Double-interlayer type fluorescent solar light collector and preparation method thereof
By using carbon quantum dots as fluorescent materials and a double-sandwich structure for fluorescent solar collectors, the problems of toxicity of traditional materials and low efficiency of single-sandwich structures have been solved, achieving efficient, stable, and low-cost solar energy utilization.
Patent Information
- Application Number
- CN202410909386.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-08
- Publication Date
- 2026-01-13
AI Technical Summary
Existing fluorescent solar collectors have problems in material selection and structural design. The toxicity of traditional fluorescent materials limits their application, and the light absorption and emission capabilities of single-layer structures are limited, resulting in low efficiency.
A fluorescent solar collector using carbon quantum dots as fluorescent materials and employing a double-sandwich structure, comprising a polymer monolayer of yellow and orange fluorescent carbon quantum dots, was prepared through solvothermal synthesis and photopolymerization.
It improves the utilization rate of sunlight and the stability of fluorescent solar collectors, reduces costs, and enhances efficiency and transparency.
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Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the preparation of a double sandwich type fluorescent solar concentrator, and particularly to the application of photovoltaic devices in building photovoltaic integration, such as photovoltaic glass, photovoltaic roof, etc. BACKGROUND
[0002] With the rapid development of industrialization, the large-scale use of fossil energy has become the cornerstone of modern society. However, this dependence not only leads to the depletion of energy resources, but also causes serious pollution and damage to the environment. Therefore, developing new energy to reduce dependence on fossil energy has become a global urgent task. In the face of environmental challenges brought about by fossil energy, it is particularly important to develop new energy. New energy, such as solar energy, wind energy, and water energy, has the characteristics of being clean and renewable, which can effectively reduce environmental pollution and greenhouse gas emissions. Among them, solar energy is widely used as a convenient and economical energy source. However, the large-area use of solar cells is costly and has low utilization. In order to reduce costs and increase utilization area, fluorescent solar concentrators provide a solution to the above problems.
[0003] A fluorescent solar concentrator (LSC) is an economical and efficient photovoltaic converter, which is mainly composed of waveguide materials and fluorescent materials. When sunlight shines on the waveguide material, the fluorescent material will capture these photons and release light with longer wavelengths. Using the principle of total internal reflection, part of the released photons are directed to the periphery of the concentrator and are captured by the edge solar cells, which are then converted into electricity. This method achieves efficient capture and use of sunlight. LSC has important application potential in building photovoltaic integration construction due to its low cost, wide application range and high conversion efficiency.
[0004] Currently, developing efficient solar concentrator devices faces major technical challenges. This mainly involves the selection of materials, including the selection of fluorescent materials and waveguide materials. Traditionally used fluorescent materials, such as organic dyes, semiconductor quantum dots and perovskite quantum dots, are limited in their use in commercial fields and large-scale production due to their potential high toxicity. In addition, the structural design of the fluorescent solar concentrator is also crucial, such as whether to use a single sandwich solar concentrator or a multi-sandwich solar concentrator. Currently, most LSCs use a single sandwich structure, which significantly reduces the overall performance of the LSC due to the limited light absorption and emission ability of the fluorescent material. In contrast, multi-layer LSCs achieve continuous absorption and emission of light through multiple fluorescent layers, effectively improving the capture rate of sunlight and enhancing the performance of the LSC. SUMMARY
[0005] In view of the problems in the prior art, the present application provides a double sandwich type fluorescent solar concentrator and a preparation method thereof, wherein the fluorescent material is selected as carbon quantum dots, and the structure of the double sandwich fluorescent solar concentrator can effectively avoid the above problems. The carbon quantum dots have low toxicity, adjustable excitation wavelength and high stability. The structure of the double sandwich fluorescent solar concentrator can improve the utilization rate of sunlight, the stability of the fluorescent solar concentrator and ultimately improve the efficiency of the fluorescent solar concentrator. Compared with the traditional fluorescent solar concentrator, the fluorescent solar concentrator has the advantages of high transparency, good stability and high light collection efficiency.
[0006] To achieve the above purpose, the specific technical scheme of the present application is a double sandwich type fluorescent solar concentrator and a preparation method thereof, which has the specific feature of a double sandwich structure, i.e. composed of a polymer single sandwich containing yellow fluorescent carbon quantum dots and a polymer single sandwich containing orange fluorescent carbon quantum dots.
[0007] The preparation method comprises the following steps:
[0008] (1) Preparation of fluorescent carbon quantum dots: a certain amount of perylene tetracarboxylic dianhydride and rhodamine 6G is added to an ethanol solution for solvothermal synthesis to obtain yellow fluorescent carbon quantum dots; then a certain amount of perylene tetracarboxylic dianhydride and rhodamine B is added to an ethanol solution for solvothermal synthesis to obtain orange fluorescent carbon quantum dots.
[0009] (2) Preparation of double sandwich type fluorescent solar concentrator: first, add yellow and orange fluorescent carbon quantum dot solution to the polymer monomer, then evaporate the solvent to obtain carbon quantum dot / polymer monomer suspension; then add a certain amount of photoinitiator and crosslinking agent to the above suspension and shake to mix; then drop a certain amount of orange fluorescent carbon quantum dot suspension on a transparent glass sheet, cover it with another transparent glass sheet of the same size, and polymerize under ultraviolet light to prepare a single sandwich fluorescent solar concentrator containing orange fluorescent carbon quantum dots. Then drop a certain amount of the above yellow fluorescent carbon quantum dot suspension on the above single sandwich fluorescent solar concentrator and cover it with another optical glass sheet, and perform photopolymerization under ultraviolet light to obtain a double sandwich fluorescent solar concentrator containing yellow and orange fluorescent carbon quantum dots.
[0010] In the above preparation method, in step (1), the solvothermal reaction temperature is 180-200 ℃; in the above preparation method, in step (1), the solvothermal reaction time is 10-12 h;
[0011] In the above preparation method, in step (2), the polymer monomer can be one of hydroxyethyl methacrylate, polyethylene glycol diacrylate, lauryl methacrylate, ethoxylated trimethylolpropane triacrylate or polyethylene glycol phenyl ether acrylate;
[0012] In the above preparation method, in the step (2), the volume ratio of the solution containing carbon quantum dots to the polymer monomer is 1:1-1:2;
[0013] In the above preparation method, in the step (2), the evaporation temperature is 60 ℃;
[0014] In the above preparation method, in the step (2), the evaporation time is 12-24 h;
[0015] In the above preparation method, in the step (2), the amount of the suspension is 150 μL-2.4 mL.
[0016] Compared with the prior art, the above technical scheme of the present application can achieve the following beneficial effects:
[0017] (1) The present application uses carbon quantum dots as the fluorescent layer to prepare the fluorescent solar concentrator, which is simple to prepare and low in cost. Carbon quantum dots have the advantages of greenness, non-toxicity, high quantum yield, and adjustable emission spectrum, which are conducive to the practical application of the fluorescent solar concentrator.
[0018] (2) Compared with the traditional fluorescent solar concentrator, the present application introduces carbon quantum dots into the fluorescent solar concentrator, and uses the absorption and emission of the carbon quantum dot fluorescent layer to improve the efficiency of the fluorescent solar concentrator. In addition, the fluorescent solar concentrator adopts a double sandwich structure, which can protect the carbon quantum dot fluorescent layer therein and improve the long-term stability of the device.
[0019] In summary, compared with the prior art, the above technical scheme of the present application can achieve the advantages of simple preparation, low cost, high transparency, good stability, and high light collection efficiency.
[0020] Drawings of the specification
[0021] Figure 1 is a schematic diagram of a double sandwich type fluorescent solar concentrator.
[0022] Figure 2 is an HRTEM picture of yellow fluorescent carbon quantum dots and orange fluorescent carbon quantum dots.
[0023] Figure 3 is an optical picture of yellow fluorescent carbon quantum dots and orange carbon quantum dots under ambient light (a-b) and ultraviolet light (c-d).
[0024] Figure 4 is an optical picture of a single sandwich type fluorescent solar concentrator containing yellow fluorescent carbon quantum dots and orange fluorescent carbon quantum dots under ambient light (a-b) and ultraviolet light (c-d).
[0025] Figure 5: Optical pictures of the double-junction fluorescent solar concentrator containing yellow and orange fluorescent carbon quantum dots under ambient light (a) and ultraviolet light (b).
[0026] Figure 6: J-V characteristic curve (a) and performance column chart (b) of the double-junction fluorescent solar concentrator containing yellow and orange fluorescent carbon quantum dots.
[0027] Specific implementation cases
[0028] The application will be described in further detail below with reference to the drawings and specific implementation examples. It can be understood that the specific implementation examples described herein are only used to explain the application, and are not a limitation on the application.
[0029] Example 1
[0030] Preparation of yellow fluorescent carbon quantum dots and orange fluorescent carbon quantum dots, including the following steps:
[0031] (1) Yellow fluorescent carbon quantum dots are prepared by solvothermal method, as shown in Figure 3 (a, c). The steps are as follows: 30 mg of rhodamine 6G and 30 mg of perylene tetracarboxylic dianhydride are dissolved in 10 mL of ethanol, and stirred for a certain time to obtain a uniform mixed solution; the mixed solution is poured into a 50 mL reaction kettle, and reacted at 200 ℃ for 12 h. The yellow fluorescent carbon quantum dots have a spherical structure, and the lattice spacing is 0.21 nm, as shown in Figure 2 (a).
[0032] (2) Orange fluorescent carbon quantum dots are prepared by solvothermal method, as shown in Figure 3 (b, d). The steps are as follows: 30 mg of rhodamine B and 30 mg of perylene tetracarboxylic dianhydride are dissolved in 10 mL of ethanol, and stirred for a certain time to obtain a uniform mixed solution; the mixed solution is poured into a 50 mL reaction kettle, and reacted at 200 ℃ for 12 h. The orange fluorescent carbon quantum dots have a spherical structure, and the lattice spacing is 0.21 nm, as shown in Figure 2 (b).
[0033] Example 2
[0034] Preparation and application of the double-junction fluorescent solar concentrator containing yellow and orange fluorescent carbon quantum dots, including the following steps:
[0035] (1) Carbon quantum dots-hydroxyethyl methacrylate suspension with carbon quantum dots content of 0.012 wt% was prepared by adding 1 mL of yellow carbon quantum dots solution into 3 mL of hydroxyethyl methacrylate monomer, and then evaporating ethanol at 60 °C for 12 h. Subsequently, 0.3 mL of photoinitiator 2-hydroxy-2-methyl-l-phenyl-l-propanone and 0.3 mL of crosslinker ethylene glycol dimethacrylate were added into the above suspension, and shaken to mix well. 150 μL of the suspension was dropped on a transparent glass sheet, and then another glass sheet with the same size was put on it. Subsequently, a single-jacked fluorescent solar concentrator containing yellow fluorescent carbon quantum dots was prepared by photopolymerization under a UV lamp. Optical photographs of the single-jacked fluorescent solar concentrator containing yellow carbon quantum dots under ambient light and UV light are shown in Figure 4 (a, c), respectively.
[0036] (2) Carbon quantum dots-hydroxyethyl methacrylate suspension with carbon quantum dots content of 0.18 wt% was prepared by adding 4 mL of orange carbon quantum dots solution into 1 mL of hydroxyethyl methacrylate monomer, and then evaporating ethanol at 60 °C for 12 h. Subsequently, 0.05 mL of photoinitiator 2-hydroxy-2-methyl-l-phenyl-l-propanone and 0.05 mL of crosslinker ethylene glycol dimethacrylate were added into the above suspension, and shaken to mix well. 150 μL of the suspension was dropped on a transparent glass sheet, and then another glass sheet with the same size was put on it. Subsequently, a double-jacked fluorescent solar concentrator containing yellow and orange fluorescent carbon quantum dots was prepared by photopolymerization under a UV lamp. Optical photographs of the single-jacked fluorescent solar concentrator containing orange carbon quantum dots under ambient light and UV light are shown in Figure 4 (b, d), respectively. The structure of the double-jacked fluorescent solar concentrator is shown in Figure 1 . Optical photographs of the double-jacked fluorescent solar concentrator containing yellow and orange fluorescent carbon quantum dots under ambient light and UV light are shown in Figure 5 (a, b), respectively. The current density of the double-jacked fluorescent solar concentrator was 5.02 mA / cm 2 , and the external quantum efficiency reached 5.18 %, as shown in Figure 6 .
[0037] Example 3
[0038] Preparation of yellow fluorescent carbon quantum dots and orange fluorescent carbon quantum dots, including the following steps:
[0039] (1) 1 mL of yellow carbon quantum dots solution was added to 3 mL of polyethylene glycol diacrylate monomer, and then ethanol was evaporated at 60 °C for 12 h to prepare a carbon quantum dots-polyethylene glycol diacrylate suspension with a carbon quantum dots content of 0.012 wt%. Then 0.3 mL of a photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-propanone and 0.3 mL of a crosslinking agent ethylene glycol dimethacrylate were added to the above suspension, shaken and mixed, 150 μL of the suspension was dropped on a transparent glass sheet, and then another glass sheet of the same size was placed on top, followed by photopolymerization under a UV lamp to prepare a single-jacked fluorescent solar concentrator containing yellow fluorescent carbon quantum dots.
[0040] (2) 4 mL of orange carbon quantum dots solution was added to 1 mL of polyethylene glycol diacrylate monomer, and then ethanol was evaporated at 60 °C for 12 h to prepare a carbon quantum dots-polyethylene glycol diacrylate suspension with a carbon quantum dots content of 0.18 wt%. Then 0.1 mL of a photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-propanone and 0.1 mL of a crosslinking agent ethylene glycol dimethacrylate were added to the above suspension, shaken and mixed, 150 μL of the suspension was dropped on a transparent glass sheet, and then another glass sheet of the same size was placed on top, followed by photopolymerization under a UV lamp to prepare a double-jacked fluorescent solar concentrator containing yellow and orange fluorescent carbon quantum dots.
[0041] Example 4
[0042] Preparation of yellow fluorescent carbon quantum dots and orange fluorescent carbon quantum dots, comprising the following steps:
[0043] (1) 1 mL of yellow carbon quantum dots solution was added to 3 mL of polyethylene glycol diacrylate monomer, and then ethanol was evaporated at 60 °C for 12 h to prepare a carbon quantum dots-polyethylene glycol diacrylate suspension with a carbon quantum dots content of 0.012 wt%. Then 0.3 mL of a photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-propanone and 0.3 mL of a crosslinking agent ethylene glycol dimethacrylate were added to the above suspension, shaken and mixed, 150 μL of the suspension was dropped on a transparent glass sheet, and then another glass sheet of the same size was placed on top, followed by photopolymerization under a UV lamp to prepare a single-jacked fluorescent solar concentrator containing yellow fluorescent carbon quantum dots.
[0044] (2) 4 mL of the orange carbon quantum dots solution was added to 1 mL of lauryl methacrylate monomer, and then ethanol was evaporated at 60 °C for 12 h to prepare a carbon quantum dots-lauryl methacrylate suspension with a carbon quantum dots content of 0.18wt%. Subsequently, 0.1 mL of a photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-propanone and 0.1 mL of a crosslinking agent ethylene glycol dimethacrylate were added to the above suspension, shaken and mixed, 150 μL of the suspension was dropped on a transparent glass sheet, and then another glass sheet of the same size was covered thereon, followed by photopolymerization under a UV lamp to prepare a double sandwich type fluorescent solar concentrator containing yellow and orange fluorescent carbon quantum dots.
[0045] Example 5
[0046] Preparation of yellow fluorescent carbon quantum dots and orange fluorescent carbon quantum dots, comprising the following steps:
[0047] (1) 1 mL of the yellow carbon quantum dots solution was added to 3 mL of ethoxylated trimethylolpropane triacrylate monomer, and then ethanol was evaporated at 60 °C for 12 h to prepare a carbon quantum dots-ethoxylated trimethylolpropane triacrylate suspension with a carbon quantum dots content of 0.012wt%. Subsequently, 0.3 mL of a photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-propanone and 0.3 mL of a crosslinking agent ethylene glycol dimethacrylate were added to the above suspension, shaken and mixed, 150 μL of the suspension was dropped on a transparent glass sheet, and then another glass sheet of the same size was covered thereon, followed by photopolymerization under a UV lamp to prepare a single sandwich type fluorescent solar concentrator containing yellow fluorescent carbon quantum dots.
[0048] (2) 4 mL of the orange carbon quantum dots solution was added to 1 mL of ethoxylated trimethylolpropane triacrylate monomer, and then ethanol was evaporated at 60 °C for 12 h to prepare a carbon quantum dots-ethoxylated trimethylolpropane triacrylate suspension with a carbon quantum dots content of 0.18wt%. Subsequently, 0.1 mL of a photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-propanone and 0.1 mL of a crosslinking agent ethylene glycol dimethacrylate were added to the above suspension, shaken and mixed, 150 μL of the suspension was dropped on a transparent glass sheet, and then another glass sheet of the same size was covered thereon, followed by photopolymerization under a UV lamp to prepare a double sandwich type fluorescent solar concentrator containing yellow and orange fluorescent carbon quantum dots.
Claims
1. The present invention provides a double-jacket type fluorescent solar concentrator, characterized by: The carbon quantum dots are used as light-emitting materials, and the acrylate polymer is used as waveguide material, and the structure features a double sandwich structure, i.e. composed of a polymer single sandwich containing yellow or orange fluorescent carbon quantum dots.
2. The present application provides a method for preparing a double-jacket type fluorescent solar concentrator, comprising the following steps: (1) Preparation of carbon quantum dots: a certain amount of perylene tetracarboxylic dianhydride and rhodamine 6G is added to an ethanol solution for solvent thermal synthesis to obtain yellow fluorescent carbon quantum dots; a certain amount of perylene tetracarboxylic dianhydride and rhodamine B is added to an ethanol solution for solvent thermal synthesis to obtain orange fluorescent carbon quantum dots. The hydrothermal reaction temperature is 180-200 DEG C, and the reaction time is 10-12 h. (2) Preparation of double sandwich type fluorescent solar concentrator: first, the yellow fluorescent carbon quantum dots or orange fluorescent carbon quantum dots solution is added to the polymer monomer, respectively, and then the solvent is evaporated at 60 DEG C to obtain a carbon quantum dots / polymer monomer suspension; then 5-10 wt% of a photoinitiator and a crosslinking agent are added to the suspension and shaken to mix; then a certain amount of the suspension containing orange fluorescent carbon quantum dots is dropped on a transparent glass sheet, and another transparent glass sheet of the same size is used to cover it, and the photopolymerization is carried out under a UV lamp for 5-10 min to prepare a single sandwich fluorescent solar concentrator containing yellow fluorescent carbon quantum dots. Finally, a certain amount of the suspension containing yellow fluorescent carbon quantum dots is dropped on the above-mentioned single sandwich glass sheet, and another transparent glass sheet of the same size is used to cover it, and the photopolymerization is carried out under a UV lamp for 5-10 min to prepare a double sandwich type fluorescent solar concentrator containing yellow and orange fluorescent carbon quantum dots.