Preparation method of colorful and white light long-afterglow luminescent material and full-color display application of colorful and white light long-afterglow luminescent material

Abstract

The invention discloses a preparation method of a colorful and white-light long-afterglow luminescent material and full-color display application thereof.The preparation method of the long-afterglow luminescent material comprises the steps that a luminous body solution is dropwise added to a polymer matrix, hot pressing is conducted at the temperature of 190-210 DEG C for at least 5 minutes, cooling is conducted to the room temperature, and the long-afterglow luminescent material is obtained, the luminous body solution comprises luminous small molecules and a solvent, the luminous small molecules are one or a mixture of more of sarranine, coumarin and acridone, the polymer matrix comprises a polymer, and the polymer is a styrene-acrylonitrile copolymer. The white light afterglow luminescent material with chromaticity coordinates closer to standard white light can be obtained only by taking sarranine, coumarin and acridone as luminescent micromolecules without complicated energy transfer while colorful afterglow luminescence is induced.

Description

Technical Field

[0001] The present invention belongs to the technical field of organic long afterglow materials, and in particular relates to a preparation method and application of a long afterglow luminescent material. Background Art

[0002] Organic long-lasting luminescence materials (OLPLMs) are materials that absorb and store energy when excited by light and then slowly release it as light when the light source is removed. In recent years, they have attracted widespread attention from researchers due to their low cost, environmentally friendly and simple preparation process, and excellent luminescence performance. Common methods for inducing luminescence in organic long-lasting luminescence materials include crystallization induction, host-guest interaction, heavy atom interaction, polymer matrix induction, and hydrogen bonding. Polymer matrix induction is an effective and convenient method. Commonly used polymer matrices in the literature include polyvinyl alcohol (PVA), polymethyl methacrylate (PMMA), and polyvinylpyrrolidone (PVP). Furthermore, the polymer matrix and luminescent small molecules are typically mixed uniformly using a full solvent method, followed by solvent removal to produce the long-lasting luminescence material. While this method can effectively induce long-lasting luminescence in organic materials, it suffers from low preparation efficiency, often wastes a large amount of solvent, and is difficult to achieve uniform production over large areas. Therefore, it is highly desirable to design a simple and universal method to induce long-lasting luminescence in organic molecules.

[0003] The simultaneous realization of full-spectrum afterglow luminescence and high-purity white light output has far-reaching significance for the development and application of organic long-afterglow materials. It is extremely necessary to use a simple and universal method to prepare organic long-afterglow materials that can emit full-spectrum afterglow and output high-purity white light. From the perspective of molecular regulation, in the existing technology, the realization of multi-color afterglow in organic systems mainly relies on the electronic structure modulation of the conjugated benzene ring system or the construction of an energy transfer system to achieve broad color gamut coverage, and the preparation method is complex. In addition, it is worth noting that the white light afterglow systems currently reported in the literature generally have problems such as complex preparation process and insufficient color purity. Their chromaticity coordinates are generally (0.33, 0.34), which deviates from the ideal white point (0.333, 0.333). Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention aims to provide a method for preparing a long afterglow luminescent material.

[0005] Another object of the present invention is to provide a long-lasting luminescent material obtained by the above preparation method.

[0006] Another object of the present invention is to provide an application of the long-afterglow luminescent material in full-color display.

[0007] The purpose of the present invention is achieved through the following technical solutions.

[0008] A method for preparing a long-lasting luminescent material comprises: dropwise adding a luminophore solution onto a polymer matrix, hot-pressing at 190° C. to 210° C. for at least 5 minutes, and cooling to room temperature to obtain the long-lasting luminescent material, wherein the luminophore solution comprises a luminescent small molecule and a solvent, wherein the luminescent small molecule is one or a mixture of several of safranin, coumarin, and acridone; and the polymer matrix comprises a polymer, wherein the polymer is a styrene-acrylonitrile copolymer (AS).

[0009] Calculated by mass, the ratio of the luminescent small molecules to the polymer in the luminescent body solution is (0.1-1.85):300.

[0010] In the above technical solution, the concentration of the luminescent small molecules in the luminophore solution is 0.5 to 1.5 mg / mL.

[0011] In the above technical solution, the method for obtaining the polymer matrix includes: hot-pressing the polymer into a film at 190-210° C. to obtain the polymer matrix.

[0012] In the above technical solution, the thickness of the polymer matrix is ​​less than 1 mm.

[0013] In the above technical solution, the solvent is at least one of anhydrous ethanol and dichloromethane.

[0014] In the above technical solution, the method for obtaining the luminophore solution includes: mixing the luminescent small molecules and the solvent until they are uniform to obtain the luminophore solution.

[0015] In the above technical solution, the structural formula of safranin is: The structural formula of coumarin is: The structural formula of acridone is:

[0016] In the above technical solution, when the luminescent small molecule is one of safranin, coumarin and acridone, the luminophore solution is a single-molecule luminophore solution; when the luminescent small molecule is a mixture of two or three of safranin, coumarin and acridone, the luminophore solution is a multi-molecule luminophore mixed solution;

[0017] When the luminophore solution is a single-molecule luminophore solution, the ratio of the luminescent small molecule to the polymer is (0.1-1):300 by mass;

[0018] When the luminescent small molecule is a mixture of safranin, coumarin and acridone, the ratio of safranin, coumarin, acridone and polymer is 1:(0.1-0.75):0.1:300 in parts by mass.

[0019] In the above technical solution, the hot pressing pressure is 0.2 to 0.8 MPa.

[0020] The long afterglow luminescent material obtained by the above preparation method.

[0021] In the above technical solution, the thickness of the long afterglow luminescent material is less than 1 mm.

[0022] Application of the above-mentioned long afterglow luminescent materials in full-color display.

[0023] In the above technical solution, when the luminescent small molecule is one of safranin, coumarin and acridone, the long afterglow emitted by the long afterglow luminescent material is orange, cyan or green; when the luminescent small molecule is a mixture of safranin, coumarin and acridone, the long afterglow emitted by the long afterglow luminescent material is white light.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) The present invention induces colorful afterglow luminescence without complex energy transfer. It only requires safranin, coumarin and acridone as luminescent small molecules to obtain a white light afterglow luminescent material with a chromaticity (CIE) coordinate closer to standard white light.

[0026] (2) The long afterglow luminescent material obtained by the present invention can be formed into a thin film and applied to full-color display. Compared with traditional projection screens, it has the advantages of high resolution and good color effect.

[0027] (3) The present invention prepares a long afterglow luminescent material with good effect by adding a small amount of solvent. The polymer matrix is ​​obtained by hot pressing and does not need to be dissolved by solvent. The preparation process is green and simple, and the preparation method is universal. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a macroscopic LPL image of the long afterglow luminescent material prepared in Example 1;

[0029] Figure 2 This is a macroscopic LPL image of the long afterglow luminescent material prepared in Example 2;

[0030] Figure 3 This is a macroscopic LPL image of the long afterglow luminescent material prepared in Example 3;

[0031] Figure 4 This is a macroscopic LPL image of the long afterglow luminescent material prepared in Example 4;

[0032] Figure 5 This is the CIE diagram of the long afterglow luminescent material prepared in Example 4;

[0033] Figure 6 This is a macroscopic LPL image of the long afterglow luminescent material prepared in Example 5;

[0034] Figure 7 This is a macroscopic LPL image of the long afterglow luminescent material prepared in Example 6;

[0035] Figure 8 This is a macroscopic LPL image of the long afterglow luminescent material prepared in Comparative Example 1;

[0036] Figure 9 This is a photo of the application of long-lasting luminescent materials in projection display;

[0037] Figure 10 This is a macroscopic LPL image of the long afterglow luminescent material prepared in Example 7;

[0038] Figure 11 This is the absorption spectrum of the long afterglow luminescent material prepared in Example 1;

[0039] Figure 12 The phosphorescence spectrum of the long afterglow luminescent material prepared in Example 1;

[0040] Figure 13 This is the absorption spectrum of the long afterglow luminescent material prepared in Example 2;

[0041] Figure 14 The phosphorescence spectrum of the long afterglow luminescent material prepared in Example 2;

[0042] Figure 15 This is the absorption spectrum of the long afterglow luminescent material prepared in Example 3;

[0043] Figure 16 The phosphorescence spectrum of the long afterglow luminescent material prepared in Example 3;

[0044] Figure 17 This is the phosphorescence spectrum of the long afterglow luminescent material prepared in Example 4. DETAILED DESCRIPTION

[0045] The technical solution of the present invention is further described below with reference to specific embodiments.

[0046] The raw material information involved in the following examples and comparative examples is as follows:

[0047] Safranin, coumarin and acridone were purchased from Tianjin Xiens Biochemical Technology Co., Ltd. (purity: 98%), AS and PS were purchased from Shanghai Myrrel Biochemical Technology Co., Ltd., the CAS number of AS is: 9003-54-7, the product number is:

[0048] M69151-100G; PS CAS: 9003-53-6, item number: M87663-500G.

[0049] Room temperature: 20~25℃.

[0050] The power of the UV lamp in the following embodiments and comparative examples is 30W.

[0051] In the following examples and comparative examples, the hot pressing pressure was 0.5 MPa.

[0052] Examples 1 to 3

[0053] A method for preparing a long-lasting luminescent material comprises: dropwise adding a luminophore solution (single-molecule luminophore solution) onto a polymer matrix, hot-pressing at 200° C. for 6 minutes, and cooling to room temperature to obtain a long-lasting luminescent material (multicolor afterglow luminescent material) with a thickness of 500 microns. The luminophore solution comprises a luminescent small molecule and a solvent, wherein the luminescent small molecule is A. The polymer matrix comprises a polymer. The ratio of the luminescent small molecule in the luminophore solution to the polymer in the polymer matrix is ​​1:300, and the concentration of the luminescent small molecule in the luminophore solution is 1 mg / mL.

[0054] The method for obtaining the polymer matrix includes: hot-pressing the polymer at 200° C. for 3 minutes to form a film, thereby obtaining a polymer matrix with a thickness of 500 μm. The polymer is styrene-acrylonitrile copolymer (AS).

[0055] The method for obtaining a luminophore solution comprises: mixing luminescent small molecules and a solvent until uniform to obtain a luminophore solution, wherein the solvent is B.

[0056] A and B are shown in Table 1.

[0057] Table 1

[0058] Long afterglow luminescent materials A B Example 1 Saffron Anhydrous ethanol Example 2 Coumarin dichloromethane Example 3 Acridone Anhydrous ethanol

[0059] Examples 4 to 6

[0060] A method for preparing a long-lasting luminescent material comprises: dropwise adding a luminophore solution (a mixed solution of multi-molecular luminophores) onto a polymer matrix, hot-pressing at 200° C. for 10 minutes, and cooling to room temperature to obtain a long-lasting luminescent material (white-light afterglow luminescent material) having a thickness of 500 microns. The luminophore solution comprises luminescent small molecules and a solvent, wherein the luminescent small molecules are a mixture of safranin, coumarin, and acridone. The polymer matrix comprises a polymer, wherein the ratio of safranin, coumarin, acridone, and polymer is X by mass. The concentration of (total) luminescent small molecules in the luminophore solution is Y mg / mL.

[0061] The method for obtaining the polymer matrix includes: hot-pressing the polymer at 200° C. for 3 minutes to form a film, thereby obtaining a polymer matrix with a thickness of 500 μm. The polymer is styrene-acrylonitrile copolymer (AS).

[0062] The method for obtaining the luminophore solution comprises: mixing luminescent small molecules and a solvent until uniform to obtain the luminophore solution, wherein the solvent is a mixture of anhydrous ethanol and dichloromethane, and the ratio of anhydrous ethanol to dichloromethane is Z by volume.

[0063] X, Y and Z are shown in Table 2.

[0064] Table 2

[0065] Long afterglow luminescent materials X Y (mg / mL) Z Example 4 1：0.1：0.1：300 1 1.1：0.1 Example 5 1：0.25：0.1：300 1 1.1：0.25 Example 6 1：0.5：0.1：300 1.33 1.1：0.1

[0066] Comparative Example 1

[0067] A method for preparing a white light long afterglow luminescent material is basically the same as that of Example 4, except that "the polymer is styrene-acrylonitrile copolymer (AS)" is replaced by "the polymer is polystyrene (PS)".

[0068] At room temperature, the long afterglow luminescent material prepared in Example 1 was excited by a 365nm ultraviolet lamp. After irradiation for 3 seconds, the ultraviolet lamp was turned off to obtain the following: Figure 1 The macro LPL picture shown, Figure 1 From left to right in the figure are the macroscopic LPL images when the UV lamp is excited, and 1s, 2s, and 4s after the UV lamp is turned off. Figure 1 As shown, the long afterglow luminescent material prepared in Example 1 is pink fluorescence when excited by ultraviolet light, and the afterglow is orange light after the ultraviolet light is turned off. The afterglow time of the long afterglow luminescent material prepared in Example 1 is 4s, and the afterglow luminescence is relatively uniform, indicating that when the polymer is styrene-acrylonitrile copolymer (AS), safranin as a luminescent small molecule can induce orange afterglow luminescence, and the long afterglow luminescent material prepared in Example 1 is an orange afterglow luminescent material.

[0069] At room temperature, the long afterglow luminescent material prepared in Example 2 was excited by a 365nm ultraviolet lamp. After irradiation for 3 seconds, the ultraviolet lamp was turned off to obtain the following: Figure 2 The macro LPL picture shown, Figure 2 From left to right in the figure are the macroscopic LPL images when the UV lamp is excited, and at 1s, 2s, 4s, and 6s after the UV lamp is turned off. Figure 2 As shown, the long afterglow luminescent material prepared in Example 2 is blue fluorescence when excited by ultraviolet light, and the afterglow is green light after the ultraviolet light is turned off. The afterglow time of the long afterglow luminescent material prepared in Example 2 is 6s, and the afterglow luminescence is relatively uniform, indicating that when the polymer is styrene-acrylonitrile copolymer (AS), coumarin as a luminescent small molecule can induce green afterglow luminescence, and the long afterglow luminescent material prepared in Example 2 is a green afterglow luminescent material.

[0070] At room temperature, the long afterglow luminescent material prepared in Example 3 was excited by a 365nm ultraviolet lamp. After irradiation for 3 seconds, the ultraviolet lamp was turned off to obtain the following: Figure 3 The macro LPL picture shown, Figure 3 From left to right in the figure are the macroscopic LPL images when the UV lamp is excited, and at 1s, 2s, 4s, 6s, 8s and 11s after the UV lamp is turned off. Figure 3 As shown, the long afterglow luminescent material prepared in Example 3 is blue fluorescence when excited by ultraviolet lamp, and the afterglow is cyan light after the ultraviolet lamp is turned off. The afterglow time of the long afterglow luminescent material prepared in Example 3 is 11s, and the afterglow luminescence is relatively uniform, indicating that when the polymer is styrene-acrylonitrile copolymer (AS), acridone as a luminescent small molecule can induce cyan afterglow luminescence, and the long afterglow luminescent material prepared in Example 3 is a cyan afterglow luminescent material.

[0071] At room temperature, the long afterglow luminescent material prepared in Example 4 was excited with a 365nm ultraviolet lamp for 3 seconds and then the ultraviolet lamp was turned off to obtain the following: Figure 4 The macro LPL picture shown, Figure 4 From left to right in the figure are the macroscopic LPL images when the UV lamp is excited, and at 1s, 3s, 6s, 8s, and 10s after the UV lamp is turned off. Figure 4 As shown, when excited by ultraviolet light, the long-lasting luminescent material prepared in Example 4 emits blue-purple fluorescence. After the ultraviolet light is turned off, the afterglow color gradually changes from blue-white to warm white. The afterglow color in the third second is closest to standard white light. The afterglow time of the long-lasting luminescent material prepared in Example 4 is 10 seconds, and the afterglow emission is relatively uniform. This shows that when the polymer is styrene-acrylonitrile copolymer (AS), safranin, coumarin, and acridone as luminescent small molecules can induce white afterglow emission. In addition, Figure 1 The afterglow time of the medium orange light is 4s. Figure 2 The afterglow time of the medium green light is 6s. Figure 3 The afterglow time of the medium cyan light is 11s. Figures 1 to 3 If the afterglow light is simply superimposed with colors, the luminous time of the white afterglow of the long afterglow luminescent material should not exceed 4s. Figure 4As can be seen from the figure, the long-lasting luminescent material prepared in Example 4 still emits white afterglow 10 seconds after the excitation light source is turned off. Therefore, Example 4 is not a simple superposition of the long afterglow obtained in Examples 1 to 3. Compared with Examples 1 and 2, Example 4 increases the afterglow duration of both safranin and coumarin. From this, it can be understood that under the condition that safranin, coumarin, and acridone are simultaneously used as luminescent small molecules, a synergistic effect is generated among the three. It is inferred that this may be due to the energy transfer caused by the mixed doping of safranin, coumarin, and acridone into the polymer matrix, which synergistically induces white afterglow luminescence and extends the afterglow time to 10 seconds.

[0072] At room temperature, a phosphorescence spectrum test was performed in the 385-700 nm band using an Ocean Optics multi-band spectrometer, specifically comprising: irradiating the long afterglow luminescent material prepared in Example 4 with a 365 nm ultraviolet lamp for 3 seconds, turning off the ultraviolet lamp, and testing the phosphorescence intensity at 0 ms, 500 ms, 1000 ms, 1500 ms, 2300 ms, 3500 ms, and 6000 ms after the ultraviolet lamp was turned off, to obtain the following: Figure 17 The phosphorescence spectrum shown in FIG. 1 was processed by Origin software to obtain the following phosphorescence spectrum: Figure 5 The chromaticity diagram (CIE diagram) shown in Figure 5 The horizontal coordinate x is the normalized red component ratio, and the vertical coordinate y is the normalized green component ratio. Figure 5 The wavelength values ​​outside the middle area (460, 480, 500, 520, 540, 560, 580, 600, 620) represent the position of pure color light of a specific wavelength on the CIE diagram. Figure 5 It can be seen that the color of the afterglow corresponding to the 0th ms, 500th ms, 1000th ms, 1500th ms, 2300th ms, 3500th ms, and 6000th ms moves from the blue area to the orange area, wherein the CIE coordinate point at the 2300th ms is (0.333, 0.331), which is closer to the afterglow of the standard white light (0.333, 0.333). This shows that the present invention induces afterglow luminescence closer to the standard white light by using safranin, coumarin and acridone as luminescent small molecules. In addition, by Figure 5 As shown in the chromaticity diagram, after the UV lamp is turned off, the color of the afterglow moves from the blue area to the orange area as time continues, further confirming the conclusion that "Example 4 is not a simple superposition of the long afterglow obtained in Examples 1 to 3."

[0073] At room temperature, the long afterglow luminescent material prepared in Example 5 was excited with a 365nm ultraviolet lamp for 3 seconds and then the ultraviolet lamp was turned off to obtain the following: Figure 6 The macro LPL picture shown in Figure 6From left to right in the figure are the macroscopic LPL images when the UV lamp is excited, and at 1s, 3s, 6s, 8s, and 10s after the UV lamp is turned off. Figure 6 As shown, the afterglow time of the long afterglow luminescent material prepared in Example 5 is 10s, the afterglow luminescence is white light, and the afterglow luminescence is relatively uniform.

[0074] At room temperature, the long afterglow luminescent material prepared in Example 6 was excited by a 365 nm ultraviolet lamp. After irradiation for 3 seconds, the ultraviolet lamp was turned off to obtain the following: Figure 7 The macro LPL picture shown in Figure 7 From left to right in the figure are the macroscopic LPL images of the UV light excitation, 1s, 3s, 6s, 8s and 10s after the UV light is turned off. Figure 7 As shown, the afterglow time of the long afterglow luminescent material prepared in Example 6 is 10s, the afterglow luminescence is white light, and the afterglow luminescence is relatively uniform.

[0075] At room temperature, the long afterglow luminescent material prepared in Comparative Example 1 was excited with a 365nm ultraviolet lamp. After irradiation for 3 seconds, the ultraviolet lamp was turned off to obtain the following: Figure 8 The macro LPL picture shown, Figure 8 From left to right in the figure are the macroscopic LPL images when the UV lamp is excited, and at 1s, 2s, 3s, 4s, and 5s after the UV lamp is turned off. Figure 8 As shown in the figure, the long afterglow luminescent material prepared in Comparative Example 1 is bluish-purple fluorescence when excited by ultraviolet lamp, and the afterglow is blue light after the ultraviolet lamp is turned off. The afterglow time of the long afterglow luminescent material prepared in Comparative Example 1 is 5s, indicating that when the polymer is polystyrene (PS), safranin, coumarin and acridone as luminescent small molecules do not induce white light afterglow luminescence, but induce blue light afterglow luminescence.

[0076] During the process of debugging white light long-lasting luminescence, changing the doping ratio of safranin, coumarin, and acridone, without changing other conditions, did not affect the color of the afterglow. Simply changing the polymer from styrene-acrylonitrile copolymer (AS) to polystyrene (PS), while their fluorescence was the same, did not induce white light afterglow when the polymer was PS, demonstrating the importance of polymer selection in the preparation of white light afterglow materials. Furthermore, when only one of the luminescent small molecules, safranin, coumarin, or acridone, was present, white light afterglow was also not induced.

[0077] According to the preparation method of the long afterglow luminescent material obtained in Examples 1 to 4, long afterglow luminescent materials were prepared respectively and used as orange afterglow luminescent films, green afterglow luminescent films, cyan afterglow luminescent films, and white afterglow luminescent films, respectively. The orange afterglow luminescent film, the green afterglow luminescent film, the cyan afterglow luminescent film, and the white afterglow luminescent film each corresponded to a film sheet, and a hollow pattern of the number "2" was formed on the film sheet corresponding to the orange afterglow luminescent film, a hollow pattern of the number "0" was formed on the film sheet corresponding to the green afterglow luminescent film, a hollow pattern of the number "2" was formed on the film sheet corresponding to the cyan afterglow luminescent film, and a hollow pattern of the number "5" was formed on the film sheet corresponding to the white afterglow luminescent film.

[0078] Orange afterglow luminescent film, green afterglow luminescent film, cyan afterglow luminescent film and white afterglow luminescent film were used as projection screens respectively, and a 365nm ultraviolet lamp was used as the excitation light source to irradiate the projection screen through the film for 3 seconds (adjust the appropriate focal length so that the light of the excitation light source passes through the corresponding film and focusing lens of the projection screen in turn, and is finally projected onto the projection screen). A clear fluorescent digital pattern was obtained. After turning off the excitation light source, the following was obtained: Figure 9 The persistence pattern shown.

[0079] like Figure 9 As shown, it can be seen that the orange afterglow pattern on the orange afterglow luminescent film shows "2", the green afterglow pattern on the green afterglow luminescent film shows "0", the cyan afterglow pattern on the cyan afterglow luminescent film shows "2", and the white afterglow pattern on the white afterglow luminescent film shows "5". The resolution of the afterglow is relatively high and the luminescence is uniform, indicating that the long afterglow luminescent material prepared by the present invention has a good afterglow effect and can be used in projection display.

[0080] Example 7

[0081] A method for preparing a long afterglow luminescent material is basically the same as that of Example 4, except that the luminescent small molecules are safranin and acridone, and the ratio of safranin, acridone and polymer is 1:0.75:300 by mass.

[0082] At room temperature, the long afterglow luminescent material prepared in Example 7 was excited by a 365 nm ultraviolet lamp. After irradiation for 3 seconds, the ultraviolet lamp was turned off to obtain the following: Figure 10 The macro LPL picture shown, Figure 10 From left to right in the figure are the macroscopic LPL images when the UV lamp is excited, and at 1s, 3s, 6s, 8s, and 10s after the UV lamp is turned off. Figure 10 As shown, the fluorescence is pink when excited by the UV lamp, and the afterglow color gradually changes from blue-white to warm white after the UV lamp is turned off.

[0083] The absorption spectrum of the long afterglow luminescent material prepared in Example 1 was measured by Shimadzu UV-2700 ultraviolet-visible spectrophotometer. Figure 11 As shown, the absorption spectrum of the long afterglow luminescent material prepared in Example 2 was measured by Shimadzu UV-2700 ultraviolet-visible spectrophotometer. Figure 13 As shown, the absorption spectrum of the long afterglow luminescent material prepared in Example 3 was measured by Shimadzu UV-2700 ultraviolet-visible spectrophotometer. Figure 15 shown.

[0084] The phosphorescence spectrum of the long afterglow luminescent material prepared in Example 1 was measured by an Ocean Optics multi-band spectrometer. Figure 12 As shown, the phosphorescence spectrum of the long afterglow luminescent material prepared in Example 2 was measured by an Ocean Optics multi-band spectrometer. Figure 14 As shown, the phosphorescence spectrum of the long afterglow luminescent material prepared in Example 3 was measured by an Ocean Optics multi-band spectrometer. Figure 16 shown.

[0085] The above is an exemplary description of the present invention. It should be noted that, without departing from the core of the present invention, any simple deformation, modification or other equivalent replacement that can be made by other skilled in the art without expending creative labor falls within the scope of protection of the present invention.

Claims

1. A method for preparing a long afterglow luminescent material, characterized in that: include: The luminophore solution is added dropwise onto a polymer matrix, hot-pressed at 190-210° C. for at least 5 minutes, and cooled to room temperature to obtain a long-lasting luminescent material, wherein the luminophore solution comprises: a luminescent small molecule and a solvent, wherein the luminescent small molecule is one or a mixture of several selected from the group consisting of safranin, coumarin, and acridone, and the polymer matrix comprises: a polymer, wherein the polymer is a styrene-acrylonitrile copolymer; Calculated by mass, the ratio of the luminescent small molecules in the luminescent body solution to the polymer in the polymer matrix is ​​(0.1-1.85):

300.

2. The preparation method according to claim 1, characterized in that The concentration of the luminescent small molecules in the luminophore solution is 0.5 to 1.5 mg / mL.

3. The preparation method according to claim 1, characterized in that The method for obtaining the polymer matrix comprises: hot-pressing the polymer into a film at 190-210 DEG C to obtain the polymer matrix.

4. The preparation method according to claim 1, characterized in that When the luminescent small molecule is one of safranin, coumarin and acridone, the luminescent body solution is a single-molecule luminescent body solution; when the luminescent small molecule is a mixture of two or three of safranin, coumarin and acridone, the luminescent body solution is a multi-molecule luminescent body mixed solution.

5. The preparation method according to claim 4, characterized in that When the luminophore solution is a single-molecule luminophore solution, the ratio of the luminescent small molecules to the polymer is (0.1-1):300 in parts by mass.

6. The preparation method according to claim 4, characterized in that When the luminescent small molecule is a mixture of safranin, coumarin and acridone, the ratio of safranin, coumarin, acridone and polymer is 1:(0.1-0.75):0.1:300 in parts by mass.

7. A long afterglow luminescent material comprising: A polymer matrix and a luminescent small molecule, wherein the luminescent small molecule is one or a mixture of safranin, coumarin and acridone. The polymer matrix comprises a polymer, and the polymer is a styrene-acrylonitrile copolymer.

8. The long afterglow luminescent material according to claim 7, characterized in that The thickness of the long afterglow luminescent material is less than 1 mm.

9. Use of the long afterglow luminescent material as claimed in claim 7 in full-color display.

10. The use according to claim 9, characterized in that When the luminescent small molecule is one of safranin, coumarin and acridone, the long afterglow emitted by the long afterglow luminescent material is orange, cyan or green; when the luminescent small molecule is a mixture of safranin, coumarin and acridone, the long afterglow emitted by the long afterglow luminescent material is white light.

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