Environmentally friendly, high-efficiency lead-free perovskite quantum dot fluorescent solar concentrator and its preparation method

Abstract

The environmentally friendly, high-efficiency, lead-free perovskite quantum dot fluorescent solar collector disclosed in this invention comprises a transparent optical waveguide matrix and a fluorescent emitter dispersed in the transparent optical waveguide matrix. The transparent optical waveguide matrix is ​​polydimethylsiloxane, and the fluorescent emitter is Bi. 3+ Doped lead-free perovskite quantum dots Cs2Na 0.6 Ag 0.4 The molar composition formula for the InCl6 phosphor is Cs2Na. 0.6 Ag 0.4 In 1‑ x Bi x Cl6, where x is Bi 3+ The mole fraction of doping, x, ranges from 0.01 to 0.2. This fluorescent solar concentrator features ultra-wideband emission (450–750 nm) and ultra-large Stokes shift (approximately 244 nm), with an internal quantum efficiency of up to 41.7%, visible light transmittance greater than 80%, and excellent flexibility, allowing for easy shape adjustment for better compatibility with buildings, thus achieving building-integrated photovoltaics (BIPV) and meeting the dual requirements of BIPV for building material transparency and photoelectric performance.

Description

Technical Field

[0001] This invention belongs to the field of concentrated photovoltaic power generation technology, specifically relating to an environmentally friendly, high-efficiency lead-free perovskite quantum dot fluorescent solar concentrator and its preparation method. Background Technology

[0002] Building-integrated photovoltaics (BIPV) combines photovoltaic technology with architectural design and building materials, integrating solar panels into the building structure to achieve building-based energy production. This integration not only provides clean energy but also improves building energy efficiency and environmental impact. However, in BIPV systems, traditional solar cells often fail to meet the dual requirements of transparency and photoelectric performance in building materials. Therefore, there is an urgent need for novel photovoltaic devices that can maintain high transparency while improving photoelectric performance. Quantum dot-based luminescent solar concentrators (QD-LSCs) are considered ideal devices for BIPV because they maintain transparency to building materials while improving the efficiency of solar cells. QD-LSCs consist of quantum dot materials that absorb and convert sunlight and a transparent matrix that transmits photons. The basic principle is that when sunlight enters the QD-LSC from its upper surface, the quantum dots in the transparent matrix absorb the sunlight photons, subsequently generating photoluminescence. The newly emitted photons will propagate through the transparent matrix by total internal reflection, eventually reaching the edge of the device to form a concentrated beam, and will be absorbed by the solar panels placed at the edge of the device for photoelectric conversion, thus realizing high-concentration solar power generation.

[0003] Currently, numerous quantum dot materials have been applied to the fabrication of QD-LSCs. Among them, all-inorganic lead halide perovskite quantum dots (CsPbX3, LHP QD, X = Cl, Br, I) possess advantages such as a wide light absorption range, high photoluminescence quantum efficiency, and tunable emission wavelength within the visible light range, making them considered ideal materials for fabricating high-efficiency QD-LSCs. However, the lead toxicity of LHP QDs limits their commercial development, and their poor stability to humidity and heat leads to poor compatibility with polymers, ultimately affecting the efficiency of LHP QD-LSCs. Therefore, there is an urgent need for a new, lead-free, and stable perovskite quantum dot material to fabricate environmentally friendly and efficient perovskite quantum dot fluorescent solar concentrators. Summary of the Invention

[0004] The technical problem to be solved by this invention is to provide an environmentally friendly and efficient fluorescent solar concentrator based on lead-free and stable perovskite quantum dot materials and its preparation method. The fluorescent solar concentrator has ultra-wideband emission (450-750nm) and ultra-large Stokes shift (about 244nm), with an internal quantum efficiency of up to 41.7% and a visible light transmittance of more than 80%. It also has good flexibility and its shape can be flexibly adjusted to better integrate with buildings, realize building-integrated photovoltaics (BIPV), and meet the dual requirements of BIPV for the transparency and photoelectric performance of building materials.

[0005] The technical solution adopted by this invention to solve the above-mentioned technical problems is as follows: an environmentally friendly and efficient lead-free perovskite quantum dot fluorescent solar concentrator. This fluorescent solar concentrator comprises a transparent optical waveguide matrix and a fluorescent emitter dispersed in the transparent optical waveguide matrix. The transparent optical waveguide matrix is ​​polydimethylsiloxane (PDMS), and the fluorescent emitter is Bi... 3+ Doped lead-free perovskite quantum dots Cs2Na 0.6 Ag 0.4 InCl6, the molar composition expression of the phosphor is Cs2Na. 0.6 Ag 0.4 In 1-x Bi x Cl6, where x is Bi 3+ The mole fraction of doping, x, ranges from 0.01 to 0.2.

[0006] The fluorescent solar concentrator of this invention uses Bi 3+ Doped lead-free perovskite quantum dots Cs2Na 0.6 Ag 0.4 InCl6 is a fluorescent emitter, and its Na+... + Ag + and In 3+ Replaces Pb in traditional lead-based halide perovskite quantum dots 2+ It completely eliminates lead poisoning, and Bi 3+ The introduction of Bi not only passivates the surface defects of quantum dots, reducing their number, but also... 3+The formation of new radiative recombination centers within the band gap of the quantum dot broadens its emission wavelength range, resulting in excellent photoluminescence characteristics. Its photoluminescence wavelength covers the entire visible light region (450–750 nm), better matching the EQE spectrum of commercial Si solar cells, thereby improving the photoelectric conversion efficiency of the solar cell. Furthermore, the quantum dot possesses an ultra-large Stokes shift of approximately 244 nm, which effectively suppresses reabsorption losses in fluorescent solar collectors, improving their efficiency. The transparent waveguide matrix PDMS used in the fluorescent solar collector of this invention utilizes long siloxane chains that effectively bond with the surface ligands of the lead-free perovskite quantum dot, improving the compatibility between the transparent waveguide matrix and the fluorescent emitter, further passivating and reducing surface defects in the quantum dot, increasing the fluorescence quantum yield of the quantum dot, and ultimately achieving an internal quantum efficiency of up to 41.7% for the fluorescent solar collector.

[0007] The above-mentioned method for preparing an environmentally friendly, high-efficiency, lead-free perovskite quantum dot fluorescent solar concentrator includes the following steps:

[0008] Preparation and purification of S1 and QD stock solutions

[0009] S1.1 Weighing raw materials

[0010] According to the expression Cs2Na 0.6 Ag 0.4 In 1-x Bi x The molar composition of Cl6 was calculated and the raw materials were weighed, wherein Cs, Na, Ag, In, Bi, and Cl were added in the form of CsCH3COO, NaOH, AgCH3COO, In(CH3COO)3, Bi(CH3COO)3, and TMS-Cl (trimethylchlorosilane), respectively.

[0011] S1.2, Synthetic QD stock solution

[0012] 191.95 mg of CsCH3COO, 12 mg of NaOH, 33.38 mg of AgCH3COO, 144.52–116.78 mg of In(CH3COO)3, and 1.93–38.61 mg of Bi(CH3COO)3 were added to a three-necked flask. Then, 10 mL of octadecene, 1 mL of oleic acid, and 0.25 mL of oleylamine were added to obtain a mixed solution. This mixed solution was then evacuated to a vacuum at room temperature for 30 minutes. After 60 minutes, nitrogen gas is introduced into the three-necked flask, and the mixed solution is heated to 100-120°C. The temperature is maintained at 100-120°C and stirred for 30-60 minutes until all raw materials are completely dissolved to obtain quantum dot precursor solution. Then, the quantum dot precursor solution is heated to 175-185°C, and 0.6 mL of TMS-Cl is quickly injected into the three-necked flask. After 5-10 seconds, the three-necked flask is transferred to an ice bath in ice water to room temperature, thus synthesizing the QD stock solution.

[0013] S1.3, Purification of QD stock solution

[0014] Take 2 mL of QD stock solution from a three-necked flask and add it to a centrifuge tube. Then, inject 6 mL of n-hexane into the centrifuge tube and mix it with the QD stock solution to obtain a mixed solution. Centrifuge the mixed solution at 7000-8000 rpm for 10 minutes. After centrifugation, retain the precipitate. Then, inject 6 mL of the mixture of ethyl acetate and n-hexane into the centrifuge tube and mix it with the precipitate. Centrifuge the resulting mixed solution at 7000-8000 rpm for 10 minutes. After centrifugation, retain the precipitate. Then, disperse the obtained precipitate in 5 mL of n-hexane and centrifuge at 3000 rpm for 3-5 minutes. Retain the supernatant, which is the QD purified solution.

[0015] S2. Preparation of fluorescent solar concentrators

[0016] S2.1 Dilute the QD purified solution with n-hexane to obtain a QD dilution solution with a quantum dot concentration of 1.5-6 mg / mL. Mix the QD dilution solution with polydimethylsiloxane gel uniformly to form a mixture. The weight ratio of QD to polydimethylsiloxane gel in the mixture is (0.0003-0.0012):3.3. Place the mixture in a vacuum pump and degas for 30-60 minutes to obtain the prepolymer of the fluorescent solar collector.

[0017] S2.2 Pour the prepolymer of the fluorescent solar collector into a mold, heat it to 100-120℃ and keep it at that temperature for 1-2 hours to cure it. After demolding, you will get an environmentally friendly, high-efficiency, lead-free perovskite quantum dot fluorescent solar collector.

[0018] Preferably, in the mixture of ethyl acetate and n-hexane, the volume ratio of ethyl acetate to n-hexane is 1:3.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] (1) The fluorescent solar collector of the present invention uses Bi 3+ Doped lead-free perovskite quantum dots Cs2Na 0.6 Ag 0.4 InCl6 is a fluorescent emitter, and its Na+... + Ag + and In 3+ Replaces Pb in traditional lead-based halide perovskite quantum dots 2+ It completely eliminates lead poisoning, and Bi 3+ The introduction of Bi not only passivates the surface defects of quantum dots, reducing their number, but also... 3+ The formation of new radiative recombination centers within the band gap of the quantum dot broadens its emission wavelength range, resulting in excellent photoluminescence characteristics. Its photoluminescence wavelength covers the entire visible light region (450–750 nm), better matching the EQE spectrum of commercial Si solar cells, thereby improving the photoelectric conversion efficiency of solar cells. Furthermore, this quantum dot possesses an ultra-large Stokes shift of approximately 244 nm, which can effectively suppress reabsorption losses in fluorescent solar collectors, improving their efficiency.

[0021] (2) This invention uses polydimethylsiloxane (PDMS), a flexible and transparent polymer, as a transparent optical waveguide matrix. The long siloxane chain of the transparent optical waveguide matrix PDMS can effectively bond with the surface ligands of the lead-free perovskite quantum dots, which can improve the compatibility between the transparent optical waveguide matrix and the fluorescent emitter, further passivate and reduce the surface defects of the quantum dots, improve the fluorescence quantum yield of the quantum dots, and thus make the internal quantum efficiency of the fluorescent solar collector as high as 41.7%, which can effectively absorb, convert and transmit photons, improve the light flux per unit area of ​​commercial Si solar cells, and ultimately improve the photoelectric conversion efficiency of solar cells.

[0022] (3) The preparation method of the lead-free perovskite quantum dot fluorescent solar concentrator of the present invention is simple, and the prepared lead-free perovskite quantum dot fluorescent solar concentrator still has a considerable visible light transmittance of more than 80% under high quantum dot concentration. At the same time, the fluorescent solar concentrator has good flexibility and its shape can be flexibly adjusted to better integrate with buildings, realize photovoltaic building integration, and meet the dual requirements of photovoltaic building integration for building material transparency and photoelectric performance. Attached Figure Description

[0023] Figure 1 The luminescence spectra (PL) and quantum efficiency (PLQY) of the QD purification solutions prepared in Examples 1-5 and Comparative Example 1 as a function of Bi 3+ Curve showing the change in doping concentration;

[0024] Figure 2 The absorption spectrum (purple solid line), emission spectrum (orange solid line), AM 1.5 spectrum (gray background) of the QD purified solution of Example 3, and EQE spectrum (red dashed line) of a commercial Si solar cell are shown.

[0025] Figure 3 Physical images of the fluorescent solar concentrator samples prepared in Examples 6-9;

[0026] Figure 4 The edge efficiency (η) of the fluorescent solar concentrator samples prepared in Examples 6-9 edge ), quantum efficiency (η) LSC,PL ), internal quantum efficiency (η) int ) Relationship between quantum dot concentration and concentration;

[0027] Figure 5 Transmission spectra of the fluorescent solar collector samples prepared in Examples 6-9;

[0028] Figure 6 This is a diagram illustrating the flexibility of the fluorescent solar collector sample prepared in Example 7. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0030] I. Examples 1-5 and Comparative Example 1

[0031] Preparation of fluorescent Cs2Na 0.6 Ag 0.4 In 1-x Bi x The QD purification solution of Cl6 differs from that in Examples 1-5 in that Bi 3+ The molar fraction of doping varies in Examples 1-5. 3+ The mole fraction x of the doping is 0.01, 0.05, 0.1, 0.15, and 0.2. Meanwhile, for comparison, undoped Bi... 3+ Cs2Na 0.6 Ag 0.4 The QD purified solution of InCl6 was used as Comparative Example 1.

[0032] The preparation methods of the QD purification solutions in Examples 1-5 include the following steps:

[0033] S1.1 Weighing raw materials

[0034] According to the expression Cs2Na 0.6 Ag 0.4 In 1-x Bi xThe molar composition of Cl6 was calculated and the raw materials were weighed. Cs, Na, Ag, In, Bi, and Cl were added in the form of CsCH3COO, NaOH, AgCH3COO, In(CH3COO)3, Bi(CH3COO)3, and TMS-Cl, respectively. The weighed raw materials are shown in Table 1.

[0035] S1.2, Synthetic QD stock solution

[0036] Weigh out CsCH3COO, NaOH, AgCH3COO, In(CH3COO)3, and Bi(CH3COO)3 and add them to a 100 mL three-necked flask. Then add 10 mL of octadecene (ODE), 1 mL of oleic acid (OA), and 0.25 mL of oleylamine to obtain a mixed solution. Vacuum the mixed solution at room temperature for 30 minutes, then introduce nitrogen gas into the three-necked flask and heat the mixed solution to 100 °C. Maintain the temperature at 100 °C and stir for 60 minutes until all raw materials are completely dissolved to obtain a quantum dot precursor solution. Then heat the quantum dot precursor solution to 185 °C and quickly inject 0.6 mL of TMS-Cl into the three-necked flask. After 10 seconds, transfer the three-necked flask to an ice bath and cool it to room temperature to obtain the QD stock solution.

[0037] S1.3, Purification of QD stock solution

[0038] Take 2 mL of QD stock solution from a three-necked flask and add it to a centrifuge tube. Then, inject 6 mL of n-hexane into the centrifuge tube and mix it with the QD stock solution to obtain a mixed solution. Centrifuge the mixed solution at 8000 rpm for 10 minutes. After centrifugation, retain the precipitate. Then, inject 6 mL of a mixture of ethyl acetate and n-hexane (the volume ratio of ethyl acetate to n-hexane is 1:3) into the centrifuge tube and mix it with the precipitate. Centrifuge the resulting mixed solution at 8000 rpm for 10 minutes. After centrifugation, retain the precipitate. Then, disperse the obtained precipitate in 5 mL of n-hexane and centrifuge at 3000 rpm for 3 minutes. Retain the supernatant, which is the QD purified solution.

[0039] Comparative Example 1 Cs2Na 0.6 Ag 0.4 The preparation process of the QD purification solution of InCl6 is similar to that in Examples 1-5, and the amount of raw materials used is shown in Table 1.

[0040] Table 1

[0041]

[0042] II. Examples 6-9

[0043] Using the QD purification solution prepared in Example 3 and polydimethylsiloxane adhesive as raw materials, an environmentally friendly and efficient lead-free perovskite quantum dot fluorescent solar collector was prepared. The difference between Examples 6 to 9 is that the weight ratio of QD to polydimethylsiloxane adhesive used is different. The specific amounts are shown in Table 2.

[0044] The preparation method of the fluorescent solar concentrators in Examples 6-9 includes the following steps:

[0045] S2.1 Dilute the QD purified solution with n-hexane to obtain a QD diluent (the quantum dot concentrations of the QD diluents in Examples 6-9 are 1.5 mg / mL, 3 mg / mL, 4.5 mg / mL, and 6 mg / mL, respectively). Take 1 mL of the QD diluent and mix it evenly with polydimethylsiloxane gel to form a mixture. Place the mixture in a vacuum pump and degas for 30 minutes to obtain the prepolymer of the fluorescent solar collector.

[0046] S2.2 Pour the prepolymer of the fluorescent solar collector into a mold, heat it to 120°C and keep it at that temperature for 1 hour to cure it. After demolding, you will get the environmentally friendly, high-efficiency, lead-free perovskite quantum dot fluorescent solar collector QD-LSC.

[0047] The fluorescent solar collectors prepared in Examples 6 to 9 were named QD-LSC1, QD-LSC2, QD-LSC3, and QD-LSC4, respectively.

[0048] Table 2

[0049] Specific examples / naming QD(mg) PDMS glue (g) Example 6 / QD-LSC1 1.5 16.5 Example 7 / QD-LSC2 3 16.5 Example 8 / QD-LSC3 4.5 16.5 Example 9 / QD-LSC4 6 16.5

[0050] The raw materials and additives used in Examples 1-5 and Comparative Example 1 were all purchased from Aladdin Reagent Network. The poly(dimethyl-methylvinylsiloxane) adhesive (PDMS adhesive) used in Examples 6-9 was purchased from Dow Corning, model Dow Corning 184.

[0051] III. Analysis of Experimental Results

[0052] The QD purified solutions prepared in Examples 1-5 and Comparative Example 1, and the QD-LSCs prepared in Examples 6-9 were subjected to performance characterization tests.

[0053] Figure 1 The luminescence spectra (PL) and quantum efficiency (PLQY) of the QD purification solutions prepared in Examples 1-5 and Comparative Example 1 as a function of Bi 3+ The curve showing the change in doping concentration. From... Figure 1(a) As can be seen, under 365nm ultraviolet light excitation, the quantum dot of Comparative Example 1 emits only weak blue light (emission peak at 475nm), and the spectral peak shape has a long tail. In contrast, the quantum dots of Examples 1-5 emit bright orange light (emission peak at 580nm), and the spectral peak shape is a uniformly distributed emission peak. The above phenomenon is because: the quantum dot of Comparative Example 1 has a large number of defects on its surface. After the charge carriers are excited, they jump from the valence band to the conduction band of the quantum dot, and are captured by the surface defects and relax back to the ground state without radiation, resulting in the quantum dot of Comparative Example 1 emitting only weak blue light. When Bi is introduced... 3+ Subsequently, the surface defects of the quantum dots were passivated, causing the quantum dots of Examples 1-5 to emit bright orange light. From Figure 1 (b) It can be seen that by increasing Bi 3+ With a certain doping concentration, the photoluminescence intensity and quantum efficiency (21%) of the quantum dots in Example 3 reached their maximum.

[0054] Figure 2 The absorption spectrum (purple solid line), emission spectrum (orange solid line), AM 1.5 spectrum (gray background) of the QD purified solution in Example 3, and EQE spectrum (red dashed line) of a commercial Si solar cell are shown. Figure 2 It can be observed that the absorption and emission spectra of the strongest luminescent quantum dot exhibit a large Stokes shift (approximately 244 nm), indicating that the quantum dot of Example 3 can effectively suppress the reabsorption loss of the LSC. Furthermore, the emission wavelength range of this quantum dot covers the entire visible light wavelength region of 450–750 nm, which better matches the EQE spectrum of commercial silicon solar cells, thus contributing to improved photoelectric conversion efficiency of the LSC device.

[0055] Figure 3 The images show actual samples of the fluorescent solar collectors prepared in Examples 6-9. As can be seen, under ultraviolet light, the edges of the devices prepared in Examples 6-9 emit a bright orange light.

[0056] Figure 4 The edge efficiency (η) of the fluorescent solar concentrator samples prepared in Examples 6-9 edge ), quantum efficiency (η) LSC,PL ), internal quantum efficiency (η) int The graph shows the relationship between quantum dot concentration and quantum dot concentration. Figure 4 It can be seen that the quantum efficiency of the device sample in Example 7 (quantum dot concentration of 3 mg / mL) is as high as 46.59%, which is twice that of the quantum dot quantum efficiency of Example 3. This phenomenon is due to the passivation effect of the long siloxane chains in PDMS on the surface defects of the quantum dots, which further enhances the radiative recombination of the quantum dots, thus leading to the improvement in the quantum efficiency of the device sample in Example 7. Figure 4It can also be seen that further increasing the quantum dot concentration decreases the quantum efficiency of the device. This is because as the number of quantum dots increases, they aggregate inside the device, increasing the probability of photons being scattered from the device surface, leading to increased scattering loss and ultimately reducing the quantum efficiency of the device samples in Examples 8-9. Similarly, due to increased scattering loss, the edge efficiency of the device samples in Examples 6-9 decreases with increasing quantum dot concentration. Based on both quantum efficiency and edge efficiency, the device sample in Example 7 achieves an internal quantum efficiency as high as 41.7%, indicating that this QD-LSC device can effectively absorb, convert, and transmit photons, increasing the luminous flux per unit area of ​​commercial Si solar cells and ultimately improving the photoelectric conversion efficiency of solar cells.

[0057] Figure 5 The transmission spectra of the fluorescent solar collector samples prepared in Examples 6-9 are shown. Figure 5 As can be seen, even at the maximum quantum dot concentration of 6 mg / mL, the transmittance of the device to visible light remains above 80%, indicating that the QD-LSC device of this invention meets the dual requirements of building-integrated photovoltaics for the transparency and photoelectric performance of building materials.

[0058] Figure 6 This image illustrates the flexibility of the fluorescent solar concentrator sample prepared in Example 7. From... Figure 6 It can be seen that the prepared QD-LSC device has excellent flexibility, indicating that the QD-LSC device of the present invention can be flexibly adjusted in shape and is more compatible with buildings, providing an effective solution for the further commercialization of perovskite quantum dot fluorescent solar concentrators.

Claims

1. An environmentally friendly, high-efficiency, lead-free perovskite quantum dot fluorescent solar concentrator, characterized in that, The composition of the fluorescent solar concentrator comprises a transparent optical waveguide matrix and fluorescent luminophores dispersed in the transparent optical waveguide matrix, the transparent optical waveguide matrix is polydimethylsiloxane, and the fluorescent luminophores are Bi 3+ Doped lead-free perovskite quantum dots Cs2Na 0.6 Ag 0.4 InCl6, the molar composition expression of the fluorescent luminophores is Cs2Na 0.6 Ag 0.4 In 1-x Bi x Cl6, wherein x Bi 3+ The doping molar fraction, x The value range of Bi is 0.01-0.2, and the siloxane long chain of polydimethylsiloxane is bonded to the Bi 3+ The surface ligand of the doped lead-free perovskite quantum dots is bonded.

2. The method for preparing the environmentally friendly, high-efficiency, lead-free perovskite quantum dot fluorescent solar concentrator according to claim 1, characterized in that, Includes the following steps: Preparation and purification of S1 and QD stock solutions S1.1 Weighing raw materials According to the expression Cs2Na 0.6 Ag 0.4 In 1-x Bi x The molar composition of Cl6 was calculated and the raw materials were weighed, wherein Cs, Na, Ag, In, Bi, and Cl were added in the form of raw materials CsCH3COO, NaOH, AgCH3COO, In(CH3COO)3, Bi(CH3COO)3, and TMS-Cl, respectively. S1.2, Synthetic QD stock solution 191.95 mg of CsCH3COO, 12 mg of NaOH, 33.38 mg of AgCH3COO, 144.52–116.78 mg of In(CH3COO)3, and 1.93–38.61 mg of Bi(CH3COO)3 were added to a three-necked flask. Then, 10 mL of octadecene, 1 mL of oleic acid, and 0.25 mL of oleylamine were added to obtain a mixed solution. This solution was evacuated at room temperature for 30–60 minutes. Nitrogen gas was then introduced into the three-necked flask, and the solution was heated to 100–120 °C. This temperature was maintained at 100–120 °C while stirring for 30–60 minutes until all the raw materials were completely dissolved, yielding a quantum dot precursor solution. The quantum dot precursor solution was then heated to 175–185 °C, and 0.6 mL of the solution was rapidly injected into the three-necked flask. Add mL of TMS-Cl, and after 5-10 seconds, transfer the three-necked flask to an ice bath in ice water until room temperature, thus synthesizing the QD stock solution; S1.3, Purification of QD stock solution Take 2 mL of QD stock solution from a three-necked flask and add it to a centrifuge tube. Then, inject 6 mL of n-hexane into the centrifuge tube and mix it with the QD stock solution to obtain a mixed solution. Centrifuge the mixed solution at 7000-8000 rpm for 10 minutes. After centrifugation, retain the precipitate. Then, inject 6 mL of a mixture of ethyl acetate and n-hexane into the centrifuge tube and mix it with the precipitate. Centrifuge the resulting mixed solution at 7000-8000 rpm for 10 minutes. After centrifugation, retain the precipitate. Then, disperse the obtained precipitate in 5 mL of n-hexane and centrifuge at 3000 rpm for 3-5 minutes. Retain the supernatant, which is the QD purified solution. S2. Preparation of fluorescent solar concentrators S2.1 Dilute the QD purified solution with n-hexane to obtain a QD dilution solution with a quantum dot concentration of 1.5-6 mg / mL. Mix the QD dilution solution with polydimethylsiloxane gel uniformly to form a mixture. The weight ratio of QD to polydimethylsiloxane gel in the mixture is (0.0003-0.0012): 3.

3. Place the mixture in a vacuum pump and degas for 30-60 minutes to obtain the prepolymer of the fluorescent solar collector. S2.2 Pour the prepolymer of the fluorescent solar collector into a mold, heat it to 100~120℃ and keep it at that temperature for 1~2 hours to cure it. After demolding, you will get an environmentally friendly, high-efficiency, lead-free perovskite quantum dot fluorescent solar collector.

3. The method for preparing the environmentally friendly, high-efficiency, lead-free perovskite quantum dot fluorescent solar concentrator according to claim 2, characterized in that, In the mixture of ethyl acetate and n-hexane, the volume ratio of ethyl acetate to n-hexane is 1:3.

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