Afterglow luminescent carbon quantum dot porous glass and preparation method thereof

Abstract

The invention provides afterglow luminescent carbon quantum dot porous glass and a preparation method thereof. The afterglow luminescent carbon quantum dot porous glass is silicate porous glass which is prepared by a sol-gel method and has high transmittance in a visible light range, and carbon quantum dots grow in pores of the silicate porous glass in situ along with decomposition of lactate radicals in a precursor aluminum lactate in a sintering process; triplet-state luminescence of the carbon quantum dots is stabilized through interaction between the glass and the carbon quantum dots, and afterglow luminescence of the carbon quantum dot porous glass is achieved; regulation and control on luminescence of the carbon quantum dot porous glass are realized by accurately adjusting the sintering temperature of the carbon quantum dot porous glass; benefited from the advantage that the glass prepared by a sol-gel method can realize molecular-level doping, the regulation and control on the luminescence of the carbon quantum dot porous glass can also be realized by doping metal ions such as Pb < 2 + > and Zn < 2 + > into the glass in situ. The carbon quantum dot porous glass prepared by the invention has excellent luminescence property, and has important application value in the field of photoelectric devices.

Description

Technical Field

[0001] The invention relates to afterglow luminescent carbon quantum dots, in particular to a carbon quantum dot porous glass with adjustable afterglow luminescence prepared by a sol-gel method. Background Art

[0002] Carbon quantum dots are a new type of zero-dimensional carbon-based nanomaterials with low toxicity, biocompatibility, and photocatalytic properties. In recent years, thanks to the special composition and structure of carbon dots, they have shown a series of novel optical properties such as phosphorescence, thermally activated delayed fluorescence, and other afterglow luminescence, which has made them a hot topic in many research directions such as anti-counterfeiting technology, information security encryption, and sensing technology. The afterglow luminescence of carbon quantum dots is a luminescence phenomenon caused by triplet electrons, but the triplet state of carbon quantum dots is very unstable.

[0003] A large number of studies have shown that confining carbon quantum dots in a rigid matrix can effectively stabilize their triplet state to achieve afterglow luminescence. For example, in situ growth of carbon quantum dots in zeolite can achieve afterglow luminescence, but the samples prepared by this method are in powder form, and we need to perform secondary processing for subsequent applications. And it is still challenging to regulate its luminescence in the matrix.

[0004] In response to the problems encountered, the inventors have developed a carbon quantum dot silicate optical porous glass with controllable afterglow luminescence synthesized by the sol-gel method. The silicate glass prepared by the sol-gel method not only has high transparency, excellent mechanical, chemical and heat resistance, but also has nanoscale pores. During the sintering process, the decomposition of organic matter in the precursor produces carbon quantum dots. The interaction between the glass matrix and the carbon quantum dots stabilizes the triplet luminescence of the carbon quantum dots, realizing the afterglow luminescence of the carbon quantum dot porous glass. The luminescence of the carbon quantum dot porous glass can be regulated by adjusting the sintering temperature of the carbon quantum dot porous glass; more importantly, by in-situ doping Pb in the glass 2+ The luminescence of carbon quantum dot porous glass is also regulated. This method has simple process and low cost. The prepared carbon quantum dot porous glass with afterglow luminescence has the characteristics of uniformity and adjustable luminescence, and has important applications in optoelectronic device fields such as anti-counterfeiting and imaging. Summary of the invention

[0005] The purpose of the present invention is to provide a controllable carbon quantum dot porous glass with afterglow luminescence prepared by a sol-gel method. The interaction between the carbon quantum dots and the glass matrix stabilizes the triplet state of the carbon quantum dots, thereby achieving afterglow luminescence. The luminescence of the carbon quantum dot porous glass can be regulated by adjusting the sintering temperature of the carbon quantum dot porous glass; more importantly, by in-situ doping Pb in the glass 2+ 、Zn 2+ The luminescence of carbon quantum dot porous glass can also be regulated.

[0006] The technical solution of the present invention is as follows:

[0007] A persistent luminescence carbon quantum dot porous glass with the structural formula of M-C-Al2O3-SiO2, where M is a metal atom, the porous glass is a silicate porous glass, the precursors include metal acetate, aluminum lactate and tetraethyl orthosilicate, and the molar ratio of the metal acetate, aluminum lactate and tetraethyl orthosilicate is x:y:(100-x-y) (where 0≤x≤10, 0<y≤25). The porous glass realizes the regulation of the luminescence of the carbon quantum dot porous glass by changing the sintering temperature.

[0008] The metal atom is Pb or Zn.

[0009] The above-mentioned persistent luminescence carbon quantum dot porous glass is prepared by the sol-gel method, which mainly includes the following steps:

[0010] S1: Using tetraethyl orthosilicate, aluminum lactate and metal acetate as precursors, and the molar ratio of the metal acetate, aluminum lactate and tetraethyl orthosilicate is x:y:(100-x-y) (where 0≤x≤10, 0<y≤25); water and ethanol as solvents; at room temperature, dissolve the precursor tetraethyl orthosilicate in the ethanol solvent, dissolve the precursors aluminum lactate and metal acetate in water respectively, stir evenly respectively, then mix and stir well again to obtain a uniform mixed solution;

[0011] S2: Transfer the mixed solution obtained in step S1 to a plastic mold and let it stand at room temperature for 6-18 h to obtain a silicate sol;

[0012] S3: Dry the silicate sol obtained in step S2 in an oven, and the drying temperature is 50-100 °C, that is, keep the temperature at 50, 60, 70, 80, 90, 100 °C in sequence, and finally cool to room temperature to obtain a silicate xerogel;

[0013] S4: Put the silicate xerogel obtained in step S3 into a crucible and sinter it in a muffle furnace. The sintering temperature range is 200-T °C (where 500 °C≤T≤600 °C). Gradually increase the temperature and keep the temperature at 200, 400 °C and the final sintering temperature T in sequence. Finally, cool to room temperature to obtain a transparent persistent luminescence carbon quantum dot silicate porous glass. By regulating T, the regulation of the persistent luminescence of the finally prepared glass is realized.

[0014] In step S1, the metal acetate in the precursor is lead acetate or zinc acetate.

[0015] The heat preservation operation in step S3 is a heat preservation time of 4 h.

[0016] In step S4, the gradual heating rate is 1°C / min, and the insulation operation is for 4 hours.

[0017] The metal acetate salt in the precursor in step S1 is lead acetate, the molar ratio of the precursors lead acetate, aluminum lactate and tetraethyl orthosilicate is 0.01:1:98.99, and the sintering temperature in step S4 is 500°C.

[0018] The metal acetate salt in the precursor in step S1 is zinc acetate, the molar ratio of the precursors zinc acetate, aluminum lactate and tetraethyl orthosilicate is 0.01:1:98.99, and the sintering temperature in step S4 is 500°C.

[0019] The metal acetate salt in the precursor in step S1 is lead acetate, the molar ratio of the precursors lead acetate, aluminum lactate and tetraethyl orthosilicate is 0.01:1:98.99, and the sintering temperature in step S4 is 600°C.

[0020] Compared with the prior art, the present invention has the following innovative features:

[0021] 1. The present invention uses the sol-gel method to successfully achieve in-situ growth of carbon quantum dots in silicate porous glass, and the afterglow luminescence of the sample is achieved thanks to the interaction between the carbon quantum dots and the glass matrix.

[0022] 2. The present invention achieves regulation of the luminescence of carbon quantum dot porous glass by adjusting the sintering temperature of the carbon quantum dot silicate porous glass.

[0023] 3. The present invention in situ doping metal ions such as Pb in silicate porous glass 2+ 、Zn 2+ Realize the regulation of luminescence of carbon quantum dot porous glass. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a photo of the carbon quantum dot porous glass prepared in Example 1 under a fluorescent light;

[0025] Figure 2 is the transmission spectrum of the carbon quantum dot porous glass prepared in Example 1;

[0026] Figure 3 This is the BET test spectrum of the carbon quantum dot porous glass prepared in Example 1;

[0027] Figure 4 The fluorescence spectrum of the carbon quantum dot porous glass prepared in Example 1 under 360nm excitation;

[0028] Figure 5 The phosphorescence spectrum of the carbon quantum dot porous glass prepared in Example 1 under 360nm excitation;

[0029] Figure 6 This is a photo of the carbon quantum dot porous glass prepared in Example 2 under a fluorescent light;

[0030] Figure 7 The fluorescence spectrum of the carbon quantum dot porous glass prepared in Example 2 under 360nm excitation;

[0031] Figure 8 The phosphorescence spectrum of the carbon quantum dot porous glass prepared in Example 2 under 360nm excitation;

[0032] Fig. 9 This is a photo of the carbon quantum dot porous glass prepared in Example 3 under a fluorescent light;

[0033] Fig.10 The fluorescence spectrum of the carbon quantum dot porous glass prepared in Example 3 under 360nm excitation;

[0034] Fig.11 The phosphorescence spectrum of the carbon quantum dot porous glass prepared in Example 3 under 360nm excitation;

[0035] Fig.12 The fluorescence spectrum of the carbon quantum dot porous glass prepared in Example 4 under 360nm excitation;

[0036] Fig.13 The phosphorescence spectrum of the carbon quantum dot porous glass prepared in Example 4 under 360nm excitation;

[0037] Fig.14 The fluorescence spectrum of the carbon quantum dot porous glass prepared in Example 5 under 360nm excitation;

[0038] Fig.15 This is the phosphorescence spectrum of the carbon quantum dot porous glass prepared in Example 5 under 360nm excitation. DETAILED DESCRIPTION

[0039] The present invention is further described below in conjunction with specific examples. It is necessary to point out that the examples are only used to further illustrate the present invention and cannot be construed as limiting the scope of the present invention. Those skilled in the art can make some non-essential improvements and adjustments based on the above content of the present invention. The test methods in the following examples that do not specify specific conditions are usually carried out under conventional conditions or under conditions recommended by the manufacturer.

[0040] The sources, names and specifications of the experimental materials or experimental instruments used in the embodiments of the present invention are shown in the following table:

[0041]

[0042] Table 1: List of experimental materials used in this invention

[0043] The present invention is further described below in conjunction with embodiments, but the protection scope of the present invention should not be limited thereto.

[0044]

[0045] Table 2: Statistics of luminescent wavelengths of samples of different types of carbon quantum dot porous glass

[0046] Embodiment 1:

[0047] The preparation method of Example 1 is as follows:

[0048] (1) Precursor preparation: At room temperature, 1.34 ml of tetraethyl orthosilicate (SiC8H 20 O4) was dissolved in ethanol solvent, 0.038g aluminum lactate (C9H 15 AlO9) is dissolved in water, stirred evenly, and then mixed; stirred evenly to obtain a mixed solution;

[0049] (2) Preparation of carbon quantum dot silicate porous glass: The mixed solution is transferred into a plastic mold and allowed to stand at room temperature for 6 hours to obtain a silicate sol; the silicate sol is placed in an oven for drying at a drying temperature of 50 to 100°C, and is kept at 50, 60, 70, 80, and 90°C for 4 hours, respectively, and finally kept at 100°C for 4 hours and then cooled to room temperature to obtain a silicate xerogel; the silicate xerogel is placed in a crucible and sintered in a muffle furnace at a sintering temperature range of 200 to 500°C and a heating rate of 1°C / min, and is kept at 200, 400, and 500°C for 4 hours, respectively, and finally cooled to room temperature to obtain a transparent carbon quantum dot silicate porous glass with afterglow luminescence.

[0050] Test Example 1: Transparency test of carbon quantum dot porous glass

[0051] Test sample: carbon quantum dot porous glass prepared in Example 1 Test equipment: UV-visible spectrophotometer (AMBDA 750, PerkinElmer, USA);

[0052] like Figure 2 As shown, in the 250-800 nm band, the transmittance of the carbon quantum dot porous glass prepared in Example 1 is about 94%, which meets the practical application of optical devices.

[0053] Test Example 2: Porous properties test of carbon quantum dot porous glass

[0054] Test sample: carbon quantum dot porous glass prepared in Example 1 Test equipment: nitrogen adsorption-desorption instrument (Autosorb iQ, Anton Paar, Austria);

[0055] like Figure 3 As shown, the transparent porous glass prepared in Example 1 has an average pore size of 1.1 nm obtained by fitting. Test Example 3: Fluorescence Photoluminescence Test of Carbon Quantum Dot Porous Glass

[0056] Test sample: Carbon quantum dot porous glass prepared in Example 1

[0057] Test equipment: Edinburgh fluorescence spectrometer (FLS1000); test range 400-800nm;

[0058] like Figure 4 As shown, the carbon quantum dot porous glass prepared in Example 1 emits fluorescence with a wavelength of 538 nm under 360 nm light excitation.

[0059] Test Example 4: Carbon quantum dot porous glass phosphorescence photoluminescence test

[0060] Test sample: Carbon quantum dot porous glass prepared in Example 1

[0061] Test equipment: Steady transient fluorescence spectrometer (HORIBA FluoroMax-4); test range 400-800nm;

[0062] like Figure 5 As shown, the carbon quantum dot porous glass prepared in Example 1 emits phosphorescence with a wavelength of 550nm under 360nm light excitation.

[0063] Embodiment 2:

[0064] The preparation method of Example 2 is as follows:

[0065] (1) Precursor preparation: At room temperature, 1.34 ml of tetraethyl orthosilicate (SiC8H 20 O4) was dissolved in ethanol solvent, 0.038g aluminum lactate (C9H 15 AlO9) is dissolved in water, stirred evenly, and then mixed; stirred evenly to obtain a mixed solution;

[0066] (2) Preparation of carbon quantum dot silicate porous glass: The mixed solution is transferred into a plastic mold and allowed to stand at room temperature for 12 hours to obtain a silicate sol; the silicate sol is placed in an oven for drying at a drying temperature of 50 to 100°C, and is kept at 50, 60, 70, 80, and 90°C for 4 hours, respectively, and finally kept at 100°C for 4 hours and then cooled to room temperature to obtain a silicate xerogel; the silicate xerogel is placed in a crucible and sintered in a muffle furnace at a sintering temperature range of 200 to 600°C and a heating rate of 1°C / min, and is kept at 200, 400, and 600°C for 4 hours, respectively, and finally cooled to room temperature to obtain a transparent carbon quantum dot silicate porous glass with afterglow luminescence.

[0067] Test Example 5: Fluorescence Photoluminescence Test of Carbon Quantum Dot Porous Glass

[0068] Test sample: Carbon quantum dot porous glass prepared in Example 2

[0069] Test equipment: Edinburgh fluorescence spectrometer (FLS1000); test range 400-800nm;

[0070] like Figure 7 As shown, the carbon quantum dot porous glass prepared in Example 2 emits fluorescence with a wavelength of 510 nm under 360 nm light excitation.

[0071] Test Example 6: Carbon quantum dot porous glass phosphorescence photoluminescence test

[0072] Test sample: Carbon quantum dot porous glass prepared in Example 2

[0073] Test equipment: Steady transient fluorescence spectrometer (HORIBA FluoroMax-4); test range 400-800nm;

[0074] like Figure 8 As shown, the carbon quantum dot porous glass prepared in Example 2 emits phosphorescence with a wavelength of 556 nm under 360 nm light excitation.

[0075] Embodiment 3:

[0076] The preparation method of Example 3 is as follows:

[0077] (1) Precursor preparation: At room temperature, 1.34 ml of tetraethyl orthosilicate (SiC8H 20 O4) was dissolved in ethanol solvent, 0.038g aluminum lactate (C9H 15 AlO9) is dissolved in water, 0.023g of lead acetate (PbC4H6O4) is dissolved in 100ml of water and then 1ml is taken, stirred evenly respectively, and then mixed; stirred evenly to obtain a mixed solution;

[0078] (2) Preparation of carbon quantum dot silicate porous glass: The mixed solution is transferred into a plastic mold and allowed to stand at room temperature for 18 hours to obtain a silicate sol; the silicate sol is placed in an oven for drying at a drying temperature of 50 to 100°C, and is kept at 50, 60, 70, 80, and 90°C for 4 hours, respectively, and finally kept at 100°C for 4 hours and then cooled to room temperature to obtain a silicate xerogel; the silicate xerogel is placed in a crucible and sintered in a muffle furnace at a sintering temperature range of 200 to 500°C and a heating rate of 1°C / min, and is kept at 200, 400, and 500°C for 4 hours, respectively, and finally cooled to room temperature to obtain a transparent carbon quantum dot silicate porous glass with afterglow luminescence.

[0079] Test Example 7: Carbon quantum dot porous glass fluorescence photoluminescence test

[0080] Test sample: Carbon quantum dot porous glass prepared in Example 3

[0081] Test equipment: Edinburgh fluorescence spectrometer (FLS1000); test range 400-800nm;

[0082] like Fig.10 As shown, the carbon quantum dot porous glass prepared in Example 3 emits fluorescence with a wavelength of 500nm under 360nm light excitation.

[0083] Test Example 8: Carbon quantum dot porous glass phosphorescence photoluminescence test

[0084] Test sample: Carbon quantum dot porous glass prepared in Example 3

[0085] Test equipment: Steady transient fluorescence spectrometer (HORIBA FluoroMax-4); test range 400-800nm;

[0086] like Fig.11 As shown, the carbon quantum dot porous glass prepared in Example 3 emits phosphorescence with a wavelength of 550nm under 360nm light excitation.

[0087] Embodiment 4:

[0088] The preparation method of Example 4 is as follows:

[0089] (1) Precursor preparation: At room temperature, 1.34 ml of tetraethyl orthosilicate (SiC8H 20 O4) was dissolved in ethanol solvent, 0.038g aluminum lactate (C9H 15 AlO9) is dissolved in water, 0.012g of lead acetate (ZnC4H6O4) is dissolved in 100ml of water and then 1ml is taken, stirred evenly respectively, and then mixed; stirred evenly to obtain a mixed solution;

[0090] (2) Preparation of carbon quantum dot silicate porous glass: The mixed solution is transferred into a plastic mold and allowed to stand at room temperature for 12 hours to obtain a silicate sol; the silicate sol is placed in an oven for drying at a drying temperature of 50 to 100°C, and is kept at 50, 60, 70, 80, and 90°C for 4 hours, respectively, and finally kept at 100°C for 4 hours and then cooled to room temperature to obtain a silicate xerogel; the silicate xerogel is placed in a crucible and sintered in a muffle furnace at a sintering temperature range of 200 to 500°C and a heating rate of 1°C / min, and is kept at 200, 400, and 500°C for 4 hours, respectively, and finally cooled to room temperature to obtain a transparent carbon quantum dot silicate porous glass with afterglow luminescence.

[0091] Test Example 9: Carbon quantum dot porous glass fluorescence photoluminescence test

[0092] Test sample: Carbon quantum dot porous glass prepared in Example 4

[0093] Test equipment: Edinburgh fluorescence spectrometer (FLS1000); test range 400-650nm;

[0094] like Fig.12 As shown, the carbon quantum dot porous glass prepared in Example 4 emits fluorescence with a wavelength of 515 nm under 360 nm light excitation.

[0095] Test Example 10: Carbon quantum dot porous glass phosphorescence photoluminescence test

[0096] Test sample: Carbon quantum dot porous glass prepared in Example 4

[0097] Test equipment: Steady transient fluorescence spectrometer (HORIBA FluoroMax-4); test range 400-800nm;

[0098] like Fig.13 As shown, the carbon quantum dot porous glass prepared in Example 4 emits phosphorescence with a wavelength of 540 nm under 360 nm light excitation.

[0099] Embodiment 5:

[0100] The preparation method of Example 5 is as follows:

[0101] (1) Precursor preparation: At room temperature, 1.34 ml of tetraethyl orthosilicate (SiC8H 20 O4) was dissolved in ethanol solvent, 0.038g aluminum lactate (C9H 15 AlO9) is dissolved in water, 0.023g of lead acetate (PbC4H6O4) is dissolved in 100ml of water and then 1ml is taken, stirred evenly respectively, and then mixed; stirred evenly to obtain a mixed solution;

[0102] (2) Preparation of carbon quantum dot silicate porous glass: The mixed solution is transferred into a plastic mold and allowed to stand at room temperature for 12 hours to obtain a silicate sol; the silicate sol is placed in an oven for drying at a drying temperature of 50 to 100°C, and is kept at 50, 60, 70, 80, and 90°C for 4 hours, respectively, and finally kept at 100°C for 4 hours and then cooled to room temperature to obtain a silicate xerogel; the silicate xerogel is placed in a crucible and sintered in a muffle furnace at a sintering temperature range of 200 to 600°C and a heating rate of 1°C / min, and is kept at 200, 400, and 600°C for 4 hours, respectively, and finally cooled to room temperature to obtain a transparent carbon quantum dot silicate porous glass with afterglow luminescence.

[0103] Test Example 11: Carbon quantum dot porous glass fluorescence photoluminescence test

[0104] Test sample: Carbon quantum dot porous glass prepared in Example 5

[0105] Test equipment: Edinburgh fluorescence spectrometer (FLS1000); test range 400-800nm;

[0106] like Fig.14 As shown, the carbon quantum dot porous glass prepared in Example 3 emits fluorescence with a wavelength of 508 nm under 360 nm light excitation.

[0107] Test Example 12: Carbon quantum dot porous glass phosphorescence photoluminescence test

[0108] Test sample: Carbon quantum dot porous glass prepared in Example 5

[0109] Test equipment: Steady transient fluorescence spectrometer (HORIBA FluoroMax-4); test range 400-800nm;

[0110] like Fig.15 As shown, the carbon quantum dot porous glass prepared in Example 3 emits phosphorescence with a wavelength of 545 nm under 360 nm light excitation.

Claims

1. A kind of afterglow luminescent carbon quantum dot porous glass, characterized in that: The structural formula is M-C-Al2O3-SiO2, where M is a metal atom, and the porous glass is silicate porous glass. The preparation precursor includes metal acetate, aluminum lactate, and tetraethyl orthosilicate. The molar ratio of the metal acetate, aluminum lactate, and tetraethyl orthosilicate is x:y:(100 - x - y) (where 0 ≤ x ≤ 10, 0 < y ≤ 25). The porous glass realizes the regulation of the luminescence of carbon quantum dot porous glass by changing the sintering temperature.

2. The afterglow luminescent carbon quantum dot porous glass according to claim 1, characterized in that: The metal atom is Pb or Zn.

3. The method for preparing a porous glass of afterglow luminescent carbon quantum dots according to claim 1 or 2, characterized in that: This method mainly prepares silicate porous glass by the sol-gel method. The specific steps are as follows: S1: Using tetraethyl orthosilicate, aluminum lactate, and metal acetate as precursors, the molar ratio of the metal acetate, aluminum lactate, and tetraethyl orthosilicate is x:y:(100 - x - y) (where 0 ≤ x ≤ 10, 0 < y ≤ 25); water and ethanol are solvents; at room temperature, dissolve the precursor tetraethyl orthosilicate in the ethanol solvent, dissolve the precursors aluminum lactate and metal acetate in water respectively, stir evenly respectively, then mix, and stir well again to obtain a uniform mixed solution; S2: Transfer the mixed solution obtained in step S1 to a plastic mold and let it stand at room temperature for 6 - 18 h to obtain a silicate sol; S3: Put the silicate sol obtained in step S2 into an oven for drying, and the drying temperature is 50 - 100 °C, that is, keep warm at 50, 60, 70, 80, 90, and 100 °C in sequence, and finally cool to room temperature to obtain a silicate xerogel; S4: Put the silicate xerogel obtained in step S3 into a crucible and sinter it in a muffle furnace. The sintering temperature range is 200 - T °C (where 500 °C ≤ T ≤ 600 °C). Gradually increase the temperature, keep warm at 200, 400 °C, and the final sintering temperature T in sequence, and finally cool to room temperature to obtain a transparent carbon quantum dot silicate porous glass with afterglow luminescence. By regulating T, the regulation of the afterglow luminescence of the finally prepared glass is realized.

4. The method for preparing a porous glass of afterglow luminescent carbon quantum dots according to claim 3, characterized in that: In step S1, the metal acetate in the precursor is lead acetate or zinc acetate.

5. The method for preparing a porous glass of afterglow luminescent carbon quantum dots according to claim 3, characterized in that: The heat preservation operation in step S3 is a heat preservation time of 4 h.

6. The method for preparing a porous glass of afterglow luminescent carbon quantum dots according to claim 3, characterized in that: In step S4, the heating rate is 1 °C / min, and the heat preservation operation is a heat preservation time of 4 h.

7. The method for preparing a porous glass of afterglow luminescent carbon quantum dots according to claim 4, characterized in that: In step S1, the metal acetate in the precursor is lead acetate, and the molar ratio of the precursor lead acetate, aluminum lactate, and tetraethyl orthosilicate is 0.01:1:98.

99. The sintering temperature in step S4 is 500 °C.

8. The method for preparing a porous glass of afterglow luminescent carbon quantum dots according to claim 4, characterized in that: In step S1, the metal acetate in the precursor is zinc acetate, and the molar ratio of the precursor zinc acetate, aluminum lactate, and tetraethyl orthosilicate is 0.01:1:98.

99. The sintering temperature in step S4 is 500 °C.

9. The method for preparing a porous glass of afterglow luminescent carbon quantum dots according to claim 4, characterized in that: In step S1, the metal acetate in the precursor is lead acetate, and the molar ratio of the precursor lead acetate, aluminum lactate, and tetraethyl orthosilicate is 0.01:1:98.

99. The sintering temperature in step S4 is 600 °C.

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