Light-induced spontaneous magnetization organic-inorganic hybrid lead halide perovskite material and preparation thereof

Abstract

The invention discloses a light-induced spontaneous magnetization organic-inorganic hybrid lead halide perovskite material and a preparation method thereof. The structural general formula of the compound is APb2X6 (A = CnH2n + 6N2; x is Cl, Br or I), n represents the length of an alkyl chain, an obtained sample can induce a spontaneous magnetization phenomenon of a material through light under the condition that an external magnetic field is not needed, an internal magnetic field generated by an electron-hole spin exchange effect is about 255T, the spontaneous magnetization temperature is 90K, and meanwhile, the spontaneous magnetization causes that the electron and hole recombination life reaches more than ten microseconds; the light-induced spontaneous magnetization organic-inorganic hybrid lead halide perovskite material disclosed by the invention can provide a carrier platform for high-efficiency spin control at high temperature.

Description

Technical Field

[0001] The present invention relates to an organic-inorganic hybrid lead halide perovskite material, and in particular to an organic-inorganic hybrid lead halide perovskite material with light-induced spontaneous magnetization and a preparation method thereof. Background Art

[0002] Spin manipulation is a very important technology in future semiconductor spin electronics and spin photonics.

[0003] However, the rapid dynamics of excitons and the demanding low-temperature operating conditions make spin manipulation a significant challenge. Furthermore, the magnetic saturation of the material requires low temperatures and a strong external magnetic field. Therefore, if spontaneous magnetization of the material could be achieved at higher temperatures, this would bring unlimited potential to the application of semiconductor materials.

[0004] One strategy for achieving spontaneous magnetization is to spatially confine excitons within morphologically controllable quantum dots. Hybrid lead halide semiconductor materials offer a tunable structure. By selecting appropriate organic compounds, the inorganic semiconductor backbone of the hybrid material can be manipulated from three dimensions to two and one dimensions. This reduction in dimensionality creates quantum wells with quantum confinement effects. Due to the soft lattice properties of the hybrid material, excitons generated by illumination are rapidly trapped by the resulting distorted lattice, resulting in a stronger quantum confinement effect than most pure inorganic semiconductors.

[0005] Electron-air recombination produces broadband self-trapped exciton emission. Simultaneously, the Stokes shift in STE emission is large due to the relaxation of the distorted lattice after trapping excitons. Electrons and holes generate an internal magnetic field through sp superexchange interactions, but this process is significantly influenced by various dynamic processes, such as phonon coupling, photoexcitation energy transfer, radiative decay, and spin dipole-dipole interactions. The confinement effect of STE in organic-inorganic hybrid materials strengthens the electron-hole sp superexchange spin interaction, making it easier to achieve a spontaneous magnetization state, which is beneficial for spin manipulation. Summary of the Invention

[0006] The purpose of the present invention is to overcome the shortcomings and deficiencies of the above-mentioned prior art and provide an organic-inorganic hybrid lead halide perovskite material with light-induced spontaneous magnetization and its preparation.

[0007] The organic-inorganic hybrid lead halide perovskite material of the present invention does not require an external magnetic field. Under ultraviolet light excitation, the material itself has a very large effective internal magnetic field in the STE, which can induce spontaneous magnetization at a temperature as high as 90K.

[0008] By further optimizing the quantum confinement effect and spin dynamics properties of the material, the present invention is expected to achieve efficient spin manipulation at room temperature in the future, thus opening up new prospects for the application of semiconductor materials.

[0009] The present invention is achieved through the following technical solutions:

[0010] A photoinduced spontaneous magnetization organic-inorganic hybrid lead halide perovskite material, whose structural characteristics are that the inorganic framework is formed by coplanar lead halide groups extending along certain specific axes to form a 1D structure, surrounded by organic cations. Its structural formula is APb2X6(A=C n H 2n+6 N2; X=Cl, Br, I). It exhibits good red fluorescent STE emission under ultraviolet light irradiation, with the Stokes shift remaining almost unchanged below 90K, and the electron-hole recombination lifetime decreasing from 16ns at room temperature to 4μs at 90K, making it an excellent quantum optical material.

[0011] Furthermore, the hybrid lead halide perovskite material with light-induced spontaneous magnetization is characterized in that the halogen ion is Cl - Br - , I - One or more of the organic ions are C 12 H 30 N + or C 16 H 38 N + .

[0012] Furthermore, the hybrid lead halide perovskite material with light-induced spontaneous magnetization is in a crystalline form, and in the space group P2 / c, the unit cell parameter a is b is c is α is 90.0°, γ is 90.0°, and β is 99.2-100°.

[0013] A method for preparing an organic-inorganic hybrid lead halide perovskite material with light-induced spontaneous magnetization:

[0014] Bulk crystal preparation:

[0015] (1) adding a halide salt containing organic ions to solvent 1 and dissolving it uniformly to obtain solution 1; adding lead halide or its hydrate to solvent 1 and dissolving it uniformly to obtain solution 2; in the bulk crystal preparation step (1), the concentration of the halide salt containing organic ions in solution 1 is 0.2-1 mmol / mL. In the solution 2, the concentration of lead halide is 0.17-0.25 mmol / mL; the halide salt containing organic ions is a hexahydrocarbyl quaternary ammonium halide or a decahydrocarbyl quaternary ammonium halide, wherein the anion of the halide salt is selected from Cl-, Br-, and I-; the anion of the manganese halide is independently selected from Cl-, Br-, and I-; and the solvent 1 is hydrochloric acid, hydrobromic acid, or hydroiodic acid.

[0016] (2) slowly titrating solution 1 into solution 2, and obtaining colorless prismatic crystals at room temperature overnight, which are the hybrid lead halide perovskite bulk crystal material with photoinduced spontaneous magnetization. The volume ratio of solution 1 to solution 2 is 1:2.4-1:8;

[0017] Powder crystal preparation:

[0018] (1) Adding a halide salt containing organic ions to solvent 1 and dissolving it uniformly to obtain solution 1; adding lead halide or its hydrate to solvent 1 and dissolving it uniformly to obtain solution 2. In the solution 1, the concentration of the halide salt containing organic ions is 0.2-1 mmol / mL, and in the solution 2 of step (1), the concentration of lead halide is 0.2-0.33 mmol / mL. The halide salt containing organic ions is a hexahydrocarbyl quaternary ammonium halide or a decahydrocarbyl quaternary ammonium halide, wherein the anion of the halide salt is selected from Cl-, Br-, and I-; the anion of the manganese halide is independently selected from Cl-, Br-, and I-; and the solvent 1 is hydrochloric acid, hydrobromic acid, or hydroiodic acid.

[0019] (2) Solution 1 is slowly titrated into solution 2 to immediately obtain a white powder. After removing the supernatant, the precipitate is washed with anhydrous ethanol and then centrifuged twice. The precipitate is washed again with anhydrous ethanol. Finally, the sample is dried to obtain the hybrid lead halide perovskite powder crystalline material with photoinduced spontaneous magnetization. The volume ratio of solution 1 to solution 2 is 1:2-1:6.

[0020] The crystallization treatment time in the block crystal step (2) is 120-240 hours.

[0021] The drying temperature of the powder crystal in step (2) is 55-60° C. and the drying time is 12-24 hours.

[0022] Compared with the prior art, the present invention has the following advantages and effects:

[0023] The organic-inorganic hybrid lead halide perovskite material with light-induced spontaneous magnetization exhibits good red fluorescence under ultraviolet light irradiation, and has a strong fluorescence effect under 370nm excitation, making it an optical material with excellent performance.

[0024] The organic-inorganic hybrid lead halide perovskite material with photoinduced spontaneous magnetization of the present invention has a photoinduced spontaneous magnetization phenomenon without the need for an external magnetic field. According to theoretical calculations, its exchange field is about 255T. At the same time, the ferromagnetic coupling between STE electrons and holes greatly prolongs the emission decay, opening up new prospects for achieving efficient spin manipulation at high temperatures.

[0025] The preparation process of the invention is simple and easy to implement, has high yield, is low cost and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a comparison chart of the XRD pattern of the light-induced spontaneous magnetization hexahydrogen quaternary ammonium bromide hybrid lead bromide perovskite material prepared in Example 1 and the single crystal data fitting. The XRD patterns of decahydrogen quaternary ammonium bromide hybrid lead bromide perovskite material, hexahydrogen quaternary ammonium iodide hybrid lead bromide perovskite and other materials are similar.

[0027] Figure 2 The fluorescence spectrum of the hexahydrocarbon quaternary ammonium bromide hybrid lead bromide perovskite material prepared in Example 1, the decahydrocarbon quaternary ammonium bromide hybrid lead bromide perovskite material, the hexahydrocarbon quaternary ammonium iodide hybrid lead bromide perovskite material and other materials have similar temperature-dependent fluorescence spectra.

[0028] Figure 3 The fluorescence lifetime diagram of the hexahydroquinone quaternary ammonium bromide hybrid lead bromide perovskite material prepared in Example 1 is similar to the fluorescence lifetime diagrams of the decahydroquinone quaternary ammonium bromide hybrid lead bromide perovskite material, the hexahydroquinone quaternary ammonium iodide hybrid lead bromide perovskite material, and the like.

[0029] Figure 4 The temperature-dependent fluorescence lifetime diagrams of the hexahydrocarbon quaternary ammonium bromide hybrid lead bromide perovskite material prepared in Example 1 are similar to those of the decahydrocarbon quaternary ammonium bromide hybrid lead bromide perovskite material, the hexahydrocarbon quaternary ammonium iodide hybrid lead bromide perovskite material, and the like.

[0030] Figure 5 The temperature-dependent fluorescence spectra of the hexahydrogen quaternary ammonium bromide hybrid lead bromide perovskite material prepared in Example 1 are similar to those of the decahydrogen quaternary ammonium bromide hybrid lead bromide perovskite material and the hexahydrogen quaternary ammonium iodide hybrid lead bromide perovskite material.

[0031] Figure 6 In order to collect the Stokes shift data of the temperature-dependent fluorescence spectrum of the hexahydroquinazone bromide hybrid lead bromide perovskite material prepared in Example 1, the internal exchange field intensity fitting diagram of the material was obtained according to the Brillouin function. The internal exchange field intensity fitting diagrams of the decahydroquinazone bromide hybrid lead bromide perovskite material, the hexahydroquinazone iodide hybrid lead bromide perovskite material and the like were similar.

[0032] Figure 7 The magneto-optical spectrum of the hexahydrocarbon quaternary ammonium bromide hybrid lead bromide perovskite material prepared in Example 1 is similar to the magneto-optical spectrum of the decahydrocarbon quaternary ammonium bromide hybrid lead bromide perovskite material, the hexahydrocarbon quaternary ammonium iodide hybrid lead bromide perovskite material, and the like. DETAILED DESCRIPTION

[0033] The present invention is described in further detail below with reference to specific embodiments.

[0034] Example 1:

[0035] The preparation method of hexahydroquaternary ammonium bromide hybrid lead bromide perovskite material comprises the following steps:

[0036] Block crystals:

[0037] (1) Place 2 mmol of PbBr2 in a container and add 10 ml of HBr to fully dissolve it.

[0038] (2) Take 1mmol C 12 H 30 Put Br2N2 into a container and add 2ml of HBr to fully dissolve it;

[0039] (3) C 12 H 30 Br2N2 solution was slowly titrated into PbBr2 solution. After standing at room temperature for 120h, C 12 H 30 N2Pb2Br6 colorless prismatic crystals.

[0040] Powder crystals:

[0041] (1) Place 2 mmol of PbBr2 in a container and add 8 ml of HBr to fully dissolve it.

[0042] (2) Take 1mmol C 12 H 30 Put Br2N2 into a container and add 2ml of HBr to fully dissolve it;

[0043] (4) C 12 H 30 Br2N2 solution was slowly titrated into PbBr2 solution. A white powder was immediately obtained. After removing the supernatant, the precipitate was washed with anhydrous ethanol and then centrifuged twice. The precipitate was washed with ethanol again. Finally, the sample was placed in an oven and dried at 60°C for 12 hours. C was obtained. 12 H 30 N2Pb2Br6 powder crystals.

[0044] The obtained crystals were subjected to relevant tests, and the specific data are as follows:

[0045] Crystal structure: X-ray diffractometer was used on a Bruker single crystal X-ray diffractometer using Cu Kα radiation monochromated by a graphite monochromator as the light source. Diffraction data were collected at room temperature using a β-ω scanning method within a certain angle range (0-90°). The structures of all data samples were analyzed and refined using SHELXL in the Olex 2 software package. 12 H 30 The luminescent material N2Pb2Br6 belongs to the monoclinic system and the space group P2 / c. See the crystal structure diagram Figure 1 , crystallographic data are shown in Table 1.

[0046] Powder X-ray diffraction: C 12 H 30 The powder X-ray diffraction patterns of N2Pb2Br6 were recorded using a Philips PW1830 X-ray powder diffractometer using Cu kα1 radiation. The measurement conditions are: tube voltage: 40 kV, tube current: 20 mA, Cu kα1 radiation scanning speed 1°·min -1 , step interval: 0.02°, scanning range (2θ): 5-90°, scanning mode is continuous scanning, see Figure 1 .from Figure 1 It can be seen that the experimentally observed XRD peaks are in good agreement with the XRD patterns obtained by bridging the crystal structure data, indicating that C 12 H 30 N2Pb2Br6 was successfully synthesized and had good crystallinity and purity.

[0047] Fluorescence spectrum analysis: The fluorescence spectra of the samples were recorded using an FL920 fluorescence spectrometer (Edinburgh Instruments Ltd.) equipped with a 450W xenon lamp as the excitation source. 12 H 30 The optimal excitation wavelength of N2Pb2Br6 is 370nm. When excited by ultraviolet light at 370nm, C 12 H 30 N2Pb2Br6 has a broad red peak at 720nm, see Figure 2 In the temperature range of 10-300K, the emission spectrum is obtained by exciting the material with the best excitation peak of 370nm, and the excitation spectrum with the strongest emission peak of 720nm is detected. The difference between the wavelength corresponding to 15% of the long-wave end of the excitation spectrum and the wavelength corresponding to 15% of the short-wave end of the emission wavelength is the Stokes shift. Figure 5 .

[0048] Fluorescence lifetime test: C 12 H 30 The fluorescence lifetime of N2Pb2Br6 was measured using a 150W nanosecond flash lamp (Hamamatsu Photonics C11367-11 Quantaurus Tau). When excited with UV light at 370nm, the fluorescence decay signal at the strongest emission peak at 720nm was detected. The curve was fitted with a single exponential decay equation and the lifetime was 16.45ns. Figure 3 In the temperature range of 10-300K, when excited by ultraviolet light at 370nm, the fluorescence decay signal with the strongest emission peak at 720nm is detected. The curve is a composite single exponential decay equation, and its fitting lifetime decreases from 4.44μs to 16.45ns. Figure 4 .

[0049] Magnetic field strength calculation: The following Brillouin function is used to fit the Stokes shift, where ∆E, C, and S are the energy, floating variable, and total spin quantum number of the Stokes shift. The fitting results show that there is a strong B in the material. eff (~255T), see Figure 6 .

[0050]

[0051] Magneto-optical measurements: The excitation light was provided by a solid-state laser with a wavelength of 360 nm. The spectra were collected by a spectrometer consisting of a monochromator (SP500i, Andor) and an electron multiplying charge-coupled device (EMCCD, Newton 970P, Andor). The sample was placed in a liquid helium cryostat at the center of a pulsed magnet with a peak magnetic field of 55 T and a pulse duration of 300 ms. In this setup, the EMCCD was exposed once every millisecond simultaneously with the magnetic field pulse period. For circularly polarized magnetic PL measurements, each polarizer (left / right) consisted of a quarter-wave plate and a thin-film linear polarizer with the angle between their axes set to +45° / -45° and placed between the fiber bundle and the sample. C 12 H 30 The emission peak of N2Pb2Br6 changes negligibly with the applied magnetic field at 4.2K. Figure 7 .

[0052] Table 1C 12 H 30 Crystallographic data of N2Pb2Br6

[0053]

[0054] Example 2:

[0055] The preparation method of decahydroquaternary ammonium bromide hybrid lead bromide perovskite material comprises the following steps:

[0056] Block crystals:

[0057] (1) Place 2 mmol of PbBr2 in a container and add 10 ml of HBr to fully dissolve it.

[0058] (2) Take 1mmol C 16 H 38 Put Br2N2 into a container and add 3ml of HBr to fully dissolve it;

[0059] (3) C 16 H 38 Br2N2 solution was slowly titrated into PbBr2 solution. After standing at room temperature for 120h, C 16 H 38N2Pb2Br6 colorless prismatic crystals.

[0060] Powder crystals:

[0061] (1) Place 2 mmol of PbBr2 in a container and add 8 ml of HBr to fully dissolve it.

[0062] (2) Take 1mmol C 16 H 38 Put Br2N2 into a container and add 3ml of HBr to fully dissolve it;

[0063] (3) C 16 H 38 Br2N2 solution was slowly titrated into PbBr2 solution. A white powder was immediately obtained. After removing the supernatant, the precipitate was washed with anhydrous ethanol and then centrifuged twice. The precipitate was washed with ethanol again. Finally, the sample was placed in an oven and dried at 60°C for 12 hours to obtain C 16 H 38 N2Pb2Br6 powder crystals.

[0064] Example 3:

[0065] The preparation method of hexahydroquinone iodide hybrid lead iodide perovskite material comprises the following steps:

[0066] Block crystals:

[0067] (1) Place 2 mmol of PbI2 in a container and add 12 ml of HI to fully dissolve it.

[0068] (2) Take 1mmol C 12 H 30 Put I2N2 into the container and add 4ml HI to dissolve it completely;

[0069] (3) C 12 H 30 I2N2 solution was slowly titrated into PbI2 solution. After standing at room temperature for 240h, C 12 H 30 N2Pb2I6 colorless prismatic crystals.

[0070] Powder crystals:

[0071] (1) Place 2 mmol of PbI2 in a container and add 10 ml of HI to fully dissolve it.

[0072] (2) Take 1mmol C 12 H 30 Put I2N2 into the container and add 4ml HI to dissolve it completely;

[0073] (4) C 12 H 30 I2N2 solution was slowly titrated into PbI2 solution. White powder was immediately obtained. After removing the supernatant, the precipitate was washed with anhydrous ethanol and then centrifuged twice. The precipitate was washed with ethanol again. Finally, the sample was placed in an oven and dried at 60°C for 24 hours to obtain C 12 H 30 N2Pb2I6 powder crystal.

[0074] Example 4:

[0075] The preparation method of decahydroquaternary ammonium iodide hybrid lead iodide perovskite material comprises the following steps:

[0076] Block crystals:

[0077] (1) Place 2 mmol of PbI2 in a container and add 12 ml of HI to fully dissolve it.

[0078] (2) Take 1mmol C 16 H 38 Put I2N2 into the container and add 5ml HI to dissolve it completely;

[0079] (3) C 16 H 38 I2N2 solution was slowly titrated into PbI2 solution. After standing at room temperature for 240h, C 16 H 38 N2Pb2I6 colorless prismatic crystals.

[0080] Powder crystals:

[0081] (1) Place 2 mmol of PbI2 in a container and add 10 ml of HI to fully dissolve it.

[0082] (2) Take 1mmol C 16 H 38 Put I2N2 into the container and add 5ml HI to dissolve it completely;

[0083] (4) C 16 H 38 I2N2 solution was slowly titrated into PbI2 solution. White powder was immediately obtained. After removing the supernatant, the precipitate was washed with anhydrous ethanol and then centrifuged twice. The precipitate was washed with ethanol again. Finally, the sample was placed in an oven and dried at 60°C for 24 hours to obtain C 16 H 38 N2Pb2I6 powder crystal.

[0084] Example 5:

[0085] The preparation method of hexahydrochloride quaternary ammonium hybrid lead iodide perovskite material comprises the following steps:

[0086] Block crystals:

[0087] (1) Place 2 mmol of PbCl2 in a container and add 8 ml of HCl to fully dissolve it.

[0088] (2) Take 1mmol C 12 H 30 Put Cl2N2 into a container and add 1ml HCl to fully dissolve it;

[0089] (3) C 12 H 30 Cl2N2 solution was slowly titrated into PbCl2 solution. After standing at room temperature for 120h, C 12 H 30 N2Pb2Cl6 colorless prismatic crystals.

[0090] Powder crystals:

[0091] (1) Place 2 mmol of PbCl2 in a container and add 6 ml of HCl to fully dissolve it.

[0092] (2) Take 1mmol C 12 H 30 Put Cl2N2 into a container and add 1ml HCl to fully dissolve it;

[0093] (4) C 12 H 30 Cl2N2 solution was slowly titrated into PbCl2 solution. A white powder was immediately obtained. After removing the supernatant, the precipitate was washed with anhydrous ethanol and then centrifuged twice. The precipitate was washed with ethanol again. Finally, the sample was placed in an oven and dried at 60°C for 12 hours to obtain C 12 H 30 N2Pb2Cl6 powder crystals.

[0094] The embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention shall be considered equivalent replacement methods and shall be included in the scope of protection of the present invention.

Claims

1. An organic-inorganic hybrid lead halide perovskite material with light-induced spontaneous magnetization, characterized in that: Its general structural formula is APb2X6(A=C n H 2n+6 N2; X=Cl, Br, I), where n represents the length of the alkyl chain; Inorganic framework shared by faces (PbX3) - The surface shares an extension along the a-axis to form a 1D structure surrounded by organic cations C n H 2n+6 N + ;Pb 2+ With the nearest Pb 2+ The distance between 2. The organic-inorganic hybrid lead halide perovskite material with light-induced spontaneous magnetization according to claim 1, characterized in that: In the hybrid lead halide perovskite material with photoinduced spontaneous magnetization, the halogen ion is Cl - Br - and / or I - ; Organic ion is C 12 H 30 N + or C 16 H 38 N + .

3. The organic-inorganic hybrid lead halide perovskite material with light-induced spontaneous magnetization according to claim 1, characterized in that: The hybrid lead halide perovskite material with photoinduced spontaneous magnetization is in crystalline form, and in the space group P2 / c, the unit cell parameter a is b is c is α is 90.0°, γ is 90.0°, and β is 99.2-100°.

4. The method for preparing the organic-inorganic hybrid lead halide perovskite material with light-induced spontaneous magnetization according to any one of claims 1 to 3, characterized in that: The steps include: S1, bulk crystal preparation steps: S1-1, adding a halide salt containing organic salt ions to solvent 1 and dissolving it uniformly to obtain solution 1; adding lead halide or its hydrate to solvent 1 and dissolving it uniformly to obtain solution 2; S1-2, slowly titrating solution 1 into solution 2 to obtain colorless prismatic crystals at room temperature overnight, thereby obtaining a hybrid lead halide perovskite bulk crystal material with photoinduced spontaneous magnetization; S2, powder crystal preparation steps: S2-1, adding a halide salt containing an organic salt ion to solvent 1 and dissolving it uniformly to obtain solution 1; adding lead halide to solvent 1 and dissolving it uniformly to obtain solution 2; S2-2, slowly titrate solution 1 into solution 2 to immediately obtain a white powder; after removing the supernatant, wash the precipitate with anhydrous ethanol and then centrifuge twice; wash the precipitate again with anhydrous ethanol; finally, dry the sample to obtain a hybrid lead halide perovskite powder crystal material with light-induced spontaneous magnetization.

5. The method for preparing the organic-inorganic hybrid lead halide perovskite material with light-induced spontaneous magnetization according to claim 4, characterized in that: The halide salt containing organic ions is a hexaalkyl quaternary ammonium halide salt or a decaalkyl quaternary ammonium halide salt, wherein the anion of the halide salt is selected from Cl-, Br- and / or I-; the anion in the manganese halide is independently selected from Cl-, Br- and / or I-; and the solvent 1 is hydrochloric acid, hydrobromic acid and / or hydroiodic acid.

6. The method for preparing the organic-inorganic hybrid lead halide perovskite material with light-induced spontaneous magnetization according to claim 4, characterized in that: In the solution 1 referred to in step S1-1 of preparing the bulk crystals, the concentration of the halide salt of the organic ion is 0.2-1 mmol / mL; The concentration of lead halide in solution 2 referred to in bulk crystal preparation step S1-1 is 0.17-0.25 mmol / mL; The volume ratio of solution 1 and solution 2 referred to in the bulk crystal preparation step S1-2 is 1:2.4-1:

8.

7. The method for preparing the organic-inorganic hybrid lead halide perovskite material with light-induced spontaneous magnetization according to claim 4, characterized in that: In the solution 1 referred to in step S2-1 of preparing the powder crystals, the concentration of the halide salt of the organic ion is 0.2-1 mmol / mL; In the solution 2 referred to in step S2-1 of preparing the powder crystals, the concentration of lead halide is 0.2-0.33 mmol / mL; The volume ratio of solution 1 and solution 2 in the powder crystal preparation step S2-2 is 1:2-1:

6.

8. The method for preparing the organic-inorganic hybrid lead halide perovskite material with light-induced spontaneous magnetization according to claim 4, characterized in that: The crystallization treatment time in the bulk crystal step S1-2 is 120-240 hours.

9. The method for preparing the organic-inorganic hybrid lead halide perovskite material with light-induced spontaneous magnetization according to claim 4, characterized in that: The drying temperature of the powder crystal in step S2-2 is 55-60°C and the drying time is 12-24 hours.

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