Dual-mode rare earth luminescent material, preparation method and application thereof, anti-counterfeiting two-dimensional code, two-dimensional code scanning device and two-dimensional code anti-counterfeiting system
By preparing the dual-mode rare earth luminescent material Ca(1-x-y-z)Ga4O7:xYb3+/yEr/zEu3+, the conversion between red and green is achieved under different wavelengths of light excitation, solving the problem of single excitation mode of existing rare earth luminescent material, and improving the safety and identification accuracy of anti-counterfeiting labels.
Patent Information
- Application Number
- CN202510485561.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-17
- Publication Date
- 2025-08-01
AI Technical Summary
The excitation mode of existing rare earth luminescent materials is single, which leads to low security of anti-counterfeiting labels, easy to be simulated, and cannot achieve dynamic regulation of luminescent color, intensity or life, resulting in static anti-counterfeiting information.
The dual-mode rare earth luminescent material Ca(1-x-y-z)Ga4O7:xYb3+/yEr/zEu3+ is used, and the conversion between red and green is achieved under different wavelength light excitation, combined with the high-temperature solid-phase preparation method, a matrix of a layered structure and a tunnel structure is formed.
It realizes dynamic regulation of luminous color under different wavelengths of light excitation, improves the safety and identification accuracy of anti-counterfeiting materials, has high material stability, and is suitable for anti-counterfeiting markings for high-end products.
Smart Images
Figure CN120399682A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the preparation of inorganic luminescent materials, and particularly to a dual-mode rare earth luminescent material, its preparation method and application, as well as an anti-counterfeiting two-dimensional code, a two-dimensional code scanning device and a two-dimensional code anti-counterfeiting system. Background Art
[0002] With the rapid development of the commodity economy, the importance of anti-counterfeiting technology has become increasingly prominent. Traditional anti-counterfeiting technologies are easily replicated by high-resolution scanners and advanced printing equipment, making it difficult to meet the current anti-counterfeiting requirements.
[0003] Due to their unique electronic layer structure, rare earth luminescent materials have narrow emission spectral lines, enabling precise multi-color identification. At the same time, rare earth luminescent materials have long fluorescence lifetimes, improving the accuracy of anti-counterfeiting detection. Moreover, they have high chemical stability, and their luminescence performance remains stable in different environments such as acids and alkalis, high temperatures, and humidity, ensuring the effectiveness of anti-counterfeiting labels throughout the product life cycle, showing significant advantages in the field of anti-counterfeiting.
[0004] In the prior art, single-mode luminescent materials can only emit light under a single excitation condition, resulting in anti-counterfeiting labels that can only be identified by a single device. In addition, it is impossible to achieve dynamic regulation of luminescence color, intensity, or lifetime, resulting in static anti-counterfeiting information. Attackers can easily simulate the excitation conditions and counterfeit similar luminescence effects, reducing the anti-counterfeiting security. Therefore, it is necessary to develop multi-mode luminescent anti-counterfeiting materials. Summary of the Invention
[0005] The object of the present invention is to solve the problems of single excitation mode of single-mode rare earth luminescent materials and low security of anti-counterfeiting labels prepared therefrom, and to provide a dual-mode rare earth luminescent material, its preparation method and application, as well as an anti-counterfeiting two-dimensional code, a two-dimensional code scanning device and a two-dimensional code anti-counterfeiting system.
[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:[[]]
[0007] A dual-mode rare earth luminescent material, characterized in that the chemical formula of the rare earth luminescent material is:
[0008] Ca (1-x-y-z) Ga4O7:xYb 3+ / yEr / zEu 3+ ;
[0009] wherein, the molar ratio of Ca 2+ , Yb 3+ , Er 3+ , Eu 3+ is: Ca 2+ :Yb 3+ :Er 3+ , Eu 3+=(1 - x - y - z) : x : y : z; 8 mol% ≤ x ≤ 12 mol%, 0.5 mol% ≤ y ≤ 1.5 mol%, 1 mol% ≤ z ≤ 3 mol%.
[0010] Using doped Yb 3+ as the sensitizer for up - conversion luminescence, Er 3+ as the activator, the up - conversion luminescence process is that under the excitation of near - infrared light with a wavelength of 980 nm, Yb 3+ and Er 3+ transfer energy to make the material emit green light (Er 3+ , 546 nm); the doped Er 3+ and Eu 3+ can be used as the luminescence centers for down - conversion luminescence. The down - conversion luminescence process is that under the excitation of ultraviolet light with a wavelength of 379 nm, the material emits green light (Er 3+ , 546 nm), and under the excitation of light with a wavelength of 465 nm, the material emits red light (Eu 3+ , 612 nm). Thus, this rare - earth luminescent material can achieve the conversion between red and green under the excitation of light with different wavelengths.
[0011] Furthermore, the chemical formula of the rare - earth luminescent material is:
[0012] Ca 0.87 Ga4O7:0.1Yb 3+ / 0.01Er / 0.02Eu 3+ .
[0013] Furthermore, the particle size of the rare - earth luminescent material is 55 μm - 62 μm.
[0014] The present invention also provides a preparation method of a dual - mode rare - earth luminescent material, which is characterized in that it includes the following steps:
[0015] Step 1, weigh CaCO3, Ga2O3, Yb2O3, Er2O3 and Eu2O3 with a purity of not less than 99.9% as raw materials according to the molar ratio respectively;
[0016] The molar ratio range of each raw material is CaCO3:Ga2O3:Yb2O3:Er2O3:Eu2O3=(0.835 - 0.905):2:(0.04 - 0.06):(0.0025 - 0.0075):(0.005 - 0.015);
[0017] Step 2, place the above - mentioned raw materials in an agate mortar for sufficient grinding respectively, then transfer them to a quartz crucible for calcination, and cool to room temperature to obtain the crude rare - earth luminescent material;
[0018] Step 3: After grinding the crude rare earth luminescent material, the rare earth luminescent material Ca with a particle size not greater than 60 μm can be obtained. (1-x-y-z) Ga4O7:xYb 3+ / yEr / zEu 3+ 。
[0019] Further, the specific process of Step 2 is as follows:
[0020] Step 2.1: Put the raw materials weighed in Step 1 into an agate mortar and grind for no less than 30 min to obtain a mixed powder.
[0021] Step 2.2: Place the mixed powder in a quartz crucible for high-temperature calcination and cool it to room temperature to obtain the crude rare earth luminescent material.
[0022] Further, Step 2.2 is specifically as follows:
[0023] Place the mixed powder in a quartz crucible, heat it at a heating rate of 4 °C / min to 6 °C / min to 800 °C to 900 °C, calcine for 1.5 h to 2.5 h, then raise the temperature to 1200 °C to 1300 °C, calcine for 5 h to 6 h, and cool it to room temperature to obtain the crude rare earth luminescent material.
[0024] The present invention also provides an application of a dual-mode rare earth luminescent material, which is characterized in that it is used in the preparation of anti-counterfeiting materials.
[0025] The present invention also provides an anti-counterfeiting two-dimensional code, which is characterized in that it is printed with anti-counterfeiting ink, and the anti-counterfeiting ink includes the above-mentioned dual-mode rare earth luminescent material. This anti-counterfeiting two-dimensional code is invisible to the human eye under sunlight and is only visible to the human eye under the excitation of a specific light source.
[0026] The present invention also provides a two-dimensional code scanning device, which is further characterized in that it is used to scan the anti-counterfeiting two-dimensional code; it includes: a photoelectric scanning module, a Bluetooth module, a status indication module, a central processing module, and a switching power supply module.
[0027] The switching power supply module is electrically connected to the photoelectric scanning module, the Bluetooth module, the central processing module, and the status indication module respectively, and is used to supply power to the photoelectric scanning module, the Bluetooth module, the central processing module, and the status indication module.
[0028] The optoelectronic code scanning module includes an optical signal emitting unit and an optoelectronic detecting unit, and the optical signal emitting unit and the optoelectronic detecting unit are electrically connected to the central processing module respectively; the optical signal emitting unit is used to emit optical signals with wavelengths of 379nm, 465nm, and 980nm to the anti-counterfeiting two-dimensional code under the adjustment of the central processing module, and the optoelectronic detecting unit is used to receive the reflected optical signal of the anti-counterfeiting two-dimensional code and input it to the central processing module for amplification, filtering, and noise suppression processing, and then convert it into a digital signal;
[0029] The status indicating module is electrically connected to the optoelectronic code scanning module and is used to display the working status of the optoelectronic code scanning module;
[0030] The central processing module is connected to the host computer through a Bluetooth module and is used to transmit the digital signal of the anti-counterfeiting two-dimensional code to the host computer.
[0031] A two-dimensional code anti-counterfeiting system is characterized in that it includes the anti-counterfeiting two-dimensional code, the two-dimensional code scanning device, and a host computer electrically connected to the two-dimensional code scanning device;
[0032] The two-dimensional code scanning device is used to scan the anti-counterfeiting two-dimensional code to obtain a digital signal, and the host computer is used to process the digital signal, generate two-dimensional code information and identify it.
[0033] The beneficial effects of the present invention are:
[0034] (1) A dual-mode rare-earth luminescent material provided by the present invention uses doped Yb 3+ as a sensitizer for upconversion luminescence, and Er 3+ as an activator. The upconversion luminescence process is that under the excitation of near-infrared light with a wavelength of 980nm, Yb 3+ and Er 3+ emit green light (Er 3+ , 546nm) through energy transfer; the doped Er 3+ and Eu 3+ can be used as the luminescence centers for downconversion luminescence. The downconversion luminescence process is that under the excitation of ultraviolet light with a wavelength of 379nm, the material emits green light (Er 3+ , 546nm), and under the excitation of light with a wavelength of 465nm, the material emits red light (Eu 3+ , 612nm). Thus, the rare-earth luminescent material can achieve the conversion between red and green under the excitation of light with different wavelengths, integrate the upconversion luminescence mode and the downconversion luminescence mode, and has high luminescence color resolution and good stability.
[0035] (2) The preparation method of a dual-mode rare earth luminescent material provided by the present invention adopts the high-temperature solid-phase method. CaCO3, Ga2O3, Yb2O3, Er2O3 and Eu2O3 are selected as raw materials to form a matrix CaGa4O7 with a layered structure and a tunnel structure, and then Eu is doped efficiently. 3+ , Yb 3+ , Er 3+ Three kinds of rare earth ions. The surface of the prepared sample is smooth, the boundary is clear, the particle shape is irregular, and the particle size is uniform.
[0036] (3) A dual-mode rare earth luminescent material provided by the present invention can be made into anti-counterfeiting ink and then an anti-counterfeiting two-dimensional code is prepared by screen printing technology. This two-dimensional code is invisible to the human eye under sunlight and is only visible to the human eye under the excitation of a specific light source. Then, the anti-counterfeiting detection and identification of the two-dimensional code are carried out through the scanning code system of the two-dimensional code printed with the dual-mode rare earth luminescent material, and it can be used in fields with high safety requirements such as medicines and high-end electronic products. BRIEF DESCRIPTION OF THE DRAWINGS
[0037] Figure 1 is the XRD pattern of Ca 0.87 Ga4O7:0.1Yb 3+ / 0.01Er / 0.02Eu 3+ of a dual-mode rare earth luminescent material provided by the present invention in Example 1;
[0038] Figure 2 is the transmission electron microscope image magnified 1000 times of Ca 0.87 Ga4O7:0.1Yb 3+ / 0.01Er / 0.02Eu 3+ of a dual-mode rare earth luminescent material provided by the present invention in Example 1;
[0039] Figure 3 is the up-conversion emission spectrum and down-conversion emission spectrum diagram of Ca 0.87 Ga4O7:0.1Yb 3+ / 0.01Er / 0.02Eu 3+ of a dual-mode rare earth luminescent material provided by the present invention in Example 1;
[0040] Figure 4 is the module connection diagram of the scanning code system of the two-dimensional code printed with a dual-mode rare earth luminescent material provided by the present invention;
[0041] Figure 5 is obtained in Example 1 of the present invention through Figure 4 The two-dimensional code result diagram obtained by exciting the anti-counterfeiting two-dimensional code printed with the anti-counterfeiting ink prepared by the shown scanning code system with light sources of different wavelengths.
[0042] In the figure, 1 - Photoelectric code scanning module; 2 - Bluetooth module; 3 - Status indication module; 4 - Central processing module; 5 - Switching power supply module. Detailed implementation
[0043] To make the objectives, advantages and features of the present invention clearer, the following further elaborates in detail a dual - mode rare - earth luminescent material, its preparation method, its application, and a code scanning system for a two - dimensional code printed thereby in conjunction with the accompanying drawings and specific embodiments. According to the following specific implementation, the advantages and features of the present invention will be clearer.
[0044] Example 1
[0045] A dual - mode rare - earth luminescent material, with the chemical formula:
[0046] Ca 0.87 Ga4O7:0.1Yb 3+ / 0.01Er / 0.02Eu 3+ ; The particle size is 55μm.
[0047] The preparation method of 2 mmol of Ca 0.87 Ga4O7:0.1Yb 3+ / 0.01Er / 0.02Eu 3+ is as follows:
[0048] Weigh the raw materials and the mass of each raw material are respectively: CaCO3: 0.1742 g, Ga2O3: 0.7498 g, Yb2O3: 0.0394 g, Er2O3: 0.0038 g, Eu2O3: 0.0070 g.
[0049] Place the weighed raw materials in an agate mortar, grind them for 35 min, and then transfer them to a quartz crucible.
[0050] Transfer the quartz crucible to a muffle furnace, set the heating rate at 5°C / min. First, calcine the raw materials in an air atmosphere at 800°C for 2 h, then still maintain the original heating rate, raise the temperature to 1300°C, keep calcining for 6 h, and cool to room temperature.
[0051] After finely grinding the calcined and cooled raw materials, a dual - mode rare - earth luminescent material can be obtained.
[0052] The XRD pattern of the dual - mode rare - earth luminescent material prepared in this example is as Figure 1 shown. This figure shows that the rare - earth luminescent material Ca 0.87 Ga4O7:0.1Yb 3+ / 0.01Er / 0.02Eu 3+ has a correct phase structure.
[0053] The transmission electron microscope image at 1000 times magnification of a dual-mode rare-earth luminescent material prepared in this example is as follows Figure 2 shown. According to Figure 2 it can be known that the rare-earth luminescent material Ca 0.87 Ga4O7:0.1Yb 3+ / 0.01Er / 0.02Eu 3+ prepared in this example is an irregular particle with a smooth surface and clear boundaries, and the particle size is about 60μm.
[0054] Optical performance tests were carried out on a dual-mode rare-earth luminescent material prepared in this example, and the obtained up-conversion emission spectrum is as follows Figure 3 shown. This figure shows the green emission of this rare-earth luminescent material at 546nm; the obtained down-conversion spectrum is as follows Figure 3 shown. This figure shows the green emission of Er 3+ of this rare-earth luminescent material at 546nm and the red emission of Eu 3+ at 612nm.
[0055] A dual-mode rare-earth luminescent material prepared in this example was mixed evenly with metal ink in a mass ratio of 5:1 to make anti-counterfeiting ink, and the printed anti-counterfeiting QR code. In order to facilitate the detection of the authenticity of the anti-counterfeiting QR code, this example also provides a QR code scanning system printed with a dual-mode rare-earth luminescent material, including: a photoelectric scanning module 1, a Bluetooth module 2, a status indication module 3, a central processing module 4, and a switching power supply module 5.
[0056] The switching power supply module 5 is electrically connected to the photoelectric scanning module 1, the central processing module 4, and the status indication module 3 respectively, and is used to supply power to the photoelectric scanning module 1, the central processing module 4, and the status indication module 3;
[0057] The photoelectric scanning module 1 includes an optical signal emitting unit and a photoelectric detection unit. The optical signal emitting unit and the photoelectric detection unit are electrically connected to the central processing module 4 respectively; the optical signal emitting unit is used to emit optical signals with wavelengths of 379nm, 465nm, and 980m to the anti-counterfeiting QR code under the adjustment of the central processing module 4. By observing, it is judged whether it simultaneously satisfies that when excited at 379nm, the anti-counterfeiting QR code emits green light, when excited at 465nm, the anti-counterfeiting QR code emits red light, and when excited at 980m, the anti-counterfeiting QR code emits green light. If it is satisfied simultaneously, then this QR code is prepared with the dual-mode rare-earth luminescent material of this example. The photoelectric detection unit is used to receive the reflected optical signal of the anti-counterfeiting QR code and input it to the central processing module 4 for amplification, filtering, and noise suppression processing and then convert it into a digital signal.
[0058] The status indication module 3 is electrically connected to the photoelectric scanning module 1 and is used to display the working status of the photoelectric scanning module 1.
[0059] The central processing module 4 is connected to the host computer through the Bluetooth module 2, and is used to transmit the digital signal of the anti-counterfeiting two-dimensional code to the host computer for reading the two-dimensional code information.
[0060] A two-dimensional code anti-counterfeiting system includes an anti-counterfeiting two-dimensional code, a two-dimensional code scanning device, and a host computer electrically connected to the two-dimensional code scanning device; the two-dimensional code scanning device is used to scan the anti-counterfeiting two-dimensional code to obtain a digital signal, and the host computer is used to process the digital signal, generate two-dimensional code information and identify it.
[0061] The dual-mode rare-earth luminescent material prepared in this embodiment can be used in the preparation of anti-counterfeiting materials, and can also be made into anti-counterfeiting ink to print anti-counterfeiting two-dimensional codes. It is excited by different light sources on the Figure 4 scanning device shown, and the results are as Figure 5 shown. The two-dimensional code does not show color under sunlight and is invisible to the human eye. Under the excitation of 980nm near-infrared light, the two-dimensional code shows green, and under the excitation of 465nm wavelength light, the two-dimensional code shows red, effectively encrypting the two-dimensional code information.
[0062] Embodiment 2
[0063] The difference between this embodiment and Embodiment 1 is that:
[0064] The chemical formula of the rare-earth luminescent material is:
[0065] Ca 0.79 Ga4O7:0.08Yb 3+ / 0.015Er / 0.03Eu 3+ ; the particle size is 60μm.
[0066] The preparation method of 2mmol of Ca 0.79 Ga4O7:0.08Yb 3+ / 0.015Er / 0.03Eu 3+ is as follows:
[0067] Weigh the raw materials and the mass of each raw material are CaCO3: 0.1752g, Ga2O3: 0.7498g, Yb2O3: 0.0315g, Er2O3: 0.0057g, Eu2O3: 0.0106g.
[0068] Transfer the weighed raw materials to an agate mortar, grind them for 42 minutes, and then transfer them to a quartz crucible.
[0069] Transfer the quartz crucible to a muffle furnace, set the heating rate at 4°C / min, first calcine the raw materials in an air atmosphere at 850°C for 2h, then still maintain the original heating rate, raise the temperature to 1300°C and keep calcining for 6h, and cool to room temperature.
[0070] After finely grinding the calcined and cooled raw materials, a dual-mode rare earth luminescent material can be obtained.
[0071] Example 3
[0072] The difference between this example and Example 1 is that:
[0073] The chemical formula of the rare earth luminescent material is:
[0074] Ca 0.85 Ga4O7:0.12Yb 3+ / 0.005Er / 0.025Eu 3+ ; The particle size is 62 μm.
[0075] 2 mmol of Ca 0.85 Ga4O7:0.12Yb 3+ / 0.005Er / 0.025Eu 3+ The preparation method is as follows:
[0076] Weigh the raw materials and the mass of each raw material is CaCO3: 0.1702 g, Ga2O3: 0.7498 g, Yb2O3: 0.0473 g, Er2O3: 0.0019 g, Eu2O3: 0.0088 g.
[0077] Put the weighed raw materials into an agate mortar, grind them for 35 min, and then transfer them to a quartz crucible.
[0078] Transfer the quartz crucible to a muffle furnace, set the heating rate at 4 °C / min. First, calcine the raw materials in an air atmosphere at 900 °C for 2.5 h, then still maintain the original heating rate, raise the temperature to 1300 °C, keep calcining for 6 h, and cool to room temperature.
[0079] After finely grinding the calcined and cooled raw materials, a dual-mode rare earth luminescent material can be obtained.
[0080] In summary, a dual-mode rare earth luminescent material provided by the present invention is a dual-mode rare earth luminescent material based on grossite-type oxide, in which the doped Yb 3+ acts as a sensitizer for upconversion luminescence, Er 3+ acts as an activator. The upconversion luminescence process is that under the excitation of near-infrared light with a wavelength of 980 nm, Yb 3+ and Er 3+ emit green light (Er 3+ , 546 nm) through energy transfer. Er 3+ and Eu 3+It can be used as a luminescence center for down-conversion luminescence. The down-conversion luminescence process is that under the excitation of ultraviolet light with a wavelength of 379 nm, this material emits green light (Er 3+ , 546 nm), and under the excitation of light with a wavelength of 465 nm, this material emits red light (Eu 3+ , 612 nm). Thus, this rare-earth luminescent material can achieve the conversion between red and green under the excitation of light with different wavelengths. Integrating the up-conversion luminescence mode and the down-conversion luminescence mode together has high luminescence color resolution and good stability. It can be used to make anti-counterfeiting ink and then prepare anti-counterfeiting two-dimensional codes by screen printing technology.
[0081] In the preparation process of a dual-mode rare-earth luminescent material of the present invention, the high-temperature solid-phase method is adopted. CaCO3, Ga2O3, Yb2O3, Er2O3 and Eu2O3 are selected as raw materials to form a matrix CaGa4O7 with a layered structure and a tunnel structure, and then Eu 3 + , Yb 3+ , Er 3+ three kinds of rare-earth ions are doped efficiently. These rare-earth ions occupy Ca 2+ in the crystal lattice, so as to obtain Ca (1-x-y-z) Ga4O7:xYb 3+ / yEr / zEu 3+ . The prepared sample has a smooth surface, clear boundaries, irregular particle shapes, uniform particle sizes and a simple preparation process.
[0082] The above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting the present application; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the present application.
Claims
1. A dual-mode rare earth luminescent material, characterized in that, The chemical formula of the rare earth luminescent material is: Ca (1-x-y-z) Ga4O7:xYb 3+ / yEr / zEu 3+ ; Among them, Ca 2+ , Yb 3+ , Er 3+ , Eu 3+ The molar ratio of is: Ca 2+ : Yb 3+ : Er 3+ : Eu 3+ = (1 - x - y - z): x: y: z; 8 mol% ≤ x ≤ 12 mol%, 0.5 mol% ≤ y ≤ 1.5 mol%, 1 mol% ≤ z ≤ 3 mol%.
2. The dual-mode rare earth luminescent material according to claim 1, wherein, The chemical formula of the rare earth luminescent material is: Ca 0.87 Ga4O7:0.1Yb 3+ / 0.01Er / 0.02Eu 3+ 。 3. A dual-mode rare earth luminescent material according to claim 1 or 2, characterized in that, The particle size of the rare earth luminescent material is 55 μm to 62 μm.
4. A method for preparing a dual-mode rare earth luminescent material according to claim 1, characterized in that, It includes the following steps: Step 1: Weigh CaCO3, Ga2O3, Yb2O3, Er2O3, and Eu2O3 with a purity of not less than 99.9% respectively according to the molar ratio as raw materials; The molar ratio range of each raw material is CaCO3:Ga2O3:Yb2O3:Er2O3:Eu2O3 = (0.835 - 0.905):2:(0.04 - 0.06):(0.0025 - 0.0075):(0.005 - 0.015); Step 2: Respectively place the above raw materials in an agate mortar for sufficient grinding and then transfer them to a quartz crucible for calcination, and cool to room temperature to obtain a crude rare earth luminescent material; Step 3: After grinding the crude rare earth luminescent material, the rare earth luminescent material Ca (1-x-y-z) Ga4O7:xYb 3+ / yEr / zEu 3+ .
5. The preparation method of a dual-mode rare earth luminescent material according to claim 4, characterized in that, The specific process of Step 2 is: Step 2.1: Put the raw materials weighed in Step 1 into an agate mortar for grinding for not less than 30 minutes to obtain a mixed powder; Step 2.2: Place the mixed powder in a quartz crucible for high-temperature calcination and cool to room temperature to obtain a crude rare earth luminescent material.
6. The preparation method of a dual-mode rare earth luminescent material according to claim 5, wherein, Step 2.2 is specifically: Place the mixed powder in a quartz crucible, heat it at a heating rate of 4 °C / min to 6 °C / min to 800 °C to 900 °C, calcine for 1.5 h to 2.5 h, then raise the temperature to 1200 °C to 1300 °C, calcine for 5 h to 6 h, and cool to room temperature to obtain a crude rare earth luminescent material.
7. Use of the dual-mode rare earth luminescent material according to any one of claims 1 to 3, characterized in that, It is used for preparing anti-counterfeiting materials.
8. An anti-counterfeiting two-dimensional code, characterized in that: It is made by printing with anti-counterfeiting ink, and the anti-counterfeiting ink includes the dual-mode rare earth luminescent material described in any one of Claims 1 to 4.
9. A two-dimensional code scanning device, characterized in that, It is used for scanning the anti-counterfeiting two-dimensional code described in Claim 8; it includes: a photoelectric code scanning module (1), a Bluetooth module (2), a status indication module (3), a central processing module (4), and a switching power supply module (5); The switching power supply module (5) is electrically connected to the photoelectric code scanning module (1), the Bluetooth module (2), the central processing module (4), and the status indication module (3) respectively, and is used to supply power to the photoelectric code scanning module (1), the Bluetooth module (2), the central processing module (4), and the status indication module (3); The photoelectric code scanning module (1) includes an optical signal emitting unit and a photoelectric detection unit, and the optical signal emitting unit and the photoelectric detection unit are electrically connected to the central processing module (4) respectively; the optical signal emitting unit is used to emit optical signals with wavelengths of 379 nm, 465 nm, and 980 nm to the anti-counterfeiting two-dimensional code under the adjustment of the central processing module (4), and the photoelectric detection unit is used to receive the reflected optical signal of the anti-counterfeiting two-dimensional code and input it to the central processing module (4) for amplification, filtering, and noise suppression processing and then convert it into a digital signal; The status indication module (3) is electrically connected to the photoelectric code scanning module (1) and is used to display the working status of the photoelectric code scanning module (1); The central processing module (4) is connected to the upper computer through the Bluetooth module (2) and is used to transmit the digital signal of the anti-counterfeiting two-dimensional code to the upper computer.
10. A two-dimensional code anti-counterfeiting system, characterized in that, Comprising the anti-counterfeiting two-dimensional code described in claim 8, the two-dimensional code scanning device described in claim 9, and a host computer electrically connected to the two-dimensional code scanning device; The two-dimensional code scanning device is used to scan the anti-counterfeiting two-dimensional code to obtain a digital signal, and the host computer is used to process the digital signal, generate two-dimensional code information and identify it.