JP5917482B2 - LED light source for plant cultivation - Google Patents

Description

  The present invention relates to a light-emitting device that emits light absorbed by plants or algae that require light for growth in order to carry out photosynthesis, and an LED light source for plant cultivation. The present invention relates to a light emitting device for efficiently growing and an LED light source for plant cultivation.

  Conventionally, as an LED light source for plant cultivation that can be used in a plant factory or the like, for example, there is one described in a plant stretching apparatus disclosed in Patent Document 1.

  As shown in FIG. 11, the plant stretching apparatus 100 disclosed in Patent Document 1 has a light emitting unit 110 that emits light for plant stretching and a spectrum of light emitted to the light emitting unit 110. The power supply unit 120 that supplies power in a changeable manner, the determination unit 131 that determines the type of the plant 101 to be grown, and the power supply unit 120 that is controlled according to the type of the plant 101 determined by the determination unit 131 And an optical spectrum setting unit 132 for setting the light spectrum.

  The light emitting unit 110 includes a plurality of types of LEDs 112 that emit different spectrum lights on one surface of the flat substrate 111 so that the light emitted from the LEDs 112 faces the plant 101. is set up. The LED 112 is made of, for example, a cannonball type.

  Moreover, as another conventional LED light source for plant cultivation, for example, the LED light source for plant cultivation disclosed in Patent Document 2 is known.

  The plant cultivation LED light source 200 disclosed in Patent Document 2 can be attached to the lid of a plant culture container, and as shown in FIG. 12, a cathode terminal 201, an anode terminal 202, a light emitting chip 203, It consists of an epoxy resin lens 204. Depending on the type of the light-emitting chip 203, a predetermined color of emitted light 205 is emitted.

JP 2004-344114 A (released on December 9, 2004) Japanese Patent Laid-Open No. 9-252651 (published on September 30, 1997)

  However, in the plant cultivation LED light source 200 shown in FIG. 12 disclosed in the above-mentioned conventional Patent Document 2, as the red LED used for the light source, as described in FIG. Those having a wavelength of 630 nm to 680 nm, preferably an emission peak wavelength of around 660 nm are used. Further, as the blue LED, a LED having a wavelength region of 380 nm to 480 nm, preferably around an emission peak wavelength of 450 nm is used.

  And in patent document 2, the light quantity of blue LED is used so that it may become a ratio of 50% or less in the light quantity of red LED. Here, LED is generally used by mixing red and blue, but depending on the plant, red alone may be used.

However, in the case of using a mixture of red and blue, or in the case of using red alone, there are the following problems.
(1) It is difficult to arrange the red LED and the blue LED for mixed use. Specifically, the installation area is considerably large. In addition, it is difficult to regularly arrange the corners.
(2) Although it is necessary to adjust the light amount ratio between the blue region and the red region, when adjusting the light amount ratio by adjusting the number of blue LEDs or red LEDs, considering the long-term driving, due to the difference in deterioration characteristics Deviation of the light quantity ratio occurs.

Moreover, in order to make the light quantity of blue LED light into the ratio of 50% or less in the light quantity of red LED light,
(A) The red LED emits light with high luminance (increases the drive current).
(B) Increase the number of LED chips mounted on each LED.
(C) Increase the number of red LEDs.
Measures such as these are necessary.

However, in the case of (A), the deterioration characteristic difference between the blue / red LED chips is promoted, and the deviation of the light amount ratio during long-term driving becomes larger. Further, when the light amount is adjusted by an electrical method, it is necessary to install an electric drive circuit or the like, which makes a complicated configuration. In the case of (B), the size of the red LED increases, and problems such as difficulty in controlling wide-angle directivity characteristics arise. In the case of (C), even if the number of blue LEDs is small and evenly arranged, or even if the blue LEDs have wide-angle directional characteristics, the color mixture of red light and blue light is insufficient, resulting in uneven color. There are concerns that are likely to arise.
(3) It is difficult to mix the blue LED and the red LED, and it is difficult to obtain a mixed color necessary for plant cultivation. Specifically, in the case of using a plurality of individual elements of blue LEDs and red LEDs, it is very difficult to satisfy a predetermined light quantity ratio and at the same time realize spatially uniform color mixture with no color unevenness. .

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to emit light that can easily adjust the light quantity ratio between the blue region and the red region with a simple configuration without increasing the installation area. The object is to provide an apparatus and an LED light source for plant cultivation.

In order to solve the above-described problems, the light-emitting device of the present invention includes at least one blue LED chip having a light emission peak in a wavelength range of 400 to 480 nm so as to correspond to the blue region absorption peak of chlorophyll, and the blue LED chip. A red phosphor that emits light having an emission peak wavelength of 620 to 700 nm so as to correspond to the red region absorption peak of chlorophyll by the excitation light from, and a resin layer that covers the blue LED chip and in which the red phosphor is dispersed; The red phosphor emits light having a wavelength of 650 to 660 nm and a light emission peak of CaAlSiN ₃ : Eu and light having a wavelength of 620 to 630 nm (Sr, Ca) AlSiN. ₃ : It is characterized by including Eu.

  The LED light source for plant cultivation of the present invention is characterized by including the above-described light emitting device in order to solve the above problems.

In order to solve the above-described problem, the light emitting device of the present invention has a relative relationship between at least one blue-based first LED chip that emits light in a relatively short wavelength region corresponding to the absorption wavelength of the carotenoid pigment and chlorophyll a. And at least one second LED chip that emits light corresponding to an absorption wavelength in a short wavelength region, and an excitation peak corresponding to an absorption wavelength in a relatively long wavelength region of the chlorophyll a due to excitation light of the second LED chip. And a red phosphor containing CaAlSiN ₃ : Eu that emits light having a wavelength of 650 to 660 nm .

In order to solve the above problems, the light emitting device of the present invention includes at least one blue first LED chip that emits light in a relatively short wavelength region corresponding to the absorption wavelength of the carotenoid pigment, chlorophyll a, and chlorophyll b. A blue LED chip that emits light corresponding to an absorption wavelength in a relatively short wavelength region, and an emission peak corresponding to an absorption wavelength in a relatively long wavelength region of the chlorophyll a by excitation light of the blue LED chip There CaAlSiN ₃ emits light having a wavelength of 650 to 660 nm: emission peak corresponding to the absorption wavelength of a relatively long wavelength region of the Eu and the chlorophyll b emits light of a wavelength of 620~630nm (Sr, Ca) And a red phosphor containing AlSiN ₃ : Eu.

  Advantageous Effects of Invention According to the present invention, there is an effect of providing a light emitting device and an LED light source for plant cultivation that can easily adjust the light amount ratio between the blue region and the red region with a simple configuration without increasing the installation area.

(A) (b) shows one Embodiment of the LED light source for plant cultivation in this invention, Comprising: It is sectional drawing which shows the structure of the LED light source for plant cultivation of a board | substrate type. (A) is a top view which shows the structure before resin layer formation in the LED light source for plant cultivation of the said board | substrate type, (b) is a plane which shows the structure after resin layer formation in the LED light source for plant cultivation of the said board | substrate type. FIG. (A) is a graph which shows the emission spectrum when a compounding ratio is set to resin: red fluorescent substance = 1: 0.05 in the said LED light source for plant cultivation, (b) is a compounding ratio in the said LED light source for plant cultivation. Is a graph showing a light emission spectrum when resin: red phosphor = 1: 0.10. (A) is a graph which shows an emission spectrum when the compounding ratio is resin: red phosphor = 1: 0.15 in the LED light source for plant cultivation, and (b) is a compounding ratio in the LED light source for plant cultivation. Is a graph showing a light emission spectrum when resin: red phosphor = 1: 0.20. It is a figure which shows the application example of the absorption spectrum of a chlorophyll, and the LED light source of this Embodiment. It is a graph which shows the temperature characteristic of the said LED light source in comparison with the past. (A) (b) is a top view which shows the structure of the LED light source for plant cultivation applied for illumination, (c) is a graph which shows the emission spectrum in the said LED light source for plant cultivation. It is explanatory drawing which shows the example applied to the plant factory in the said LED light source for plant cultivation. (A) is sectional drawing which shows a structure when a compounding ratio is set to resin: red fluorescent substance = 1: 0.05 in a bullet-type LED light source for plant cultivation, (b) is a bullet-type LED for plant cultivation. It is sectional drawing which shows a structure when a compounding ratio is set to resin: red fluorescent substance = 1: 0.20 in a light source. (A) shows other one Embodiment of the LED light source for plant cultivation in this invention, Comprising: It is sectional drawing which shows the structure of the LED light source for plant cultivation of a substrate type, (b) is the said board | substrate type | mold. It is a top view which shows the structure before resin layer formation in the LED light source for plant cultivation of. It is a figure which shows the structure of the conventional LED light source for plant cultivation. It is a figure which shows the structure of the other conventional LED light source for plant cultivation.

[Embodiment 1]
One embodiment of the present invention is described below with reference to FIGS.

(Configuration of LED light source for plant cultivation)
The structure of the LED light source for plant cultivation of this Embodiment is demonstrated based on Fig.2 (a) (b). Fig.2 (a) is a top view which shows the LED light source for plant cultivation before inject | pouring red fluorescent substance containing resin, FIG.2 (b) is the LED light source for plant cultivation after inject | pouring red fluorescent substance containing resin. FIG.

  As shown in FIG. 2 (a), a substrate-type LED light source 10 as an LED light source for plant cultivation of the present embodiment has a plurality of blue LED chips 2 mounted on a ceramic substrate 1 as a substrate, and around it. A standing wall 3 made of resin is provided.

  In the present embodiment, the blue LED chips 2 are, for example, electrically connected in series and arranged in series of three, and the blue LED chips 2 are electrically connected in parallel between adjacent columns. Thus, it consists of 24 pieces arranged in 8 rows in parallel. In the present invention, the number of blue LED chips 2 is not necessarily limited to a plurality, and may be one, and the number is not limited to 24. Further, there is no limitation on how to arrange the plurality. The electrical connection method is not limited to this.

  Each of the blue LED chips 2 is connected to the wiring pattern 4a and the wiring pattern 4b provided on both sides of the blue LED chip 2 in each row by a conductive wire 5 inside the standing wall 3. The wiring pattern 4a and the wiring pattern 4b are connected to the cathode electrode land 6a and the anode electrode land 6b mounted on the outside of the standing wall 3 on the ceramic substrate 1, respectively.

  In the substrate-type LED light source 10 of the present embodiment, as shown in FIG. 2B, the resin layer 7 is filled inside the standing wall 3 and covers the upper side of the plurality of blue LED chips 2. In this resin layer 7, red phosphors are mixed and dispersed.

  And the blue LED chip 2 of this Embodiment generate | occur | produces the light of wavelength 400nm -480nm as 1st light corresponding to the blue region absorption peak of chlorophyll. Further, the red phosphor 7b absorbs light of the blue LED chip 2 and emits second light whose emission peak corresponding to the red region absorption peak of chlorophyll is 620 to 700 nm.

  The blue LED chip 2 may output not only the wavelength 400 nm to 480 nm as the first light corresponding to the blue region absorption peak but also the blue ultraviolet region including the ultraviolet color.

(Adjustment of light intensity ratio between blue and red)
A method for adjusting the light quantity ratio between the blue region and the red region in the substrate-type LED light source 10 of the present embodiment will be described with reference to FIGS. FIGS. 1A and 1B are cross-sectional views showing the configurations of substrate-type LED light sources 10 (10A) and 10 (10D) having different blending ratios of red phosphor and silicone resin.

  As shown in FIG. 1A, in the substrate-type LED light source 10 of the present embodiment, the resin layer 7 is made of a resin 7a made of a silicone resin as a resin and containing a red phosphor 7b. Therefore, by changing the ratio of the red phosphor 7b to the resin 7a, light having different wavelengths can be emitted.

For example, CaAlSiN ₃ : Eu is used as the red phosphor 7b, and light having an emission peak in the wavelength range of 400 to 480 nm is emitted from the blue LED chip 2 as described above. Thereby, the 1st light with a wavelength of 400-480 nm and the 2nd light with a wavelength of 620-700 nm are radiate | emitted. CaAlSiN ₃ : Eu is a nitride red phosphor using divalent europium (Eu) as an activator, and is one of phosphors having stable temperature characteristics and high luminous efficiency.

  Specifically, as shown in FIG. 1 (a), in the case of a substrate type LED light source 10A in which the blending ratio is resin 7a: red phosphor 7b = 1: 0.05, it is shown in FIG. 3 (a). Thus, a spectrum having a peak wavelength with an emission intensity of 1.0 at a wavelength of 440 nm and a peak wavelength with an emission intensity of 0.3 at a wavelength of 640 nm is obtained. Further, in the case of the substrate type LED light source 10B in which the blending ratio is resin 7a: red phosphor 7b = 1: 0.10, as shown in FIG. 3B, the peak of emission intensity 1.0 at a wavelength of 440 nm is shown. A spectrum having a wavelength and a peak wavelength with an emission intensity of 0.8 at a wavelength of 640 nm is obtained.

  Further, in the case of the substrate type LED light source 10C in which the blending ratio is resin 7a: red phosphor 7b = 1: 0.15, as shown in FIG. 4A, the peak of emission intensity 0.56 at a wavelength of 440 nm. A spectrum having a wavelength and a peak wavelength with an emission intensity of 1.0 at a wavelength of 640 nm is obtained.

  As shown in FIG. 4B, when the substrate-type LED light source 10D has a blending ratio of resin 7a: red phosphor 7b = 1: 0.20 as shown in FIG. A spectrum having a peak wavelength of emission intensity 0.4 at a wavelength of 440 nm and a peak wavelength of emission intensity of 1.0 at a wavelength of 640 nm is obtained.

  Thus, by changing the blending ratio between the resin 7a and the red phosphor 7b, it is possible to easily adjust the light amount ratio between the blue region and the red region.

(Wavelength of light required for plant growth)
Next, what kind of wavelength light should be irradiated in the growth of a plant is demonstrated based on FIG. FIG. 5 is a diagram showing the light absorption characteristics of chlorophyll and the spectrum of the substrate-type LED light source 10 of the present embodiment.

  First, chlorophyll (chlorophyll), which plays a central role in plant photosynthesis, does not absorb light uniformly, but has clear absorption peaks around red 660 nm and blue 450 nm as shown in FIG. In relation to this, the wavelength characteristic of photosynthesis has a first peak near 660 nm and a second peak near 450 nm.

  Therefore, in a cultivation stage where plants have leaves and photosynthesis is active, having both red and blue light components is effective for growth.

  On the other hand, blue light near 450 nm also affects a photoreaction system called a high energy reaction system of plants, and is essential for the healthy morphogenesis of plants. For this reason, at the stage of germination and seedling raising, the importance of the component of blue light increases.

  On the other hand, in the substrate type LED light source 10 of the present embodiment, as shown in FIG. 5, the substrate type LED light source 10A of the present embodiment is suitable for the blue region absorption band of chlorophyll. It turns out that substrate type LED light source 10D of this Embodiment is suitable for the red region absorption band of chlorophyll.

  Thus, in the substrate type LED light source 10 of this Embodiment, it turns out that it can be easily match | combined with the light absorption characteristic of chlorophyll only by changing the compounding ratio of resin 7a and red fluorescent substance 7b.

  By the way, in the field of light, for example, photon flux density is used as a unit of light quantity. Here, the photon flux density refers to a value obtained by dividing the number of photons irradiated in one second by the light receiving area of the material when a certain material is irradiated with solar light. However, in the case of the photon flux density, since the number of photons is counted, one is one regardless of whether infrared light or ultraviolet light comes. On the other hand, the photochemical reaction is triggered only when photons that can be absorbed by the dye come. For example, in the case of plants, no matter how much light is not absorbed by chlorophyll, it is the same as it does not exist. Therefore, in the field of photosynthesis, photosynthesis effective photon flux density or photosynthesis photon flux only in the wavelength region from 400 nm to 700 nm that can be absorbed by chlorophyll is defined. In addition, a photosynthetic photon flux means a photosynthesis photon flux density (PPFD: photosynthetic photon flux density) multiplied by a light irradiation area. This value is not simply a value expressed by the energy of the absorption peak wavelength in the red region and blue region of chlorophyll, but corresponds to each absorption spectrum in the red region and blue region in order to obtain the light intensity necessary for plant growth. It is a value that expresses energy (that is, energy required for photosynthesis) by the amount of photons. The photosynthetic photon flux can be obtained from the spectral characteristics from the LED light source and the energy of one photon of each wavelength.

  Therefore, when the substrate-type LED light source 10 is expressed using the photosynthetic photon flux, in the substrate-type LED light source 10A shown in FIG. 3A, the photosynthesis photon flux is 1 μmol / s in the blue region having a wavelength of 400 nm to 480 nm. In the red region with a wavelength of 620 nm to 700 nm, it is 1.3 μmol / s. This value is obtained from the area of wavelengths 400 nm to 480 nm and wavelengths 620 nm to 700 nm. When expressed as a ratio, the ratio of the photosynthetic photon flux in the blue region with a wavelength of 400 nm to 480 nm and the photosynthetic photon flux in the red region with a wavelength of 620 nm to 700 nm is 1: 1.3.

  Further, in the substrate type LED light source 10D shown in FIG. 4A, the photosynthetic photon flux is 0.2 μmol / s in the blue region having a wavelength of 400 nm to 480 nm, and 2.0 μmol / s in the red region having a wavelength of 620 nm to 700 nm. s. When this is expressed as a ratio, the ratio of the photosynthetic photon flux in the blue region with a wavelength of 400 nm to 480 nm and the photosynthetic photon flux in the red region with a wavelength of 620 nm to 700 nm is 1:10.

  In the substrate-type LED light source 10B shown in FIG. 3B, the ratio of the photosynthetic photon flux in the blue region with a wavelength of 400 nm to 480 nm and the photosynthetic photon flux in the red region with a wavelength of 620 nm to 700 nm is 1: 3.5. It becomes. In the substrate-type LED light source 10C shown in FIG. 4A, the ratio of the photosynthetic photon flux in the blue region with a wavelength of 400 nm to 480 nm and the photosynthetic photon flux in the red region with a wavelength of 620 nm to 700 nm is 1: 7.5. It becomes.

  Therefore, in this embodiment, the ratio of the photosynthetic photon flux in the blue region with a wavelength of 400 nm to 480 nm and the photosynthetic photon flux in the red region with a wavelength of 620 nm to 700 nm is 1: 1.3 to 1:10. . As a result, it is preferable that the substrate-type LED light source 10 is suitable for plant germination, seedling and cultivation.

  Specifically, when it is intended to be installed on a germination shelf or a seedling shelf, the ratio of the photosynthetic photon flux in the blue region having a wavelength of 400 nm to 480 nm and the photosynthetic photon flux in the red region having a wavelength of 620 nm to 700 nm. However, the substrate-type LED light sources 10A and 10B having a ratio of 1: 1.3 to 1: 3.5 are preferable. Thereby, it can be set as the board | substrate type | mold LED light source 10A * 10B suitable for the germination and raising of a plant.

  Moreover, in this Embodiment, when it aims at installing in a cultivation shelf, ratio of the photosynthetic photon flux in the blue region with a wavelength of 400 nm to 480 nm and the photosynthetic photon flux in the red region with a wavelength of 620 nm to 700 nm However, the board | substrate type LED light sources 10C * 10D used as 1: 7.5-1: 10 are preferable. Thereby, substrate type LED light sources 10C and 10D suitable for plant cultivation can be obtained.

  Moreover, the temperature characteristic in the relative total light flux of the board | substrate type | mold LED light source 10 of this Embodiment and the conventional red LED for plant cultivation is shown in FIG. In FIG. 6, the horizontal axis indicates the junction temperature of the mounted chip, and the vertical axis indicates the relative total luminous flux value. As shown in FIG. 6, the substrate type LED light source 10 (solid line in FIG. 6) and the conventional single red LED for plant cultivation (broken line in FIG. 6) have a temperature characteristic difference of about 10% in the high temperature region. I know that there is. This is because the red LED has poor temperature characteristics. On the other hand, since the substrate type LED light source 10 of the present embodiment is configured by the red phosphor 7b instead of the red LED, the temperature characteristics are improved. As a result, the substrate-type LED light source 10 and the bullet-type LED lamp 40 described later can be adjusted to the light absorption peak of the light absorption characteristics of chlorophyll.

(Material of red phosphor)
Here, in the above description, in the substrate-type LED light source 10 of the present embodiment, CaAlSiN ₃ : Eu is used as the red phosphor 7b. However, the present invention is not limited to this, and, for example, (Sr, Ca) AlSiN ₃ : Eu can also be used. The (Sr, Ca) AlSiN ₃ may, CaAlSiN _3: In Eu, are those obtained by shifting the emission peak wavelength to shorter wavelengths by replacing part of Ca to Sr, CaAlSiN _3: Eu as well as temperature characteristics stable In addition, it is a phosphor with high luminous efficiency.

Specifically, it is preferable to use CaAlSiN ₃ : Eu (emission peak of 650 to 660 nm) as the red phosphor 7b, particularly for plants containing more chlorophyll a than chlorophyll b. For plants containing more chlorophyll b than chlorophyll a, (Sr, Ca) AlSiN ₃ : Eu having an emission peak (620 to 630 nm) on the shorter wavelength side may be used as the red phosphor 7b. preferable.

Further, as the red phosphor 7b, 3.5MgO.0.5MgF ₂ .GeO ₂ : Mn, La ₂ O ₂ S: Eu, Y ₂ O ₂ S: Eu, LiEuW ₂ O ₈ , (Y, Gd, Eu) It is also possible to use ₂ O ₃ , (Y, Gd, Eu) BO ₃ and / or YVO ₄ : Eu, CaS: Eu, Ce, K.

Of course, it goes without saying that two types of red phosphors 7b may be used together, such as using CaAlSiN ₃ : Eu and (Sr, Ca) AlSiN ₃ : Eu. It is effective for cultivation of plants containing half each of chlorophyll a and chlorophyll b.

  Further, the peak wavelength of the blue LED chip 2 may be appropriately selected so as to match the absorption peak of chlorophyll a and chlorophyll b with respect to the light absorption characteristics of the blue region of chlorophyll. For example, a blue LED chip 2 (type I) having a peak at 430 to 440 nm is used in a plant rich in chlorophyll a, and a blue LED chip 2 (type II) having a peak in 450 to 460 nm is used in a plant rich in chlorophyll b. Is preferably used.

Further, a combination of the blue LED chip 2 and the red phosphor 7b may be used as a substrate type LED light source 10 in a combination that matches each type of chlorophyll a and chlorophyll b. For example, a combination of a type I blue LED chip 2 and a red phosphor 7b made of CaAlSiN ₃ : Eu, or a type II blue LED chip 2 and a red phosphor 7b made of (Sr, Ca) AlSiN ₃ : Eu It is possible to set it as the board | substrate type LED light source 10 of each combination structure, such as these combinations.

  In this case, the blending ratio between the resin 7a and the red phosphor 7b is adjusted as appropriate so that a desired light amount ratio is obtained.

(Configuration of board-type LED light source (LED light source for illumination) required for human work)
The board-type LED light source 10 described above is an LED light source for plant cultivation, but the board-type LED light source 10 can be used as an illumination LED light source 20 necessary for human work. Yes, it can be done easily.

  That is, in addition to the configuration of the substrate-type LED light source 10 described above, as shown in FIGS. 7A, 7B, and 7C, the resin layer 7 that covers the upper side of the plurality of blue LED chips 2. In addition to the phosphor 7b, a green phosphor 7c is additionally mixed and dispersed in the resin 7a.

  Specifically, in the illumination LED light source 20, a plurality of blue LED chips 2 are mounted on a ceramic substrate 1, and an upright wall 3 is erected around the chip.

  In the present embodiment, the blue LED chips 2 are composed of, for example, 156 chips that are arranged in twelve in series, but arranged in 13 rows in parallel. In the present invention, the number of blue LED chips 2 is not necessarily limited to a plurality, and may be one, and the number is not limited to 156. Further, there is no limitation on how to arrange the plurality.

  Each of the blue LED chips 2 is electrically connected to the wiring pattern 4a and the wiring pattern 4b provided on both sides of the blue LED chip 2 in each row by a conductive wire 5 inside the standing wall 3. ing. The wiring pattern 4a and the wiring pattern 4b are electrically connected to the cathode electrode land 6a and the anode electrode land 6b mounted on the outside of the standing wall 3 on the ceramic substrate 1, respectively.

  And in the LED light source 20 for illumination of this Embodiment, as shown in FIG.7 (b), the resin layer 7 with which it fills the inner side of the standing wall 3 and coat | covers the upper side of the said several blue LED chip 2 is shown. In this resin layer 7, a red phosphor 7b and a green phosphor 7c are mixed and dispersed in a resin 7a made of a silicone resin.

  Here, in the LED light source 20 for illumination, the compounding ratio of the resin 7a, the red phosphor 7b, and the green phosphor 7c is, for example, 1: 0.01: 0.10. With this blending ratio, the emission spectrum shown in FIG. 7C is obtained. In the emission spectrum shown in FIG. 7C, it can be seen that the amount of light in the vicinity of the wavelength of 550 nm that humans feel most brightly increases. Therefore, it turns out that the LED light source 20 for illumination is effective as an illumination light source for a person to work.

(Application to plant factories)
Next, an application example of the substrate type LED light source 10 of the present embodiment to a plant factory will be described with reference to FIG. FIG. 8 is a diagram showing an example of a plant factory 30 that uses the substrate-type LED light source 10 and the illumination LED light source 20 of the present embodiment.

  In the plant factory 30 of the present embodiment, as shown in FIG. 8, for example, 1300 substrate-type LED light sources 10A are installed on the germination shelf. In addition, 4600 substrate type LED light sources 10A are installed in the seedling rack. Furthermore, 17000 substrate-type LED light sources 10D are installed on the cultivation shelf. In addition, since humans work on the shipping shelf, 370 LED light sources 20 for illumination are installed.

  As described above, the light-emitting device and the substrate-type LED light source 10 according to the present embodiment have a relatively short wavelength range among a plurality of peak wavelengths in light absorbed by plants that require light for growth in order to perform photosynthesis. Blue LED chip 2 as one or a plurality of first LED chips emitting a first short wavelength band light having a wavelength corresponding to a blue band absorption peak of chlorophyll as a first peak wavelength of 400 to 480 nm, and a blue LED chip 2 and a resin layer 7 as a phosphor-containing sealing resin covering 2. The red phosphor 7b as the phosphor contained in the resin layer 7 absorbs the first short wavelength region light emitted from the blue LED chip 2, and thus, more than the first peak wavelength among the plurality of peak wavelengths. A long wavelength region light having a wavelength of 620 to 700 nm corresponding to the red region absorption peak of chlorophyll, which is the peak wavelength of the long wavelength region, is output. Then, the first short wavelength light emitted from the blue LED chip 2 and the long wavelength light emitted from the red phosphor 7b are emitted.

  That is, in order to grow a plant that performs photosynthesis, a light having a first peak wavelength in a relatively short wavelength region and a peak wavelength in a longer wavelength region than the first peak wavelength is often required. Therefore, in the present embodiment, one or a plurality of blue LED chips 2 emitting a first short wavelength band light corresponding to the first peak wavelength, and a resin layer 7 covering the blue LED chip 2 are provided. And the red fluorescent substance 7b contained in the resin layer 7 emits the long wavelength region light corresponding to the peak wavelength in the longer wavelength region than the first peak wavelength.

  As a result, a blue region such as chlorophyll necessary for the growth of organisms such as plants can be obtained with one blue LED chip without using two types of LED chips, an independent blue LED chip and an independent red LED chip. Light corresponding to the absorption peak and the red region absorption peak can be emitted. For this reason, an installation area is not increased. In this configuration, since the red phosphor is dispersed in the resin layer, the red phosphor can be dispersed in the resin at a predetermined blending ratio. The amount of light in the red region can be changed.

  Accordingly, it is possible to easily adjust the light quantity ratio between the blue color region and the red color region with a simple configuration without increasing the installation area, and at the same time, it is possible to emit a mixed color light of blue light and red light with little spatial color unevenness. The light emitting device and the substrate type LED light source 10 can be provided.

  Further, the substrate-type LED light source 10 of the present embodiment includes one or a plurality of blue LED chips 2 having a light emission peak in a wavelength range of 400 to 480 nm to correspond to a blue region absorption peak of chlorophyll, and a blue LED. The red phosphor 7b that emits light having an emission peak wavelength of 620 to 700 nm corresponding to the red region absorption peak of chlorophyll by the excitation light from the chip 2 and the red phosphor 7b are dispersed and one or more of the above. A resin layer 7 covering the blue LED chip 2, and the blue light emitted from the blue LED chip 2 and the light having an emission peak wavelength of 620 to 700 nm to correspond to the red region absorption peak of the chlorophyll. It is emitted from the layer 7.

  According to said structure, the LED light source for plant cultivation consists of the resin layer 7 which disperse | distributed the 1 or several blue LED chip 2 and the red fluorescent substance 7b which covers this blue LED chip 2. FIG. In this configuration, the blue LED chip 2 can output light in the wavelength range of 400 to 480 nm so as to correspond to the blue region absorption peak of chlorophyll. The red phosphor 7b emits light having an emission peak wavelength of 620 to 700 nm to correspond to the red region absorption peak of chlorophyll by the excitation light from the blue LED chip 2.

  As a result, the blue region absorption peak of chlorophyll necessary for plant growth with one type of blue LED chip 2 without using two types of LED chips, that is, an independent blue LED chip 2 and an independent red LED chip. And light corresponding to the red region absorption peak can be emitted. For this reason, an installation area is not increased. In this configuration, since the red phosphor 7b is dispersed in the resin layer, the red phosphor 7b can be dispersed in the resin at a predetermined blending ratio. The amount of light in the area and the red area can be changed.

  Accordingly, it is possible to easily adjust the light quantity ratio between the blue color region and the red color region with a simple configuration without increasing the installation area, and at the same time, it is possible to emit a mixed color light of blue light and red light with little spatial color unevenness. An LED light source for plant cultivation can be provided.

  Further, in the substrate-type LED light source 10 of the present embodiment, the ratio of the photosynthetic photon flux in the blue region with a wavelength of 400 nm to 480 nm and the photosynthetic photon flux in the red region with a wavelength of 620 nm to 700 nm is 1: 1.3-1. : 10 is preferable. As a result, it is possible to obtain a substrate-type LED light source 10 suitable for plant germination, seedling and cultivation.

  Moreover, in the board | substrate type LED light source 10 of this Embodiment, the compounding ratio of resin 7a and the red fluorescent substance 7b in the resin layer 7 is 1: 0.05-1: 0.20. As a result, it is possible to obtain a substrate-type LED light source 10 suitable for plant germination, seedling and cultivation.

  Moreover, in the board | substrate type LED light source 10 of this Embodiment, when aiming at installing in a germination shelf or a seedling shelf, the compounding ratio of resin 7a and red fluorescent substance 7b in the resin layer 7 is 1: It is preferable that it is 0.05-1: 0.10.

  That is, chlorophyll (chlorophyll), which plays a central role in plant photosynthesis, does not absorb light uniformly, but shows clear absorption peaks near red 660 nm and blue 450 nm, and photosynthesis is related to this. The wavelength characteristic has a first peak near 660 nm and a second peak near 450 nm. In other words, at the cultivation stage where leaves are provided and photosynthesis is active, having both blue and red light components is effective for growth. On the other hand, blue light in the vicinity of 450 nm also affects a photoreaction system called a high energy reaction system of plants, and is essential for the healthy morphogenesis of plants. Therefore, the importance of the blue light component increases at the germination and seedling stage.

  In this regard, in the present embodiment, the compounding ratio of the resin 7a and the red phosphor 7b in the resin layer 7 is 1: 0.05 to 1: 0.10. For this reason, by using this blending ratio, it is possible to provide the substrate-type LED light source 10 that easily emits the light of the blue light component that is indispensable for the healthy morphogenesis of plants at the stage of germination and seedling raising. .

  Moreover, in the board | substrate type LED light source 10 of this Embodiment, when it aims at installing in a cultivation shelf, the compounding ratio of resin 7a and red fluorescent substance 7b in the resin layer 7 is 1: 0.15. It is ˜1: 0.20. Thereby, the board | substrate type | mold LED light source 10 which radiate | emits the light which has both a blue and red light component easily can be provided in the cultivation stage in which photosynthesis becomes active with a leaf.

  Moreover, in the board | substrate type LED light source 10 of this Embodiment, when aiming at installing in a germination shelf or a seedling raising shelf, photosynthetic photon flux in a blue region with a wavelength of 400 nm to 480 nm and a wavelength of 620 nm to 700 nm The ratio with the photosynthetic photon flux in the red region is preferably 1: 1.3 to 1: 3.5. Thereby, it becomes possible to set it as the board | substrate type | mold LED light source 10 suitable for the germination and seedling raising of a plant.

  Moreover, in the board | substrate type LED light source 10 of this Embodiment, when aiming at installing in a cultivation shelf, in the red region of wavelength 620nm-700nm, the photosynthetic photon flux in the blue region of wavelength 400nm -480nm The ratio to the photosynthetic photon flux is preferably 1: 7.5 to 1:10. Thereby, it becomes possible to make the substrate type LED light source 10 suitable for plant cultivation.

Further, in the substrate-type LED light source 10 of the present embodiment, the red phosphor 7b is a plant cultivation rich in chlorophyll a than chlorophyll b is CaAlSiN _3: it has become a Eu system components preferable.

  That is, the plant has chlorophyll a and chlorophyll b. Here, chlorophyll a and chlorophyll b have different light absorption characteristics. Specifically, chlorophyll a has an absorption peak at 650 to 660 nm in the red region, and chlorophyll b has an absorption peak at 620 to 630 nm in the red region.

Therefore, in the present embodiment, the red phosphor 7b has a CaAlSiN ₃ : Eu component for plant cultivation containing more chlorophyll a than chlorophyll b. That is, a red phosphor having a CaAlSiN ₃ : Eu-based component can emit a wavelength having an emission peak of 650 to 660 nm.

Therefore, it is preferable to use the red phosphor 7b having a CaAlSiN ₃ : Eu-based component for plant cultivation containing more chlorophyll a than chlorophyll b.

Further, in the substrate-type LED light source 10 of the present embodiment, the red phosphor 7b is a plant cultivation rich in chlorophyll b than chlorophyll a _{is, (Sr, Ca) AlSiN 3} : a Eu system components It is preferable that

That is, chlorophyll b has an absorption peak at 620 to 630 nm in the red region, and a red phosphor having a (Sr, Ca) AlSiN ₃ : Eu-based component emits a wavelength with an emission peak of 620 to 630 nm. be able to.

Therefore, for plant cultivation containing more chlorophyll b than chlorophyll a, it is preferable to use red phosphor 7b having a (Sr, Ca) AlSiN ₃ : Eu-based component.

  Further, in the substrate-type LED light source 10 of the present embodiment, a plurality of blue LED chips 2 are mounted on the ceramic substrate 1, a standing wall 3 is provided around the blue LED chip 2, and inside the standing wall 3. Is filled with a resin 7a in which a red phosphor 7b is dispersed.

  Thereby, it can be set as the structure of what is called a board | substrate type board | substrate type | mold LED light source 10. FIG. In this configuration, since a plurality of blue LED chips 2 are used for one substrate-type LED light source 10, a large amount of light can be emitted from one substrate-type LED light source 10. Further, since the red phosphor 7b dispersed in the resin 7a is used instead of the red LED chip, the installation area corresponding to the plurality of red LED chips corresponding to the plurality of blue LED chips 2 can be greatly reduced. Can do.

  Therefore, it is possible to emit a large amount of light with a small installation area by one substrate type LED light source 10.

  In the substrate-type LED light source 10 of the present embodiment, first light having a wavelength of 400 to 480 nm and second light having a wavelength of 620 to 700 nm are emitted from the resin layer 7.

  Thereby, both the blue and red peaks necessary for plant growth can be generated by one substrate type LED light source 10. Thus, by using one substrate-type LED light source 10, the installation area of the substrate-type LED light source 10 can be reduced, the reliability is increased, and the light source is suitable for use in a plant factory or the like. it can.

  Moreover, in the board | substrate type LED light source 10 of this Embodiment, 1st light is the light from the blue LED chip 2, and 2nd light is the light discharge | released from the red fluorescent substance 7b. That is, in the substrate-type LED light source 10, a light absorption peak of light absorption characteristics of chlorophyll is generated in the vicinity of the light emitting portion. From this, the 1st light and 2nd light from the board | substrate type LED light source 10 are irradiated uniformly. That is, in the substrate-type LED light source 10, a light absorption peak of light absorption characteristics of chlorophyll is generated in the vicinity of the light emitting portion. From this, the 1st light and 2nd light from the board | substrate type LED light source 10 are irradiated uniformly.

  Specifically, a part of the first light emitted from the blue LED chip 2 is absorbed by the red phosphor 7b, the second light is emitted from the red phosphor 7b, and the rest is scattered by the red phosphor 7b. Is done. Since each of the red phosphors 7b is a point light source, blue light or red light is emitted uniformly.

  As a result, both blue and red peaks necessary for plant growth can be generated by one substrate type LED light source 10. Thus, by using one substrate-type LED light source 10, the installation area of the substrate-type LED light source 10 can be reduced, the reliability is increased, and the light source is suitable for use in a plant factory or the like. it can.

  Moreover, the plant factory 30 of this Embodiment is provided with the said board | substrate type LED light source 10A and / or the board | substrate type LED light source 10B, the board | substrate type LED light source 10C, and / or the board | substrate type LED light source 10D.

  Therefore, it is possible to provide the plant factory 30 including the substrate-type LED light source 10 that can easily adjust the light quantity ratio between the blue region and the red region with a simple configuration without increasing the installation area.

  In addition, this invention is not limited to said embodiment, A various change is possible within the scope of the present invention.

  For example, in FIGS. 1A and 1B, nothing is provided on the back surface of the ceramic substrate 1, but the present invention is not limited to this. For example, a finned heat sink can be attached to the back side of the ceramic substrate 1 that also serves as a heat sink of the substrate-type LED light source 10, that is, the side opposite to the surface on which the blue LED chip 2 is mounted. Thereby, it becomes possible to cool the ceramic substrate 1 with the heat sink with a fin by utilizing an air flow in the room of a plant factory. In this case, the opening of the finned heat sink is preferably in the same direction as the air flow direction.

  Moreover, it is also possible to adopt a configuration in which a tube for circulating the liquid culture solution is provided on the back surface of the ceramic substrate 1. Thereby, it becomes possible to cool the board | substrate type | mold LED light source 10 suitably, and 1st light and 2nd light which match the light absorption peak of the light absorption characteristic of the stable chlorophyll can be irradiated.

  Thus, in the board | substrate type LED light source 10 of this Embodiment, it is preferable that the heat sink with a fin as a cooling means is provided in the back surface of the ceramic substrate 1. FIG.

  Thereby, it becomes possible to cool blue LED chip 2 which became high temperature.

[Embodiment 2]
The following will describe another embodiment of the present invention with reference to FIG. The configurations other than those described in the present embodiment are the same as those in the first embodiment. For convenience of explanation, members having the same functions as those shown in the drawings of the first embodiment are given the same reference numerals, and explanation thereof is omitted.

  The substrate-type LED light source 10 and the illumination LED light source 20 described in the first embodiment consist of one or more blue LED chips 2 mounted on the ceramic substrate 1. However, as shown in FIGS. 9 (a) and 9 (b), the LED light source for plant cultivation according to the present embodiment is different in that the shape has a general bullet-shaped form.

  The structure of the LED light source for plant cultivation of this Embodiment is demonstrated based on Fig.9 (a) (b). FIGS. 9A and 9B are schematic cross-sectional views showing the configuration of a bullet-type LED lamp.

As shown in FIGS. 9 (a) and 9 (b), a bullet-type LED lamp 40 as an LED light source for plant cultivation according to the present embodiment includes a blue LED chip 2 adhered in a mount lead cup 41 as a cup, Resin layer 7 made of silicone resin 7a and red phosphor 7b, conductive wire 5 as a conducting wire, anode lead frame 42 as an anode lead, cathode lead frame 43 as a cathode lead, and a shell type A sealing resin 44 made of an epoxy resin that is formed and sealed in a bullet shape except for the tips of the anode lead frame 42 and the cathode lead frame 43 is formed. For example, CaAlSiN ₃ : Eu can be used as the red phosphor 7b.

  When manufacturing the bullet-type LED lamp 40, the blue LED chip 2 is bonded in the mount lead cup 41. Next, the blue LED chip 2 and the mount lead (not shown), and the blue LED chip 2 and the inner lead (not shown) are electrically connected by the conductive wire 5. Thereafter, the red phosphor 7 b is mixed and dispersed in the resin 7 a and poured into the mount lead cup 41 to form the resin layer 7. As a result, the blue LED chip 2 is covered and fixed by the resin layer 7. Finally, the whole is covered and protected with a mold member made of an epoxy resin sealing resin 44.

  In the bullet type LED lamp 40, the blue LED chip 2 generates light having a wavelength of 400 nm to 480 nm as the first light. This first light corresponds to the blue region absorption peak of chlorophyll. On the other hand, the red phosphor 7b absorbs the light of the blue LED chip 2 and emits second light having an emission peak wavelength of 620 to 700 nm. This second light corresponds to the red region absorption peak of chlorophyll.

  In this embodiment, in the bullet-type LED lamp 40 of this embodiment shown in FIG. 9A, a bullet-type LED lamp in which the mixing ratio of the resin 7a and the red phosphor 7b is 1: 0.05. The spectrum shown in FIG. 3A is the same as that of the substrate-type LED light source 10A of the first embodiment. Therefore, the bullet-type LED lamp 40A corresponds to the blue region absorption peak of chlorophyll, and is preferably used for germination and raising seedlings. However, the present invention is not limited to this, and it is also possible to use a bullet-type LED lamp 40 in which the blending ratio of the resin 7a and the red phosphor 7b is 1: 0.10 to 1: 0.15.

  On the other hand, the bullet-type LED lamp 40 shown in FIG. 9B is a bullet-type LED lamp 40D in which the blending ratio of the resin 7a and the red phosphor 7b is 1: 0.20. Therefore, this bullet-type LED lamp 40D outputs the spectrum shown in FIG. 4B which is the same as the substrate-type LED light source 10D of the first embodiment. Thereby, bullet-type LED lamp 40D respond | corresponds to the red region absorption peak of chlorophyll, and it is preferable to use it for cultivation.

  Such a bullet-type LED lamp 40 is attached to a place where it is difficult to attach the substrate-type LED light source 10 in which the blue LED chip 2 is mounted on the ceramic substrate 1 described in the first embodiment. From this, it is considered that there are few places where it is difficult to attach the substrate-type LED light source 10, so the substrate-type LED light source 10 of the first embodiment and the bullet-type LED lamp 40 of the second embodiment are used in combination. Also good.

  Finally, Table 1 compares the substrate-type LED light source 10 of the first embodiment, the bullet-type LED lamp 40 of the second embodiment, and a combination of a conventional red-ball-type LED lamp and a blue-ball-type LED lamp. Show.

  As shown in Table 1, the board-type LED light source 10 according to the first embodiment and the bullet-type LED lamp 40 according to the second embodiment are a combination of a conventional red bullet-type LED lamp and a blue bullet-type LED lamp. It is understood that it is superior in all points of reliability, cost, characteristics, installation area, and life compared with the product.

  Specifically, regarding the installation area, when the installation area when combining the conventional artillery-type LED and the red-type bullet-type LED is 1, it is 1/3 for the bullet-type LED lamp 40, and the board-type LED In the light source 10 and the LED light source 20 for illumination, it becomes 1/6. For this reason, the board-type LED light source 10, the illumination LED light source 20, and the bullet-type LED lamp 40 according to the present embodiment have a feature that an installation area is small.

  Further, with respect to the cost, it is clear that the board-type LED light source 10, the illumination LED light source 20, and the bullet-type LED lamp 40 of the present embodiment have a cost merit compared to the conventional case.

  Furthermore, the lifespan of the substrate-type LED light source 10 and the illumination LED light source 20 is 3 to 40,000 hours, not to mention electric heating lamps (bulb bulbs), and are ten times longer than that of fluorescent lamps. .

  As described above, in the cannonball type LED lamp 40 as the LED light source for plant cultivation of the present embodiment, the cathode lead frame 43, the mount lead cup 41 connected to the cathode lead frame 43, and the mount lead cup 41 are mounted. In the mount lead cup 41, one or a plurality of blue LED chips 2, the anode lead frame 42 connected from the blue LED chip 2 mounted in the mount lead cup 41 via the conductive wire 5, and the mount lead cup 41. The entire mount lead cup 41 with the resin layer 7 dispersed so as to cover the blue LED chip 2 and the red phosphor 7b dispersed therein and the ends of the cathode lead frame 43 and the anode lead frame 42 are exposed. And a sealing resin 44 that is sealed in a bullet shape, and the first peak wave from the blue LED chip 2 A first long wavelength area light corresponding to the peak wavelength of the short wavelength area and red phosphor 7b is emitted from the resin layer 7 corresponding to.

  Thereby, it can be set as what is called a bullet-type bullet-type LED lamp 40. FIG. And since such a bullet-type bullet-type LED lamp 40 has a small installation area, it is suitable for spot cultivation in plant cultivation.

[Embodiment 3]
The following will describe another embodiment of the present invention with reference to FIG. The configurations other than those described in the present embodiment are the same as those in the first embodiment and the second embodiment. For convenience of explanation, members having the same functions as those shown in the drawings of Embodiment 1 and Embodiment 2 are given the same reference numerals, and explanation thereof is omitted.

  The substrate-type LED light source 10 described in the first embodiment and the bullet-type LED lamp 40 described in the second embodiment emit light in the wavelength range of 400 to 480 nm to correspond to the blue region absorption peak of chlorophyll. It had one or more blue LED chips with peaks.

  However, in the LED light source for plant cultivation of the present embodiment, the blue LED chip is a plurality of blue LED chips for chlorophyll a having a light emission peak in the wavelength range of 400 to 450 nm to correspond to the blue region absorption peak of chlorophyll a. And a plurality of blue LED chips for chlorophyll b having a light emission peak in a wavelength range of 400 to 480 nm so as to correspond to a blue region absorption peak of chlorophyll b.

  That is, a substrate-type LED light source 50 as an LED light source for plant cultivation according to the present embodiment has a plurality of blue LED chips 2 and blue LED chips 52 on a ceramic substrate 1 as a substrate, as shown in FIG. And a standing wall 3 made of resin is provided around the periphery.

  As shown in FIG. 10B, each of the blue LED chips 2 and the blue LED chips 52 has a wiring pattern 4a provided on both sides of the blue LED chips 2 and 52 in each row inside the standing wall 3. Are connected to the wiring pattern 4b by conductive wires 5, respectively. The wiring pattern 4a and the wiring pattern 4b are connected to the cathode electrode land 6a and the anode electrode land 6b mounted on the outside of the standing wall 3 on the ceramic substrate 1, respectively.

  As shown in FIG. 10A, a resin layer 7 that covers the upper side of the plurality of blue LED chips 2, 52 is provided inside the standing wall 3. The resin layer 7 is made of a resin 7a filled with a red phosphor 7b mixed and dispersed.

  And the blue LED chip 2 of this Embodiment generate | occur | produces the light with a blue region long wavelength of wavelength 400nm -480nm as 1st light corresponding to the blue region absorption peak of chlorophyll b. Therefore, the blue LED chip 2 for long wavelength in the blue region functions as the blue LED chip for chlorophyll b of the present invention.

  On the other hand, the blue LED chip 52 of the present embodiment generates light having a short wavelength in the blue region of wavelength 400 nm to 450 nm as the first light corresponding to the blue region absorption peak of chlorophyll a. Accordingly, the blue LED chip 52 for short wavelength in the blue region functions as the blue LED chip for chlorophyll a of the present invention.

  Further, the red phosphor 7b absorbs light of the blue LED chip 2 and the blue LED chip 52 and emits second light whose emission peak corresponding to the red region absorption peak of chlorophyll a and chlorophyll b is 620 to 700 nm. It has become a thing.

  That is, the plant has chlorophyll a and chlorophyll b. Here, chlorophyll a and chlorophyll b have different light absorption characteristics in the blue region. Specifically, as shown in FIG. 5 described in the first embodiment, chlorophyll a has an absorption peak at 400 to 450 nm in the blue region, and chlorophyll b has an absorption peak at 400 to 480 nm in the blue region. have.

  Therefore, in the substrate-type LED light source 50 as the LED light source for plant cultivation of the present embodiment, the blue LED chip has a plurality of emission peaks in the wavelength range of 400 to 450 nm to correspond to the blue region absorption peak of chlorophyll a. Blue LED chip 52 for blue wavelength short wavelength as blue LED chip for chlorophyll a, and a plurality of blue colors for chlorophyll b having a light emission peak in the range of 400 to 480 nm to correspond to the blue wavelength absorption peak of chlorophyll b It consists of a blue LED chip 2 for long wavelength blue region as an LED chip. Then, blue light emitted from the plurality of blue LED chips 52.2 and light having an emission peak wavelength of 620 to 700 nm are emitted from the resin layer 7 so as to correspond to the red region absorption peak of the chlorophyll.

  As a result, it is possible to provide a plant cultivation LED light source more suitable for plants having chlorophyll a and chlorophyll b.

  In addition, in said description, the board | substrate type LED light source 50 as an LED light source for plant cultivation which changed the structure of the board | substrate type LED light source 10 was demonstrated. However, the LED light source for plant cultivation of the present invention is not necessarily limited to this, and can also be applied to a bullet-type LED lamp in which the configuration of the bullet-type LED lamp 40 described in the second embodiment is partially changed. .

[Embodiment 4]
The following will describe still another embodiment of the present invention. The configurations other than those described in the present embodiment are the same as those in the first to third embodiments. For convenience of explanation, members having the same functions as those shown in the drawings of Embodiments 1 to 3 are given the same reference numerals, and descriptions thereof are omitted.

  In the first to third embodiments, the LED light source for plant cultivation for plants that require light for growth to perform photosynthesis has been described. However, the light-emitting device of the present invention is not limited to plants, but can also target algae that require light for growth in order to perform photosynthesis. Therefore, in this embodiment, application to algae that perform photosynthesis will be described.

  That is, chlorophyll pigment-based chlorophyll c, bacteriochlorophyll a (835 nm), and carotenoid pigment-based β-carotene (446 nm), lutein, fucoxanthin (453 nm), and phycopyrine pigment as pigments in addition to chlorophyll a and b for photosynthesis Systemic and phycocyanin (612 nm), phycoerythrin (540 nm). The numerical value in parentheses is the wavelength of the absorption peak. As described above, bacteriochlorophyll has an absorption peak at 800 nm or more.

  Here, various algae specifically have the following pigments.

  First, diatoms have chlorophyll a and fucoxanthin (453 nm) as main pigments. As described above, the chlorophyll a has an absorption peak at 400 to 450 nm in the blue region, and has an absorption peak at 650 to 660 nm in the red region.

  Therefore, in this case, the first peak wavelength of 453 nm of fucoxanthin, which is a relatively short wavelength region, among the plurality of peak wavelengths in light absorbed by diatoms that require light for growth in order to carry out photosynthesis corresponds to A blue LED chip serving as one or a plurality of first LED chips emitting first short-wavelength light; and a phosphor-containing sealing resin that covers the blue LED chip; The red phosphor as the phosphor contained in the stop resin absorbs the first short wavelength region light emitted from the blue LED chip, so that the first peak wavelength 453 nm is more than the first peak wavelength 453 nm among the plurality of peak wavelengths. It is preferable that the light emitting device emit light having a long wavelength region corresponding to a peak wavelength of 650 to 660 nm of chlorophyll a in the long wavelength region. Thereby, the growth of diatom can be promoted.

  Further, in the case of diatoms, the second peak wavelength of 400 to 450 nm of chlorophyll a which is a relatively short wavelength peak wavelength and is different from the first peak wavelength 453 nm of fucoxanthin among a plurality of peak wavelengths. It is possible to provide one or a plurality of second LED chips that emit corresponding second short wavelength light. Thereby, the growth of diatom can be further promoted.

  Next, green algae has chlorophyll a and b and β-carotene (446 nm) as main pigments. As described above, chlorophyll a has an absorption peak at 400 to 450 nm in the blue region, and an absorption peak at 650 to 660 nm in the red region. Chlorophyll b has an absorption peak at 400 to 480 nm in the blue region, and an absorption peak at 620 to 630 nm in the red region.

  Therefore, in this case, the first peak wavelength corresponding to the first peak wavelength of 446 nm of β-carotene, which is a relatively short wavelength region, among the plurality of peak wavelengths in light absorbed by the green algae that needs light for growth to perform photosynthesis. 1. A blue LED chip as one or a plurality of first LED chips that emit light in a short wavelength region, and a phosphor-containing sealing resin that covers the blue LED chip, and the phosphor-containing sealing The red phosphor as the phosphor contained in the resin absorbs the first short wavelength band light emitted from the blue LED chip, and is longer than the first peak wavelength 446 nm among the plurality of peak wavelengths. The light emitting device emits light in a long wavelength region corresponding to a peak wavelength of 650 to 660 nm of chlorophyll a and a peak wavelength of 620 to 630 nm of chlorophyll b. Preferred. Thereby, the growth of green algae can be promoted.

  Next, cyanobacteria have chlorophyll a and phycocyanin (612 nm) as main pigments. As described above, the chlorophyll a has an absorption peak at 400 to 450 nm in the blue region.

  Therefore, in this case, the first peak wavelength of 400 to 450 nm of chlorophyll a, which is a relatively short wavelength region, among a plurality of peak wavelengths in light absorbed by cyanobacteria that require light for growth in order to perform photosynthesis. The phosphor includes a blue LED chip as one or a plurality of first LED chips emitting a corresponding first short wavelength band light, and a phosphor-containing sealing resin that covers the blue LED chip. The red phosphor as the phosphor contained in the encapsulating resin absorbs the first short wavelength band light emitted from the blue LED chip, and thus the first peak wavelength 400 of the plurality of peak wavelengths. It is preferable that the light emitting device emit light having a long wavelength region corresponding to a peak wavelength of 612 nm of phycocyanin having a wavelength region longer than ˜450 nm. Thereby, the growth of cyanobacteria can be promoted.

  In this case, it is also possible to use a blue LED chip that matches the absorption peak wavelength of the red phosphor.

  That is, first, a first blue LED chip as one or a plurality of first LED chips emitting a first short wavelength region light corresponding to a first peak wavelength of 400 to 450 nm of chlorophyll a which is a relatively short wavelength region. And a phosphor-containing sealing resin that covers the first blue LED chip, and a first red phosphor as a phosphor contained in the phosphor-containing sealing resin is the first blue phosphor By absorbing the first short wavelength region light emitted from the LED chip, the peak wavelength of chlorophyll a in the longer wavelength region than the first peak wavelength of 400 to 450 nm among the plurality of peak wavelengths corresponds to 650 to 660 nm. Emits long wavelength light.

  Next, one or a plurality of light emitting second short-wavelength light corresponding to a second peak wavelength that is a relatively short-wavelength peak wavelength and different from the first peak wavelength 400 to 450 nm of chlorophyll a A second blue LED chip as a second LED chip is provided.

  In the second blue LED chip, the second red phosphor as the phosphor contained in the phosphor-containing sealing resin absorbs the first short wavelength region light emitted from the second blue LED chip. Thus, among the plurality of peak wavelengths, light having a long wavelength region corresponding to the peak wavelength 612 nm of phycocyanin having a longer wavelength region than the first peak wavelength 400 to 450 nm is emitted.

  Accordingly, the first red phosphor of the first blue LED chip that emits the first short wavelength band light cannot emit the long wavelength band light corresponding to the peak wavelength 612 nm of the relatively long wavelength phycocyanin. In this case, by using the second blue LED chip that emits the second short-wavelength light, the second red phosphor can emit the long-wavelength light corresponding to the peak wavelength of phycocyanin of 612 nm. .

  As a result, light in the red wavelength region having a higher emission intensity than phycocyanin is emitted from the light emitting device, and the growth of cyanobacteria is improved.

  In addition, such a method can be used not only for cyanobacterium but also for cultivation and culture of other organisms.

  By using such a light-emitting device, the growth of algae such as diatoms, green algae, and cyanobacterium can be promoted by irradiating algae such as diatoms, green algae, and cyanobacterium with the light-emitting device.

  Also, even if two types of LED chips, an independent blue LED chip and an independent red LED chip, are not used, one blue LED chip absorbs a blue region such as chlorophyll necessary for the growth of algae and other organisms. Light corresponding to the peak and the red region absorption peak can be emitted. For this reason, an installation area is not increased. In this configuration, since the red phosphor is dispersed in the resin layer, the red phosphor can be dispersed in the resin at a predetermined blending ratio. The amount of light in the red region can be changed.

  Accordingly, it is possible to easily adjust the light quantity ratio between the blue color region and the red color region with a simple configuration without increasing the installation area, and at the same time, it is possible to emit a mixed color light of blue light and red light with little spatial color unevenness. A light-emitting device can be provided.

  In the light emitting device of the present embodiment, the second short wavelength band light corresponding to the second peak wavelength which is a relatively short peak wavelength among the plurality of peak wavelengths and is different from the first peak wavelength. One or a plurality of second LED chips that emit light can be provided.

  As a result, it is possible to provide a light-emitting device that appropriately promotes the growth of organisms such as algae even when there are two types of peak wavelengths in the relatively short wavelength range, the first peak wavelength and the second peak wavelength. .

  As described above, in the plant cultivation LED light source of the present invention, the second peak wavelength that is the peak wavelength in the relatively short wavelength region and is different from the first peak wavelength among the plurality of peak wavelengths. The first short wavelength band light emitted from the first LED chip and the second short wavelength band light emitted from the second LED chip. And the first short wavelength light emitted from the first LED chip and the long wavelength light emitted from the phosphor by the second short wavelength light emitted from the second LED chip. .

  As a result, even when there are two types of peak wavelengths in the relatively short wavelength range, the first peak wavelength and the second peak wavelength, an LED light source for plant cultivation that appropriately promotes the growth of organisms such as plants and algae is provided. Can be provided.

  In the LED light source for plant cultivation of the present invention, one or a plurality of blue LED chips having an emission peak in the wavelength range of 400 to 480 nm to correspond to the blue region absorption peak of chlorophyll, and excitation from the blue LED chip A red phosphor that emits light having an emission peak wavelength of 620 to 700 nm corresponding to the red region absorption peak of chlorophyll by light and a resin layer that disperses the red phosphor and covers the blue LED chip are provided. The blue light emitted from the blue LED chip and the light having an emission peak with a wavelength of 620 to 700 nm corresponding to the red region absorption peak of the chlorophyll can be emitted from the resin layer.

  According to said invention, the LED light source for plant cultivation consists of the resin layer which disperse | distributed the 1 or several blue LED chip and the red fluorescent substance which covers this blue LED chip. In this configuration, the blue LED chip can output light in the wavelength range of 400 to 480 nm so as to correspond to the blue region absorption peak of chlorophyll. The red phosphor emits light having an emission peak wavelength of 620 to 700 nm so as to correspond to the red region absorption peak of chlorophyll by excitation light from the blue LED chip.

  As a result, even if two types of LED chips, that is, an independent blue LED chip and an independent red LED chip are not used, the blue region absorption peak and red color of chlorophyll necessary for plant growth with one type of blue LED chip. Light corresponding to the band absorption peak can be emitted. For this reason, an installation area is not increased. In this configuration, since the red phosphor is dispersed in the resin layer, the red phosphor can be dispersed in the resin at a predetermined blending ratio. The amount of light in the red region can be changed.

  Accordingly, it is possible to easily adjust the light quantity ratio between the blue color region and the red color region with a simple configuration without increasing the installation area, and at the same time, it is possible to emit a mixed color light of blue light and red light with little spatial color unevenness. An LED light source for plant cultivation can be provided.

  In the LED light source for plant cultivation of the present invention, the blue LED chip is one or a plurality of blue LEDs for chlorophyll a having a light emission peak in a wavelength range of 400 to 450 nm so as to correspond to the blue region absorption peak of chlorophyll a. A chip, and one or a plurality of blue LED chips for chlorophyll b having a light emission peak in a wavelength range of 400 to 480 nm so as to correspond to a blue region absorption peak of chlorophyll b, Each blue light emitted from the blue LED chip for chlorophyll b may be emitted from the resin layer.

  That is, the plant has chlorophyll a and chlorophyll b. Here, chlorophyll a and chlorophyll b have different light absorption characteristics in the blue region. Specifically, chlorophyll a has an absorption peak at 400 to 450 nm in the blue region, and chlorophyll b has an absorption peak at 400 to 480 nm in the blue region.

  Therefore, in the present invention, light is emitted in the wavelength range of 400 to 450 nm to correspond to the blue region absorption peak of chlorophyll a so as to correspond to the two types of light absorption characteristics in the blue region of chlorophyll a and chlorophyll b, respectively. One or more blue LED chips for chlorophyll a having a peak and one or more blue for chlorophyll b having an emission peak in the wavelength range of 400 to 480 nm to correspond to the blue region absorption peak of chlorophyll b LED chip.

  As a result, it is possible to provide a plant cultivation LED light source more suitable for plants having chlorophyll a and chlorophyll b.

  In the LED light source for plant cultivation of the present invention, a cathode lead, a cup connected to the cathode lead, one or a plurality of the blue LED chips mounted in the cup, and mounted in the cup An anode lead connected from a blue LED chip via a conductor; a resin layer in which the red phosphor is dispersed and filled in the cup so as to cover the blue LED chip; the cathode lead and the anode lead; A first resin corresponding to a first peak wavelength corresponding to a first peak wavelength having a light emission peak in a range of 400 to 480 nm from the blue LED chip. Suppose that the short wavelength region light and the long wavelength region light corresponding to the peak wavelength having an emission peak in the range of 620 to 700 nm are emitted from the resin layer from the phosphor. Door can be.

  Thereby, it can be set as a so-called cannonball type LED light source for plant cultivation. And since such a bullet-type LED light source for plant cultivation has a small installation area, it is suitable for spot cultivation in plant cultivation.

  In the LED light source for plant cultivation of the present invention, the light source is excited by the first light having a wavelength of 400 nm to 480 nm emitted from the one or more blue LED chips and the first light from the one or more blue LED chips. The second light having a wavelength of 620 nm to 700 nm emitted from the red phosphor is emitted from the resin layer.

  That is, by dispersing a red phosphor in a resin covering one or more blue LED chips, a part of the first light emitted from the one or more blue LED chips is a red phosphor. The second light is emitted from the red phosphor and is scattered by the red phosphor. Since each red phosphor is a point light source, blue light or red light is emitted uniformly.

  As a result, both the blue and red peaks necessary for plant growth can be generated with a single LED light source for plant cultivation. Thus, by setting it as one LED light source for plant cultivation, it becomes possible to reduce the installation area of the LED light source for plant cultivation, increase reliability, and make it a light source suitable for use in a plant factory or the like. it can.

  In order to solve the above problems, the LED light source for plant cultivation of the present invention has a relatively short wavelength among a plurality of peak wavelengths in light absorbed by plants or algae that require light for growth to perform photosynthesis. A plurality of blue first LED chips emitting a first short wavelength region light corresponding to a first peak wavelength having an emission peak in a range of 400 to 480 nm, and a short wavelength region different from the first peak wavelength of 400 to 450 nm A plurality of blue second LED chips emitting second short-wavelength light corresponding to a second peak wavelength having an emission peak in the range of the phosphor, and a phosphor-containing envelope covering the plurality of blue first LED chips and the plurality of blue second LED chips And a phosphor contained in the phosphor-containing sealing resin includes a first short wavelength region light emitted from the plurality of blue first LED chips and the phosphor. Each of the plurality of blue second LED chips emits the second short wavelength region light, thereby, among the plurality of peak wavelengths, a range of 620 to 700 nm that is longer than the first peak wavelength and the second peak wavelength. The first short wavelength light emitted from the plurality of blue first LED chips, the second short wavelength light emitted from the plurality of blue second LED chips, and the above. It is characterized in that long wavelength band light emitted from a phosphor is emitted.

  The LED light source for plant cultivation of the present invention has a relatively short wavelength range of 400 to 480 nm among a plurality of peak wavelengths in light absorbed by plants or algae that need light for growth to perform photosynthesis. And including one or a plurality of first LED chips emitting a first short wavelength band light corresponding to a first peak wavelength having an emission peak, and a phosphor-containing sealing resin covering the first LED chip, and The phosphor contained in the phosphor-containing encapsulating resin absorbs the first short wavelength region light emitted from the first LED chip, and thus has a longer wavelength than the first peak wavelength among the plurality of peak wavelengths. A long wavelength band light corresponding to a peak wavelength having an emission peak in a range of 620 to 700 nm, and emitted from the first short wavelength band light emitted from the first LED chip and the phosphor. The first LED chip emits a long wavelength band light, and the first short wavelength band light corresponding to the first peak wavelength has a relatively short wavelength so as to correspond to the blue band absorption peak of chlorophyll a. In order to correspond to one or more blue LED chips for chlorophyll a and a blue region absorption peak of chlorophyll b, the first short wavelength region light corresponding to the first peak wavelength is , And one or a plurality of blue LED chips for chlorophyll b having a relatively short wavelength range of 400 to 480 nm, and the phosphor includes the blue LED chip for chlorophyll a and the blue LED chip for chlorophyll b. By absorbing each first short wavelength region light emitted from the first peak wavelength, among the plurality of peak wavelengths, the wavelength of 620 to 700 nm longer than the first peak wavelength. A first short-wavelength light emitted from the one or a plurality of blue LED chips for chlorophyll a, comprising at least one kind of red phosphor that respectively emits long-wavelength light corresponding to a peak wavelength having a light emission peak In addition, the first short wavelength light emitted from the one or a plurality of blue LED chips for chlorophyll b and the long wavelength light emitted from the red phosphor are respectively emitted. The relatively short wavelength region means a wavelength region shorter than the wavelength of 500 nm.

  That is, in order to grow organisms such as plants and algae that perform photosynthesis, a light having a first peak wavelength in a relatively short wavelength region and a peak wavelength in a longer wavelength region than the first peak wavelength is often required. . Therefore, the present invention includes one or a plurality of first LED chips that emit first short-wavelength light corresponding to the first peak wavelength, and a phosphor-containing sealing resin that covers the first LED chips. And the fluorescent substance contained in fluorescent substance containing sealing resin emits the long wavelength range light corresponding to the peak wavelength of a long wavelength range rather than the 1st peak wavelength.

  As a result, without using two types of LED chips, an independent blue LED chip and an independent red LED chip, such as chlorophyll necessary for the growth of organisms such as plants and algae with one type of blue LED chip. Light corresponding to the blue region absorption peak and the red region absorption peak can be emitted. For this reason, an installation area is not increased. In this configuration, since the red phosphor is dispersed in the phosphor-containing sealing resin, it is possible to disperse the red phosphor in the resin at a predetermined blending ratio, depending on the blending ratio. Thus, the amount of light in the blue region and the red region can be changed.

  Accordingly, it is possible to easily adjust the light quantity ratio between the blue color region and the red color region with a simple configuration without increasing the installation area, and at the same time, it is possible to emit a mixed color light of blue light and red light with little spatial color unevenness. An LED light source for plant cultivation can be provided.

  In the present invention, the first LED chip has a first short wavelength region light corresponding to the first peak wavelength of 400 to 450 nm in a relatively short wavelength region so as to correspond to the blue region absorption peak of chlorophyll a. One or a plurality of blue LED chips for chlorophyll a in the range and the first short wavelength light corresponding to the first peak wavelength are relatively short wavelength in order to correspond to the blue region absorption peak of chlorophyll b. One or a plurality of blue LED chips for chlorophyll b in the range of 400 to 480 nm, and the phosphor emits each first light emitted from the blue LED chip for chlorophyll a and the blue LED chip for chlorophyll b. By absorbing light in the short wavelength region, it has a light emission peak in the range of 620 to 700 nm that is longer than the first peak wavelength among the plurality of peak wavelengths. A first short-wavelength light emitted from one or a plurality of blue LED chips for chlorophyll a, and at least one of the red-colored phosphors each emitting long-wavelength light corresponding to a peak wavelength. Alternatively, the first short wavelength light emitted from a plurality of blue LED chips for chlorophyll b and the long wavelength light emitted from the red phosphor are respectively emitted.

  That is, the plant has chlorophyll a and chlorophyll b. Here, chlorophyll a and chlorophyll b have different light absorption characteristics in the blue region. Specifically, chlorophyll a has an absorption peak at 400 to 450 nm in the blue region, and chlorophyll b has an absorption peak at 400 to 480 nm in the blue region.

  Therefore, in the present invention, light is emitted in the wavelength range of 400 to 450 nm to correspond to the blue region absorption peak of chlorophyll a so as to correspond to the two types of light absorption characteristics in the blue region of chlorophyll a and chlorophyll b, respectively. One or more blue LED chips for chlorophyll a having a peak and one or more blue for chlorophyll b having an emission peak in the wavelength range of 400 to 480 nm to correspond to the blue region absorption peak of chlorophyll b LED chip.

  As a result, it is possible to provide a plant cultivation LED light source more suitable for plants having chlorophyll a and chlorophyll b.

  In the LED light source for plant cultivation of the present invention, the ratio of the photosynthetic photon flux in the blue region with a wavelength of 400 nm to 480 nm and the photosynthetic photon flux in the red region with a wavelength of 620 nm to 700 nm is 1: 1.3 to 1:10. It is preferable. In addition, a photosynthetic photon flux means a photosynthesis effective photon flux density (PPFD: photosynthetic photon flux density) multiplied by a light irradiation area. Here, the photon flux density refers to a value obtained by dividing the number of photons irradiated in one second by the light receiving area of the material when a certain material is irradiated with solar light.

  Generally, in the case of the photon flux density, the number of photons is counted, so one is one regardless of whether infrared light or ultraviolet light comes. However, the photochemical reaction is triggered only when photons arrive that can be absorbed by the dye. For example, in the case of plants, no matter how much light is not absorbed by chlorophyll, it is the same as it does not exist. Therefore, in the field of photosynthesis, photosynthesis effective photon flux density or photosynthesis photon flux only in the wavelength region from 400 nm to 700 nm that can be absorbed by chlorophyll is defined.

  Here, in the present invention, the ratio of the photosynthetic photon flux in the blue region with a wavelength of 400 nm to 480 nm and the photosynthetic photon flux in the red region with a wavelength of 620 nm to 700 nm is 1: 1.3 to 1:10. As a result, it is possible to provide a plant cultivation LED light source suitable for plant germination, seedling and cultivation.

  In the LED light source for plant cultivation of this invention, it is preferable that the compounding ratio of the resin and the red phosphor in the phosphor-containing sealing resin is 1: 0.05 to 1: 0.20. As a result, it is possible to provide a plant cultivation LED light source suitable for plant germination, seedling and cultivation.

  In the LED light source for plant cultivation of the present invention, when it is intended to be installed on a germination shelf or a seedling shelf, the mixing ratio of the resin and the red phosphor in the resin layer is 1: 0.05 to 1: It is preferably 0.10.

  That is, chlorophyll (chlorophyll), which plays a central role in plant photosynthesis, does not absorb light uniformly, but shows clear absorption peaks near red 660 nm and blue 450 nm, and photosynthesis is related to this. The wavelength characteristic has a first peak near 660 nm and a second peak near 450 nm. In other words, at the cultivation stage where leaves are provided and photosynthesis is active, having both blue and red light components is effective for growth. On the other hand, blue light in the vicinity of 450 nm also affects a photoreaction system called a high energy reaction system of plants, and is essential for the healthy morphogenesis of plants. Therefore, the importance of the blue light component increases at the germination and seedling stage.

  In this regard, in the present invention, the compounding ratio of the resin and the red phosphor in the phosphor-containing sealing resin is 1: 0.05 to 1: 0.10. For this reason, by using this blending ratio, it is possible to provide an LED light source for plant cultivation that easily emits the light of the blue light component that is indispensable for the healthy morphogenesis of plants at the stage of germination and raising seedlings. .

  In the LED light source for plant cultivation of the present invention, when it is intended to be installed on a cultivation shelf, the blending ratio of the resin and the red phosphor in the phosphor-containing sealing resin is 1: 0.15 to 1. : 0.20 is preferable.

  Thereby, the LED light source for plant cultivation which emits the light which has a light component of both blue and red easily in the cultivation stage which has a leaf and photosynthesis becomes active can be provided.

  In the LED light source for plant cultivation of the present invention, when it is intended to be installed on a germination shelf or a seedling shelf, photosynthetic photon flux in a blue region having a wavelength of 400 nm to 480 nm and photosynthesis in a red region having a wavelength of 620 nm to 700 nm. The ratio to the photon flux is preferably 1: 1.3 to 1: 3.5.

  Thereby, it becomes possible to set it as the LED light source for plant cultivation suitable for plant germination and seedling raising.

  In the plant cultivation LED light source of the present invention, when it is intended to be installed on a cultivation shelf, a photosynthetic photon flux in a blue region having a wavelength of 400 nm to 480 nm and a photosynthetic photon flux in a red region having a wavelength of 620 nm to 700 nm The ratio is preferably 1: 7.5 to 1:10.

  Thereby, it becomes possible to set it as the LED light source for plant cultivation suitable for plant cultivation.

In the LED light source for plant cultivation according to the present invention, the red phosphor preferably has a CaAlSiN ₃ : Eu component for plant cultivation containing more chlorophyll a than chlorophyll b.

That is, a red phosphor having a CaAlSiN ₃ : Eu-based component can emit a wavelength having an emission peak of 650 to 660 nm.

Therefore, it is preferable to use a red phosphor having a CaAlSiN ₃ : Eu-based component for plant cultivation containing more chlorophyll a than chlorophyll b.

In the LED light source for plant cultivation of the present invention, the red phosphor has (Sr, Ca) AlSiN ₃ : Eu components for plant cultivation containing more chlorophyll b than chlorophyll a. Is preferred.

That is, chlorophyll b has an absorption peak at 620 to 630 nm in the red region, and a red phosphor having a (Sr, Ca) AlSiN ₃ : Eu-based component emits a wavelength with an emission peak of 620 to 630 nm. be able to.

Therefore, it is preferable to use a red phosphor having a (Sr, Ca) AlSiN ₃ : Eu-based component for plant cultivation containing more chlorophyll b than chlorophyll a.

  In the LED light source for plant cultivation of the present invention, a plurality of blue LED chips are mounted on a substrate, a standing wall is provided around the chip, and the red phosphor is dispersed inside the standing wall. It can be assumed that the resin is filled.

  Thereby, it can be set as the structure of what is called a board | substrate type LED light source for plant cultivation. In this configuration, since a plurality of blue LED chips are used for one plant cultivation LED light source, a large amount of light can be emitted by one plant cultivation LED light source. Further, since the red phosphor dispersed in the resin is used instead of the red LED chip, the installation area corresponding to the plurality of red LED chips corresponding to the plurality of blue LED chips can be greatly reduced.

  Therefore, it is possible to emit a large amount of light with a small installation area by one plant cultivation LED light source.

  In the LED light source for plant cultivation of the present invention, it is preferable that a cooling means is provided on the back surface of the substrate.

  Thereby, it becomes possible to cool the blue LED chip which became high temperature.

  In order to solve the above-mentioned problems, the plant factory of the present invention is characterized by including the above-described LED light source for plant cultivation.

  According to said invention, the plant factory provided with the LED light source for plant cultivation which can adjust easily the light quantity ratio of a blue region and a red region with a simple structure, without increasing an installation area can be provided. .

  In order to solve the above-described problems, the light-emitting device of the present invention has a relatively short wavelength region 400 of a plurality of peak wavelengths in light absorbed by plants or algae that require light for growth to perform photosynthesis. One or a plurality of first LED chips emitting a first short wavelength band light corresponding to a first peak wavelength having an emission peak in a range of ˜480 nm, and a phosphor-containing sealing resin covering the first LED chip. In addition, the first phosphor contained in the phosphor-containing sealing resin absorbs the first short wavelength region light emitted from the first LED chip, and thus the first of the plurality of peak wavelengths. The first short-wavelength region light emitted from the first LED chip, which emits long-wavelength region light corresponding to the peak wavelength having an emission peak in the range of 620 to 700 nm, which is longer than the one-peak wavelength, and the above-mentioned The long wavelength band light emitted from one phosphor is emitted, and the first LED chip has a first short wavelength band light corresponding to the first peak wavelength so as to correspond to a blue band absorption peak of chlorophyll a. Is composed of one or a plurality of blue LED chips for chlorophyll a having a relatively short wavelength range of 400 to 450 nm, further having a peak wavelength in a relatively short wavelength range, and chlorophyll a At least one second LED chip that emits light in a second short wavelength region corresponding to a second peak wavelength different from the first peak wavelength of 400 to 450 nm is provided, and the first phosphor includes the chlorophyll By absorbing the first short wavelength region light emitted from the blue LED chip for a, among the plurality of peak wavelengths, 620 to 700 in a longer wavelength region than the first peak wavelength. a first red phosphor that emits light having a long wavelength region corresponding to a peak wavelength having an emission peak in the range of m, and further absorbing the second short wavelength region light emitted by the second LED chip, thereby A second red phosphor that emits light in a long wavelength region corresponding to an absorption wavelength of phycocyanin in a longer wavelength region than the second peak wavelength among a plurality of peak wavelengths is contained in the phosphor-containing sealing resin. The first short wavelength band light emitted from the one or a plurality of blue LED chips for chlorophyll a, the first short wavelength band light emitted from the at least one second LED chip, and emitted from the first red phosphor. The long wavelength band light and the long wavelength band light emitted from the second red phosphor are respectively emitted.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and the technical means disclosed in different embodiments can be appropriately combined. Such embodiments are also included in the technical scope of the present invention.

  INDUSTRIAL APPLICABILITY The present invention can be applied to a light emitting device that emits light absorbed by plants or algae that require light for growth in order to perform photosynthesis, an LED light source for plant cultivation, and a plant factory.

1 Ceramic substrate (substrate)
2 Blue LED chip (blue LED chip for chlorophyll b, first LED chip)
3 Standing wall 7 Resin layer (phosphor-containing sealing resin)
7a Resin 7b Red phosphor (phosphor)
7c Green phosphor 10 Substrate type LED light source (LED light source for plant cultivation)
10A Substrate type LED light source (LED light source for plant cultivation)
10B Substrate type LED light source (LED light source for plant cultivation)
10C Substrate type LED light source (LED light source for plant cultivation)
10D board type LED light source (LED light source for plant cultivation)
20 LED light source for illumination 30 Plant factory 40 Cannonball type LED lamp (LED light source for plant cultivation)
40A Cannonball type LED lamp (LED light source for plant cultivation)
40D Cannonball type LED lamp (LED light source for plant cultivation)
41 Mount Lead Cup (Cup)
42 Anode lead frame (anode lead)
43 Cathode lead frame (cathode lead)
44 Sealing resin 50 Substrate type LED light source (LED light source for plant cultivation)
52 Blue LED chip (Blue LED chip for Chlorophyll a)

Claims (1)

At least one blue LED chip having an emission peak in the wavelength range of 400 to 480 nm to correspond to the blue region absorption peak of chlorophyll,
Excitation light from the blue LED chip , a plurality of red phosphors each having an emission peak in a wavelength range of 620 to 700 nm to correspond to a red region absorption peak of chlorophyll,
A resin layer that covers the blue LED chip and in which the red phosphor is dispersed is provided,
The plurality of red phosphors has an emission peak with a wavelength of 650 to 660 nm depending on whether chlorophyll a and chlorophyll b contained in the plant to be cultivated are contained in a large amount or half . emitting light CaAlSiN _3: Eu and emission peaks for emitting light having a wavelength of _{620~630nm (Sr, Ca) AlSiN 3} : see contains at least one of Eu,
In plant cultivation containing more chlorophyll a than chlorophyll b, the plurality of red phosphors contains the CaAlSiN ₃ : Eu,
In plant cultivation containing more chlorophyll b than chlorophyll a, the plurality of red phosphors include the (Sr, Ca) AlSiN ₃ : Eu,
In plant cultivation in which half each of chlorophyll a and chlorophyll b is contained, the plurality of red phosphors contain the CaAlSiN ₃ : Eu and the (Sr, Ca) AlSiN ₃ : Eu . LED light source .

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