A dynamic long afterglow emission material and its preparation method and application

Abstract

The present invention relates to the technical field of afterglow emission material preparation, and in particular to a dynamic long afterglow emission material, a preparation method thereof, and an application thereof. The dynamic long afterglow emission material is prepared from a rosin compound, an amine reagent, boric acid, and water, wherein the mass of the rosin compound, the volume of the amine reagent, the mass of the boric acid, and the volume ratio of water are 0.1-2 g:0.1-2.5 mL:1-6 g:70 mL. The present invention uses rosin compounds to control and prepare a dynamic afterglow emission material, which, after being excited by a 254 nm monochromatic light source, can change its emission color from short-wave light (blue) to long-wave light (cyan) as time goes on when the light source is turned off, and the afterglow color also changes from blue to yellow as the wavelength of the excitation light source is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of afterglow emission material preparation, in particular to a dynamic long afterglow emission material and a preparation method and application thereof. Background Art

[0002] Afterglow emitting materials, characterized by long emission durations and large Stokes shifts, are used in fields such as anti-counterfeiting and cell imaging. Currently, three main types of afterglow emission phenomena exist for these materials: first, after excitation with a single light source, the afterglow color is a single color; second, after excitation with a single light source, the afterglow color shifts from long-wavelength to short-wavelength over time; and third, after excitation with different light sources, the afterglow emission color exhibits a dependent long-wavelength afterglow color. However, the phenomenon of dynamic afterglow emission, where the afterglow emission color shifts from short-wavelength to long-wavelength over time after excitation with a monochromatic light source, has not been reported.

[0003] Rosin compounds are a key resource for forest products in my country. Due to their abundant resources and high renewability, their processed products are widely studied and applied. Currently, research into the photoluminescence properties of rosin derivatives has been gradually developed, based on their structural characteristics, such as the conjugated system and the steric hindrance of the tricyclic phenanthrene molecule. However, research into their optical properties has primarily focused on fluorescence emission, and studies on their use in long-lasting emission materials have been lacking.

[0004] In summary, in order to break through the dynamic long afterglow color, in which the afterglow color changes from short-wavelength light color to long-wavelength light color over time after being excited by a monochromatic light source, and to develop research on deep-processing products of rosin-based resources in the field of long afterglow emission, a study was carried out starting with rosin-based resources and aiming to obtain dynamic long afterglow emission materials. Summary of the Invention

[0005] In order to solve the above problems, the present invention provides a dynamic long afterglow emission material and its preparation method and application. The dynamic long afterglow emission material provided by the present invention changes its afterglow color from short-wave light to long-wavelength light after being excited by a monochromatic light source (254nm).

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a dynamic long afterglow emission material, which is prepared from a rosin compound, an amine reagent, boric acid and water, wherein the mass ratio of the rosin compound, the volume of the amine reagent, the mass of the boric acid and the volume of water is 0.1-2g:0.1-2.5mL:1-6g:70mL;

[0008] The rosin compounds include one or more of rosin, hydrogenated rosin and dehydrogenated rosin.

[0009] Preferably, the amine reagent includes one or more of ethylenediamine and propylenediamine.

[0010] Preferably, the ratio of the mass of the rosin compound, the volume of the amine reagent, the mass of the boric acid and the volume of water is 0.3-1.5 g:0.2-1.5 mL:2-5 g:70 mL.

[0011] Preferably, the ratio of the mass of the rosin compound, the volume of the amine reagent, the mass of the boric acid and the volume of water is 0.4-1 g:0.5-1 mL:3-4.5 g:70 mL.

[0012] The present invention also provides a method for preparing the dynamic long afterglow emission material described in the above technical solution, comprising the following steps:

[0013] mixing the rosin compound, amine reagent, boric acid and water to obtain a mixture;

[0014] The obtained mixture is subjected to a hydrothermal reaction to obtain a dynamic long afterglow emission material.

[0015] Preferably, the conditions of the hydrothermal reaction include: temperature of 170-240° C. and time of 2-72 h.

[0016] Preferably, the hydrothermal reaction further includes filtration and freeze-drying to obtain a dynamic long afterglow emission material.

[0017] The present invention also provides the application of the dynamic long afterglow emission material described in the above technical solution in any one of dynamic color-changing anti-counterfeiting, ink, WLED and 3D materials.

[0018] The present invention also provides the application of the dynamic long afterglow emission material described in the above technical solution in the conversion from short-wavelength light to long-wavelength light.

[0019] Preferably, the application includes: irradiating the dynamic long afterglow emission material with a light source having a wavelength of 254 to 420 nm.

[0020] In the present invention, the dehydrogenated rosin is dehydroabietic acid.

[0021] The beneficial effects of the present invention are:

[0022] The present invention addresses the shortcomings of afterglow materials, such as dynamic color-changing afterglow when excited by multiple light sources or a shift from long-wavelength to short-wavelength afterglow emission when excited by a single light source. By using rosin-based compounds, a dynamic afterglow emitting material is prepared. After excitation by a 254nm monochromatic light source, the material's emission color changes from short-wavelength light (blue) to long-wavelength light (cyan) over time when the light source is turned off. Furthermore, the afterglow color also shifts from blue to yellow as the wavelength of the excitation light source increases. This material exhibits dynamic color-changing properties both when excited by a monochromatic light source and when excited by multiple light sources. It can be used in fields such as dynamic color-changing anti-counterfeiting, inks, 3D materials, and WLEDs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below.

[0024] Figure 1 This is the afterglow emission diagram of the dynamic long afterglow emission material prepared in Example 5 after being excited by a 254nm light source. After being irradiated with 254nm violet light and the light source turned off, the afterglow color gradually changes from blue to cyan, realizing the transition from short-wavelength light color to long-wavelength light color, and the afterglow time can reach 16s;

[0025] Figure 2 The afterglow emission photos of the dynamic long afterglow emission material prepared in Example 5 after being excited by different light sources. When irradiated by light sources of different wavelengths (365nm, 405nm, and 420nm), the afterglow colors after the light source is turned off are green, yellow-green, and yellow, respectively, achieving dynamic color changes after excitation by different light sources, and the afterglow times can reach 22s, 16s, and 12s, respectively;

[0026] Figure 3 Afterglow emission graphs of 10 afterglow emission materials prepared from different compounds after turning off the 254nm light source;

[0027] Figure 4 , a is the words "Northeast Forestry University" spelled out using the powder prepared in Example 5. After the 254nm light source is turned off, it can be clearly observed that the afterglow color changes from blue to cyan. b is the "QR code" pattern printed using Example 5 as ink. After the 254nm light source is turned off, it can be clearly observed that the afterglow color changes from blue to cyan. DETAILED DESCRIPTION

[0028] The present invention provides a dynamic long-afterglow emission material prepared from a rosin compound, an amine reagent, boric acid, and water. The ratio of the mass of the rosin compound, the volume of the amine reagent, the mass of the boric acid, and the volume of the water is 0.1-2 g:0.1-2.5 mL:1-6 g:70 mL. The rosin compound includes one or more of rosin, hydrogenated rosin, and dehydrogenated rosin. In the present invention, the ratio of the mass of the rosin compound, the volume of the amine reagent, the mass of the boric acid, and the volume of the water is preferably 0.3-1.5 g:0.2-1.5 mL:2-5 g:70 mL. In the present invention, the ratio of the mass of the rosin compound, the volume of the amine reagent, the mass of the boric acid, and the volume of the water is preferably 0.4-1 g:0.5-1 mL:3-4.5 g:70 mL. The present invention does not particularly limit the source of the rosin compound; commercially available materials can be used.

[0029] In the present invention, the amine reagent preferably includes one or more of ethylenediamine and propylenediamine. The amine reagent serves to passivate the rosin-based compounds and introduce nitrogen into the material system, achieving nitrogen doping. During the high-temperature hydrothermal process, the boric acid decomposes to produce B2O3, which serves as a tempering confinement agent. More simply, the B2O3 produced by the thermal decomposition of boric acid can serve as a reaction product between the matrix-tempered confined rosin and the amine reagent, thereby promoting long-lasting emission.

[0030] The present invention also provides a method for preparing the dynamic long afterglow emission material described in the above technical solution, comprising the following steps:

[0031] mixing the rosin compound, amine reagent, boric acid and water to obtain a mixture;

[0032] The obtained mixture is subjected to a hydrothermal reaction to obtain a dynamic long afterglow emission material.

[0033] In the present invention, the conditions for the hydrothermal reaction preferably include: a temperature of 170-240°C and a time of 2-72 hours. In the present invention, the conditions for the hydrothermal reaction preferably include: a temperature of 180-220°C and a time of 4-48 hours. In the present invention, the hydrothermal reaction preferably also includes filtration and freeze-drying to obtain a dynamic long-afterglow emission material. In the present invention, the filtration uses filter paper or a water-based filter membrane. The present invention does not specifically limit the freeze-drying conditions, and those skilled in the art can follow conventional methods.

[0034] The present invention also provides the application of the dynamic long afterglow emission material described in the above technical solution in any one of dynamic color-changing anti-counterfeiting, ink, WLED and 3D materials.

[0035] The present invention also provides the application of the dynamic long afterglow emission material described in the above technical solution in the conversion from short-wavelength light to long-wavelength light.

[0036] In the present invention, the application preferably includes: irradiating the dynamic long afterglow emitting material with a light source having a wavelength of 254nm. The present invention does not specifically limit the irradiation time of the light source. In the present invention, when a light source having a wavelength of 254nm is used to irradiate the dynamic long afterglow emitting material, the instantaneous afterglow color after the light source is turned off is blue. When a light source having a wavelength of 365nm is used to irradiate the dynamic long afterglow emitting material, the instantaneous afterglow color after the light source is turned off is green; when a light source having a wavelength of 405nm is used to irradiate the dynamic long afterglow emitting material, the instantaneous afterglow color after the light source is turned off is yellow-green; when a light source having a wavelength of 420nm is used to irradiate the dynamic long afterglow emitting material, the instantaneous afterglow color after the light source is turned off is yellow.

[0037] In order to further illustrate the present invention, the present invention is described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0038] Example 1

[0039] 0.1g of rosin, 0.1mL of ethylenediamine, and 1g of boric acid were placed in a 100mL hydrothermal autoclave, added to 70mL of deionized water, and stirred to mix thoroughly. The mixture was then hydrothermally reacted at 170°C for 72 hours, naturally cooled, filtered, and freeze-dried to obtain an afterglow material powder. When the powder was irradiated with a 254nm light source, the afterglow color changed from blue to cyan over a period of approximately 2 seconds after the light was turned off, and then remained cyan until the afterglow disappeared.

[0040] Example 2

[0041] 2g of rosin, 2.5mL of ethylenediamine, and 6g of boric acid were placed in a 100mL hydrothermal autoclave, then added to 70mL of deionized water and stirred to mix thoroughly. The mixture was then hydrothermally reacted at 240°C for 2h, naturally cooled, filtered, and freeze-dried to obtain an afterglow material powder. When the powder was irradiated with a 254nm light source, the afterglow color changed from blue to cyan over a period of approximately 2s after the light was turned off. The cyan afterglow remained until the afterglow disappeared.

[0042] Example 3

[0043] 0.8g of rosin, 1mL of ethylenediamine, and 4g of boric acid were placed in a 100mL hydrothermal autoclave, added to 70mL of deionized water, and stirred to mix thoroughly. The mixture was then hydrothermally reacted at 220°C for 24 hours, naturally cooled, filtered, and freeze-dried to obtain an afterglow material powder. When the powder was irradiated with a 254nm light source, the afterglow color changed from blue to cyan over a period of approximately 2 seconds after the light was turned off, and then remained cyan until the afterglow disappeared.

[0044] Example 4

[0045] 1g of rosin, 1mL of ethylenediamine, and 4.5g of boric acid were placed in a 100mL hydrothermal autoclave, then added to 70mL of deionized water and stirred to mix thoroughly. The mixture was then hydrothermally reacted at 180°C for 48 hours, naturally cooled, filtered, and freeze-dried to obtain an afterglow material powder. When the powder was irradiated with a 254nm light source, the afterglow color changed from blue to cyan over a period of approximately 2 seconds after the light was turned off, and then remained cyan until the afterglow disappeared.

[0046] Example 5

[0047] 0.4g of rosin, 0.5mL of ethylenediamine, and 3g of boric acid were placed in a 100mL hydrothermal autoclave, then added to 70mL of deionized water and stirred to mix thoroughly. The mixture was then hydrothermally reacted at 200°C for 36 hours. The mixture was then naturally cooled, filtered, and freeze-dried to obtain an afterglow material powder. When the powder was irradiated with a 254nm light source, the afterglow color changed from blue to cyan over a period of approximately 2 seconds after the light was turned off. The cyan afterglow remained until the afterglow disappeared.

[0048] Example 6

[0049] 0.4g of hydrogenated rosin, 0.5mL of ethylenediamine, and 3g of boric acid were placed in a 100mL hydrothermal autoclave, then added to 70mL of deionized water and stirred until thoroughly mixed. The mixture was then hydrothermally reacted at 200°C for 36 hours. The mixture was then naturally cooled, filtered, and freeze-dried to obtain an afterglow material powder. When the powder was irradiated with a 254nm light source, the afterglow color changed from blue to cyan over a period of approximately 2 seconds after the light was turned off. The cyan afterglow remained until the afterglow disappeared.

[0050] Example 7

[0051] 0.4g of dehydrogenated rosin, 0.5mL of ethylenediamine, and 3g of boric acid were placed in a 100mL hydrothermal autoclave, added to 70mL of deionized water, and stirred to mix thoroughly. The mixture was then hydrothermally reacted at 200°C for 36 hours, naturally cooled, filtered, and freeze-dried to obtain an afterglow material powder. When the powder was irradiated with a 254nm light source and the light was turned off, the afterglow color changed from blue to cyan over a 2s period, then remained cyan-green until the afterglow disappeared.

[0052] Example 8

[0053] 0.5g of rosin, 0.2mL of propylenediamine, and 2g of boric acid were placed in a 100mL hydrothermal autoclave, added to 70mL of deionized water, and stirred to mix thoroughly. The mixture was then hydrothermally reacted at 180°C for 48 hours, naturally cooled, filtered, and freeze-dried to obtain an afterglow material powder. When the powder was irradiated with a 254nm light source, the afterglow color changed from blue to cyan over a period of approximately 2 seconds after the light was turned off, and then remained cyan until the afterglow disappeared.

[0054] Example 9

[0055] 2g of rosin, 1.5mL of propylenediamine, and 4.5g of boric acid were placed in a 100mL hydrothermal autoclave, added to 70mL of deionized water, and stirred to mix thoroughly. The mixture was then hydrothermally reacted at 240°C for 12 hours, naturally cooled, filtered, and freeze-dried to obtain an afterglow material powder. When the powder was irradiated with a 254nm light source, the afterglow color changed from blue to cyan over a period of approximately 2 seconds after the light was turned off, and then remained cyan until the afterglow disappeared.

[0056] Example 10

[0057] 0.7g of rosin, 1mL of propylenediamine, and 4g of boric acid were placed in a 100mL hydrothermal autoclave, then added to 70mL of deionized water and stirred to mix thoroughly. The mixture was then hydrothermally reacted at 220°C for 36 hours. The mixture was then naturally cooled, filtered, and freeze-dried to obtain an afterglow material powder. When the powder was irradiated with a 254nm light source, the afterglow color changed from blue to cyan over a period of approximately 2 seconds after the light was turned off. The cyan afterglow remained until the afterglow disappeared.

[0058] Example 11

[0059] 0.1g of rosin, 0.2mL of propylenediamine, and 1g of boric acid were placed in a 100mL hydrothermal autoclave, added to 70mL of deionized water, and stirred to mix thoroughly. The mixture was then hydrothermally reacted at 170°C for 72 hours. The mixture was then naturally cooled, filtered, and freeze-dried to obtain an afterglow material powder. After excitation with a 254nm light source, the afterglow color of the powder changed from blue to cyan over a period of approximately 2 seconds, and then remained cyan until the afterglow disappeared.

[0060] Example 12

[0061] 0.4g of rosin, 0.5mL of propylenediamine, and 3g of boric acid were placed in a 100mL hydrothermal autoclave, added to 70mL of deionized water, and stirred until thoroughly mixed. The mixture was hydrothermally reacted at 200°C for 5 hours, naturally cooled, filtered, and freeze-dried to obtain an afterglow material powder. When the powder was irradiated with a 254nm light source, the afterglow color changed from blue to cyan over a period of approximately 2 seconds after the light was turned off, and then remained cyan until the afterglow disappeared.

[0062] Example 13

[0063] 0.4g of hydrogenated rosin, 0.5mL of propylenediamine, and 3g of boric acid were placed in a 100mL hydrothermal autoclave, added to 70mL of deionized water, and stirred until thoroughly mixed. The mixture was hydrothermally reacted at 200°C for 5h, naturally cooled, filtered, and freeze-dried to obtain an afterglow material powder. When the powder was irradiated with a 254nm light source, the afterglow color changed from blue to cyan over a period of approximately 2s after the light was turned off, and then remained cyan until the afterglow disappeared.

[0064] Example 14

[0065] 0.4g of dehydrogenated rosin, 0.5mL of propylenediamine, and 3g of boric acid were placed in a 100mL hydrothermal autoclave, added to 70mL of deionized water, and stirred to mix thoroughly. The mixture was then hydrothermally reacted at 200°C for 5h, naturally cooled, filtered, and freeze-dried to obtain an afterglow material powder. When the powder was irradiated with a 254nm light source and the light was turned off, the afterglow color changed from blue to cyan over a 2s period, then remained cyan-green until the afterglow disappeared.

[0066] Example 15

[0067] 0.6g of rosin, 0.5mL of propylenediamine, and 3g of boric acid were placed in a 100mL hydrothermal autoclave, added to 70mL of deionized water, and stirred to mix thoroughly. The mixture was then hydrothermally reacted at 200°C for 5 hours, naturally cooled, filtered, and freeze-dried to obtain an afterglow material powder. When the powder was irradiated with a 254nm light source and the light was turned off, the afterglow color changed from blue to cyan over a 2s period, then remained cyan until the afterglow disappeared.

[0068] Example 16

[0069] 0.4g of rosin, 0.5mL of propylenediamine, and 3g of boric acid were placed in a 100mL hydrothermal autoclave, added to 70mL of deionized water, and stirred to mix thoroughly. The mixture was then hydrothermally reacted at 240°C for 5 hours, naturally cooled, filtered, and freeze-dried to obtain an afterglow material powder. When the powder was irradiated with a 254nm light source and the light was turned off, the afterglow color changed from blue to cyan over a 2s period, then remained cyan-green until the afterglow disappeared.

[0070] Example 17

[0071] 0.4g of rosin, 0.5mL of propylenediamine, and 3g of boric acid were placed in a 100mL hydrothermal autoclave, added to 70mL of deionized water, and stirred to mix thoroughly. The mixture was then hydrothermally reacted at 200°C for 36 hours, naturally cooled, filtered, and freeze-dried to obtain an afterglow material powder. When the powder was irradiated with a 254nm light source and the light was turned off, the afterglow color changed from blue to cyan over a 2s period, then remained cyan-green until the afterglow disappeared.

[0072] Example 18

[0073] 0.6g of rosin, 0.5mL of ethylenediamine, and 3g of boric acid were placed in a 100mL hydrothermal autoclave, added to 70mL of deionized water, and stirred to mix thoroughly. The mixture was then hydrothermally reacted at 200°C for 36 hours, naturally cooled, filtered, and freeze-dried to obtain an afterglow material powder. When the powder was irradiated with a 254nm light source and the light was turned off, the afterglow color changed from blue to cyan over a 2s period, then remained cyan-green until the afterglow disappeared.

[0074] Example 19

[0075] 2g of rosin, 2.5mL of propylenediamine, and 6g of boric acid were placed in a 100mL hydrothermal autoclave, then added to 70mL of deionized water and stirred to mix thoroughly. The mixture was then hydrothermally reacted at 200°C for 36 hours. The mixture was then naturally cooled, filtered, and freeze-dried to obtain an afterglow material powder. When the powder was irradiated with a 254nm light source, the afterglow color changed from blue to cyan over a period of approximately 2 seconds after the light was turned off. The cyan afterglow remained until the afterglow disappeared.

[0076] Example 20

[0077] 0.4g of rosin, 0.5mL of ethylenediamine, and 3g of boric acid were placed in a 100mL hydrothermal autoclave, added to 70mL of deionized water, and stirred to mix thoroughly. The mixture was then hydrothermally reacted at 220°C for 36 hours, naturally cooled, filtered, and freeze-dried to obtain an afterglow material powder. When the powder was irradiated with a 254nm light source and the light was turned off, the afterglow color changed from blue to cyan over a 2s period, then remained cyan until the afterglow disappeared.

[0078] Example 21

[0079] 0.4g of rosin, 0.5mL of ethylenediamine, and 3g of boric acid were placed in a 100mL hydrothermal autoclave, added to 70mL of deionized water, and stirred to mix thoroughly. The mixture was then hydrothermally reacted at 200°C for 72 hours, naturally cooled, filtered, and freeze-dried to obtain an afterglow material powder. When the powder was irradiated with a 254nm light source and the light was turned off, the afterglow color changed from blue to cyan over a 2s period, then remained cyan-green until the afterglow disappeared.

[0080] Comparative Example 1

[0081] The preparation method of Example 5 was adopted, and the rosin was replaced by citric acid, sodium carboxymethyl cellulose, sodium alginate, enzymatic lignin, alkali lignin, sodium lignin sulfonate, calcium lignin sulfonate and sulfate lignin, respectively, while the other parameters remained unchanged, to prepare afterglow materials.

[0082] Comparative Example 2

[0083] The afterglow material was prepared by the preparation method of Example 5, without adding rosin and keeping other conditions unchanged.

[0084] Comparative Example 3

[0085] The afterglow material was prepared by the preparation method of Example 5, except that the rosin and ethylenediamine reagent were not added and other conditions remained unchanged.

[0086] from Figure 3 As can be seen, the eight comparative materials prepared using citric acid and other biomass compounds did not exhibit dynamic afterglow color change from short-wavelength light to long-wavelength light under 254nm excitation. The afterglow materials prepared in Comparative Examples 2 and 3 also did not exhibit dynamic afterglow color change from short-wavelength light to long-wavelength light under 254nm excitation.

[0087] Although the above embodiment provides a detailed description of the present invention, it is only a part of the embodiments of the present invention, not all of the embodiments. People can also obtain other embodiments based on this embodiment without creativity, and these embodiments all fall within the scope of protection of the present invention.

Claims

1. A dynamic long afterglow emission material, characterized in that: The product is prepared by hydrothermal reaction of rosin compounds, amine reagents, boric acid and water, wherein the mass ratio of the rosin compounds, the volume of the amine reagents, the mass of the boric acid and the volume of water is 0.1-2 g:0.1-2.5 mL:1-6 g:70 mL; The rosin compound includes one or more of rosin, hydrogenated rosin and dehydrogenated rosin; The amine reagent includes one or more of ethylenediamine and propylenediamine.

2. The dynamic long afterglow emission material according to claim 1, characterized in that: The ratio of the mass of the rosin compound, the volume of the amine reagent, the mass of the boric acid and the volume of water is 0.3-1.5 g:0.2-1.5 mL:2-5 g:70 mL.

3. The dynamic long afterglow emission material according to claim 1, characterized in that: The mass of the rosin compound, the volume of the amine reagent, the mass of the boric acid and the volume of water are in the ratio of 0.4-1 g: 0.5-1 mL: 3-4.5 g: 70 mL.

4. A method for preparing the dynamic long afterglow emission material according to any one of claims 1 to 3, characterized in that: The following steps are involved: mixing the rosin compound, amine reagent, boric acid and water to obtain a mixture; The obtained mixture is subjected to a hydrothermal reaction to obtain a dynamic long afterglow emission material.

5. The preparation method according to claim 4, characterized in that The conditions of the hydrothermal reaction include: temperature of 170-240° C. and time of 2-72 hours.

6. The preparation method according to claim 4, characterized in that The method further comprises filtering and freeze-drying after the hydrothermal reaction to obtain a dynamic long afterglow emission material.

7. Use of the dynamic long afterglow emission material according to any one of claims 1 to 3 in any one of dynamic color-changing anti-counterfeiting, ink, WLED and 3D materials.

8. Use of the dynamic long afterglow emission material according to any one of claims 1 to 3 in the conversion of short-wavelength light to long-wavelength light.

9. The use according to claim 7, characterized in that The application comprises: irradiating the dynamic long afterglow emission material with a light source having a wavelength of 254 to 420 nm.

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