KR20110024732A - Photobioreactors having the wave-length conversion layer - Google Patents

Abstract

PURPOSE: A photobioreactor with a wave-length conversion layer is provided to enhance photosynthesis efficiency and to efficiently absorb light in microalgae even placing in the inner part of a reaction container. CONSTITUTION: A photobioreactor(210) for culturing microalgae comprises: a reaction container having an inlet and outlet for inflow and outflow of microalgae and culture medium; and a wave-length conversion unit(220) which has a wave-length conversion layer and a reaction container. The wave-length conversion layer has a quantum dot layer(230). The quantum dot is formed using CdSe, CdS, InAs, or InP.

Description

Photobioreactors having the wave-length conversion layer

The present invention relates to a photobioreactor capable of increasing the photosynthetic efficiency of microalgae and at the same time increasing the culture of microalgae and a method of manufacturing the same.

Recently, due to high oil prices and global food shortages, there is increasing interest in photosynthetic microorganisms, especially algae, as biofuels, and the scope of application is expanding to various ranges such as cosmetics, pharmaceuticals or foods. to be. The reason why microalgae is in the spotlight as biofuels is that microalgae have superior advantages over food crops, which are other sources that can be used as biofuels in many ways, including the required land area and growth rate.

For the microalgae culture, light acts as a key limiting factor, and the growth rate of the cells is determined by the depth and intensity of light transmission.

Photobioreactor is used for the photobiological reaction of microalgae.In order to design an efficient photobioreactor for the cultivation of microalgae at high concentration, it is necessary to transfer light, carbon dioxide, oxygen, maintenance of media components, etc. Restrictions are an important requirement.

Among these, light is a key factor in increasing the efficiency of photobioreactors. Light energy can be classified into two properties, wavelength and intensity, which play an important role in the growth and metabolism of microalgae. The wavelength of light determines the photosynthetic efficiency and depends on the degree of distribution and scattering of light into the culture.

Therefore, whether or not the microalgae is light in the wavelength region that is easy to absorb and whether the photons emitted from the light source can reach the surface of the reactor evenly and deeply penetrate into the culture medium is a very important variable for the growth of the microalgae.

At present, we are trying to increase the conversion efficiency of light for mass production of biofuels, but the problem is that there is a problem in mass production because the absorption range of microalgae is limited and light is not absorbed efficiently. have. Thus, the efficient use of the absorption spectrum of light is becoming a prerequisite to accelerate biofuel commercialization.

Accordingly, in order to solve the above problems, there is a need for an optical bioreactor capable of reducing light of a wavelength in a region where microalgae is difficult to absorb and increasing the amount of light in a wavelength of a region where microalgae is easy to absorb, and a manufacturing method thereof. .

An object of the present invention is to increase the photosynthetic efficiency of the microalgae by converting the wavelength of light so that the microalgae can efficiently absorb light by the wavelength conversion layer including a quantum dot layer.

In addition, according to the present invention, there is another object to facilitate the cultivation of the microalgae by making it possible to efficiently absorb light even inside the microalgae, not the surface side of the reaction vessel of the photobioreactor.

The technical objects to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical subjects which are not mentioned can be clearly understood by those skilled in the art from the description of the present invention .

In order to achieve the above object, the present invention comprises a reaction vessel provided with an inlet and outlet for the introduction and discharge of microalgae and culture medium and a wavelength conversion layer for converting the wavelength of light, the reaction Provided is an optical bioreactor for culturing microalgae including a wavelength conversion unit attached to a container.

In the present invention, the reaction vessel includes a microalgae culturing photobioreactor, characterized in that formed using any one selected from glass, polycarbonate and acrylic-based materials.

In the photobioreactor, the reaction vessel is a part containing microalgae and its culture medium and directly receiving light, and thus, light transmitting property and constant mechanical strength should be ensured. Therefore, in the present invention, it is preferable to use tempered glass which is guaranteed light transmittance and constant mechanical strength. In addition, when the reaction vessel is formed of a transparent plastic material, it is preferable to form a polycarbonate or acrylic material.

The reaction vessel should be provided with at least one inlet and outlet to enable the introduction and discharge of microalgae and its culture. It may also be provided with a movement passage of carbon dioxide for photosynthesis of microalgae.

In the present invention, the shape of the reaction vessel includes a microalgae culture photobioreactor, characterized in that formed by any one selected from the group consisting of a cylindrical, tubular, flat plate and three-dimensional model.

Therefore, the reaction vessel including the wavelength conversion layer may be included in the embodiment of the present invention as long as the three-dimensional model.

In the present invention, the wavelength conversion layer includes all artificial layers capable of converting the wavelength of light. For example, the wavelength conversion layer may be formed using a diffusion film or a surface plasmon layer.

In particular, the diffusion film may be formed of a porous layer in which a plurality of fine holes are formed, or may be formed of a structure in which transparent beads or particles are embedded.

Acrylic resins may be used as the material of the diffusion film, and synthetic resin materials of organic materials having high light transmittance and transparency may be used as the material of the diffusion film.

The beads also need to ensure light transmittance and transparency, and may be formed of organic and inorganic materials that can increase the transmittance and diffusion rate.

As organic materials that can form beads, acrylic, olefin, or acrylic-olefin polymers may be used. As inorganic materials, beads may be formed using SiO _x , AlO _x , TiO _x , ZrO _x , and the like. Can be.

The thickness of the diffusion film may be formed in a size of 100nm to 1 μm, the average diameter of the beads or particles contained in the diffusion film may be formed to a size of 10nm to 900nm. The beads or particles may have various shapes.

In the present invention, the wavelength conversion layer includes an optical bioreactor for culturing microalgae, which is formed of a quantum dot layer.

The quantum dot (quantum dot) when the material has a size of several tens of nanometers shows a new property called the quantum effect (quantum effect) means a physical subunit exhibiting this quantum effect.

In the present invention, the quantum dot layer may be formed by using any one material selected from CdSe, CdS, InAs, or InP, and at this time, molecular beam epitaxy, chemical beam epitaxy, or organic It may be formed using a metal organic chemical vapor deposition method.

For example, a method of growing InAs on a GaAs substrate and an InAs on an InP substrate may be referred to as a method of forming and growing a quantum dot on a substrate according to the position of the generated quantum dots. It is also possible to form a quantum dot layer by using a chemical vapor deposition method, an epitaxy method, and a method of minimizing particle size, distribution state, and aggregation effect.

Also, if necessary, i) ion implantation process is applied to adjust the accelerating voltage and the temperature of the substrate to form the desired metal particles in the substrate and precisely control the distribution thereof. Ii) silicon germanium or metal between the oxides. A method of forming a quantum dot using agglomeration phenomenon, iii) directly forming a few quantum dots using lithography, iv) energy It is also possible to form a quantum dot layer using a method of forming a quantum dot electrically in a band gap or the like.

In the present invention, the average diameter of the dot of the quantum dot layer (Quantum dot layer) comprises a microalgae culture photobioreactor, characterized in that 5 to 50nm.

In the case of a quantum dot, the band gap is changed according to the average diameter of the quantum dot. By adjusting the average diameter of the quantum dot, the band gap can be converted into light of a wavelength band required for microalgae.

For example, by adjusting the average diameter of the quantum dots, if the light in the 800 nm wavelength band is converted into light in the wavelength band that the blue-green-algae can absorb most, that is, the light in the 680 nm wavelength band, the blue-green-algae will absorb the light. The amount of light that can be increased is increased and the efficiency of photosynthesis can be increased by increasing the possibility of active light of not only the microalgae on the surface of the reactor but also the microalgae inside the reactor.

In the present invention, the quantum dot layer includes a photobioreactor for microalgae culture, which is formed using any one or more materials selected from CdSe, CdS, InAs, and InP.

For example, a quantum dot may be formed of a molecular beam epitaxy, a material such as indium phosphorus (InP) or indium arsenide (InAs), which forms a lattice mismatch with a substrate material on a gallium arsenide (GaAs) substrate or an indium phosphorus (InP) substrate. It grows spontaneously when grown above a critical thickness using chemical beam epitaxy, metal organic chemical vapor deposition, or the like.

That is, the above method may be referred to as a quantum dot forming method in which external energy is locally applied to a quasi-stable quantum well layer below a critical thickness to form a quantum dot.

In the present invention, the quantum dot includes a photobioreactor for culturing microalgae, which is made of a phosphor having a core / shell structure capable of wavelength conversion.

In the present invention, the core / shell structure of the phosphor has an average diameter of 5 to 10 nm, and includes a microalgae culture photobioreactor.

Quantum dots coated with a ZnS shell on a CdSe core are spherical materials with an average diameter ranging from several nanometers to several tens of nanometers, and emit fluorescence at different wavelengths depending on the size of the particles. In addition, it can be used in a variety of applied life sciences such as various protein chips and biosensors. Quantum dots can be excited at any wavelength from UV to red and have an adjustable narrow emission spectrum.

Such quantum dot phosphors utilize characteristics of the quantum dot structure of nanoparticles, and are formed by preparing particles having a quantum effect of several nanometers using a semiconductor compound. The quantum dot phosphor is composed of a valence band (VB) filled with electrons and a conduction band (CB) with empty electrons. When light above the energy corresponding to the gap between the covalent band and the conducting band is irradiated, it is excited, and the electrons of the conducting band are combined with the holes of the covalent band to generate fluorescence. Unlike conventional chemical phosphors, the quantum dot phosphor has a feature that the excitation spectrum and the emission spectrum have different positions by wavelength.

For example, in the case of CdS, if the absorption wavelength is 496 nm or less, fluorescence can be generated, and the emission wavelength is about 550 to 600 nm. In addition, CdSe can be excited at a wavelength of 708 nm or less. In addition, the quantum dot phosphor has a characteristic of emitting fluorescence of different colors when the size is changed. That is, phosphors of 1 nm and several nm can emit fluorescence having respective characteristic colors.

In the present invention that the fluorescent substance of the core / shell structure is formed by any one selected from the group consisting of CdSe / ZnS, SrS / Eu, Y₂O 3 / Eu 3 +, SrTiO3 / Pr, SrTi0 3 / Al, SrB 4 O 7 / Sm It includes a photobioreactor for culturing microalgae characterized in that.

A core / shell structured phosphor composed of CdSe / ZnS is a red phosphor that is excited by receiving short wavelength light and emits light having a wavelength of about 680 nm.

In general, the action spectra of various kinds of microalgae are mainly distributed in the incident light of 250 nm to 750 nm. In particular, blue algae has a maximum action spectra at 680 nm, and green algae and brown algae are 435, respectively. Photosynthesis can be performed most efficiently near the nm and 675 nm region. Due to the core / shell structured phosphor composed of CdSe / ZnS, the photosynthetic efficiency can be significantly improved.

May be present in invention, in addition to CdSe / ZnS using a red phosphor, such as _{SrS / Eu, Y₂O 3 / Eu} 3 +, SrTiO3 / Pr, SrTi0 3 / Al, SrB 4 O 7 / Sm to form the quantum dot layer, and eventually Photosynthetic efficiency of microalgae and cultivation of microalgae can be facilitated.

The present invention includes a microalgae culturing photobioreactor, characterized in that the coating after the wavelength conversion portion on the film, attached to the outer surface or the inner surface of the reaction vessel.

The shape of the reaction vessel may be formed by any one shape selected from the group consisting of a cylindrical, tubular, flat plate and three-dimensional model, the wavelength change portion having a wavelength conversion layer on the outer surface or the inner surface of the reaction vessel The coated film can be attached to form a photobioreactor.

The present invention includes a microalgae culturing photobioreactor, characterized in that the wavelength conversion is applied to the surface of the reaction vessel to form a wavelength conversion portion.

In the present invention, the coating thickness of the phosphor capable of converting the wavelength includes a microalgae culturing photobioreactor, characterized in that 0.1 to 100um.

In the present invention, the wavelength conversion layer comprises a microalgae culture photobioreactor, characterized in that for converting the wavelength of the incident light to any one selected from 435nm, 675nm or 680nm.

Among the algae, green algae absorbs light most efficiently at 435 nm, resulting in maximum photosynthetic efficiency, whereas brown algae at 675 nm and blue algae at 680 nm, respectively. Therefore, when the wavelength conversion layer is configured to be converted to 435 nm, 675 nm or 680 nm, the photosynthetic efficiency can be improved according to the type of microalgae.

According to the present invention, the wavelength conversion layer including the quantum dot layer has the effect of converting the wavelength of light and allowing the microalgae to efficiently absorb the light, thereby increasing the photosynthetic efficiency.

According to the present invention, the microalgae inside the photoreactor, rather than the surface side of the reaction vessel, can efficiently absorb light, thereby facilitating the cultivation of the microalgae.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only one of the most preferred embodiments of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

1 is an illustration of a photobioreactor according to the prior art.

1 shows a vertical cylindrical reaction vessel 110 capable of culturing and growing microalgae according to the prior art.

For the growth of microalgae, it is appropriate to provide heat, air, nutrients and light to the environment in the reaction vessel to create an environment similar to nature and maximize photosynthesis. photobioreactor). The problem in the prior art is that most of the light is absorbed by the microalgae on the surface side of the reaction vessel so that the microalgae inside the reaction vessel can hardly receive light. In order to solve this problem, development has been made to make a reactor having a large surface-to-volume ratio, but since the absorption wavelength region of the light of the microalgae is limited and the light that is not the wavelength of the absorption region is discarded as heat, The population culture of algae has been difficult to absorb.

In order to solve this problem, it is necessary to reduce the light in the wavelength region where the microalgae are difficult to absorb and to investigate the amount of light in the wavelength region where the microalgae is easy to absorb.

2 is a cross-sectional view of a photobioreactor according to an embodiment of the present invention.

In the present invention, it is possible to form an optical bioreactor including a reaction vessel 210 to which the wavelength conversion unit 220 including the quantum dot layer 230 is attached.

The reaction vessel 210 should be formed using a material that ensures light transmittance and a predetermined mechanical strength. The reaction vessel 210 may be formed using a glass, polycarbonate, or acrylic material.

The wavelength conversion unit 220 may include an artificial layer, ie, a wavelength conversion layer, which helps cultivate photosynthetic microorganisms related to light absorption.

In particular, the present invention may include a quantum dot layer 230. In the present invention, a molecular beam epitaxy method or a chemical beam epitaxy method is applied to any one material selected from among CdSe, CdS, InAs, or InP. Alternatively, the quantum dot layer 230 may be formed using any one method selected from metal organic chemical vapor deposition.

The quantum dot layer 230 may be formed so that the average diameter of the dot is 5 to 50nm, in the case of a quantum dot, the band gap is changed according to the average diameter of the quantum dot, thereby controlling the average diameter of the quantum dot. As a result, it can be converted into light of a wavelength band required for microalgae.

Therefore, when light is incident on the quantum dot layer 230 included in the wavelength conversion unit 220 as described above, the wavelength is converted by the dot of the quantum dot to significantly improve the photosynthetic efficiency of the microalgae, and the reaction vessel ( The probability of entering light up to the inside of 210 is increased, so that not only the microalgae on the surface side but also the photosynthetic efficiency of the microalgae on the inside of the reaction vessel 210 are also improved.

The quantum dot layer 230 is a core / shell (core / shell), there may be formed of a structure, in the present invention, CdSe / ZnS, SrS / Eu, Y₂O ₃ / Eu ^{3 +,} SrTiO3 / Pr, SrTi0 ₃ / Al, SrB It may be formed of a core / shell structure, such as ₄ O ₇ / Sm.

The wavelength conversion layer may be formed using a diffusion film or a surface plasmon layer, if necessary.

3 is an exemplary view of a core / shell structure according to an embodiment of the present invention.

The quantum dot layer may be formed in a core / shell structure, and a circular core 310 may be located therein, and the core 310 may be formed in a shape in which the shell 320 is surrounded. . In the present invention, the average diameter of the phosphor of the core / shell structure may be formed to 5 to 10nm.

According to the present invention may be formed of a CdSe / ZnS, SrS / Eu, Y₂O 3 / Eu 3 +, SrTiO3 / Pr, SrTi0 3 / Al, SrB 4 O core / shell structure, such as ₇ / Sm. The phosphor constituting the core / shell structure is a red phosphor that converts light of short wavelength into light of long wavelength.

For example, a core / shell structured phosphor formed of CdSe / ZnS is a red phosphor that is excited by light having a short wavelength and emits light having a wavelength of about 680 nm. Therefore, the blue algae has a maximum action spectra at 680 nm and the green algae at 435 nm and 675 nm for the brown algae, respectively, and due to the core / shell structured phosphor composed of CdSe / ZnS, Algae, green algae, and brown algae convert light into wavelength bands that are easily absorbed, resulting in high photosynthetic efficiency.

Figure 4 is an illustration of a cylindrical photobioreactor having a wavelength conversion portion attached to the surface according to an embodiment of the present invention, Figure 5 is a cylindrical photobioreactor having a wavelength change portion attached to the surface according to an embodiment of the present invention Side view.

The reaction vessels 410 and 510 may be made of glass, polycarbonate, or acrylic materials. When the wavelength conversion layer on which the quantum dot layer is formed is coated on a film, the reaction vessels 410 and 510 may be attached to the outside or inside of the reaction vessel. It is possible to form a cylindrical photoreactor as shown in FIG.

Therefore, in the cylindrical photobioreactor as described above, the film coated with the wavelength conversion layer may serve as the wavelength conversion parts 420 and 520. In addition, in the case of the diffusion film, it is possible to form the wavelength conversion portion 420, 520 by attaching to the outer surface or the inner surface of the reaction vessel (410,510).

6 is an exemplary view of a tubular photobioreactor according to an embodiment of the present invention.

In the tubular photobioreactor, several cylindrical reaction vessels 610 may be formed by being coupled to the support 620. The reaction vessel 610 should include a wavelength conversion layer, and the support 620 should be provided with an inlet passage and an outlet passage capable of supplying microalgae and culture medium.

Figure 7 is an illustration of a flat plate-type photobioreactor according to an embodiment of the present invention.

Referring to FIG. 7, a photobioreactor may be formed using a rectangular parallelepiped plate reaction container 710. In this case, the transparent plate 720 must be light-transmitted and of course, may serve as a support. Can be.

If necessary, the transparent plate 720 may be provided with an inlet passage and an outlet passage of the microalgae and the culture solution.

8 is a flowchart of a method of manufacturing a photobioreactor according to an embodiment of the present invention.

First, the reaction vessel must be formed (S810), the reaction vessel can be formed using a glass or transparent plastic material which is guaranteed light transmittance. It should also include at least one inlet and outlet to enable the inflow and outflow of microalgae and culture. If necessary, a separate movement passage for the movement of carbon dioxide may be formed.

Subsequently, the wavelength conversion layer needs to be formed (S820), and the wavelength conversion layer includes all artificial layers capable of converting wavelengths of light.

In particular, the present invention may include a quantum dot layer, the molecular beam epitaxy method, chemical beam epitaxy method or organometallic chemistry to any one material selected from CdSe, CdS, InAs or InP The quantum dot layer may be formed using any one method selected from metal organic chemical vapor deposition.

For example, a material such as indium phosphorus (InP) or indium arsenide (InAs) that forms a lattice mismatch with a substrate material on a gallium arsenide (GaAs) substrate or an indium phosphorus (InP) substrate may be molecular beam epitaxy or actinic epitaxial. It grows spontaneously when grown above a critical thickness using a taxi (chemical beam epitaxy), metal organic chemical vapor deposition (metal organic chemical vapor deposition).

In addition, the quantum dot layer in the present invention, there can be formed by using the phosphor of the core / shell structure .CdSe / ZnS, SrS / Eu, Y₂O 3 / Eu 3 +, SrTiO3 / Pr, SrTi0 3 / Al, SrB 4 O _It is also possible to form the wavelength conversion layer using a phosphor having a core / shell structure such as ₇ / Sm.

After passing through the wavelength conversion layer forming step (s820), the reaction vessel and the wavelength conversion unit is combined step (s830).

The coupling step of the reaction vessel and the wavelength conversion unit (s830) may be a step of coupling the wavelength conversion unit coated on the film (film) on the outer surface or the inner surface of the reaction vessel.

 That is, the quantum dot layer formed using CdSe, CdS, InAs, or InP may be coated on a transparent film to bond the surface of the reaction vessel with a transparent adhesive to form a photobioreactor.

In addition, the coupling step of the reaction vessel and the wavelength conversion unit (s830) may be a step of coupling the wavelength conversion unit by applying a phosphor capable of wavelength conversion on the surface of the reaction vessel.

That is, CdSe / ZnS, SrS / Eu , Y₂O 3 / Eu 3 +, SrTiO3 / Pr, SrTi0 3 / Al, SrB 4 to O ₇ / Sm is applied a thin layer of phosphor, such as the surface of the reaction vessel to form a photobioreactor Can be. Here, the coating thickness of the phosphor capable of wavelength conversion may be formed to 0.1 to 100um.

In the present invention, if necessary, in addition to the quantum dot layer, it is also possible to form a wavelength conversion layer using a diffusion film or a surface plasmon layer.

The present invention has been described above in connection with specific embodiments of the present invention, but this is only an example and the present invention is not limited thereto. Those skilled in the art can change or modify the described embodiments without departing from the scope of the present invention, and within the equivalent scope of the technical spirit of the present invention and the claims to be described below. Various modifications and variations are possible.

1 is an illustration of a photobioreactor according to the prior art.

2 is a cross-sectional view of a photobioreactor according to an embodiment of the present invention.

3 is an exemplary view of a core / shell structure according to an embodiment of the present invention.

Figure 4 is an illustration of a cylindrical photobioreactor having a wavelength conversion portion attached to the surface according to an embodiment of the present invention.

Figure 5 is a side view of a cylindrical photobioreactor having a wavelength change portion attached to the outer surface according to an embodiment of the present invention.

Figure 6 is an illustration of a tubular photobioreactor according to one embodiment of the present invention.

Figure 7 is an illustration of a flat plate-type photobioreactor according to an embodiment of the present invention.

8 is a flow chart of a manufacturing method of a photobioreactor according to an embodiment of the present invention.

{Description of major symbols in the drawing}

110, 210, 410, 510: reaction vessel

220, 420, 520: wavelength conversion unit

230: quantum dot layer

310: core

320: shell

610, 710: reaction vessel with a wavelength conversion unit

620: support

720: transparent plate

Claims (13)

A reaction vessel having an inlet and an outlet through which microalgae and culture fluid are introduced and discharged; And A wavelength conversion unit having a wavelength conversion layer converting wavelengths of light and attached to the reaction vessel; Microbioal culture photobioreactor comprising a (photobioreactor). The method of claim 1, The reaction vessel is a microalgae culturing photobioreactor, characterized in that formed using any one selected from glass, polycarbonate and acrylic-based materials. The method of claim 1, The shape of the reaction vessel is a microalgae culture photobioreactor, characterized in that formed by any one selected from the group consisting of a cylindrical, tubular, flat plate and three-dimensional model. The method of claim 1, The wavelength conversion layer is a microalgae culture photobioreactor, characterized in that formed of a quantum dot layer (Quantum dot layer). The method of claim 4, wherein The average diameter of the dot of the quantum dot layer (Quantum dot layer) is a microalgae culture photobioreactor, characterized in that 5 to 50nm. The method of claim 4, wherein The quantum dot layer (Quantum dot layer) is a microalgae culture photobioreactor, characterized in that formed using any one or more materials selected from among CdSe, CdS, InAs, InP. The method of claim 4, wherein The quantum dot (Quantum dot) is a microalgae culture photobioreactor, characterized in that consisting of a phosphor of the core / shell structure capable of wavelength conversion. The method of claim 7, wherein The core / shell structure of the microalgae culture optical bioreactor, characterized in that the average diameter of the phosphor of 5 to 10nm. The method of claim 7, wherein It is formed by any one selected from the core / phosphor of the shell structure CdSe / ZnS, SrS / Eu, Y₂O 3 / Eu 3 +, SrTi0 3 / Pr, SrTi0 3 / Al, SrB 4 O 7 / Sm Photomicroreactor for culturing microalgae. The method of claim 1, After coating the wavelength conversion unit on the film, the microalgae culturing photobioreactor, characterized in that formed by attaching to the outer surface or the inner surface of the reaction vessel. The method of claim 1, A photobioreactor for culturing microalgae, characterized in that the wavelength conversion is applied to the surface of the reaction vessel to form a wavelength conversion portion. The method of claim 11, The coating thickness of the phosphor capable of converting the wavelength is microalgae culture photobioreactor, characterized in that 0.1 to 100um. The method of claim 1, The wavelength conversion layer is a microalgae culture optical bioreactor, characterized in that for converting the wavelength of the incident light to any one selected from 435nm, 675nm or 680nm.

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