CN117025199A - Europium-doped chiral bismuth oxychloride and preparation method thereof - Google Patents
Europium-doped chiral bismuth oxychloride and preparation method thereof Download PDFInfo
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- BWOROQSFKKODDR-UHFFFAOYSA-N oxobismuth;hydrochloride Chemical compound Cl.[Bi]=O BWOROQSFKKODDR-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 229940073609 bismuth oxychloride Drugs 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title abstract description 12
- FBPFZTCFMRRESA-FSIIMWSLSA-N D-Glucitol Natural products OC[C@H](O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-FSIIMWSLSA-N 0.000 claims abstract description 43
- 239000000463 material Substances 0.000 claims abstract description 41
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 claims abstract description 18
- 229960002920 sorbitol Drugs 0.000 claims abstract description 18
- 235000010356 sorbitol Nutrition 0.000 claims abstract description 12
- 239000000126 substance Substances 0.000 claims abstract description 8
- 239000000243 solution Substances 0.000 claims description 19
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical group OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 18
- 150000002500 ions Chemical class 0.000 claims description 13
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 8
- 238000011049 filling Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 238000004729 solvothermal method Methods 0.000 claims description 7
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 6
- 229910017604 nitric acid Inorganic materials 0.000 claims description 6
- 229910001940 europium oxide Inorganic materials 0.000 claims description 5
- AEBZCFFCDTZXHP-UHFFFAOYSA-N europium(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Eu+3].[Eu+3] AEBZCFFCDTZXHP-UHFFFAOYSA-N 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 239000001103 potassium chloride Substances 0.000 claims description 4
- 235000011164 potassium chloride Nutrition 0.000 claims description 4
- 239000002904 solvent Substances 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 3
- 150000001621 bismuth Chemical class 0.000 claims description 2
- 238000001354 calcination Methods 0.000 claims description 2
- 238000004090 dissolution Methods 0.000 claims description 2
- 238000003837 high-temperature calcination Methods 0.000 claims description 2
- 239000007864 aqueous solution Substances 0.000 claims 1
- 238000001027 hydrothermal synthesis Methods 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 230000004298 light response Effects 0.000 abstract description 3
- -1 rare earth ion Chemical class 0.000 description 15
- 229910052761 rare earth metal Inorganic materials 0.000 description 12
- 238000002441 X-ray diffraction Methods 0.000 description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- 230000005284 excitation Effects 0.000 description 5
- 229910052693 Europium Inorganic materials 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000008367 deionised water Substances 0.000 description 3
- 229910021641 deionized water Inorganic materials 0.000 description 3
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 3
- 238000004020 luminiscence type Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000003960 organic solvent Substances 0.000 description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 description 3
- 238000012512 characterization method Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- OGPBJKLSAFTDLK-UHFFFAOYSA-N europium atom Chemical compound [Eu] OGPBJKLSAFTDLK-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000000643 oven drying Methods 0.000 description 2
- OZKCXDPUSFUPRJ-UHFFFAOYSA-N oxobismuth;hydrobromide Chemical compound Br.[Bi]=O OZKCXDPUSFUPRJ-UHFFFAOYSA-N 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- FBPFZTCFMRRESA-NQAPHZHOSA-N Sorbitol Chemical compound OCC(O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-NQAPHZHOSA-N 0.000 description 1
- 229910052769 Ytterbium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002983 circular dichroism Methods 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 239000005445 natural material Substances 0.000 description 1
- 238000005424 photoluminescence Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000000600 sorbitol Substances 0.000 description 1
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/02—Use of particular materials as binders, particle coatings or suspension media therefor
- C09K11/025—Use of particular materials as binders, particle coatings or suspension media therefor non-luminescent particle coatings or suspension media
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7728—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing europium
- C09K11/7729—Chalcogenides
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7728—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing europium
- C09K11/7732—Halogenides
Abstract
The invention discloses europium-doped chiral bismuth oxychloride and a preparation method thereof, and belongs to the technical field of chiral materials. The chemical formula of the europium-doped chiral bismuth oxychloride is XD/L-Bi 1‑y Eu y OCl, wherein X is 0.2-3, y is 0.01-0.3, D is D-sorbitol, L is L-sorbitol. The europium-doped chiral bismuth oxychloride has good light response characteristic, can directly generate down-conversion light emission, has stronger chiral light modulation efficiency, higher CD value than natural materials and high luminous efficiency.
Description
Technical Field
The invention belongs to the technical field of chiral materials, and particularly relates to europium-doped chiral bismuth oxychloride and a preparation method thereof.
Background
Optical materials with rare earth ion photoluminescence have been attracting more and more attention in recent years due to their application prospects in optical probes and sensors, advanced microscopes, three-dimensional displays, security tags, lasers, data storage, and the like. Generally, by doping rare earth ions into a host material, the rare earth ions will either replace the host material lattice sites or occupy the lattice interstices. Under excitation of the excitation light, the luminescent characteristic of the corresponding rare earth ions is emitted. Interestingly, the rare earth ion doped chiral luminescent material can also be used as chiral fluorescent powder.
Chiral molecules refer to molecules having a configuration or conformation that are not coincident with each other as opposed to their mirror images. Chiral molecules are increasingly required for chiral materials because they are capable of serving the health and high quality life of humans. However, the chiral material of natural substances has weak interaction with light, which limits the application of chiral photoresponsive properties in luminescence.
Bismuth oxychloride is a novel semiconductor material, particularly a bismuth oxychloride material with a two-dimensional structure, and has attracted general attention in the industry due to the excellent physical properties and chemical activities, but the property of the bismuth oxychloride doped with rare earth ions for emitting natural light is still weaker. The prior art combines bismuth oxychloride doped with rare earth ions with chiral molecules to prepare a novel chiral material, which can effectively improve the chiral light modulation efficiency and CD value (circular dichroism) of the material.
Patent CN115678558A relates to ytterbium and erbium-doped rare earth ion chiral bismuth oxychloride and a preparation method thereof, and the chemical general formula is Bi 1-x-y Er y Yb x O x-z Y, wherein X is Cl and/or Br, X is 0.05-0.3, Y is 0.001-0.1, z is 0.1-6, Y is D-sorbitol. The ytterbium-erbium-doped rare earth ion chiral bismuth oxychloride has good light response characteristics, stronger chiral light modulation efficiency, higher CD value and high luminous efficiency. However, the chiral bismuth oxychloride of the invention needs to be doped with two rare earth ions to improve the luminous efficiency.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides europium-doped chiral bismuth oxychloride and a preparation method thereof.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a europium-doped chiral bismuth oxychloride has a chemical formula of XD/L-Bi 1-y Eu y OCl, wherein X is 0.2-3, y is 0.01-0.3, D is D-sorbitol, L is L-sorbitol.
The chemical formula of the D-sorbitol and the L-sorbitol is C 6 H 14 O 6 。
As a preferred embodiment of the invention, the europium-doped chiral bismuth oxychloride is a two-dimensional powder material.
A preparation method of europium-doped chiral bismuth oxychloride comprises the following steps:
(1) Bismuth salt, europium oxide, potassium chloride and D-sorbitol or L-sorbitol are taken as raw materials, and Bi ions are used as follows: eu ion: the D/L-sorbitol molar ratio is (1-y): y: x is configured; adding concentrated nitric acid for dissolution, adding a solvent, finally preparing a solution with the total solution concentration of 0.1-3 mol/L, uniformly stirring, and regulating the pH value to 2-6 for solvothermal reaction;
(2) And (3) washing, drying and calcining the product obtained in the step (1) at high temperature to obtain europium-doped chiral bismuth oxychloride.
As a preferred embodiment of the present invention, in the step (1), the solvent is ethylene glycol or an aqueous ethylene glycol solution.
As a preferred embodiment of the present invention, in the step (1), the solvothermal reaction is carried out at a temperature of 110 to 250℃for a period of 2 to 25 hours.
More preferably, the solvothermal reaction is at 160 ℃ for 12 hours.
As a preferred embodiment of the invention, the hydrothermal kettle of the solvothermal reaction has a filling degree of 0.4-0.8.
As a preferred embodiment of the present invention, the high temperature calcination is performed at a temperature of 300 to 600℃for a time of 1 to 4 hours.
Compared with the prior art, the invention has the beneficial effects that:
(1) The europium-doped chiral bismuth oxychloride has good light response characteristic, can directly generate down-conversion light emission, has stronger chiral light modulation efficiency, higher CD value than natural materials and high luminous efficiency.
(2) The europium-doped chiral bismuth oxychloride is a two-dimensional inorganic nonmetallic semiconductor and information functional material, is expected to be used as a novel nano material, is used for luminescence enhancement, directly generates scientific research in the fields of down-conversion light emission and the like, and increases the exploration range in the field of chiral material scientific research.
Drawings
FIG. 1 is a 0.2D-Bi prepared in example 1 0.99 Eu 0.01 XRD pattern of OCl material;
FIG. 2 is a 0.2L-Bi prepared in example 2 0.99 Eu 0.01 XRD pattern of OCl material;
FIG. 3 is a 0.2D-Bi prepared in example 1 0.99 Eu 0.01 SEM profile of OCl material;
FIG. 4 shows 0.2L-Bi prepared in example 2 0.99 Eu 0.01 SEM profile of OCl material;
FIG. 5 is a 0.2D-Bi prepared in example 1 0.99 Eu 0.01 Chiral CD value profile of OCl material;
FIG. 6 is a 0.2L-Bi prepared in example 2 0.99 Eu 0.01 Chiral CD value profile of OCl material;
FIG. 7 is a 3D-Bi prepared in example 3 0.7 Eu 0.3 XRD pattern of OCl material;
FIG. 8 is a 3L-Bi prepared in example 4 0.7 Eu 0.3 XRD pattern of OCl material;
FIG. 9 shows a process of example 3Prepared 3D-Bi 0.7 Eu 0.3 SEM profile of OCl material;
FIG. 10 is a 3L-Bi prepared in example 4 0.7 Eu 0.3 SEM profile of OCl material;
FIG. 11 is a 3D-Bi prepared in example 3 0.7 Eu 0.3 Chiral CD value profile of OCl material;
FIG. 12 is a 3L-Bi prepared in example 4 0.7 Eu 0.3 Chiral CD value profile of OCl material;
FIG. 13 is a 3D-Bi prepared in example 3 under 365nm laser excitation 0.7 Eu 0.3 Luminous intensity spectrum of OCl material.
Detailed Description
For a better description of the objects, technical solutions and advantages of the present invention, the present invention will be further described with reference to the following specific examples.
Example 1
The preparation method of the europium-doped chiral bismuth oxychloride comprises the following steps:
(1) With Bi (NO) 3 ) 3 ·5H 2 O、Eu 2 O 3 D-sorbitol (D-Sor) and KCl as raw materials according to Bi ions: eu ion: D-Sor: molar ratio of Cl ions = 0.99:0.01:0.2:1, firstly dissolving europium oxide by using concentrated nitric acid, then dissolving all raw materials into an organic solvent glycol, and preparing a solution with the total solution concentration of 0.5 mol/L; adding the solution into a container, stirring and mixing uniformly, regulating the pH value to 6 by using hydrochloric acid with the concentration of 0.6mol/L, transferring into a hydrothermal kettle with a polytetrafluoroethylene lining, filling the kettle with the filling degree of 0.8, heating to 160 ℃, and preserving heat for 12 hours;
(2) Washing the material obtained in the step (1) with deionized water and ethanol for three times respectively, oven drying, and heat treating at 400deg.C for 3.5 hr to obtain the product with chemical composition formula of 0.2D-Bi 0.99 Eu 0.01 OCl doped europium chiral bismuth oxychloride fluorescent powder material.
Example 2
The preparation method of the europium-doped chiral bismuth oxychloride in this example is uniquely different from that in example 1 in that: the D-sorbitol in the step (1) is replaced by L-sorbitol with the same addition amount.
Characterization of the europium-doped chiral bismuth oxychloride phosphors prepared in examples 1 and 2 by X-ray diffraction means gave XRD patterns as shown in FIGS. 1 and 2, from which 0.2 mM/L-Bi doped with 0.2 mM/L sorbitol was observed 0.99 Eu 0.01 OCl shows a distinct and sharp diffraction peak, the peak position of which is highly matched with BiOCl of the layered structure of JCPDS card No. 06-0249.
The europium-doped chiral bismuth oxychloride prepared in examples 1 and 2 was characterized under an SEM scanning electron microscope, and the material showed a sparse and loose left-handed and right-handed flower ball morphology structure under an SEM scanning electron microscope, and the SEM morphology is shown in figures 3 and 4.
When the europium-doped chiral bismuth oxychloride prepared in examples 1 and 2 was tested by a circular dichromatic instrument, the positive and negative values of the chiral CD were found to be symmetrical and the peak values were consistent, which proves that the chiral bismuth oxychloride was endowed with chiral properties and functions, as shown in fig. 5 and 6.
Example 3
The preparation method of the europium-doped chiral bismuth oxychloride comprises the following steps:
(1) With Bi (NO) 3 ) 3 .5H 2 O, D/L-sorbitol (D-Sor) and KCl as raw materials according to Bi ions: eu ion: D-Sor: the molar ratio of Cl ions was 0.7:0.3:3:1, firstly dissolving europium oxide by using concentrated nitric acid, then dissolving all raw materials into mixed solution formed by water and glycol serving as an organic solvent to prepare solutions with the total solution concentration of 1.5mol/L respectively, then adding the solutions into a container, stirring and mixing uniformly, regulating the pH value to 6 by using nitric acid with the concentration of 0.7mol/L, transferring the solution into a hydrothermal kettle with a polytetrafluoroethylene lining, wherein the filling degree is 0.8, and then heating to 160 ℃ and preserving heat for 12 hours;
(2) Washing the material obtained in the step (1) with deionized water and ethanol for three times respectively, oven drying, and heat treating at 500deg.C for 4 hr to obtain 3D-Bi 0.7 Eu 0.3 OCl doped with europium chiral bismuth oxychloride.
Example 4
The preparation method of the europium-doped chiral bismuth oxychloride in this example is uniquely different from that in example 3 in that: the D-sorbitol in the step (1) is replaced by L-sorbitol with the same addition amount.
Characterization of the europium-doped chiral bismuth oxychloride phosphors prepared in examples 3 and 4 by X-ray diffraction means gave XRD patterns as shown in FIGS. 7 and 8, from which 3 mM-L-sorbitol-doped 3D/L-Bi was observed 0.7 Eu 0.3 OCl shows a distinct and sharp diffraction peak, the peak position of which is highly matched with BiOCl of the layered structure of JCPDS card No. 06-0249.
The europium-doped chiral bismuth oxychloride phosphors prepared in examples 3 and 4 were characterized under an SEM scanning electron microscope, and the material exhibited a sparse and loose morphology of left-handed and right-handed flower spheres under the SEM scanning electron microscope, and the SEM morphologies were shown in FIGS. 8 and 9.
When the europium-doped chiral bismuth oxychloride prepared in examples 3 and 4 was characterized by using a circular dichromatic instrument, the positive and negative values of the chiral CD were found to be symmetrical and the peak values were consistent, which proves that the chiral bismuth oxychloride was endowed with chiral properties and functions, as shown in fig. 10 and 11.
3D/L-Bi prepared in example 3 under 365nm laser excitation 0.7 Eu 0.3 The luminous intensity spectrum of OCl material is shown in FIG. 13.
Comparative example 1
The preparation method of the europium-doped rare earth ion chiral bismuth oxybromide comprises the following steps:
(1) With Bi (NO) 3 ) 3 ·5H 2 O、Eu 2 O 3 D-sorbitol (D-Sor) and KBr as raw materials, according to Bi ions: eu ion: D-Sor: molar ratio of Cl ions = 0.99:0.01:0.2:1, firstly dissolving europium oxide by using concentrated nitric acid, then dissolving all raw materials into an organic solvent glycol, and preparing a solution with the total solution concentration of 0.5 mol/L; adding the solution into a container, stirring and mixing uniformly, regulating the pH value to 6 by using hydrochloric acid with the concentration of 0.6mol/L, transferring into a hydrothermal kettle with a polytetrafluoroethylene lining, filling the kettle with the filling degree of 0.8, heating to 160 ℃, and preserving heat for 12 hours;
(2) Washing the material obtained in the step (1) with deionized water and ethanol for three times respectively, drying, and heating at 400 DEG CAfter 3.5 hours, the chemical composition formula of 0.2D-Bi is obtained 0.99 Eu 0.01 OBr europium-doped rare earth ion chiral bismuth oxybromide fluorescent powder material.
0.2D-Bi prepared in comparative example 1 under 365nm laser excitation 0.99 Eu 0.01 The OBr material has no luminescence phenomenon. Mainly because the bibir material cannot absorb 365nm light.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted equally without departing from the spirit and scope of the technical solution of the present invention.
Claims (8)
1. A europium-doped chiral bismuth oxychloride is characterized in that the chemical formula is XD/L-Bi 1-y Eu y OCl, wherein X is 0.2-3, y is 0.01-0.3, D is D-sorbitol, L is L-sorbitol.
2. The europium-doped chiral bismuth oxychloride according to claim 1, which is a two-dimensional powder material.
3. The method for preparing the europium-doped chiral bismuth oxychloride as claimed in claim 1 or 2, comprising the steps of:
(1) Bismuth salt, europium oxide, potassium chloride and D-sorbitol or L-sorbitol are taken as raw materials, and Bi ions are used as follows: eu ion: the D/L-sorbitol molar ratio is (1-y): y: x is configured; adding concentrated nitric acid for dissolution, adding a solvent, finally preparing a solution with the total solution concentration of 0.1-3 mol/L, uniformly stirring, and regulating the pH value to 2-6 for solvothermal reaction;
(2) And (3) washing, drying and calcining the product obtained in the step (1) at high temperature to obtain europium-doped chiral bismuth oxychloride.
4. The method of claim 3, wherein the solvent is ethylene glycol or an aqueous solution of ethylene glycol.
5. The method of preparing europium-doped chiral bismuth oxychloride according to claim 3, wherein the solvothermal reaction is carried out at a temperature of 110 to 250℃for a period of 2 to 25 hours.
6. The method of claim 5, wherein the solvothermal reaction is performed at 160℃for 12 hours.
7. The method for preparing europium-doped chiral bismuth oxychloride according to claim 3, wherein the hydrothermal reaction has a filling degree of 0.4 to 0.8.
8. The method of preparing europium-doped chiral bismuth oxychloride according to claim 3, wherein the high temperature calcination is carried out at a temperature of 300 to 600 ℃ for a period of 1 to 4 hours.
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