Cesium-yttrium-chloride lead-free perovskite intelligent response luminescent material capable of being triggered to change color through ethanol and preparation method of cesium-yttrium-chloride lead-free perovskite intelligent response luminescent material

Abstract

The invention relates to the field of intelligent response luminescent materials, in particular to a cesium-yttrium-chloride lead-free perovskite intelligent response luminescent material capable of being triggered to change color through ethanol and a preparation method of the cesium-yttrium-chloride lead-free perovskite intelligent response luminescent material. The chemical formula of the cesium yttrium chloride lead-free perovskite intelligent response luminescent material is Cs4YCl7: Sb, the preparation method comprises the following steps: dispersing Cs3YCl6: Sb in an organic solvent to obtain a precursor mixed solution; cesium salt is evenly mixed with glacial acetic acid and hydrochloric acid, and a CsCl solution is obtained; and adding the CsCl solution into the precursor mixed solution to react, and then centrifuging and drying to obtain the cesium yttrium chloride lead-free perovskite intelligent response luminescent material capable of being triggered to change color through ethanol. The caesium yttrium chloride lead-free perovskite intelligent response luminescent material has a high luminescent quantum yield; the method is a low-temperature solution method and is simple and convenient to operate; according to the invention, gram-level synthesis of the high-quality cesium-yttrium-chloride lead-free perovskite intelligent response luminescent material prepared by the solution method can be realized.

Description

Technical Field

[0001] The present invention relates to the field of intelligent response luminescent materials, and particularly to a cesium yttrium chloride lead-free perovskite intelligent response luminescent material that can be triggered to change color by ethanol and a preparation method thereof. Background Art

[0002] Solvatochromic materials have advantages such as low cost, good availability, and short response time, and have great application potential in information encryption and anti-counterfeiting. In the past decade, great progress has been made in the research on solvatochromic properties and materials. However, the synthesis and purification of traditional organic and composite solvatochromic materials are complex, and the production cost is high, which hinders their further application in information encryption and anti-counterfeiting. Therefore, it is urgently necessary to develop solvatochromic materials that are easy to prepare, have low manufacturing costs, and high luminous efficiency.

[0003] Lead halide perovskites have excellent optoelectronic properties, spectral tunability, and simple synthesis processes, and have been proven to be a promising solvatochromic material. However, the heavy metal lead (Pb) in lead-based metal halides poses a threat to the environment and human health. Therefore, developing a lead-free metal halide that not only has excellent optical properties but also is environmentally friendly is an urgently needed research direction. In recent years, copper-(Cu), antimony-(Sb), indium-(In), and manganese-(Mn)-based lead-free perovskite solvatochromic materials have shown great potential in anti-counterfeiting and information encryption. For example, the blue-emitting Cs 3 Cu 2 I 5 and the yellow-emitting CsCu 2 I 3 can undergo reversible conversion through water treatment and removal, and multiple encryption effects can be achieved by using waterproof Cs 3 Cu 2 I 5 @PMMA and the water-responsive Cs 3 Cu 2 I 5 In addition, the non-luminescent (t-BA) 3 Cu 6 I 9 can be transformed into the green-luminescent (t-BA) 2 Cu 2 I 4 ·H 2 O after reacting with water. In addition, Cs 2 InBr 5 ·H 2A transformation was also found to occur between O and its dehydrated mixture. Compared with the above-mentioned lead-free perovskites, the development of rare-earth-based lead-free perovskites with solvatochromic properties lags behind. Therefore, it is urgent and necessary to develop rare-earth-based lead-free halide perovskite intelligent response luminescent materials with good solvatochromic properties. Summary of the Invention

[0004] In view of the above deficiencies in the prior art, the present invention provides a cesium yttrium chloride lead-free perovskite intelligent response luminescent material that can be triggered to change color by ethanol and a preparation method thereof. The method of the present invention has the advantages of low temperature, simplicity, high quantum yield, and gram-scale synthesis.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] One of the technical solutions of the present invention is a cesium yttrium chloride lead-free perovskite intelligent response luminescent material that can be triggered to change color by ethanol, and its chemical formula is: Cs 4 YCl 7 :Sb; Cs 4 YCl 7 :Sb belongs to the hexagonal crystal system, and the corresponding space group is R-3m. Its structure is composed of a Cs 6 3- octahedron-containing Cs 2 InCl 6 layer and a Cs 2 Cl layer with six-fold disordered Cl ions; among the ions contained, the ionic radius of Y 3+ is The ionic radius of Cs + is The ionic radius of Sb 3+ is The doped Sb 3+ tends to replace Y 3+ more; the doping amount of Sb is 2.5% (compared with the molar number of Y).

[0007] Another technical solution of the present invention is a preparation method of the above-mentioned cesium yttrium chloride lead-free perovskite intelligent response luminescent material that can be triggered to change color by ethanol, including the following steps:

[0008] Disperse Cs 3 YCl 6 :Sb in an organic solvent to obtain a precursor mixture solution;

[0009] Mix a cesium salt with glacial acetic acid and hydrochloric acid to obtain a CsCl solution;

[0010] ​Add the CsCl solution to the precursor mixture for reaction, and then centrifuge and dry to obtain the lead-free cesium yttrium chloride perovskite intelligent response luminescent material that can be triggered to change color by ethanol.

[0011] In the third technical solution of the present invention, an information encryption material, the raw materials include the above-mentioned lead-free cesium yttrium chloride perovskite intelligent response luminescent material that can be triggered to change color by ethanol.

[0012] In the fourth technical solution of the present invention, an anti-counterfeiting material, the raw materials include the above-mentioned lead-free cesium yttrium chloride perovskite intelligent response luminescent material that can be triggered to change color by ethanol.

[0013] The present invention discloses the following technical effects:

[0014] 1. The present invention obtains a novel lead-free cesium yttrium chloride perovskite intelligent response luminescent material that can be triggered to change color by ethanol;

[0015] 2. The obtained luminescent material of the present invention has a high luminescence quantum yield;

[0016] 3. The method of the present invention is a low-temperature solution method, which is easy to operate;

[0017] 4. The present invention can realize the gram-scale synthesis of high-quality lead-free cesium yttrium chloride perovskite intelligent response luminescent material by solution method. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 X-ray diffraction spectrum (XRD) of the lead-free cesium yttrium chloride perovskite intelligent response luminescent material (Cs 4 YCl 7 :Sb) synthesized in Example 3 of the present invention.

[0020] Figure 2 Emission spectra (a) obtained by exciting the lead-free cesium yttrium chloride perovskite intelligent response luminescent material synthesized in Example 3 of the present invention with light of different wavelengths, and excitation spectra (b) obtained by monitoring with light of different wavelengths.

[0021] Figure 3 Screenshot of the test results of the luminescence quantum yield of the lead-free cesium yttrium chloride perovskite intelligent response luminescent material synthesized in Example 3 of the present invention.

[0022] Figure 4Photographs related to the luminescence color transition process of the cesium yttrium chloride lead-free perovskite intelligent response luminescent material synthesized in Example 3 of the present invention during the ethanol infiltration process.

[0023] Figure 5 Emission spectra of the cesium yttrium chloride lead-free perovskite intelligent response luminescent material synthesized in Example 3 of the present invention before and after ethanol infiltration. After ethanol infiltration, the emission peak shifts from 588 nm to 538 nm. Detailed implementation manners

[0024] Now, various exemplary embodiments of the present invention will be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, characteristics, and implementation manners of the present invention.

[0025] It should be understood that the terms used in the present invention are only for describing specific implementation manners and are not used to limit the present invention. Additionally, for the numerical ranges in the present invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Any intermediate value within any stated value or stated range, as well as each smaller range between any other stated value or intermediate value within the stated range, is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded from the range.

[0026] Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention pertains. Although the present invention only describes preferred methods and materials, any methods and materials similar or equivalent to those described herein can also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials related to the documents. In case of conflict with any incorporated document, the content of this specification shall prevail.

[0027] Without departing from the scope or spirit of the present invention, various improvements and changes can be made to the specific implementation manners of the present invention specification, which are obvious to those skilled in the art. Other implementation manners obtained from the specification of the present invention are obvious to those skilled in the art. The specification and examples of the present invention are only exemplary.

[0028] Regarding the terms "comprising", "including", "having", "containing", etc. used herein, they are all open-ended terms, meaning including but not limited to.

[0029] The first aspect of the present invention provides a cesium yttrium chloride lead-free perovskite intelligent response luminescent material that can be triggered to change color by ethanol, with the chemical formula: Cs 4 YCl 7 :Sb; Cs 4 YCl 7: Sb belongs to the hexagonal crystal system, and the corresponding space group is R-3m. Its structure consists of Cs 6 3- octahedra containing isolated [InCl 2 and Cs 6 InCl 2 layers with six-fold disordered Cl ions and Cs 4 Cl layers; among the ions contained in Cs 7 YCl 3+ :Sb, the ionic radius of Y is + for Cs, and the ionic radius of Cs is 3+ for Sb, and the ionic radius of Sb is 3+ Therefore, the doped Sb 3+ tends to replace Y more; the doping amount of Sb is 2.5% (compared to the molar number of Y).

[0030] The second aspect of the present invention provides a preparation method of the above-mentioned lead-free cesium yttrium chloride perovskite intelligent response luminescent material that can be triggered to change color by ethanol, including the following steps:

[0031] Disperse Cs 3 YCl 6 :Sb in an organic solvent to obtain a precursor mixture;

[0032] Mix a cesium salt with glacial acetic acid and hydrochloric acid to obtain a CsCl solution;

[0033] Add the CsCl solution to the precursor mixture for reaction, then centrifuge and dry to obtain the lead-free cesium yttrium chloride perovskite intelligent response luminescent material that can be triggered to change color by ethanol.

[0034] The present invention also attempts to dissolve cesium salt (Cs salt), Y salt and Sb salt in a solvent according to the stoichiometric ratio of Cs 4 YCl 7 :Sb to prepare a precursor solution, and then add an anti-solvent solution to make a precipitate form in the reaction system. The results show that the green-emitting Cs 3 YCl 6 :Sb luminescent material is obtained in this way, rather than the Cs 4 YCl 7 :Sb product. Only when Cs 3 YCl 6 :Sb is dispersed in a solvent in powder form and then reacted with CsCl can the Cs 4 YCl 7 :Sb product be obtained.

[0035] ​In a preferred embodiment of the present invention, the organic solvent is isopropanol; the Cs 3 YCl 6 :Sb to the mass-volume ratio of the organic solvent is 1.5 g:(6 - 10) mL.

[0036] In a preferred embodiment of the present invention, the mass-volume ratio of the cesium salt to the glacial acetic acid and hydrochloric acid is (0.1 - 0.6) g:3 mL:1 mL.

[0037] In a preferred embodiment of the present invention, the mass ratio of the Cs 3 YCl 6 :Sb to the cesium salt is 1.5:(0.1 - 0.6); the cesium salt is cesium carbonate.

[0038] In the present invention, too little Cs salt is not sufficient to completely convert Cs 3 YCl 6 :Sb into Cs 4 YCl 7 :Sb, and too much Cs salt will lead to an increase in non-luminescent particles, affecting the luminescence effect of the product. Therefore, the present invention limits the mass ratio of the Cs 3 YCl 6 :Sb to the cesium salt within the above ratio range.

[0039] In a preferred embodiment of the present invention, the temperature of the reaction is 40 °C and the time is 6 - 9 hours.

[0040] The reaction is carried out under stirring conditions, and the stirring speed is 1000 r / min. The purpose of stirring is to promote the contact between Cs 3 YCl 6 :Sb and the cesium salt, and to ensure that the entire mixed solution is heated evenly.

[0041] The present invention does not make special limitations on the drying temperature, and the drying temperature and time well-known to those skilled in the art can be used. For example, drying at 100 °C for 12 hours.

[0042] In a preferred embodiment of the present invention, the preparation method of the Cs 3 YCl 6 :Sb includes the following steps:

[0043] Mix yttrium carbonate, cesium carbonate, glacial acetic acid and hydrochloric acid to obtain a precursor solution;

[0044] Add the precursor solution to an antisolvent solution, then centrifuge. The obtained precipitate is washed and dried to obtain the Cs 3 YCl 6 :Sb.

[0045] In a preferred embodiment of the present invention, the anti-solvent solution is a mixture of antimony acetate and acetonitrile with a mass-to-volume ratio of 0.015 g:20 mL;

[0046] The mass-to-volume ratios of yttrium carbonate, cesium carbonate, glacial acetic acid, and hydrochloric acid are 0.36 g:1 g:6 mL:1.5 mL;

[0047] The mass ratio of cesium carbonate to antimony acetate is 1:0.015.

[0048] The obtained product is a type of high-quality rare-earth-based lead-free perovskite intelligent luminescent material. Currently, the research on lead-free perovskites with solvatochromic properties mainly focuses on directions such as copper-(Cu), antimony-(Sb), indium-(In), manganese-(Mn) based, etc., and certain achievements have been obtained. However, the preparation of high-quality rare-earth-based lead-free perovskite intelligent luminescent materials remains a challenge.

[0049] The present invention utilizes the reaction of Cs 3 YCl 6 :Sb and CsCl in solution to easily obtain high-quality cesium yttrium chloride lead-free perovskite intelligent response luminescent materials that can be triggered to change color by ethanol. Using Cs 3 YCl 6 :Sb as the precursor material, in the provided mixed solvent (isopropyl alcohol / glacial acetic acid / hydrochloric acid), CsCl can effectively insert into the Cs 3 YCl 6 :Sb lattice, thereby forming a Cs 4 YCl 7 :Sb phase. The Cs 4 YCl 7 :Sb luminescent material will decompose into Cs 3 YCl 6 :Sb and CsCl after being infiltrated with ethanol, accompanied by a transition from yellow emission to green emission. This change in luminescence color benefits from the different emission properties of Sb ions in different structures.

[0050] The third aspect of the present invention provides an information encryption material, the raw materials of which include the above-mentioned cesium yttrium chloride lead-free perovskite intelligent response luminescent material that can be triggered to change color by ethanol.

[0051] The fourth aspect of the present invention provides an anti-counterfeiting material, the raw materials of which include the above-mentioned cesium yttrium chloride lead-free perovskite intelligent response luminescent material that can be triggered to change color by ethanol.

[0052] The technical solutions of the present invention, unless otherwise specified, are all conventional solutions in the art. The reagents or raw materials used, unless otherwise specified, are all purchased from commercial channels or have been made public.

[0053] Cs used in the examples of the present invention3 YCl 6 :Sb luminescent materials have green emission properties and are prepared by the room-temperature anti-solvent method. The specific steps are as follows: First, weigh 0.36 g of yttrium carbonate and 1 g of cesium carbonate into a 20 mL reagent bottle, then add 6 mL of glacial acetic acid and 1.5 mL of hydrochloric acid, and stir well to finally obtain a colorless and clear precursor solution. Add 0.015 g of antimony acetate and 20 mL of acetonitrile to a 50 mL beaker, and obtain a colorless and clear anti-solvent solution by stirring. Then pour all of the precursor solution into the stirring anti-solvent solution to form a white powder. Transfer the obtained mixed solution to a 50 mL centrifuge tube, centrifuge at 2000 r / min for 2 min, and remove the supernatant to obtain a precipitate. Then add 20 mL of acetonitrile to the precipitate for washing, and centrifuge at 2000 r / min for 2 min, and remove the supernatant to obtain a precipitate. Finally, place the precipitate in a vacuum drying oven and dry at 100 °C for 12 hours to obtain a dry powder, which is Cs 3 YCl 6 :Sb luminescent materials. The Cs 3 YCl 6 :Sb luminescent material preparation method refers to Chinese invention patent CN 116285990 B. The obtained Cs 3 YCl 6 :Sb luminescent materials belong to the monoclinic system, the space group is C2 / c, and the Sb doping amount is 2.5% (compared to the molar number of Y).

[0054] The hydrochloric acid used in the examples of the present invention is concentrated hydrochloric acid with a mass fraction of about 37%.

[0055] The technical solutions provided by the present invention will be described in detail below with reference to the examples, but they should not be construed as limiting the protection scope of the present invention.

[0056] Example 1

[0057] First, weigh 1.5 g of Cs 3 YCl 6 :Sb luminescent materials into a 20 mL reagent bottle, then add 6 mL of isopropanol, and stir well to finally obtain a homogeneous precursor mixture; add 0.4 g of cesium carbonate, 3 mL of glacial acetic acid and 1 mL of hydrochloric acid to another 20 mL reagent bottle, and obtain a colorless and clear CsCl solution by stirring; then pour all of the CsCl solution into the stirring (rotation speed 1000 r / min) precursor mixture, and stir at 40 °C for 8 hours; then transfer the obtained mixed solution to a 50 mL centrifuge tube, and centrifuge at 2000 rpm for 2 min, and remove the supernatant to obtain a precipitate. Finally, place the precipitate in a vacuum drying oven and dry at 100 °C for 12 hours to obtain a dry Cs 4 YCl7 : Sb powder, which is a cesium yttrium chloride-based lead-free perovskite intelligent response luminescent material.

[0058] Example 2

[0059] The difference from Example 1 is only that the addition amount of isopropanol is 7 mL; the remaining steps and parameters are the same as those in Example 1.

[0060] Example 3

[0061] The difference from Example 1 is only that the addition amount of isopropanol is 8 mL; the remaining steps and parameters are the same as those in Example 1.

[0062] Example 4

[0063] The difference from Example 1 is only that the addition amount of isopropanol is 9 mL; the remaining steps and parameters are the same as those in Example 1.

[0064] Example 5

[0065] The difference from Example 1 is only that the addition amount of isopropanol is 10 mL; the remaining steps and parameters are the same as those in Example 1.

[0066] Example 6

[0067] The difference from Example 3 is only that the addition amount of cesium carbonate is 0.1 g; the remaining steps and parameters are the same as those in Example 3.

[0068] Example 7

[0069] The difference from Example 3 is only that the addition amount of cesium carbonate is 0.2 g; the remaining steps and parameters are the same as those in Example 3.

[0070] Example 8

[0071] The difference from Example 3 is only that the addition amount of cesium carbonate is 0.3 g; the remaining steps and parameters are the same as those in Example 3.

[0072] Example 9

[0073] The difference from Example 3 is only that the addition amount of cesium carbonate is 0.5 g; the remaining steps and parameters are the same as those in Example 3.

[0074] Example 10

[0075] The difference from Example 3 is only that the addition amount of cesium carbonate is 0.6 g; the remaining steps and parameters are the same as those in Example 3.

[0076] Example 11

[0077] The difference from Example 3 is only that the stirring time at 40 °C is adjusted from 8 hours to 6 hours; the remaining steps and parameters are the same as those in Example 3.

[0078] Example 12

[0079] The difference from Example 3 is only that the stirring time at 40 °C is adjusted from 8 hours to 7 hours; the remaining steps and parameters are the same as those in Example 3.

[0080] Example 13

[0081] The difference from Example 3 is only that the stirring time at 40 °C is adjusted from 8 hours to 9 hours; the remaining steps and parameters are the same as those in Example 3.

[0082] The basic physical properties of the materials prepared in the above examples are shown in Table 1 below.

[0083] Table 1 Performance of cesium yttrium chloride lead-free perovskite intelligent response luminescent material

[0084] Number Peak position of photoluminescence spectrum (nm) Luminescence quantum efficiency (%) Example 1 563 53.58 Example 2 576 65.36 Example 3 588 76.84 Example 4 586 72.95 Example 5 590 69.42 Example 6 561 59.81 Example 7 574 65.25 Example 8 579 63.17 Example 9 589 67.43 Example 10 587 52.34 Example 11 578 68.25 Example 12 585 74.51 Example 13 592 65.28

[0085] The differences in the PLQY values in Table 1 may be due to the differences in the crystallization quality under different reaction conditions.

[0086] Figure 1 X-ray diffraction spectrum (XRD) of the cesium yttrium chloride lead-free perovskite intelligent response luminescent material (Cs 4 YCl 7 :Sb) synthesized in Example 3 of the present invention. It can be seen that the cesium yttrium chloride lead-free perovskite intelligent response luminescent material exhibits good crystallinity, and the XRD peaks correspond well to the Cs Figure 1 YbCl 4 standard spectrum. 7

[0087] Figure 2 Emission spectra (a) of the cesium yttrium chloride lead-free perovskite intelligent response luminescent material synthesized in Example 3 of the present invention under excitation by light of different wavelengths, and excitation spectra (b) obtained under monitoring by light of different wavelengths. It can be found that the emission spectra obtained under excitation by light of different wavelengths overlap, and the excitation spectra obtained under monitoring by light of different wavelengths also overlap, indicating that the luminescence of the cesium yttrium chloride lead-free perovskite intelligent response luminescent material originates from self-trapped exciton emission. Figure 2

[0088] Figure 3 Screenshot of the test result of the luminescence quantum yield of the cesium yttrium chloride lead-free perovskite intelligent response luminescent material synthesized in Example 3 of the present invention. It can be seen that its luminescence quantum yield is as high as 76.84%. Figure 3

[0089] Figure 4 Photographs related to the luminescence color transition process of the cesium yttrium chloride lead-free perovskite intelligent response luminescent material synthesized in Example 3 of the present invention during ethanol infiltration (the photographs were taken during the continuous dripping of ethanol onto the Cs 4 YCl 7 :Sb luminescent material, and the Cs 4 YCl 7 :Sb luminescent material was always under the irradiation of 254 nm ultraviolet light). It can be found that during the transition from Cs 4 YCl 7 :Sb to Cs 3 YCl 6 :Sb, the luminescence color changes from yellow to green.

[0090] Figure 5 Emission spectra of the cesium yttrium chloride lead-free perovskite intelligent response luminescent material synthesized in Example 3 of the present invention before and after ethanol infiltration (the yellow part in the figure represents before ethanol infiltration, and the green part represents after ethanol infiltration). After ethanol infiltration, the emission peak shifts from 588 nm to 538 nm.

[0091] The above-described embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A cesium yttrium chloride lead-free perovskite smart response luminescent material that can be triggered to change color by ethanol, characterized in that: The chemical formula is: Cs4YCl7:Sb; it belongs to the hexagonal system, the corresponding space group is R-3m, and its structure consists of isolated [InCl6] 3- Octahedral Cs2InCl6 layers and six-fold disordered Cl - The Cs2Cl layer is composed of; among the ions contained in Cs4YCl7:Sb, Y 3+ The ionic radius is Cs + The ionic radius is Sb 3+ The ionic radius is The Sb doping amount is 2.5%.

2. A method for preparing the cesium yttrium chloride lead-free perovskite intelligent response luminescent material capable of changing color by ethanol as claimed in claim 1, characterized in that: The following steps are involved: Dispersing Cs3YCl6:Sb in an organic solvent to obtain a precursor mixture; Mix cesium salt with glacial acetic acid and hydrochloric acid to obtain CsCl solution; The CsCl solution is added to the precursor mixture for reaction, followed by centrifugation and drying to obtain the cesium yttrium chloride lead-free perovskite smart response luminescent material that can be triggered to change color by ethanol.

3. The preparation method according to claim 1, characterized in that: The organic solvent is isopropanol; the mass volume ratio of the Cs3YCl6:Sb to the organic solvent is (0.8-2.2) g:(6-10) mL.

4. The preparation method according to claim 1, characterized in that: The mass volume ratio of the cesium salt to the glacial acetic acid and hydrochloric acid is (0.1-0.6) g:3 mL:1 mL.

5. The preparation method according to claim 1, characterized in that: The mass ratio of the Cs3YCl6:Sb to the cesium salt is 1.5:(0.1-0.6); the cesium salt is cesium carbonate.

6. The preparation method according to claim 1, characterized in that: The reaction temperature is 40° C. and the reaction time is 6-9 hours.

7. The preparation method according to claim 1, characterized in that: The preparation method of Cs3YCl6:Sb comprises the following steps: Mix yttrium carbonate, cesium carbonate, glacial acetic acid and hydrochloric acid to obtain a precursor solution; The precursor solution is added to an anti-solvent solution, followed by centrifugation, and the resulting precipitate is washed and dried to obtain the Cs3YCl6:Sb.

8. The preparation method according to claim 7, characterized in that: The anti-solvent solution is a mixture of antimony acetate and acetonitrile in a mass volume ratio of 0.015 g:20 mL; The mass volume ratio of the yttrium carbonate, cesium carbonate, glacial acetic acid and hydrochloric acid is 0.36g:1g:6mL:1.5mL; The mass ratio of the cesium carbonate to the antimony acetate is 1:0.

015.

9. An information encryption material, characterized in that: The raw materials include the cesium yttrium chloride lead-free perovskite intelligent response luminescent material that can be triggered to change color by ethanol as described in claim 1.

10. An anti-counterfeiting material, characterized in that: The raw materials include the cesium yttrium chloride lead-free perovskite intelligent response luminescent material that can be triggered to change color by ethanol as described in claim 1.

Images