High-efficiency infrared luminescent material, preparation method and application

Abstract

The application belongs to the technical field of infrared luminescent materials, and particularly relates to a high-efficiency infrared luminescent material, a preparation method and application. x S 1+3 / 2x :mM,nN; wherein, Ln is one of Tm, Nd, Ho, Er, Dy, Yb or a combination of two or more thereof; M is one of Li, Na, K, Rb, Cs, F or a combination of two or more thereof; N is one of Bi, Cr, Ce, Cu, Mn, Sn or a combination of two or more thereof; x=0.0001-0.5, m=0-0.5, n=0-0.02. Experiments prove that the external quantum efficiency of the high-efficiency infrared luminescent material is 54.9%-65.6%, the high-efficiency infrared luminescent material can exist stably for a long time, has excellent infrared luminescent performance, a narrow emission band and high quantum efficiency, and is obviously superior to similar infrared luminescent products.

Description

Technical Field

[0001] This invention belongs to the field of infrared luminescent materials technology, specifically relating to a high-efficiency infrared luminescent material, its preparation method, and its application. Background Technology

[0002] As living standards gradually improve, people have raised higher requirements for safety in fields such as food, security monitoring, and autonomous driving. Infrared light, used for detecting drug residues on fruit surfaces, security monitoring, artificial intelligence, biomedicine, and plant growth, has received high attention.

[0003] In recent years, there have been many reports on infrared luminescent materials both domestically and internationally, but most of them focus on Cr. 3+ Mn 2+ While transition metal ions emit broad wavelengths, there are few reports on high-efficiency narrowband infrared phosphors, and their infrared luminescence intensity is low, thus limiting their application in LEDs. Therefore, it is necessary to develop infrared phosphors that can maintain long-term stability, exhibit excellent luminescence performance, and possess good quantum efficiency to enable their practical application in manufacturing.

[0004] Therefore, based on this, the technical solution of the present invention is proposed. Summary of the Invention

[0005] To address the problems existing in the prior art, the present invention provides a high-efficiency infrared luminescent material, the chemical formula of which is shown in Formula I:

[0006] SrLn x S 1+（3 / 2）x :mM,nN formula I;

[0007] Wherein, Ln is one or more combinations of Tm, Nd, Ho, Er, Dy, and Yb;

[0008] M is one or more of Li, Na, K, Rb, Cs, and F;

[0009] N is one or more of Bi, Cr, Ce, Cu, Mn, and Sn;

[0010] x=0.0001~0.5, m=0~0.5, n=0~0.02.

[0011] Preferably, x = 0.001~0.2, m = 0~0.4, and n = 0.01.

[0012] Based on the same technical concept, another aspect of the present invention is to provide a method for preparing a high-efficiency infrared luminescent material, the preparation method comprising the following steps:

[0013] (1) Mixing Sr-containing compounds, sulfur source, Ln-containing compounds, N-containing compounds and M-containing compounds to obtain a first mixture;

[0014] (2) Wrap the second mixture around the first mixture, then sinter it, and then remove the wrapping layer to obtain the high-efficiency infrared luminescent material;

[0015] The second mixture includes one or more of a sulfur source, a carbon material, and an M-containing compound.

[0016] More specifically, in this invention, a first mixture and a second mixture are placed in a crucible for sintering. A portion of the second mixture is spread evenly at the bottom of the crucible, then the first mixture is placed on top of the second mixture, and finally the remaining second mixture is placed over the first mixture, thus encapsulating the first mixture and forming a "sandwich" structure of second mixture-first mixture-second mixture. In this invention, the second mixture serves as the encapsulating material, forming an encapsulation layer during sintering. This encapsulation layer, during sintering, increases the saturated vapor pressure of the first mixture, accelerates ion diffusion, and prevents the first mixture from melting or sublimating.

[0017] Preferably, the Sr-containing compound is one or a combination of two or more of the following: Sr-containing carbonates, Sr-containing sulfates, Sr-containing oxalates, Sr-containing acetates, and Sr-containing hydroxides.

[0018] And / or, the sulfur source is one or a combination of two or more of sulfur powder, ammonium thiocyanate, and thiourea;

[0019] And / or, the Ln-containing compound is one or a combination of two or more of Ln-containing carbonates, Ln-containing oxides, and Ln-containing sulfates;

[0020] And / or, the N-containing compound is one or a combination of two or more of the following: N-containing carbonates, N-containing oxides, N-containing sulfates, and N-containing acetates;

[0021] And / or, the carbon material is one or a combination of two or more of activated carbon, graphite, hard carbon, and carbon fiber.

[0022] Preferably, when M is one or a combination of two or more of Li, Na, K, Rb, and Cs,

[0023] The M-containing compound is one or a combination of two or more of the following: M-containing oxides, M-containing carbonates, M-containing oxalates, M-containing nitrates, M-containing sulfates, and M-containing acetates.

[0024] And / or, when M is F, the compound containing M is one or more of the following: metal fluorides containing F, hydrofluoric acid, ammonium fluoride, boron trifluoride, and sodium fluorosilicate.

[0025] Preferably, in step (1), the molar ratio of the Sr-containing compound, the sulfur source, the M-containing compound, the Ln-containing compound, and the N-containing compound is 0.90~2:2~4:0~0.4:0.0001~0.02.

[0026] Preferably, in the second mixture, the molar ratio of sulfur source, carbon material and M-containing compound is 2~3:0.5~1:0.0001~1.

[0027] Preferably, the weight ratio of the second mixture to the first mixture is 0.2 to 5:1.

[0028] Preferably, the sintering temperature is 700~1400℃, the sintering time is 1~12h, and the sintering atmosphere is an air atmosphere.

[0029] Based on the same technical concept, this invention also provides an application of a high-efficiency infrared luminescent material in the fields of bioimaging and lasers. The high-efficiency luminescent material can be excited by blue light to emit light sources of different wavelengths, and can be used in bioimaging and laser fields.

[0030] The beneficial effects of this invention are as follows:

[0031] The high-efficiency infrared luminescent material described in this invention can exist stably for a long time, exhibits excellent luminescence performance and good quantum efficiency. Experiments have confirmed that the external quantum efficiency of the high-efficiency infrared luminescent material is 54.9%~65.6%, and it can exist stably for a long time. Its infrared luminescence performance is excellent, with a narrow emission band and high quantum efficiency, which is significantly better than similar infrared luminescent products. In addition, when thulium ions are present, the maximum emission peak position of the material is around 794nm; when neodymium ions are present, the maximum emission peak position of the material is around 1070nm; when holmium ions are present, the maximum emission peak position of the material is around 1065nm; and when erbium ions are present, the maximum emission peak position of the material is around 1550nm, demonstrating excellent overall performance. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1The high-efficiency infrared luminescent material SrTm in Example 1 0.03 S 1.045 XRD pattern of 0.01Na.

[0034] Figure 2 The high-efficiency infrared luminescent material SrTm in Example 1 0.03 S 1.045 PLQY data plot for 0.01Na.

[0035] Figure 3 The high-efficiency infrared luminescent material SrYb in Example 2 0.06 S 1.09 Scanning electron microscope images at 0.01K and 0.01Bi.

[0036] Figure 4 The high-efficiency infrared luminescent material SrTm in Example 3 0.03 S 1.045 Emission spectra of 0.01F and 0.01Cr.

[0037] Figure 5 The high-efficiency infrared luminescent material SrNd in Example 4 0.03 S 1.045 Emission spectra of 0.01Cs and 0.01Bi.

[0038] Figure 6 The high-efficiency infrared luminescent material SrEr in Example 6 0.01 S 1.015 Emission spectrum of 0.05Li.

[0039] Figure 7 The high-efficiency infrared luminescent material SrHo in Example 8 0.03 S 1.045 Emission spectrum of 0.05Rb. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0041] Example 1

[0042] This embodiment provides a method for preparing a high-efficiency infrared luminescent material, including the following steps:

[0043] (1) According to the chemical formula SrTm 0.03 S 1.045The molar ratio of each element in 0.01Na is determined by accurately weighing strontium carbonate, thulium oxide, sulfur powder, and sodium carbonate, and mixing them evenly to obtain the first mixture.

[0044] (2) A mixture of carbon particles, carbon felt and sulfur powder is used as a coating layer, i.e., a second mixture; wherein the weight ratio of sulfur powder to carbon particles is 1:0.5;

[0045] (3) Wrap the second mixture around the first mixture, sinter it at 1100°C for 2 hours in an air atmosphere, cool it to room temperature and take it out, then remove the wrapping layer, grind the product to obtain a high-efficiency infrared luminescent material; wherein the weight ratio of the first mixture to the second mixture is 1:0.8.

[0046] Example 2

[0047] This embodiment provides a method for preparing a high-efficiency infrared luminescent material, including the following steps:

[0048] (1) According to the chemical formula SrYb 0.06 S 1.09 The molar ratio of each element in 0.01K and 0.01Bi is determined. Strontium carbonate, ytterbium oxide, potassium carbonate, bismuth oxide, and sulfur powder are accurately weighed and mixed evenly to obtain the first mixture.

[0049] (2) A mixture of carbon particles, carbon felt, sodium carbonate and ammonium thiocyanate is used as a coating layer, i.e., the second mixture; wherein the weight ratio of the sulfur-containing mixture to the carbon particles is 1:0.5;

[0050] (3) Wrap the second mixture around the first mixture, sinter it at 1100°C for 2 hours in an air atmosphere, cool it to room temperature and take it out, then remove the wrapping layer, grind the product to obtain a high-efficiency infrared luminescent material; wherein the weight ratio of the first mixture to the second mixture is 1:1.2.

[0051] Example 3

[0052] This embodiment provides a method for preparing a high-efficiency infrared luminescent material, including the following steps:

[0053] (1) According to the chemical formula SrTm 0.03 S 1.045 The molar ratio of each element in 0.01F and 0.01Cr is determined. Strontium carbonate, thulium oxide, ammonium fluoride, chromium oxide and sulfur powder are accurately weighed and mixed evenly to obtain the first mixture.

[0054] (2) A mixture of carbon particles, carbon felt and thiourea is used as a coating layer, i.e., the second mixture; wherein the weight ratio of the sulfur-containing mixture to the carbon particles is 1:0.5;

[0055] (3) Wrap the second mixture around the first mixture, sinter it in air at 1150°C for 2 hours, cool it to room temperature and remove it, then remove the wrapping layer and grind the product to obtain a high-efficiency infrared luminescent material; wherein the weight ratio of the first mixture to the second mixture is 1:0.5.

[0056] Example 4

[0057] This embodiment provides a method for preparing a high-efficiency infrared luminescent material, including the following steps:

[0058] (1) According to the chemical formula SrNd 0.03 S 1.045 The molar ratio of each element in 0.01Cs and 0.01Bi was determined. Strontium carbonate, neodymium oxide, cesium sulfate, bismuth oxide, and ammonium thiocyanate were accurately weighed and mixed evenly to obtain the first mixture.

[0059] (2) A mixture of carbon particles, carbon felt and sulfur powder is used as a coating layer, i.e., a second mixture; wherein the weight ratio of the sulfur-containing mixture to the carbon particles is 1:0.5;

[0060] (3) Wrap the second mixture around the first mixture, sinter it in air at 1050°C for 2 hours, cool it to room temperature and remove it, then remove the wrapping layer and grind the product to obtain a high-efficiency infrared luminescent material; wherein the weight ratio of the first mixture to the second mixture is 1:0.5.

[0061] Example 5

[0062] This embodiment provides a method for preparing a high-efficiency infrared luminescent material, including the following steps:

[0063] (1) According to the chemical formula SrNd 0.03 S 1.045 The molar ratio of each element in 0.01Na and 0.01Cr is determined. Strontium carbonate, neodymium oxide, sodium oxalate, chromium oxide, and thiourea are accurately weighed and mixed evenly to obtain the first mixture.

[0064] (2) A mixture of carbon particles, carbon felt and sulfur powder is used as a coating layer, i.e., a second mixture; wherein the weight ratio of the sulfur-containing mixture to the carbon particles is 1:0.5;

[0065] (3) Wrap the second mixture around the first mixture, sinter it in air at 1050°C for 2 hours, cool it to room temperature and remove it, then remove the wrapping layer and grind the product to obtain a high-efficiency infrared luminescent material; wherein the weight ratio of the first mixture to the second mixture is 1:1.

[0066] Example 6

[0067] This embodiment provides a method for preparing a high-efficiency infrared luminescent material, including the following steps:

[0068] (1) According to the chemical formula SrEr 0.01 S 1.015 The molar ratio of each element in 0.05Li was determined by accurately weighing strontium carbonate, lithium oxide, erbium oxide, and sulfur powder, and mixing them uniformly to obtain the first mixture.

[0069] (2) A mixture of carbon particles, carbon felt and sulfur powder is used as a coating layer, i.e., a second mixture; wherein the weight ratio of the sulfur-containing mixture to the carbon particles is 1:0.5;

[0070] (3) Wrap the second mixture around the first mixture, sinter it in air at 1100°C for 2 hours, cool it to room temperature and remove it, then remove the wrapping layer and grind the product to obtain a high-efficiency infrared luminescent material; wherein the weight ratio of the first mixture to the second mixture is 1:0.5.

[0071] Example 7

[0072] This embodiment provides a method for preparing a high-efficiency infrared luminescent material, including the following steps:

[0073] (1) According to the chemical formula SrEr 0.01 S 1.015 The molar ratio of each element in 0.05Na and 0.01Cr is determined. Strontium carbonate, erbium oxide, sodium sulfate, chromium oxide, and sulfur powder are accurately weighed and mixed evenly to obtain the first mixture.

[0074] (2) A mixture of carbon particles, carbon felt and thiourea is used as a coating layer, i.e., the second mixture; wherein the weight ratio of the sulfur-containing mixture to the carbon particles is 1:0.5;

[0075] (3) Wrap the second mixture around the first mixture, sinter it at 1100°C for 2 hours in an air atmosphere, cool it to room temperature and take it out, then remove the wrapping layer, grind the product to obtain a high-efficiency infrared luminescent material; wherein the weight ratio of the first mixture to the second mixture is 1:0.7.

[0076] Example 8

[0077] This embodiment provides a method for preparing a high-efficiency infrared luminescent material, including the following steps:

[0078] (1) According to the chemical formula SrHo 0.03 S 1.045 The molar ratio of each element in 0.05Rb is determined by accurately weighing strontium carbonate, holmium oxide, rubidium carbonate, and sulfur powder, and mixing them uniformly to obtain the first mixture.

[0079] (2) A mixture of carbon particles, carbon felt and sulfur powder is used as a coating layer, i.e., a second mixture; wherein the weight ratio of the sulfur-containing mixture to the carbon particles is 1:0.5;

[0080] (3) Wrap the second mixture around the first mixture, sinter it in air at 1000°C for 2.5 h, cool it to room temperature and take it out, then remove the wrapping layer, grind the product to obtain a high-efficiency infrared luminescent material; wherein the weight ratio of the first mixture to the second mixture is 1:1.

[0081] Example 9

[0082] This embodiment provides a method for preparing a high-efficiency infrared luminescent material, including the following steps:

[0083] (1) According to the chemical formula SrHo 0.03 S 1.045 The molar ratio of each element in 0.05Na and 0.5Bi is determined. Strontium carbonate, holmium oxide, bismuth oxide, sodium carbonate, and sulfur powder are accurately weighed and mixed evenly to obtain the first mixture.

[0084] (2) A mixture of carbon particles, carbon felt and thiourea is used as a coating layer, i.e., the second mixture; wherein the weight ratio of the sulfur-containing mixture to the carbon particles is 1:0.5;

[0085] (3) Wrap the second mixture around the first mixture, sinter it in air at 1000°C for 2.5 h, cool it to room temperature and take it out, then remove the wrapping layer, grind the product to obtain a high-efficiency infrared luminescent material; wherein the weight ratio of the first mixture to the second mixture is 1:1.

[0086] Verification Example

[0087] 1. The phase structure of the high-efficiency infrared luminescent material obtained in Example 1 was tested using an Empyrean X-ray powder diffractometer. The test results are as follows: Figure 1 As shown. Figure 1 This is an X-ray diffraction pattern of a highly efficient infrared luminescent material.

[0088] The high-efficiency infrared luminescent material obtained in Example 1 was subjected to PLQY testing using a Hamamatsu instrument. The test results are as follows: Figure 2 As shown. From Figure 2 It can be seen that the external quantum efficiency of the high-efficiency infrared luminescent material prepared in Example 1 of the present invention is 60.7%.

[0089] 2. The high-efficiency infrared luminescent material obtained in Example 2 was analyzed by electron microscopy, and the results are as follows: Figure 3 As shown, Figure 3The image shows the SEM scan of the high-efficiency infrared luminescent material prepared in Example 2. The external quantum efficiency of the high-efficiency infrared luminescent material prepared in Example 2 is 62.2%.

[0090] 3. The high-efficiency infrared luminescent material obtained in Example 3 was subjected to fluorescence spectroscopy testing using an Edinburgh FLS980 microscope. Figure 4 As shown. When blue light is used for excitation, the wavelength of the maximum emission intensity of the luminescent material is located near 794 nm. The external quantum efficiency of the high-efficiency infrared luminescent material prepared in Example 3 is 64.3%.

[0091] 4. The high-efficiency infrared luminescent material obtained in Example 4 was subjected to fluorescence spectroscopy testing using an Edinburgh FLS980 microscope. Figure 5 As shown. When blue light is used for excitation, the wavelength of the maximum emission intensity of the luminescent material is located near 1070 nm. The external quantum efficiency of the high-efficiency infrared luminescent material prepared in Example 4 is 58.5%.

[0092] 5. The phase structure of the high-efficiency infrared luminescent material obtained in Example 5 was tested using an Empyrean X-ray powder diffractometer. Its X-ray diffraction pattern is consistent with... Figure 1 Approximately. The external quantum efficiency of the luminescent material prepared in Example 5 is 55.4%.

[0093] 6. The high-efficiency infrared luminescent material obtained in Example 6 was subjected to fluorescence spectroscopy testing using an Edinburgh FLS980 microscope. Figure 6 As shown, the wavelength of maximum emission intensity is located around 1550 nm. The external quantum efficiency of the luminescent material prepared in Example 6 is 56.6%.

[0094] 7. The phase structure of the high-efficiency infrared luminescent material obtained in Example 7 was tested using an Empyrean X-ray powder diffractometer. Its X-ray diffraction pattern is consistent with... Figure 1 Approximately. The external quantum efficiency of the luminescent material prepared in Example 7 is 54.9%.

[0095] 8. The phase structure of the high-efficiency infrared luminescent material obtained in Example 8 was tested using an Empyrean X-ray powder diffractometer. Its X-ray diffraction pattern is consistent with... Figure 1 approximate.

[0096] The high-efficiency infrared luminescent material obtained in Example 8 was subjected to fluorescence spectroscopy testing using an Edinburgh FLS980 microscope. Figure 7 As shown, the wavelength of maximum emission intensity is located near 1065 nm. The external quantum efficiency of the luminescent material prepared in Example 8 is 65.6%.

[0097] 9. The phase structure of the high-efficiency infrared luminescent material obtained in Example 9 was tested using an Empyrean X-ray powder diffractometer. Its X-ray diffraction pattern is consistent with... Figure 1 Approximately. The external quantum efficiency of the luminescent material prepared in Example 9 of this invention is 63.1%.

[0098] In summary, the infrared luminescent material provided by this invention exhibits high luminescence intensity and quantum efficiency, with an external quantum efficiency of 54.9%~65.6%. It can remain stable over a long period, demonstrating excellent infrared luminescence performance, a narrow emission band, and high quantum efficiency, significantly superior to similar infrared luminescent products. Furthermore, when excited by blue light, the wavelength of maximum emission intensity varies depending on the ion. When thulium ions are present, the maximum emission peak is around 794 nm; when neodymium ions are present, the maximum emission peak is around 1070 nm; when holmium ions are present, the maximum emission peak is around 1065 nm; and when erbium ions are present, the maximum emission peak is around 1550 nm.

[0099] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for preparing a high-efficiency infrared luminescent material, characterized in that, The preparation method comprises the following steps: (1) mixing a Sr-containing compound, a sulfur source, an Ln-containing compound, an N-containing compound and an M-containing compound to obtain a first mixture; (2) wrapping a second mixture outside the first mixture, then sintering, and then removing the wrapping layer to obtain the high-efficiency infrared luminescent material; The second mixture is composed of carbon particles, carbon felt and sulfur powder; The chemical formula of the high-efficiency infrared luminescent material is shown in formula I: SrLn x S 1+3 / 2x : mM, nN formula I; Ln is Tm, M is Na, and N is Bi; 0.0001≤x≤0.5, 0 2. The high-efficiency infrared luminescent material obtained by the preparation method in claim 1.

3. A method for preparing a high-efficiency infrared luminescent material, characterized in that, The preparation method comprises the following steps: (1) mixing a Sr-containing compound, a sulfur source, an Ln-containing compound, an N-containing compound and an M-containing compound to obtain a first mixture; (2) wrapping a second mixture outside the first mixture, then sintering, and then removing the wrapping layer to obtain the high-efficiency infrared luminescent material; The second mixture is composed of carbon particles, carbon felt, sodium carbonate and ammonium thiocyanate; The chemical formula of the high-efficiency infrared luminescent material is shown in formula I: SrLn x S 1+3 / 2x : mM, nN formula I; Ln is Yb, M is K, and N is Bi; 0.0001≤x≤0.5, 0 4. The high-efficiency infrared luminescent material obtained by the preparation method in claim 3.

5. A method for preparing a high-efficiency infrared luminescent material, characterized in that, The preparation method comprises the following steps: (1) mixing a Sr-containing compound, a sulfur source, an Ln-containing compound, an N-containing compound and an M-containing compound to obtain a first mixture; (2) wrapping a second mixture outside the first mixture, then sintering, and then removing the wrapping layer to obtain the high-efficiency infrared luminescent material; The second mixture is composed of carbon particles, carbon felt and thiourea; The chemical formula of the high-efficiency infrared luminescent material is shown in formula I: SrLn x S 1+3 / 2x : mM, nN formula I; Ln is Tm, M is F, and N is Cr; 0.0001≤x≤0.5, 0 6. The high-efficiency infrared luminescent material obtained by the preparation method in claim 5.

7. A method for preparing a high-efficiency infrared luminescent material, characterized in that, The preparation method comprises the following steps: (1) mixing a Sr-containing compound, a sulfur source, an Ln-containing compound, an N-containing compound and an M-containing compound to obtain a first mixture; (2) wrapping a second mixture outside the first mixture, then sintering, and then removing the wrapping layer to obtain the high-efficiency infrared luminescent material; The second mixture is composed of carbon particles, carbon felt and sulfur powder; The chemical formula of the high-efficiency infrared luminescent material is shown in formula I: SrLn x S 1+3 / 2x : mM, nN formula I; Ln is Nd, M is Cs, and N is Bi; 0.0001≤x≤0.5, 0 8. The high-efficiency infrared luminescent material obtained by the preparation method in claim 7.

9. A method for preparing a high-efficiency infrared luminescent material, characterized in that, The preparation method comprises the following steps: (1) mixing a Sr-containing compound, a sulfur source, an Ln-containing compound, an N-containing compound and an M-containing compound to obtain a first mixture; (2) wrapping a second mixture outside the first mixture, then sintering, and then removing the wrapping layer to obtain the high-efficiency infrared luminescent material; The second mixture is composed of carbon particles, carbon felt and sulfur powder; The chemical formula of the high-efficiency infrared luminescent material is shown in formula I: SrLn x S 1+3 / 2x : mM, nN formula I; wherein, Ln is Nd, M is Na, N is Cr; 0.0001≤x≤0.5, 0 10. The high-efficiency infrared luminescent material prepared by the method of claim 9.

11. A method for preparing a high-efficiency infrared luminescent material, characterized in that, comprising the following steps: (1) mixing a Sr-containing compound, a sulfur source, an Ln-containing compound, an N-containing compound and an M-containing compound to obtain a first mixture; (2) wrapping a second mixture outside the first mixture, then sintering, and then removing the wrapping layer to obtain the high-efficiency infrared luminescent material; wherein the second mixture is composed of carbon particles, carbon felt and sulfur powder; the high-efficiency infrared luminescent material has a chemical formula as shown in formula I: SrLn x S 1+3 / 2x : mM, nN formula I; wherein, Ln is Er, M is Li; 0.0001≤x≤0.5, 0 12. The high-efficiency infrared luminescent material prepared by the method of claim 11.

13. A method for preparing a high-efficiency infrared luminescent material, characterized in that, comprising the following steps: (1) mixing a Sr-containing compound, a sulfur source, an Ln-containing compound, an N-containing compound and an M-containing compound to obtain a first mixture; (2) wrapping a second mixture outside the first mixture, then sintering, and then removing the wrapping layer to obtain the high-efficiency infrared luminescent material; wherein the second mixture is composed of carbon particles, carbon felt and sulfur powder; the high-efficiency infrared luminescent material has a chemical formula as shown in formula I: SrLn x S 1+3 / 2x : mM, nN formula I; wherein, Ln is Er, M is Na, N is Cr; 0.0001≤x≤0.5, 0 14. The high-efficiency infrared luminescent material prepared by the method of claim 13.

15. A method for preparing a high-efficiency infrared luminescent material, characterized in that, comprising the following steps: (1) mixing a Sr-containing compound, a sulfur source, an Ln-containing compound, an N-containing compound and an M-containing compound to obtain a first mixture; (2) wrapping a second mixture outside the first mixture, then sintering, and then removing the wrapping layer to obtain the high-efficiency infrared luminescent material; wherein the second mixture is composed of carbon particles, carbon felt and sulfur powder; the high-efficiency infrared luminescent material has a chemical formula as shown in formula I: SrLn x S 1+3 / 2x : mM, nN formula I; wherein, Ln is Ho, M is Rb; 0.0001≤x≤0.5, 0 16. The high-efficiency infrared luminescent material prepared by the method of claim 15.

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