Near-infrared antimonate fluorescent material and preparation method thereof

Abstract

The invention provides a near-infrared antimonate fluorescent material and a preparation method thereof, and belongs to the technical field of fluorescent materials. The general chemical formula of the near-infrared antimonate fluorescent material is BaAl4-4xFe4xSb2O12-yFy, x is greater than or equal to 0.25% and less than or equal to 2%, and y is greater than or equal to 0% and less than or equal to 20%. According to the invention, BaAl4Sb2O12 is adopted as a matrix, Fe < 3 + > is introduced as an activator ion, and F <-> is utilized to replace O < 2-> for anion regulation, so that the luminous intensity and quantum efficiency of the prepared near-infrared antimonate fluorescent material can be effectively improved. The preparation method of the near-infrared antimonate fluorescent material provided by the invention is simple and easy to implement, the required raw material resources are abundant in reserves, and the prepared near-infrared antimonate fluorescent material can emit near-infrared light with the central wavelength of 782nm, is high in luminous intensity, good in physical and chemical stability, ideal in fluorescence lifetime, green and pollution-free, has excellent thermal stability, and is suitable for industrial production. Good application prospects are realized.

Description

Technical Field

[0001] This invention relates to the field of fluorescent materials technology, specifically to a near-infrared antimonate fluorescent material and its preparation method. Background Technology

[0002] Near-infrared (NIR) luminescent materials have attracted considerable attention due to the various emerging applications of near-infrared spectroscopy. Near-infrared spectroscopy is a highly efficient and non-destructive analytical technique. To meet the application requirements of real-time monitoring, rapid analysis, and portability, the development of small and lightweight near-infrared light sources has become a current research hotspot. However, traditional NIR light sources such as halogen tungsten lamps and infrared lasers suffer from problems such as large size, low luminous efficiency, short lifetime, and narrow half-width at half-maximum (FWHM), which can no longer meet diverse application needs. Near-infrared phosphor-converted light-emitting diodes (NIR LEDs), which combine compact light-emitting diode chips with high-performance near-infrared phosphors, offer advantages such as small size, long lifetime, tunable spectrum, and low cost, and have become a new generation of near-infrared light sources for tissue penetration, non-destructive testing, information encryption, and temperature measurement. Furthermore, near-infrared light exhibits weak light-matter interactions, allowing it to penetrate deep into biological tissues; in particular, ratio thermometers based on near-infrared fluorescence intensity ratio (FIR) offer advantages such as high accuracy, fast response, and non-contact operation. For all near-infrared spectroscopy applications, phosphors with high quantum efficiency and stability offer better performance in terms of signal strength and energy saving, which means that finding suitable near-infrared luminescent materials is urgently needed.

[0003] The activator ions doped in near-infrared phosphors can be broadly classified into trivalent lanthanide ions and transition metal ions. Trivalent rare earth ions (Er...) 3+ ,Pr 3+ Yb 3+ Tm 3+ Nd 3+ Due to the forbidden 4f-4f spin transition, it exhibits narrow-band near-infrared emission characteristics and low luminescence efficiency. Conversely, transition metal ions such as Mn 2+ Fe 3+ Cr 3+ Cr 4+ and Ni 2+ Broadband NIR emission is achieved due to 3d-3d spin-allowed transitions. Among various transition metal ions, Fe... 3+ The half-filled electron configuration (d5), Fe 3+ It can happen 4 T1(4G)→ 6 A l (6S) transition emits near-infrared light. Simultaneously, Fe... 3+ Fe is an abundant ion resource, environmentally friendly, and biocompatible. Therefore, Fe 3+It could be an important near-infrared activator. However, due to Fe... 3+ The dd transition is prohibited, resulting in lower luminescence intensity, which limits its commercial applications. This is due to the fact that Fe... 3+ Problems that urgently need to be solved in phosphors. Summary of the Invention

[0004] In view of the technical problems existing in the background art, the present invention provides a near-infrared antimonate fluorescent material and its preparation method, by doping Fe into antimonate. 3+ Activate and utilize F - Replace O 2- Anion modulation can be used to effectively improve the luminescence intensity and quantum efficiency of the prepared near-infrared antimonate fluorescent material.

[0005] In a first aspect, embodiments of the present invention provide a near-infrared antimonate fluorescent material, wherein the chemical formula of the near-infrared antimonate fluorescent material is BaAl. 4-4x Fe 4x Sb2O 12-y F y Among them, 0.25%≤x≤2%, 0%≤y≤20%.

[0006] In some embodiments, 1%≤y≤20%, preferably 5%≤y≤20%.

[0007] In some embodiments, x = 0.5%.

[0008] Secondly, embodiments of the present invention provide a method for preparing near-infrared antimonate fluorescent materials, comprising the following steps: According to the general chemical formula BaAl 4-4x Fe 4x Sb2O 12-y F y The molar ratio of each element in the raw materials is determined by weighing; the raw materials include Ba source, Al source, Fe source, Sb source and F source; After weighing and mixing the raw materials and grinding them thoroughly, the materials are calcined and cooled to obtain near-infrared antimonate fluorescent materials.

[0009] In some embodiments, the Ba source includes at least one of BaO and BaCO3, preferably BaCO3.

[0010] In some embodiments, the Al source includes at least one of Al2O3 and Al(OH)3, preferably Al2O3.

[0011] In some embodiments, the Fe source includes at least one of Fe2O3, Fe(OH)3, and Fe2(SO4)3, preferably Fe2O3.

[0012] In some embodiments, the Sb source includes at least one of Sb2O3 and SbCl3, preferably Sb2O3.

[0013] In some embodiments, the F source includes at least one of BaF2 and NH4F, preferably BaF2.

[0014] In some embodiments, the calcination temperature of the calcination treatment is 1400~1500℃, and the calcination time is 2~4h.

[0015] The beneficial effects of this invention are: 1. The near-infrared antimonate fluorescent material provided by this invention uses BaAl4Sb2O 12 As the matrix, and Fe was introduced. 3+ As an activator ion, Al 3+ Fe 3+ Instead, near-infrared antimonate fluorescent materials prepared by high-temperature solid-state method have an emission peak range covering 600-1100 nm and can be effectively excited by ultraviolet light; based on this, the present invention further utilizes F - Replace O 2- Anion regulation induces lattice distortion, resulting in Fe 3+ It provides a highly distorted coordination environment, which helps it overcome the limitations of the Laporte selection rule and effectively improve its luminescence efficiency, thereby significantly enhancing the luminescence intensity and quantum efficiency of the prepared near-infrared antimonate phosphor.

[0016] 2. The preparation method of near-infrared antimonate fluorescent material provided by the present invention is simple and easy to implement, the required raw material resources are abundant and inexpensive, the obtained near-infrared antimonate fluorescent material has good physicochemical stability, ideal fluorescence lifetime, is green and pollution-free, and has excellent thermal stability. It can be widely used in night vision, non-destructive testing, plant growth and other fields, and has strong applicability and high commercial prospects.

[0017] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0018] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the present invention will be briefly described below. Obviously, the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0019] Figure 1 The XRD patterns of the near-infrared antimonate fluorescent materials prepared in Examples 1-5 are shown below. Figure 2 The XRD patterns of the near-infrared antimonate fluorescent materials prepared in Examples 2 and 6-12 are shown below. Figure 3 The normalized excitation emission spectrum of the near-infrared antimonate fluorescent material prepared in Example 2 is shown below. Figure 4 The emission spectra of the near-infrared antimonate fluorescent materials prepared in Examples 1-5 are shown at 782 nm. Figure 5 The emission spectra of the near-infrared antimonate fluorescent materials prepared in Examples 1-5 under 355 nm excitation are shown. Figure 6 The emission spectra of the near-infrared antimonate fluorescent materials prepared in Examples 2 and 6-12 are shown at 782 nm. Figure 7 The emission spectra of the near-infrared antimonate fluorescent materials prepared in Examples 2 and 6-12 under 355 nm excitation are shown. Figure 8 The quantum efficiency diagram of the near-infrared antimonate fluorescent material prepared in Example 2; Figure 9 The quantum efficiency diagram of the near-infrared antimonate fluorescent material prepared in Example 12; Figure 10 The temperature-dependent emission spectrum of the near-infrared antimonate fluorescent material prepared in Example 2; Figure 11 The temperature-dependent emission spectrum of the near-infrared antimonate fluorescent material prepared in Example 12. Detailed Implementation

[0020] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the invention, are intended to cover non-exclusive inclusion.

[0022] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0023] In the description of the embodiments of this invention, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0024] To solve the existing Fe 3+ To address the technical problem of low luminescence intensity in excited fluorescent materials, this invention provides a near-infrared antimonate fluorescent material and its preparation method, which involves doping Fe into antimonate. 3+ Activate and utilize F - Replace O 2- Anion modulation can be used to effectively improve the luminescence intensity and quantum efficiency of the prepared near-infrared antimonate fluorescent material.

[0025] In a first aspect, embodiments of the present invention provide a near-infrared antimonate fluorescent material, the chemical formula of which is BaAl. 4-4x Fe 4x Sb2O 12-y F y Among them, 0.25%≤x≤2%, 0%≤y≤20%.

[0026] In the technical solution of this invention embodiment, BaAl4Sb2O is used. 12 As the matrix, and Fe was introduced. 3+ As activator ions, some Al 3+ Fe 3+ The resulting near-infrared antimonate fluorescent material, under ultraviolet light excitation, exhibits an emission peak at 782 nm, with the excitation band extending from 200 nm to 500 nm, reaching maximum excitation at 355 nm, and can be effectively excited by ultraviolet light. Furthermore, this near-infrared antimonate fluorescent material possesses excellent thermal stability, meeting the requirements of practical applications.

[0027] In the above Fe 3+ Based on the excitation, the present invention further utilizes F - Replace O 2- Anion regulation can utilize fluoride ions to induce lattice distortion, thus enabling Fe...3+ This provides a highly distorted coordination environment, which helps it overcome the limitations of the Laporte selection rule, thereby effectively improving its luminescence efficiency. This is similar to the near-infrared antimonate fluorescent material (chemical formula BaAl) prepared without the introduction of F. 4-4x Fe 4x Sb2O 12 Compared to this, the general chemical formula is BaAl. 4-4x Fe 4x Sb2O 12-y F y The luminescence intensity and quantum efficiency of near-infrared antimonate fluorescent materials are significantly improved.

[0028] Furthermore, in some embodiments, 1%≤y≤20%, preferably 5%≤y≤20%.

[0029] In the technical solution of this invention, by optimizing the range of values ​​for y, it is beneficial to improve the luminescence intensity and quantum efficiency of near-infrared antimonate fluorescent materials. Compared with y=0, when y=20%, the luminescence intensity of the prepared near-infrared antimonate fluorescent material under 355nm excitation can be significantly increased to 3.49 times the original value, and the quantum efficiency is increased from 13.32% to 27.85%, achieving an effective improvement in the luminescence intensity and quantum efficiency of near-infrared antimonate fluorescent materials, and effectively solving the problem of Fe in the prior art. 3+ The problem is the low luminescence intensity of the excitation fluorescent material. If the value of y is further increased to more than 20%, the luminescence intensity gradually weakens compared to when y=20% as the value of y increases, and impurity peaks are present in the sample when the value of y exceeds 50%.

[0030] Furthermore, in some embodiments, x = 0.5%.

[0031] In the technical solution of this invention embodiment, due to Fe 3+ Ions gradually replace Al 3+ The process of ionization involves concentration quenching; excessively low or high Fe concentrations can lead to this phenomenon. 3+ Concentrations are not favorable for BaAl4Sb2O 12 The matrix is ​​effectively excited. By optimizing the value of x, this invention can obtain near-infrared antimonate fluorescent materials with the best near-infrared emission effect, thereby improving their luminescence intensity.

[0032] Secondly, embodiments of the present invention provide a method for preparing near-infrared antimonate fluorescent materials, comprising the following steps: According to the general chemical formula BaAl 4-4x Fe 4x Sb2O 12-y F yThe molar ratio of each element in the raw materials is determined by weighing; the raw materials include Ba source, Al source, Fe source, Sb source and F source; After weighing and mixing the raw materials and grinding them thoroughly, the materials are calcined and cooled to obtain near-infrared antimonate fluorescent materials.

[0033] In the technical solution of this invention embodiment, the preparation method of near-infrared antimonate fluorescent material is simple and easy to implement. The near-infrared antimonate fluorescent material is synthesized by high temperature solid-state method. The resulting product powder has excellent grain growth quality, few surface defects, and is loose and easy to crush. It is easy to scale up the production scale for mass production without affecting its luminescence performance.

[0034] Meanwhile, among the aforementioned raw materials, the Ba source can be Ba oxide and / or Ba salt; the Al source can be Al oxide and / or Al salt; the Fe source can be Fe oxide and / or Fe salt; the Sb source can be Sb oxide and / or Sb salt; and the F source can be fluoride. The raw material resources for this near-infrared antimonate fluorescent material are abundant and inexpensive, meeting the needs of practical production and application.

[0035] Furthermore, in some embodiments, in order to prepare near-infrared antimonate fluorescent materials with superior luminescence properties, the process is first carried out according to the general chemical formula BaAl. 4-4x Fe 4x Sb2O 12 Weigh out Ba, Al, Fe, and Sb sources, and conduct multiple experiments by changing the value of x to determine the optimal x value; then, based on this optimal x value, proceed according to the general chemical formula BaAl 4-4x Fe 4x Sb2O 12-y F y Weigh the raw materials according to the molar ratio of each element.

[0036] By using the above method, the optimal x value can be determined first in order to obtain the Fe with the best luminescence effect. 3+ Excite fluorescent materials, and then introduce F on top of that. - Structural regulation is carried out using F - This causes lattice distortion, for Fe 3+ This provides a highly distorted coordination environment, allowing it to overcome the limitations of the Laporte selection rule, thereby obtaining near-infrared antimonate fluorescent materials with both high luminescence intensity and quantum efficiency. More specifically, in some embodiments, the optimal x value was determined to be 0.5%.

[0037] Furthermore, in some embodiments, the Ba source includes at least one of BaO and BaCO3, preferably BaCO3; the Al source includes at least one of Al2O3 and Al(OH)3, preferably Al2O3; the Fe source includes at least one of Fe2O3, Fe(OH)3, and Fe2(SO4)3, preferably Fe2O3; the Sb source includes at least one of Sb2O3 and SbCl3, preferably Sb2O3; and the F source includes at least one of BaF2 and NH4F, preferably BaF2.

[0038] In the technical solution of the embodiments of the present invention, all of the above-mentioned raw materials are abundant and inexpensive, which is conducive to commercial production and application.

[0039] Furthermore, in some embodiments, the calcination temperature is 1400~1500℃ and the calcination time is 2~4h.

[0040] In the technical solution of the present invention, the above-mentioned calcination process is simple and easy to implement, and the calcination temperature is relatively low, which makes it easy to obtain near-infrared antimonate fluorescent materials with excellent grain growth quality, few surface defects, good physicochemical stability, and ideal fluorescence lifetime.

[0041] The following are some specific embodiments. It should be noted that the embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in this field or according to the product instructions. Reagents or instruments used, unless otherwise specified, are all conventional products that can be obtained commercially.

[0042] I. Preparation Method Example 1 This embodiment provides a method for preparing near-infrared antimonate fluorescent materials, including the following steps: S1, according to the chemical formula BaAl 4-4x Fe 4x Sb2O 12 The stoichiometric ratio in (x=0.25%) is to accurately weigh BaCO3, Al2O3, Fe2O3, and Sb2O3 as raw materials.

[0043] S2. Place the raw materials weighed in step S1 into an agate mortar, add anhydrous ethanol as a dispersant, grind thoroughly until the ethanol evaporates and the raw materials are mixed evenly to obtain a mixed powder.

[0044] S3. Place the mixed powder obtained in step S2 into an alumina crucible and place it in a muffle furnace. Calcinate at 1450°C for 3 hours in air atmosphere, then slowly cool to room temperature to obtain the near-infrared antimonate fluorescent material BaAl. 3.99 Fe0.01 Sb2O 12 .

[0045] Examples 2-5 Examples 2-5 each provide a method for preparing near-infrared antimonate fluorescent materials. Compared with Example 1, the only difference is the change in the chemical formula BaAl. 4-4x Fe 4x Sb2O 12 The values ​​of x in the various embodiments are shown in Table 1.

[0046] Table 1. Values ​​of x and corresponding chemical formulas in Examples 2-5 Example 6 This embodiment provides a method for preparing near-infrared antimonate fluorescent materials, including the following steps: S1, according to the chemical formula BaAl 4-4x Fe 4x Sb2O 12-y F y The stoichiometric ratio in (x=0.5%, y=1%) is used to accurately weigh BaCO3, Al2O3, Fe2O3, Sb2O3, and BaF2 as raw materials.

[0047] S2. Place the raw materials weighed in step S1 into an agate mortar, add anhydrous ethanol as a dispersant, grind thoroughly until the ethanol evaporates and the raw materials are mixed evenly to obtain a mixed powder.

[0048] S3. Place the mixed powder obtained in step S2 into an alumina crucible and place it in a muffle furnace. Calcinate at 1450°C for 3 hours in air atmosphere, then slowly cool to room temperature to obtain the near-infrared antimonate fluorescent material BaAl. 3.99 Fe 0.01 Sb2O 12 .

[0049] Examples 7-12 Examples 7-12 each provide a method for preparing near-infrared antimonate fluorescent materials. Compared with Example 6, the only difference is the change in the chemical formula BaAl. 4-4x Fe 4x Sb2O 12-y F y The values ​​of y in each embodiment are shown in Table 1.

[0050] Table 1. Values ​​of x and y and corresponding chemical formulas in Examples 7-12 II. Performance Testing and Result Analysis The near-infrared antimonate fluorescent materials prepared in Examples 1-12 were analyzed using powder X-ray diffraction (XRD) technology. The obtained XRD patterns are shown below. Figure 1 , Figure 2 As shown. Figure 1 In the figures, x = 0.25%, 0.50%, 0.75%, 1%, and 1.25% correspond to the test results of Examples 1, 2, 3, 4, and 5, respectively. Figure 2 In the figures, y = 0, 1%, 3%, 5%, 7%, 10%, 15%, and 20% correspond to the test results of Examples 2, 6, 7, 8, 9, 10, 11, and 12, respectively. Figure 1-2 It can be seen that the near-infrared antimonate fluorescent materials prepared in each embodiment of this application all have good phase purity.

[0051] Figure 3-7 The emission and excitation spectra of the near-infrared antimonate fluorescent materials prepared in Examples 1-12 are shown. Figure 3-5 It can be seen that the near-infrared antimonate fluorescent materials prepared in Examples 1-5 exhibit a broadband excitation peak in the 200nm-500nm range centered at 355nm under 782nm monitoring, indicating their applicability to WLEDs excited by ultraviolet chips. Under 355nm excitation, the near-infrared antimonate fluorescent materials prepared in Examples 1-5 exhibit broadband near-infrared emission, extending from 600nm to around 1100nm, with the main emission peak wavelength located around 782nm. Furthermore, as the value of x increases in Examples 1-5, the luminescence intensity of the prepared near-infrared antimonate fluorescent materials shows a trend of first increasing and then decreasing, achieving the highest luminescence intensity at x=0.05% (Example 2).

[0052] Furthermore, by Figure 6-7 It can be seen that, based on Example 2, by introducing F - Replace O 2- After structural tuning, the shape of the excitation and emission peaks and the main peak wavelength did not change significantly. Except for a decrease in luminescence intensity at y=3%, the luminescence intensities of the other examples (Examples 6 and Examples 8-12) were all higher than those of Example 2 (y=0), demonstrating that the appropriate addition of F is beneficial to enhancing the luminescence intensity of the near-infrared antimonate fluorescent material. Among them, under 355nm excitation, the luminescence intensity of Example 12 (y=20%) increased to 3.49 times that of Example 2 (y=0), achieving a significant improvement in luminescence intensity.

[0053] Figure 8-9 The quantum efficiency diagrams are shown for the near-infrared antimonate fluorescent materials prepared in Examples 2 and 12, respectively. Figure 8-9It can be seen that the internal quantum efficiency of the near-infrared antimonate fluorescent material prepared in Example 2 (y=0) under 355nm excitation is 13.32, while that of the near-infrared antimonate fluorescent material prepared in Example 12 (y=20%) under 355nm excitation is 27.85%, which is significantly enhanced compared to Example 2, proving that F - Replace O 2- The resulting structural modulation can enhance the quantum efficiency of near-infrared antimonate fluorescent materials.

[0054] Figure 10 The temperature-dependent emission spectrum of the near-infrared antimonate fluorescent material prepared in Example 2 (y=0). Figure 10 It can be seen that when the temperature rises to 423K (150℃), its emission intensity still remains at 67% of the initial intensity, indicating that the near-infrared antimonate fluorescent material has good thermal stability.

[0055] Figure 11 Temperature-dependent emission spectra of the near-infrared antimonate fluorescent material prepared in Example 12 (y=20%). Figure 11 It can be seen that when the temperature rises to 423K (150℃), its emission intensity still remains at 65.6% of the initial intensity, indicating that the F-substituted near-infrared antimonate fluorescent material still maintains good thermal stability.

[0056] In summary, this invention provides a near-infrared antimonate fluorescent material and its preparation method, wherein the chemical formula of the near-infrared antimonate fluorescent material is BaAl. 4-4x Fe 4x Sb2O 12-y F y Furthermore, 0.25%≤x≤2%, 0%≤y≤20%. This invention utilizes BaAl4Sb2O... 12 As a matrix, Fe was introduced. 3+ As an activator ion, and utilizing F - Replace O 2- Anion modulation can effectively improve the luminescence intensity and quantum efficiency of the prepared near-infrared antimonate fluorescent material. The preparation method of the near-infrared antimonate fluorescent material provided by this invention is simple and easy to implement, requires abundant raw material resources, and the prepared near-infrared antimonate fluorescent material can emit near-infrared light with a center wavelength of 782nm. It also exhibits high luminescence intensity, good physicochemical stability, ideal fluorescence lifetime, is green and pollution-free, and has excellent thermal stability, showing good application prospects.

[0057] It should be noted that the present invention is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments that have the same structure and perform the same effects as the technical concept within the scope of the present invention are included within the scope of the present invention. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of the present invention, are also included within the scope of the present invention.

Claims

1. A near-infrared antimonate fluorescent material, characterized in that, The chemical formula of the near-infrared antimonate fluorescent material is BaAl. 4-4x Fe 4x Sb2O 12-y F y Among them, 0.25%≤x≤2%, 0%≤y≤20%.

2. The near-infrared antimonate fluorescent material according to claim 1, characterized in that, 1%≤y≤20%, preferably 5%≤y≤20%.

3. The near-infrared antimonate fluorescent material according to claim 1, characterized in that, x=0.5%。 4. A method for preparing a near-infrared antimonate fluorescent material according to any one of claims 1-3, characterized in that, Includes the following steps: According to the general chemical formula BaAl 4-4x Fe 4x Sb2O 12-y F y The molar ratio of each element in the raw materials is determined by weighing; the raw materials include Ba source, Al source, Fe source, Sb source and F source; After weighing and mixing the raw materials and grinding them thoroughly, the materials are calcined and cooled to obtain near-infrared antimonate fluorescent materials.

5. The method for preparing near-infrared antimonate fluorescent material according to claim 4, characterized in that, The Ba source includes at least one of BaO and BaCO3, preferably BaCO3.

6. The method for preparing near-infrared antimonate fluorescent material according to claim 4, characterized in that, The Al source includes at least one of Al2O3 and Al(OH)3, preferably Al2O3.

7. The method for preparing near-infrared antimonate fluorescent material according to claim 4, characterized in that, The Fe source includes at least one of Fe2O3, Fe(OH)3, and Fe2(SO4)3, preferably Fe2O3.

8. The method for preparing near-infrared antimonate fluorescent material according to claim 4, characterized in that, The Sb source includes at least one of Sb2O3 and SbCl3, preferably Sb2O3.

9. The method for preparing near-infrared antimonate fluorescent material according to claim 4, characterized in that, The F source includes at least one of BaF2 and NH4F, preferably BaF2.

10. The method for preparing near-infrared antimonate fluorescent material according to claim 4, characterized in that, The calcination temperature for the calcination treatment is 1400~1500℃, and the calcination time is 2~4h.

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