Carbon dot-based afterglow material with dual-mode ultra-wide emission range as well as preparation method and application of carbon dot-based afterglow material

Abstract

The invention discloses a dual-mode carbon dot-based afterglow material with an ultra-wide emission range, a preparation method and application. The preparation method comprises the following steps: uniformly dissolving a carbon source precursor, a matrix precursor and a combustion improver in a mixed solution of deionized water and ethanol; and heating and calcining the solution obtained after dissolving to obtain the carbon dot-based afterglow material. According to the invention, through a mode of coating the carbon dots with the matrix, the carbon dot-based afterglow material has a dual-afterglow emission characteristic, and the carbon dot-based afterglow material can realize a 250nm ultra-wide afterglow emission range from ultraviolet to red light by adjusting the excitation wavelength, and meanwhile, the afterglow service life is relatively long, so that the carbon dot-based afterglow material can be applied to advanced anti-counterfeiting and photoelectric equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of afterglow materials, and in particular to a carbon dot-based afterglow material with a dual-mode ultra-wide emission range, a preparation method thereof, and applications thereof. Background Art

[0002] Traditional inorganic afterglow materials can only achieve long-lasting afterglow by doping with rare earth elements and precious metal ions. These materials suffer from the high toxicity of rare earth ions, high cost, and high biotoxicity. Organic afterglow materials have seen rapid development in recent years, but their biotoxicity remains unclear, limiting their practical application.

[0003] Carbon quantum dots (CDs) are a new type of quasi-zero-position luminescent nanomaterial. Due to their advantages such as simple preparation, wide availability, easy modification and good biocompatibility, encapsulating CDs in organic or inorganic matrices is an effective way to achieve a long afterglow effect. This makes CDs show broad application potential in information encryption, sensing, bioimaging and optoelectronic devices.

[0004] With the in-depth exploration of carbon dot-based long afterglow materials, researchers have made significant academic progress in their long afterglow characteristics and luminescence mechanisms. The choice of matrix materials has also expanded from the initial polyvinyl alcohol (PVA) to a variety of materials such as silica, cyanuric acid, boric acid, aluminum oxide and aluminate. Although the research on carbon dot-based long afterglow materials has achieved remarkable results, there are still some shortcomings: (1) The afterglow color produced under different excitation light sources is relatively fixed, and the luminescence type is single; (2) The excitation range is limited, and usually high-energy ultraviolet light excitation is required to show excellent room temperature long afterglow performance, which limits practical applications; (3) The emission range is narrow, and it is difficult to achieve ultra-wide range afterglow emission in a single system; (4) The luminescence is mainly concentrated in the blue-green light region, and it is difficult to achieve shorter wavelength ultraviolet light or longer wavelength red light afterglow emission.

[0005] Therefore, it is particularly necessary to develop a carbon dot-based long afterglow material that can achieve dual-mode emission in a single system and has an ultra-wide excitation and emission range, which will provide new possibilities for expanding the application fields of carbon dot-based long afterglow materials. Summary of the Invention

[0006] The purpose of the present invention is to provide a carbon dot-based afterglow material with a dual-mode ultra-wide emission range, a preparation method and an application. By coating carbon dots with a matrix, the carbon dot-based afterglow material has dual afterglow emission characteristics, and the carbon dot-based afterglow material can achieve an ultra-wide afterglow emission range of 250nm from ultraviolet to red light by adjusting the excitation wavelength. At the same time, the afterglow lifetime is long, and it can be used in advanced anti-counterfeiting and optoelectronic equipment.

[0007] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0008] The present invention provides a method for preparing a carbon dot-based afterglow material with a dual-mode ultra-wide emission range, comprising the following steps:

[0009] Step 1: Dissolve the carbon source precursor, matrix precursor and combustion aid evenly in a mixed solution of deionized water and ethanol;

[0010] Step 2: heating and calcining the solution obtained after dissolution to obtain a carbon dot-based afterglow material.

[0011] Preferably, the carbon source precursor in the above preparation method is an aromatic compound, and the aromatic compound includes at least one of benzamide, 1-naphthoic acid, 1,8-naphthalene dicarboxylic acid, terephthalic acid, 1,2,4,5-benzenetetracarboxylic acid, 1,4,5,8-naphthalenetetracarboxylic acid, and fluoranthene.

[0012] Preferably, the matrix precursor in the above preparation method comprises magnesium salt and aluminum salt, wherein Mg in the magnesium salt is 2 + and Al in the aluminum salt 3+ The molar ratio of the matrix precursor is 1: (2 to 6), and the matrix precursor generates a MgAl2O4 matrix after heating and calcining.

[0013] Preferably, the magnesium salt includes one of magnesium chloride hexahydrate and magnesium nitrate hexahydrate; the aluminum salt includes one of aluminum chloride hexahydrate and aluminum nitrate nonahydrate.

[0014] Preferably, the heating and calcining in the above preparation method is performed at a temperature of 550-700° C. and for a time of 1 to 3 hours.

[0015] Preferably, the carbon source precursor and Mg in the above preparation method 2+ The molar ratio is (0.003~0.1):1.

[0016] Preferably, in the above preparation method, the combustion aid is urea, and the urea and Mg 2+ The molar ratio is (1-12):1.

[0017] The present invention also provides a dual-mode ultra-wide emission range carbon dot-based afterglow material, which is prepared by the above-mentioned preparation method and has the dual afterglow characteristics of emitting delayed fluorescence and room temperature phosphorescence. By adjusting the excitation wavelength, an ultra-wide afterglow emission range of 250nm can be achieved.

[0018] The present invention also provides an application of a dual-mode ultra-wide emission range carbon dot-based afterglow material. The dual-mode ultra-wide emission range carbon dot-based afterglow material can be applied in optoelectronic equipment and anti-counterfeiting fields.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The carbon dot-based afterglow material of the present invention continues to emit light after the excitation source stops, showing a significant afterglow effect. Moreover, it can show the afterglow effect under excitation in the laser wavelength range of 254nm-450nm, and has an ultra-wide afterglow excitation wavelength range.

[0021] The carbon dot-based afterglow material of the present application can achieve emission from the ultraviolet region of 378nm to the red light region of 628nm by tuning the excitation wavelength from 254nm to 450nm, thereby achieving an ultra-wide afterglow emission range of 250nm from ultraviolet to red light; and the carbon dot-based afterglow material has an afterglow lifetime of 17.8ms at 277nm in the ultraviolet region and an afterglow lifetime of 550ms at 450nm in the infrared region, which can be applied in the technical field of optoelectronic equipment.

[0022] The carbon dot-based afterglow material of the present application has the characteristics of delayed fluorescence under 277nm excitation, phosphorescence under 450nm excitation, and dual afterglow emission characteristics, and can be applied in the field of advanced anti-counterfeiting technology.

[0023] The preparation process of the carbon dot-based afterglow material of the present application is simple, and the instruments and materials used are low-cost and easy to obtain. The prepared carbon dot-based afterglow material has dual afterglow emission characteristics and can be used in the fields of advanced anti-counterfeiting and optoelectronic equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] It should be noted that the CDs@MgAl2O4 shown in the accompanying drawings is specifically a carbon dot-based afterglow material with a dual-mode ultra-wide emission range.

[0025] Figure 1 The afterglow graphs of the dual-mode ultra-wide emission range carbon dot-based afterglow material prepared in Example 1 are respectively excited at wavelengths of 254 nm, 365 nm, 420 nm, and 450 nm and for a period of time after irradiation is stopped;

[0026] Figure 2 This is a transmission electron microscope (TEM) image of the afterglow material in Example 1 of the present invention;

[0027] Figure 3 is an X-ray diffraction pattern of the dual-mode ultra-wide emission range carbon dot-based afterglow material prepared in Example 1;

[0028] Figure 4 1 is a fluorescence emission spectrum of the carbon dot-based afterglow material with a dual-mode ultra-wide emission range prepared in Example 1 at different excitation wavelengths;

[0029] Figure 55a is a graph of the afterglow emission spectrum of the carbon dot-based afterglow material with a dual-mode ultra-wide emission range obtained in Example 1 at different excitation wavelengths; wherein 5a is a graph of the afterglow emission spectrum under different excitations, Figure 5 b is the normalized afterglow emission spectrum under different excitations;

[0030] Figure 6 1 is a normalized emission spectrum of the carbon dot-based afterglow material with a dual-mode ultra-wide emission range prepared in Example 1 at excitation wavelengths of 277 nm and 450 nm, respectively;

[0031] Figure 7 The fluorescence and phosphorescence emission spectra of the dual-mode ultra-wide emission range carbon dot-based afterglow material prepared in Example 1 at excitation wavelengths of 277nm and 450nm are shown; Figure 7 a is a comparison of fluorescence and phosphorescence emission spectra at an excitation wavelength of 277 nm. Figure 7 b is a comparison of fluorescence and phosphorescence emission spectra at an excitation wavelength of 450 nm;

[0032] Figure 8 : is the afterglow lifetime decay curve of the dual-mode ultra-wide emission range carbon dot-based afterglow material prepared in Example 1 at excitation wavelengths of 277nm and 450nm; wherein Figure 8 a is the afterglow lifetime decay curve at 277nm excitation wavelength, Figure 8 b is the afterglow lifetime decay curve at 450nm excitation wavelength;

[0033] Figure 9 This is an application effect diagram of the carbon dot-based afterglow material with dual-mode ultra-wide emission range in Example 4;

[0034] Figure 10 This is a diagram showing the application effect of the carbon dot-based afterglow material with a dual-mode ultra-wide emission range in Example 5. DETAILED DESCRIPTION

[0035] The present embodiment will be further described below in conjunction with the embodiments and drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention so that those skilled in the art can better understand the present invention, rather than to limit the scope of protection of the present invention.

[0036] The present application provides a method for preparing a dual-mode ultra-wide emission range carbon dot-based afterglow material, comprising the following steps:

[0037] Step 1: Evenly dissolve the carbon source precursor, matrix precursor and combustion aid in a mixed solution of deionized water and ethanol.

[0038] Specifically, the carbon source precursor is an aromatic compound, and the aromatic compound includes at least one of benzamide, 1-naphthoic acid, 1,8-naphthalene dicarboxylic acid, terephthalic acid, 1,2,4,5-benzenetetracarboxylic acid, 1,4,5,8-naphthalenetetracarboxylic acid, and fluoranthene.

[0039] The matrix precursor includes magnesium salt and aluminum salt, wherein Mg 2+ and Al in the aluminum salt 3+ The molar ratio of the matrix precursor is 1:(2-6), and the matrix precursor generates a MgAl2O4 matrix after heating and calcining. The magnesium salt is specifically magnesium chloride hexahydrate or magnesium nitrate hexahydrate; the aluminum salt is specifically aluminum chloride hexahydrate or aluminum nitrate nonahydrate.

[0040] Carbon source precursor and Mg 2+ The molar ratio is (0.003~0.1):1.

[0041] The combustion aid is urea, which is mixed with Mg 2+ The molar ratio is (1-12):1.

[0042] In this application, the carbon dot-based afterglow material is obtained by a one-step calcination method from a MgAl2O4 precursor and a carbon source precursor. Under the action of high temperature, the carbon source precursor is in situ generated and embedded in the MgAl2O4 matrix, thereby obtaining a carbon dot-based afterglow material with an ultra-wide emission range of ultraviolet and red light emission.

[0043] Step 2: Heat and calcine the solution obtained after dissolution to obtain a solid composite; wherein the heating and calcining temperature is 550-700℃ and the heating and calcining time is 1-3h. During the heating process, the carbon source precursor generates carbon quantum dots in situ, Mg 2+ and Al 3+ It gradually transforms into MgAl2O4 with a rigid structure. The rigid structure of MgAl2O4 protects the carbon quantum dots, suppresses the non-radiative vibration of the carbon quantum dots, and isolates the carbon quantum dots from the quencher in the surrounding environment, effectively suppressing the non-radiative transition and stabilizing the excited triplet state, thereby making the afterglow effect significant and improving the afterglow lifetime.

[0044] Step 3: Grind the solid composite to obtain a carbon dot-based afterglow material.

[0045] Example 1

[0046] A method for preparing a dual-mode ultra-wide emission range carbon dot-based afterglow material:

[0047] Step 1: Weigh 1 mg of 1,4,5,8-naphthalenetetracarboxylic acid, 203.3 mg of magnesium chloride hexahydrate, 1207.2 mg of aluminum chloride hexahydrate, and 180.1 mg of urea and transfer them to a crucible. Add 4 ml of a 1:1 mixture of ethanol and water, and sonicate for 5 minutes to dissolve all the solids.

[0048] In this step, Mg in magnesium salt 2+ and Al in the aluminum salt 3+ The molar ratio of carbon source precursor and Mg is 1:5; 2+ The molar ratio of urea to Mg is 0.0037:1; 2+ The molar ratio is 5:1.

[0049] Step 2: The above solution was transferred to a muffle furnace, heated to 600° C. at a heating rate of 5° C. / min, and maintained for 2 h, after which a solid composite was obtained.

[0050] Step three: Grind the solid composite into solid powder using an agate mortar to obtain a carbon dot-based afterglow material CDs@MgAl2O4 with a dual-mode ultra-wide emission range.

[0051] Figure 1 The following are actual pictures of the carbon dot-based afterglow material CDs@MgAl2O4 prepared in this example under excitation of light sources with wavelengths of 254nm, 365nm, 420nm, and 450nm, as well as a period of time after cessation of irradiation. The material shows different afterglow colors under excitation of different light sources, and the afterglow brightness weakens over time until it is no longer observable. This indicates that the carbon dot-based afterglow material can exhibit an afterglow effect under excitation of laser wavelengths in the range of 254nm-450nm, and has an ultra-wide afterglow excitation wavelength range.

[0052] Figure 2 This is the TEM image of CDs@MgAl2O4 prepared as described above. Figure 2 It can be seen in a that there are obvious lattice fringes with a lattice spacing of 0.21 nm, corresponding to the (100) crystal plane of graphitic carbon. Figure 2 b is the particle size distribution diagram of carbon dots. The average particle size of carbon dots is 2.73 nm, which proves the formation of carbon dots.

[0053] Figure 3This is the X-ray diffraction pattern of the carbon dot-based afterglow material CDs@MgAl2O4 prepared in this embodiment. The diffraction peaks at 2θ=31.2°, 36.8°, 44.7°, 59.3°, and 65.2° match the standard card PDF#21-1152 of MgAl2O4, indicating that the carbon dot-based afterglow material has a MgAl2O4 structure. In other words, the magnesium chloride hexahydrate and aluminum chloride hexahydrate in the matrix precursor synthesized the MgAl2O4 matrix during the calcination process in step 2. The MgAl2O4 matrix has a face-centered cubic skeleton with a highly symmetrical lattice structure. 2+ The coordination number is 4 (tetrahedral coordination), Al 3+ The coordination number is 6 (octahedral coordination), this distribution makes the MgAl2O4 structure more stable, and Al 3+ The bond lengths and angles within the octahedral environment contribute to maintaining the rigidity of the crystal. The rigid structure of MgAl2O4 protects the carbon quantum dots generated by the carbon source, suppresses their non-radiative vibrations, and isolates them from quenchers in the surrounding environment, effectively inhibiting non-radiative transitions and stabilizing the excited triplet state, thereby promoting afterglow emission.

[0054] Figure 4 It is the fluorescence emission spectrum of the carbon dot-based afterglow material CDs@MgAl2O4 at different excitation wavelengths in this embodiment. If the fluorescence emission spectrum is consistent with the afterglow emission spectrum, it is delayed fluorescence. If the afterglow emission spectrum is red-shifted relative to the fluorescence spectrum, it is phosphorescence.

[0055] Figure 5 1 is the afterglow emission spectrum of the carbon dot-based afterglow material CDs@MgAl2O4 at different excitation wavelengths in this embodiment. Figure 5 a is the afterglow emission spectrum, Figure 5 b is the normalized afterglow spectrum. As the excitation wavelength changes, the emission peak changes, indicating that the carbon dot-based afterglow material CDs@MgAl2O4 has multiple luminescence centers.

[0056] Figure 6 This is the normalized emission spectrum of the carbon dot-based afterglow material CDs@MgAl2O4 in this embodiment under excitation at 277nm and 450nm respectively. It can be seen from the figure that the emission peak is located at 378nm under 277nm excitation, and the emission peak is located at 628nm under 450nm excitation. By coordinating the excitation wavelength, emission from the 378nm ultraviolet region to the 628nm red light region can be achieved, realizing an ultra-wide afterglow emission range of 250nm from ultraviolet to red light.

[0057] Figure 7These are the fluorescence emission spectrum of the carbon dot-based afterglow material CDs@MgAl2O4 at an excitation wavelength of 277 nm and the phosphorescence emission spectrum at an excitation wavelength of 450 nm in this embodiment. Figure 7 a shows that under 277nm excitation, the fluorescence spectrum coincides with the afterglow spectrum, proving that the carbon dot-based afterglow material has the characteristics of delayed fluorescence; Figure 7 b shows that under 450nm excitation, the afterglow emission is red-shifted relative to the fluorescence, proving that the carbon dot-based afterglow material has the characteristics of phosphorescence. This shows that the carbon dot-based afterglow material in this application has the dual afterglow emission characteristics of delayed fluorescence and phosphorescence.

[0058] Figure 8 This is the afterglow lifetime decay curve of the above-mentioned carbon dot-based afterglow material CDs@MgAl2O4 at excitation wavelengths of 277nm and 450nm, where λex refers to the excitation wavelength, λem refers to the emission wavelength, and τ refers to the decay time, i.e., the afterglow lifetime. Figure 8 a shows that the afterglow lifetime at an excitation wavelength of 277 nm is 17.8 ms; FIG. 78 shows that the afterglow lifetime at an excitation wavelength of 450 nm is 550 ms.

[0059] Example 2

[0060] A method for preparing a dual-mode ultra-wide emission range carbon dot-based afterglow material:

[0061] Step 1: Weigh 5 mg of 1,4,5,8-naphthalenetetracarboxylic acid, 203.3 mg of magnesium chloride hexahydrate, 482.88 mg of aluminum chloride hexahydrate, and 60 mg of urea and transfer them to a crucible. Add 4 ml of a 1:1 mixture of ethanol and water and sonicate for 5 minutes to dissolve all the solids.

[0062] In this step, Mg in magnesium salt 2+ and Al in the aluminum salt 3+ The molar ratio of carbon source precursor and Mg is 1:2; 2+ The molar ratio of urea and Mg is 0.02:1; 2+ The molar ratio is 1:1.

[0063] Step 2: The above solution was transferred to a muffle furnace, heated to 600° C. at a heating rate of 5° C. / min, and maintained for 2 h, after which a solid composite was obtained.

[0064] Step three: Grind the solid composite into solid powder using an agate mortar to prepare a carbon dot-based afterglow material with a dual-mode ultra-wide emission range.

[0065] Example 3

[0066] A method for preparing a dual-mode ultra-wide emission range carbon dot-based afterglow material:

[0067] Step 1: Weigh 27 mg of 1,4,5,8-naphthalenetetracarboxylic acid, 203.3 mg of magnesium chloride hexahydrate, 1448.6 mg of aluminum chloride hexahydrate, and 720.4 mg of urea and transfer them to a crucible. Add 4 ml of a 1:1 mixture of ethanol and water, and sonicate for 5 minutes to dissolve all the solids.

[0068] In this step, Mg in magnesium salt 2+ and Al in the aluminum salt 3+ The molar ratio of carbon source precursor and Mg is 1:6; 2+ The molar ratio of urea and Mg is 0.1:1; 2+ The molar ratio is 12:1.

[0069] Step 2: The above solution was transferred to a muffle furnace, heated to 700° C. at a heating rate of 5° C. / min, and maintained for 2 h, after which a solid composite was obtained.

[0070] Step three: Grind the solid composite into solid powder using an agate mortar to prepare a carbon dot-based afterglow material with a dual-mode ultra-wide emission range.

[0071] Example 4

[0072] A dual-mode ultra-wide emission range carbon dot-based afterglow material for anti-counterfeiting applications, such as Figure 9 As shown, the carbon dot-based afterglow material prepared in Example 1 is made into any pattern, such as the pattern "1 2 3". When excited by light sources with different excitation wavelengths, the afterglow shows different colors.

[0073] According to the above principle, carbon dot-based afterglow materials can be applied in the field of advanced anti-counterfeiting. In actual application, the carbon dot-based afterglow materials are printed on the outside of the product to form an anti-counterfeiting mark. The anti-counterfeiting mark is irradiated with lasers of different wavelengths for a certain period of time and then the laser is turned off. The afterglow color of the anti-counterfeiting mark is used to determine whether the product is genuine. If the afterglow color displayed after the laser is turned off is different from the color of the afterglow color displayed after the laser is turned off, the product is genuine. Figure 9 If the colors shown are consistent, the product is considered authentic.

[0074] The afterglow characteristics of the carbon dot-based afterglow material of the present application are used for advanced anti-counterfeiting identification. Different colors of afterglow correspond to excitation of different wavelengths. The anti-counterfeiting effect is real and reliable, and the operation is convenient.

[0075] Example 5

[0076] A dual-mode ultra-wide emission range carbon dot-based afterglow material in the field of optoelectronic devices, such as Figure 10As shown, the carbon dot-based afterglow material prepared in Example 1 is coated on a UV-LED chip (365nm) and a Blue-LED chip (450nm) to construct a delayed light-emitting diode, which will continue to emit afterglow for a period of time after the power is turned off. It is further applied to alarm lights such as temperature or pressure sensors to indicate abnormal conditions with delayed light emission, and fault records can be retained even when the main power is interrupted.

[0077] The preparation method, experimental scheme or detection method involved in the embodiments of the present invention, unless otherwise specified, are conventional schemes in the prior art, and their names and abbreviations all belong to conventional names in this area, and their uses are all very clear and definite in this area. The various instruments, equipment, raw materials or reagents used in the embodiments of this application do not have special properties in source, and are all conventional products that can be purchased through regular commercial channels. It should be pointed out that those skilled in the art can, without departing from the concept of the present invention, freely combine the technical features in the embodiments, and can also make some deformations and improvements, which all belong to the scope of protection of the present invention. Therefore, all equivalent transformations and modifications made with the scope of the claims of the present invention should all belong to the scope of coverage of the claims of the present invention.

Claims

1. A method for preparing a dual-mode ultra-wide emission range carbon dot-based afterglow material, characterized in that: The following steps are involved: Step 1: Dissolve the carbon source precursor, matrix precursor and combustion aid evenly in a mixed solution of deionized water and ethanol; Step 2: heating and calcining the solution obtained after dissolution to obtain a carbon dot-based afterglow material.

2. The method for preparing a dual-mode ultra-wide emission range carbon dot-based afterglow material according to claim 1, characterized in that: The carbon source precursor is an aromatic compound, and the aromatic compound includes at least one of benzamide, 1-naphthoic acid, 1,8-naphthalene dicarboxylic acid, terephthalic acid, 1,2,4,5-benzenetetracarboxylic acid, 1,4,5,8-naphthalenetetracarboxylic acid, and fluoranthene.

3. The method for preparing a dual-mode ultra-wide emission range carbon dot-based afterglow material according to claim 1, characterized in that: The matrix precursor includes magnesium salt and aluminum salt, wherein Mg 2+ and Al in the aluminum salt 3+ The molar ratio of the matrix precursor is 1: (2 to 6), and the matrix precursor generates a MgAl2O4 matrix after heating and calcining.

4. The method for preparing a dual-mode ultra-wide emission range carbon dot-based afterglow material according to claim 1, characterized in that: In step 2, the heating and calcining temperature is 550-700° C., and the heating and calcining time is 1-3 hours.

5. The method for preparing a dual-mode ultra-wide emission range carbon dot-based afterglow material according to claim 3, characterized in that: The magnesium salt includes one of magnesium chloride hexahydrate and magnesium nitrate hexahydrate; the aluminum salt includes one of aluminum chloride hexahydrate and aluminum nitrate nonahydrate.

6. The method for preparing a dual-mode ultra-wide emission range carbon dot-based afterglow material according to claim 3, characterized in that: The carbon source precursor and Mg 2+ The molar ratio is (0.003~0.1):

1.

7. The method for preparing a dual-mode ultra-wide emission range carbon dot-based afterglow material according to claim 3, characterized in that: The combustion aid is urea, and the urea and Mg 2+ The molar ratio is (1~12):

1.

8. A dual-mode ultra-wide emission range carbon dot-based afterglow material, characterized in that: It is prepared by the preparation method according to any one of claims 1 to 7.

9. Application of a dual-mode ultra-wide emission range carbon dot-based afterglow material, characterized in that: The carbon dot-based afterglow material described in claim 8 is used in the field of anti-counterfeiting.

10. Application of a dual-mode ultra-wide emission range carbon dot-based afterglow material, characterized in that: The carbon dot-based afterglow material described in claim 8 is used in the field of optoelectronic equipment.

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