red light, far red light and the like, so as to meet the requirements of the whole lamp on power, PPF, spectrum proportion, cost and the like. The plant illumination blue light emitting device is combined with other color light emitting devices, and specific spectrum and illuminance can be adjusted according to growth periods of different plants.
The raw materials used in the examples in the application are commercially available unless otherwise specified.
Example 1 preparation of blue phosphor
Blue phosphor # 1: (Sr) 2.8 ，Na 0.1 ）MgSi 2 O 7.9 Cl 0.1 ：0.1Eu 2+
41.34g SrCO is weighed 3 ，4.03g MgO，12.02g SiO 2 ，0.584NaCl，1.76g Eu 2 O 3 Mixing uniformly and then filling into a corundum crucible. Placing in a box-type electric furnace, sealing, and introducing flowing mixed gas of nitrogen and hydrogenThe temperature program of the furnace is: the temperature rising rate of the first section at 25-800 ℃ is 8 ℃/min; a second temperature rising stage: a temperature range of 800 ℃ to 1100 ℃ and 5 ℃/min. In the third stage, the temperature rising rate of the temperature range above 1100 ℃ is 5 ℃/min, and the temperature rises to 1350 ℃ and is kept for 5 hours. Naturally cooling to obtain a burning product; and grinding the firing product into powder, washing and drying to obtain the blue fluorescent powder for the LED. Molecular formula (Sr) 2.8 ，Na 0.1 ）MgSi 2 O 7.9 Cl 0.1 ：0.1Eu 2+ The emission wavelength is 460nm.
Blue phosphor # 2: (Sr) 2.45 Ba 0.2 Na 0.2 ) MgSi 1.9 Ge 0.1 O 7.8 Cl 0.2 ：0.15Eu 2+
36.17g SrCO is weighed 3 ，4.03g MgO，11.41g SiO 2 ，1.17NaCl，2.64g Eu 2 O 3 ,1.05g GeO 2 3.95g BaCO 3 Mixing uniformly and then filling into a corundum crucible. Placing the mixture in a box-type electric furnace, introducing flowing mixed gas of nitrogen and hydrogen (hydrogen content is 75%) after sealing, and heating the electric furnace according to the temperature-raising program: the temperature rising rate of the first section at 25-800 ℃ is 15 ℃/min; a second temperature rising stage: a temperature range of 800 ℃ to 1100 ℃ and 5 ℃/min. In the third stage, the temperature rising rate of the temperature range above 1100 ℃ is 4 ℃/min, and the temperature rises to 1150 ℃ and is kept for 10 hours. Naturally cooling to obtain a burning product; and grinding the firing product into powder, washing and drying to obtain the blue fluorescent powder for the LED. Molecular formula (Sr) 2.45 Ba 0.2 Na 0.2 ) MgSi 1.9 Ge 0.1 O 7.8 Cl 0.2 ：0.15Eu 2+ The emission wavelength is 465nm.
3# blue phosphor: (Sr) 2.72 Ba 0.05 Ca 0.05 K 0.08 )MgSi 2 O 7.92 F 0.08 ：0.1Eu 2+
40.15g SrCO was weighed out 3 ，4.03g MgO，12.02g SiO 2 ，0.596KF，1.76g Eu 2 O 3 ，0.5g CaCO 3 0.987g BaCO 3 Mixing uniformly and then filling into a corundum crucible. Electric furnace placed in boxAfter sealing, introducing flowing mixed gas of nitrogen and hydrogen (hydrogen content is 75%), wherein the temperature raising program of the electric furnace is as follows: the temperature rising rate of the first section at 25-800 ℃ is 10 ℃/min; a second temperature rising stage: a temperature range of 800 ℃ to 1100 ℃ and 5 ℃/min. In the third stage, the temperature rising rate of the temperature range above 1100 ℃ is 4 ℃/min, the temperature rises to 1370 ℃ and the temperature is kept for 4 hours. Naturally cooling to obtain a burning product; and grinding the firing product into powder, washing and drying to obtain the blue fluorescent powder for the LED. Molecular formula (Sr) 2.72 Ba 0.05 Ca 0.05 K 0.08 )MgSi 2 O 7.92 F 0.08 ：0.1Eu 2+ The emission wavelength is 470nm.
Blue phosphor No. 4: (Sr) 2.8 ，Na 0.1 ）MgSi 2 O 7.9 Cl 0.1 ：0.1Eu 2+
The preparation method is similar to the preparation method of the No. 1 blue fluorescent powder, and is different in temperature rise program, wherein the temperature rise program is that the temperature rise rate of the first section of the temperature interval of 25-800 ℃ is 10 ℃/min; a second temperature rising stage: a temperature range of 800 ℃ to 1050 ℃ and 5 ℃/min. In the third stage, the temperature rising rate of the temperature range above 1100 ℃ is 6 ℃/min, and the temperature rises to 1350 ℃ and is kept for 5 hours.
Example 2 blue phosphor Spectrum testing
Spectral tests are respectively carried out on the 1# to 4# blue fluorescent powder, and the test results show that the half-peak width of the emission spectrum is in the range of 30nm to 40 nm. Wherein, take 1# to 3# blue phosphor powder as typical representative:
FIG. 2 is a spectrum of blue phosphor # 1 with a visible peak wavelength of 460nm and a half-width of 33nm;
FIG. 3 is a spectrum of the blue phosphor # 2 with a visible spectrum peak wavelength of 465nm and a half-width of 36nm;
FIG. 4 is a spectrum of 3# blue phosphor with a peak wavelength of 470nm and a half-width of 38nm.
Example 3 preparation of blue light emitting device for plant illumination
Preparation of 1# blue light emitting device
According to the mass ratio of 1:1, mixing 1# blue fluorescent powder and organic silica gel to obtain a light conversion layer mixture;
an excitation chip with the excitation wavelength of 410nm is adopted, and the excitation chip is fixed in an inner groove of the bracket;
and coating the obtained light conversion layer mixture around the excitation chip, filling the inner grooves of the bracket, and packaging to obtain the light-emitting device.
Preparation of 2# blue light emitting device
Similar to the preparation of the 1# light emitting device, the difference is that: and adopting the 2# blue fluorescent powder, wherein the proportion of the 2# blue fluorescent powder to the glue is 0.9:1.
preparation of 3# blue light emitting device
Similar to the preparation of the 1# light emitting device, the difference is that: adopting 3# blue fluorescent powder; the proportion of the 3# blue fluorescent powder to the glue is 0.8:1.
example 4 photosynthetic photon flux testing of plant-illuminated blue light emitting devices
The testing method comprises the following steps: the manufacturer of the testing instrument is Hangzhou remote photoelectric limited company, and the model of the testing instrument is HAAS2000 spectrometer.
Test results: the photosynthetic photon flux of the 1# blue light emitting device is 500umol/s;
the photosynthetic photon flux of the 2# blue light emitting device is 420umol/s;
the photosynthetic photon flux of the 3# blue light emitting device is 587umol/s.
Example 5 Effect test of plant illumination blue light emitting device
The blue light emitting devices 1# to 3# are used as blue light sources to carry out illumination treatment on lettuce, the specific method is that the lettuce is irradiated by the light emitting devices with the photon flux of 500umol/s for growth, and the photon flux ratio of blue light, red light and white light is 0.3:0.5:0.2.
test results: the lettuce growth period irradiated by the 1# blue light emitting device is 21 days;
the lettuce growth period irradiated by the No. 2 blue light emitting device is 20 days;
the lettuce growth period irradiated by the 3# blue light emitting device was 21 days.
Comparative example 1 existing blue light chip as light source
The light-emitting device adopts an LED gallium nitride blue light chip as a blue light source, the emission spectrum is shown in figure 5, the peak wavelength is 455nm, and the half width is 19nm. And is designated as a 1# comparison device.
The method for illuminating lettuce by using the contrast 1# light emitting device comprises irradiating lettuce with light emitting device having photon flux of 500umol/s for growth
Test results: lettuce growth cycle was 24 days.
Therefore, the plant illumination blue light emitting device provided by the application is used for carrying out illumination treatment on plants, so that the growth period of the plants can be obviously shortened.
Comparative example 2 existing phosphor as light source
Similar to the preparation method of the 1# blue light emitting device, the difference is that Sr is used 3 MgSi 2 O 8 :Eu 2+ Blue fluorescent powder. An excitation chip with an excitation wavelength of 410nm was used. And is designated as a 2# comparison device.
And carrying out photosynthetic photon flux test on the contrast device, wherein the test result is as follows: the photosynthetic photon flux was 352umol/s.
The luminescence intensity data of example 1 and comparative example 2 are shown in Table 1
TABLE 1
Anti-aging test
The anti-aging property test was conducted on example 1 and comparative example 2, and the test results are shown in table 2.
TABLE 2
The above-described embodiments are merely illustrative of the preferred embodiments of the present application and are not intended to limit the scope of the present application, and various modifications and improvements made by those skilled in the art to the technical solution of the present application should fall within the scope of protection defined by the claims of the present application without departing from the design spirit of the present application.
Claims (10)
1. The plant illumination blue light emitting device is characterized by comprising an excitation chip and a light conversion layer;
the light conversion layer comprises a luminescent material and an organic colloid;
the luminescent material comprises blue fluorescent powder;
the blue fluorescent powder is selected from any one of substances shown in a formula I:
（M 3-a-x ，A a ）Mg（Si 2-b ，D b ）O 8-a E a ：xEu 2+ i
In the formula I, M is selected from at least one of Sr element, ca element and Ba element, and M comprises Sr element;
a is at least one of Na element and K element;
d is selected from Ge element;
e is at least one selected from Cl element and F element;
a is more than or equal to 0.001 and less than or equal to 0.3;
b is more than or equal to 0 and less than or equal to 0.3;
x is more than or equal to 0.001 and less than or equal to 0.4;
the wavelength corresponding to the peak value of the excitation spectrum of the excitation chip is in the range of 410nm to 420 nm;
the peak value of the emission spectrum of the substance shown in the formula I corresponds to the wavelength in the range of 460nm to 470nm.
2. The plant illumination blue light emitting device according to claim 1, wherein the mass ratio of the luminescent material to the organic colloid is 0.5-2: 1.
3. the blue light emitting device for plant illumination according to claim 1, wherein the substance represented by formula i belongs to the group of spaces P21/a.
4. The blue light emitting device for plant illumination according to claim 1, wherein the half-width of the emission spectrum of the substance represented by formula i is in the range of 30nm to 40 nm.
5. The plant-lit blue light emitting device according to claim 1, further comprising a support provided with an inner recess in which the excitation chip is mounted, the light conversion layer also being located in the inner recess and around the excitation chip.
6. The plant-illuminated blue light emitting device of claim 1, wherein the plant-illuminated blue light emitting device illuminates a plant, the plant comprising a crop.
7. The plant-lit blue light emitting device of claim 6, wherein the crop plant comprises any of oil crops, vegetable crops, flowers, grass or trees.
8. The plant-illuminated blue-light emitting device of claim 6, wherein the crop plant comprises any one of lettuce, fruit.
9. A lighting device comprising the plant-illuminated blue light emitting device of any one of claims 1 to 8.
10. Use of a plant-lit blue light emitting device according to any one of claims 1 to 8 in a plant growing process.
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| Synthesis and photoluminescence of the blue phosphor Sr3MgSi2O8:Eu2+ optimized with the Taguchi method for application in near ultraviolet excitable white light-emitting diodes;Pingjuan Zhang et al.;Journal of Luminescence;第169卷;第733-738页 * |
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