Manufacturing method of circularly polarized organic ultra-long room-temperature phosphorescent film based on chiral lyotropic liquid crystal

Abstract

The invention provides a manufacturing method of a circularly polarized organic ultra-long room-temperature phosphorescent film based on chiral lyotropic liquid crystal, and belongs to the technical field of optical materials, and the manufacturing method comprises the following steps: step 1, dissolving glucose and room-temperature phosphorescent polymer (RTP) in a cellulose nanocrystal (CNC) aqueous solution, and uniformly mixing; and 2, putting the mixed solution in the step 1 into an open device, and evaporating to obtain the circularly polarized organic ultra-long room-temperature phosphorescent film based on the chiral lyotropic liquid crystal, which is marked as a CP-RTP film. According to the invention, different types of RTP: P1, P2, P3 or P4 are doped with chiral lyotropic liquid crystal CNC by virtue of glucose, so that the mixed chiral photon film with full-color and adjustable CP-RTP characteristics is shown, and meanwhile, the glum value as high as 0.59 and the long-life phosphorescence life of 371 milliseconds are realized. In addition, the three-dimensional thin film with excellent processability and multi-polarization characteristic can be realized by means of some molds.

Description

Technical Field

[0001] The invention belongs to the technical field of optical materials, and in particular is a method for preparing a circularly polarized organic ultra-long room temperature phosphorescence (CP-OURTP) film based on chiral lyotropic liquid crystal. Background Art

[0002] Organic room temperature phosphorescent (RTP) materials have attracted extensive attention due to their long emission lifetime, low cost, easy processing, light weight and flexibility. RTP materials with circularly polarized luminescence properties have a wide range of applications in three-dimensional optical display, information storage, optoelectronic devices and anti-counterfeiting. However, conventional methods to achieve circularly polarized RTP (CP-RTP), such as covalent attachment of chiral moieties or host-guest doping strategies, usually result in low circularly polarized phosphorescence asymmetry factors (glum values), which greatly limits their practical applications.

[0003] To address the above-mentioned problems, existing technologies include: (1) Combining RTP with chiral liquid crystals (CLCs), especially cholesteric, can increase the glum value by 1-2 orders of magnitude. However, compatibility issues between RTP and liquid crystals usually lead to poor processing performance, thus hindering its practical implementation. (2) Cellulose nanocrystals (CNCs) are a class of natural chiral nanomaterials that can self-assemble into iridescent left-handed cholesteric phase films through evaporation-induced self-assembly (EISA). This inherent chiral structure makes them ideal hosts or templates for embedding luminescent materials (such as carbon dots, quantum dots, and fluorescent dyes), making it possible to achieve high glum values. However, due to the loose stacking environment, directly doping small RTP molecules into the CNC matrix usually fails to produce long-lived phosphorescence. Summary of the invention

[0004] The present invention provides a method for preparing a circularly polarized organic ultra-long room temperature phosphorescent (CP-OURTP) film based on chiral lyotropic liquid crystal, which aims to construct a high g lum A full-color circularly polarized RTP (CP-RTP) system with high color value and excellent processing performance is developed. This method takes advantage of the excellent compatibility of glucose and acrylamide-based RTP polymers with CNC to prepare RTP materials with different colors and integrate them into CNC aqueous solution, which can obtain chiral hybrid photonic films with full-color and adjustable CP-RTP properties. Among them, acrylamide acts as a polymer backbone because it can form a rigid network, stabilize triplet excitons, and promote long lifetime and high phosphorescence quantum yield (QY). The photonic band gap (PBG) of these CP-RTP films can be modulated by adjusting the content of glucose and RTP, thereby flexibly controlling the iridescent reflection color and CP-RTP intensity. The fabricated CP-RTP films have a g value of up to 0.59. lumvalue and a phosphorescence lifetime of 371 milliseconds, while maintaining excellent processability and being able to be molded into any three-dimensional shape.

[0005] Technical solution: A method for preparing a circularly polarized organic ultra-long room temperature phosphorescent (CP-OURTP) film based on chiral lyotropic liquid crystal, comprising the following steps:

[0006] Step 1, dissolving glucose and RTP in CNC aqueous solution and mixing them evenly; RTP represents room temperature phosphorescent polymer, and CNC represents cellulose nanocrystal;

[0007] Step 2, placing the mixed solution in step 1 in an open device, and evaporating to obtain a circularly polarized organic ultra-long room temperature phosphorescent film based on chiral lyotropic liquid crystal, which is recorded as CP-RTP film;

[0008] Furthermore, in the step 1, the mass fraction of CNC in the CNC aqueous solution is 3wt%; the mass volume ratio of the glucose, RTP, and CNC aqueous solution is (5-100mg):(5-40mg):3ml.

[0009] Furthermore, in the step 1, the RTP is any one of P1, P2, P3 and P4.

[0010] Furthermore, in the step 2, the evaporation method is: placing the open device containing the mixed solution in a drying oven, setting the temperature to 25-30° C., the humidity to 50-60% RH, and leaving it to stand for 80-90 hours.

[0011] Furthermore, in the step 2, the open device can be configured into a variety of three-dimensional shapes, thereby manufacturing a three-dimensional film with a special shape.

[0012] Furthermore, the step one is specifically as follows: after dissolving glucose and RTP in the CNC aqueous solution, the mixture is transferred into a brown wide-mouth bottle, and after adding magnetic seeds, the mixture is placed on a magnetic stirring table and stirred for 1 hour to obtain a mixed solution; the step two is specifically as follows: the mixed solution is sucked out with a syringe and a needle, and then the needle is removed and replaced with a filter, and then the mixed solution is filtered into an open device, and then the mixture is placed in a drying oven for evaporation, and a CP-RTP film is obtained after evaporation.

[0013] Furthermore, when the room temperature phosphorescent polymer is P1, P2, P3 or P4, the CP-RTP film prepared in step 2 will respectively show blue, green, yellow or red phosphorescence after being irradiated with UV light.

[0014] Furthermore, the structural color and circularly polarized phosphorescence asymmetry factor (g lum The control method of value is:

[0015] The structural color and g of the obtained CP-RTP film can be regulated by controlling the amount of glucose incorporated and the type and amount of room temperature phosphorescent polymer incorporated. lum value.

[0016] Furthermore, when the amount of RTP remains unchanged (fixed to a value between 10 and 20 mg), as the amount of glucose increases (varying in the range of 5 to 100 mg), the photon bandgap (PBG) of the resulting CP-RTP film red-shifts, while conversely, the PBG blue-shifts;

[0017] When the amount of glucose remains unchanged (fixed at a value between 5 and 90 mg), as the amount of RTP increases (varies within the range of 5 to 40 mg), the PBG of the obtained CP-RTP film red-shifts, while conversely, the PBG blue-shifts;

[0018] The position of the PBG peak of the obtained CP-RTP film was adjusted to correspond to the luminescence spectrum peak of the RTP used. lum The value is the largest, and when the position of the PBG peak of the obtained CP-RTP film deviates from the luminescence spectrum peak of the RTP used, the farther the deviation is, the greater the g lum The smaller the value.

[0019] Furthermore, when the RTP in step 1 is P1, the obtained CP-RTP film has blue fluorescence when irradiated with UV light, which is turned off after irradiation for at least 5 seconds, and blue phosphorescence afterglow is visible. When the P1 content is fixed at 20 mg and the glucose content is adjusted within the range of 5-15 mg, the CP-RTP film can achieve g lum When the glucose content is fixed at 5 mg and adjusted within the range of 20-40 mg, the CP-RTP film can achieve g lum The value is adjusted between -0.13 and -0.07.

[0020] When the RTP in step 1 is P2, the obtained CP-RTP film can be seen to have blue fluorescence when irradiated with UV light, which is turned off after irradiation for at least 5 seconds, and green phosphorescence afterglow can be seen. When the P2 content is fixed to 10 mg and the glucose content is adjusted to vary in the range of 20-65 mg, the CP-RTP film can achieve g lum When the glucose content was fixed at 30 mg and the glucose content was adjusted within the range of 5-20 mg, the CP-RTP film was able to achieve g lum The value is regulated between -0.59 and -0.32.

[0021] When the RTP in step 1 is P3, the obtained CP-RTP film has blue fluorescence when irradiated with UV light, which turns off after irradiation for at least 5 seconds, and yellow phosphorescence afterglow is visible. When the P3 content is fixed at 20 mg and the glucose content is adjusted within the range of 50-70 mg, the CP-RTP film can achieve g lum The value can be adjusted between -0.05 and 0.08; when the glucose content is fixed at 60 mg and the glucose content is adjusted within the range of 20-40 mg, the CP-RTP film can achieve g lum A control with a value between -0.05 and 0.11.

[0022] When the RTP in step 1 is P4, the obtained CP-RTP film has blue fluorescence when irradiated with UV light, which turns off after irradiation for at least 5 seconds, and red phosphorescence afterglow is visible. When the P4 content is fixed at 20 mg and the glucose content is adjusted to vary in the range of 80-100 mg, the CP-RTP film can achieve g lum When the glucose content is fixed at 90 mg and adjusted within the range of 20-40 mg, the CP-RTP film can achieve g lum The value is between -0.06 and 0.14.

[0023] Beneficial effects:

[0024] (1) The present invention uses glucose to dope room temperature phosphorescent polymer (RTP) into chiral lyotropic liquid crystal cellulose nanocrystals (CNC), wherein a large number of hydrogen bonds formed provide a certain degree of flexibility to the film, which can be used to form a three-dimensional film with a variety of patterns with the help of some film molds.

[0025] (2) The present invention uses glucose to dope CNC with RTP materials that emit blue, green, yellow, and red phosphorescent afterglow, demonstrating a hybrid chiral photonic film with full-color and adjustable CP-RTP characteristics. This film achieves a g-value of up to 0.59. lum The iridescent reflection color of the CP-RTP film can be modulated by adjusting the photonic band gap (PBG), and by controlling the movement of the PBG, g lum Value regulation.

[0026] (3) The present invention has the advantages of being easy to prepare on a large scale, having excellent processing performance, and being low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1The chemical structural formulas are cellulose nanocrystals (CNC), glucose, blue phosphorescent polymer (P1), green phosphorescent polymer (P2), yellow phosphorescent polymer (P3), and red phosphorescent polymer (P4).

[0028] Figure 2 The film structural color change and reflection spectrum diagram when four different RTP materials are doped in Examples 1-4 and the photon bandgap (PBG) of the film is adjusted to the phosphorescent emission spectra of four different RTPs; wherein, Figure 2 (a) is the structural color change diagram of CP-RTP film; Figure 2 (b) is the reflectance spectrum.

[0029] Figure 3 Examples 1-4 show three-dimensional CP-RTP films formed by doping four different RTP materials, their fluorescence images under 365 nm UV irradiation, phosphorescence afterglow images after irradiation, and phosphorescence afterglow images taken after adding left-handed circular polarizers and right-handed circular polarizers.

[0030] Figure 4 When four different RTP materials are doped in Examples 1-4, the circularly polarized room temperature phosphorescence asymmetry factor (g lum wherein, Figure (c) and Figure (d) correspond to g in Example 1 lum Figure (a) and (b) correspond to g in Example 2. lum Figure (e) and (f) correspond to g in Example 3 lum Figure (g) and (h) correspond to g in Example 4 lum Value change graph.

[0031] Figure 5 The film structural colors when the films prepared with different raw material concentrations in Examples 1-4 are adjusted to the phosphorescence emission spectra corresponding to RTP. DETAILED DESCRIPTION

[0032] The technical solution of the present invention is described in detail below through embodiments, but the protection scope of the present invention is not limited to the embodiments.

[0033] The present invention is a method for preparing a circularly polarized organic ultra-long room temperature phosphorescence (CP-OURTP) film based on chiral lyotropic liquid crystal. The method can produce a hybrid chiral photonic film with full-color and adjustable CP-RTP characteristics, while achieving a g-value of up to 0.59. lum The 3D film has excellent processability and multi-polarization properties, and has a long phosphorescence lifetime of 371 milliseconds.

[0034] In the following embodiments of the present invention, the molecular structures of cellulose nanocrystals (CNC), glucose, P1, P2, P3 and P4 are as follows: Figure 1 As shown. CNC was from Nanjing Ruiniu Energy New Material Technology Co., Ltd.; glucose was from China National Pharmaceutical Group Chemical Reagent Co., Ltd.; P1, P2, P3 and P4 were from Nanjing Leyao Technology Co., Ltd.

[0035] Example 1

[0036] This embodiment provides a method for preparing a circularly polarized organic ultra-long room temperature phosphorescent (CP-OURTP) film based on chiral lyotropic liquid crystal, wherein RTP is P2, and the specific preparation steps are as follows:

[0037] Step (1), 30 mg of glucose and 10 mg of P2 were dissolved in 3 ml of CNC aqueous solution (3 wt%), and placed into a brown wide-mouth bottle through a pipette, and a magnetic seed was added and placed on a magnetic stirring table, and stirred for 1 hour to fully dissolve and mix the materials evenly.

[0038] Step (2): The obtained solution is sucked out with a syringe and a needle, and then the needle is removed and replaced with a filter tip, and the solution is filtered into a round plastic culture dish (the diameter of the culture dish is 35 mm). Note whether the solution obtained in this step contains bubbles, because it will affect the final film formation. If there are bubbles, they can be removed with a clean medicine spoon or other tools.

[0039] Step (3), placing the culture dish in a drying oven, and leaving it to stand for about 80-90 hours in an environment with a temperature of 25-30° C. and a humidity of 50-60% RH, thereby preparing a CP-RTP film.

[0040] Step (4): Take the obtained CP-RTP film (structural color is green) out of the culture dish and irradiate it with ultraviolet light with a wavelength of 365 nanometers (power of 50 mW / cm 2 ) was aligned and illuminated vertically at a distance of about 10 cm. Blue fluorescence was visible during illumination. After irradiation for at least 5 seconds, obvious green phosphorescence was visible when the illumination was turned off. The phosphorescence lifetime was 371 milliseconds. Figure 2 As shown, CNC-G-P2 is the CP-RTP film prepared in this step.

[0041] Step (5), based on step (1) and step (2), all materials are changed to three times the original content, and the round plastic culture dish is replaced with a butterfly-shaped three-dimensional film mold (4.5 cm × 3 cm × 1.5 cm), and the subsequent steps remain unchanged. The obtained CP-RTP three-dimensional film is as follows Figure 3 As shown, CNC-G-P2 is the three-dimensional CP-RTP film prepared in this step.

[0042] Step (6), based on step (1), the content of P2 is fixed at 10 mg, and the content of glucose is changed to 20, 30, and 65 mg respectively, and the subsequent steps remain unchanged. The mechanism is as follows: the pitch of the corresponding CP-RTP film will change, resulting in a change in its photon bandgap (PBG), and its peak position deviates from the phosphorescence spectrum of P2, and the reflective color of the film also changes accordingly; as the glucose content increases, PBG redshifts, and vice versa. At the same time, the circularly polarized phosphorescence asymmetry factor (g lum The value of g) changes with the change of glucose content, and it is maximum when the peak position of PBG in the film corresponds to the peak position of P2 phosphorescence spectrum. When the two peak positions shift, the farther they deviate, the greater the g lum The smaller the value, the Figure 4 As shown in (c), g lum The value control range is -0.59 to -0.16.

[0043] When the glucose content is fixed at 30 mg and the P2 content is changed to 5, 10, and 20 mg, the mechanism is the same as above, such as Figure 4 As shown in (d), g lum The value control range is -0.59 to -0.32.

[0044] Example 2

[0045] This embodiment provides a method for preparing a circularly polarized organic ultra-long room temperature phosphorescent (CP-OURTP) film based on chiral lyotropic liquid crystal, wherein RTP is P1, and the specific steps are as follows.

[0046] Step (1), 5 mg of glucose, 20 mg of P1 and 3 ml of CNC aqueous solution (3 wt%) were placed into a brown wide-mouth bottle by a pipette, a magnetic seed was added and it was placed on a magnetic stirring table, and stirred for 1 hour to fully dissolve the materials and mix them evenly.

[0047] Step (2): The obtained solution is sucked out with a syringe and a needle, and then the needle is removed and replaced with a filter tip, and the solution is filtered into a round plastic culture dish (the diameter of the culture dish is 35 mm). Note whether the solution obtained in this step contains bubbles, because it will affect the final film formation. If there are bubbles, they can be removed with a clean medicine spoon or other tools.

[0048] Step (3), placing the culture dish in a drying oven, and leaving it to stand for about 80-90 hours in an environment with a temperature of 25-30° C. and a humidity of 50-60% RH, thereby preparing a CP-RTP film.

[0049] Step (4): Take the obtained CP-RTP film (structural color is blue) out of the culture dish and irradiate it with ultraviolet light with a wavelength of 365 nanometers (power of 50 mW / cm 2) was aligned and illuminated vertically at a distance of about 10 cm. Blue fluorescence was visible during illumination. After irradiation for at least 5 seconds, obvious blue phosphorescence was visible when the illumination was turned off. The phosphorescence lifetime was 72 milliseconds. Figure 2 As shown, CNC-B-P1 is the CP-RTP film prepared in this step.

[0050] Step (5), based on step (1) and step (2), all materials are changed to three times of the original content, and the round plastic culture dish is replaced with a puppy-shaped three-dimensional film mold (3.8 cm × 4.5 cm × 1.5 cm), and the subsequent steps remain unchanged. The obtained CP-RTP three-dimensional film is as follows Figure 3 As shown, CNC-B-P1 is the three-dimensional CP-RTP film prepared in this step.

[0051] Step (6): Based on step (1), the content of P1 is fixed at 20 mg, and the content of glucose is changed to 5, 10, and 15 mg respectively, and the subsequent steps remain unchanged. The mechanism is the same as in Example 1. Figure 4 As shown in (a), g lum The value control range is -0.13 to -0.05.

[0052] When the glucose content is fixed at 5 mg and the P1 content is changed to 20, 30, and 40 mg respectively, the mechanism is the same as in Example 1. Figure 4 As shown in (b), g lum The value control range is -0.13 to -0.07.

[0053] Example 3

[0054] This embodiment provides a method for preparing a circularly polarized organic ultra-long room temperature phosphorescent (CP-OURTP) film based on chiral lyotropic liquid crystal, wherein RTP is P3, and the specific steps are as follows.

[0055] Step (1), 60 mg of glucose, 20 mg of P3 and 3 ml of CNC aqueous solution (3 wt%) were placed into a brown wide-mouth bottle by a pipette, a magnetic seed was added and it was placed on a magnetic stirring table, and stirred for 1 hour to fully dissolve the materials and mix them evenly.

[0056] Step (2): The obtained solution is sucked out with a syringe and a needle, and then the needle is removed and replaced with a filter tip, and the solution is filtered into a round plastic culture dish (the diameter of the culture dish is 35 mm). Note whether the solution obtained in this step contains bubbles, because it will affect the final film formation. If there are bubbles, they can be removed with a clean medicine spoon or other tools.

[0057] Step (3), placing the culture dish in a drying oven, and leaving it to stand for about 80-90 hours in an environment with a temperature of 25-30° C. and a humidity of 50-60% RH, thereby preparing a CP-RTP film.

[0058] Step (4): The obtained CP-RTP film (with a structural color of yellow) was taken out from the culture dish and exposed to ultraviolet light with a wavelength of 365 nanometers (with a power of 50 mW / cm 2 ) was aligned and irradiated vertically at a distance of about 10 cm. Blue fluorescence was visible during medium irradiation. After irradiation for at least 5 seconds, obvious yellow phosphorescence was visible when the irradiation was turned off. The phosphorescence lifetime was 346 milliseconds. Figure 2 As shown, CNC-Y-P3 is the CP-RTP film prepared in this step.

[0059] Step (5), based on step (1) and step (2), all materials are changed to three times of the original content, and the round plastic culture dish is replaced with a rabbit-shaped three-dimensional film mold (3.3 cm × 3 × 1.5 cm), and the subsequent steps remain unchanged. The obtained CP-RTP three-dimensional film is as follows Figure 3 As shown, CNC-Y-P3 is the three-dimensional CP-RTP film prepared in this step.

[0060] Step (6): Based on step (1), the content of P3 is fixed at 20 mg, and the content of glucose is changed to 50, 60, and 70 mg respectively, and the subsequent steps remain unchanged. The mechanism is the same as in Example 1. Figure 4 As shown in (e), g lum The value adjustment range is -0.05 to 0.08.

[0061] When the glucose content is fixed at 60 mg and the P3 content is changed to 20, 30, and 40 mg respectively, the mechanism is the same as in Example 1. Figure 4 As shown in (f), g lum The value adjustment range is -0.05 to 0.11.

[0062] Example 4

[0063] This embodiment provides a method for preparing a circularly polarized organic ultra-long room temperature phosphorescent (CP-OURTP) film based on chiral lyotropic liquid crystal, wherein RTP is P4, and the specific steps are as follows.

[0064] Step (1), 90 mg of glucose, 20 mg of P4 and 3 ml of CNC aqueous solution (3 wt%) were placed into a brown wide-mouth bottle by a pipette, a magnetic seed was added and it was placed on a magnetic stirring table, and stirred for 1 hour to fully dissolve the materials and mix them evenly.

[0065] Step (2): The obtained solution is sucked out with a syringe and a needle, and then the needle is removed and replaced with a filter tip, and the solution is filtered into a round plastic culture dish (the diameter of the culture dish is 35 mm). Note whether the solution obtained in this step contains bubbles, because it will affect the final film formation. If there are bubbles, they can be removed with a clean medicine spoon or other tools.

[0066] Step (3), placing the culture dish in a drying oven, and leaving it to stand for about 80-90 hours in an environment with a temperature of 25-30° C. and a humidity of 50-60% RH, thereby preparing a CP-RTP film.

[0067] Step (4): Take the obtained CP-RTP film (with a structural color of red) out of the culture dish and illuminate it with ultraviolet light with a wavelength of 365 nanometers (with a power of 50 mW / cm 2 ) was aligned and illuminated vertically at a distance of about 10 cm. Blue fluorescence was visible during illumination. After irradiation for at least 5 seconds, obvious red phosphorescence was visible when the illumination was turned off. The phosphorescence lifetime was 388 milliseconds. Figure 2 As shown, CNC-R-P4 is the CP-RTP film prepared in this step.

[0068] Step (5), based on step (1) and step (2), all materials are changed to half of the original content, and the round plastic culture dish is replaced with a dolphin-shaped three-dimensional film mold (2.5 cm × 3 cm × 1 cm), and the subsequent steps remain unchanged. The obtained CP-RTP three-dimensional film is as follows Figure 3 As shown, CNC-R-P4 is the three-dimensional CP-RTP film prepared in this step.

[0069] Step (6), based on step (1), the content of P4 is fixed at 20 mg, and the content of glucose is changed to 80, 90, and 100 mg respectively, and the subsequent steps remain unchanged. The mechanism is the same as in Example 1, such as Figure 4 As shown in (g), g lum The value adjustment range is -0.03 to 0.13.

[0070] When the glucose content is fixed at 90 mg and the P4 content is changed to 20, 30, and 40 mg respectively, the mechanism is the same as in Example 1. Figure 4 As shown in (h), g lum The value adjustment range is -0.06 to 0.14.

[0071] The film structural colors of the films prepared with different raw material concentrations in the above four embodiments when adjusted to the phosphorescence emission spectrum corresponding to RTP are as follows: Figure 5 The contents of the components in the above four embodiments are shown in Table 1:

[0072] Table 1

[0073]

[0074] The present invention proposes a method for preparing a circularly polarized organic ultra-long room temperature phosphorescent (CP-OURTP) film based on chiral lyotropic liquid crystals, wherein four room temperature phosphorescent polymers of blue (P1), green (P2), yellow (P3) or red (P4) are doped with chiral lyotropic liquid crystals, and the photonic bandgap (PBG) of the cholesteric phase liquid crystals is regulated by adjusting the content of glucose and RTP, thereby flexibly controlling the rainbow color reflection color and g lum In the full-color chiral lyotropic liquid crystal room temperature phosphorescent polymer system, the prepared CP-RTP film has a g value of up to 0.59. lum value and a phosphorescence lifetime of 371 milliseconds, while maintaining excellent processability and being able to be molded into any three-dimensional shape.

[0075] The circularly polarized phosphorescence asymmetry factor (g lum value):

[0076] g lum =2(I L -I R ) / (I L +I R );

[0077] Among them, I L ,I R Represent the intensity of left-handed and right-handed circularly polarized light, respectively, |g lum | max =2.

[0078] g lum The value can be used to measure the polarization degree and rotation direction of light, and its value range is -2 to 2, where 2 represents pure left-handed circularly polarized light, -2 represents pure right-handed circularly polarized light, and 0 represents linearly polarized light or unpolarized light. The closer the absolute value of the circularly polarized luminescence asymmetry factor is to 2, the higher the polarization degree of the light.

[0079] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the present invention itself. Various changes may be made to it in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A method for preparing a circularly polarized organic ultra-long room temperature phosphorescent film based on chiral lyotropic liquid crystal, characterized in that: The steps include: Step 1, dissolving glucose and RTP in CNC aqueous solution and mixing them evenly; RTP represents room temperature phosphorescent polymer, and CNC represents cellulose nanocrystal; Step 2: Place the mixed solution in step 1 in an open device, and after evaporation, obtain a circularly polarized organic ultra-long room temperature phosphorescent film based on chiral lyotropic liquid crystal, which is recorded as CP-RTP film.

2. The method according to claim 1, characterized in that: In the step 1: The mass fraction of CNC in the CNC aqueous solution is 3wt%; the mass volume ratio of the glucose, RTP and CNC aqueous solution is (5-100mg):(5-40mg):3ml.

3. The method according to claim 1, characterized in that: In the step 1, the RTP is any one of P1, P2, P3 and P4, and the structural formulas of P1, P2, P3 and P4 are as follows:

4. The method according to claim 1, characterized in that: In the step 2, the evaporation method is: placing the container containing the mixed solution in a drying oven, setting the temperature to 25-30° C., the humidity to 50-60% RH, and leaving it to stand for 80-90 hours.

5. The method according to claim 1, characterized in that: The step 1 is specifically as follows: after dissolving glucose and RTP in the CNC aqueous solution, the mixture is transferred into a brown wide-mouth bottle, and after adding magnetic seeds, the mixture is placed on a magnetic stirring table and stirred for 1 hour to obtain a mixed solution; The step 2 is specifically as follows: sucking out the mixed solution with a syringe and a needle, then removing the needle and replacing it with a filter, filtering the mixed solution into an open device, and then placing it in a drying oven for evaporation, and obtaining a CP-RTP film after evaporation.

6. The method according to claim 1, characterized in that: When the room temperature phosphorescent polymer is P1, P2, P3 or P4, the CP-RTP film prepared in step 2 will respectively show blue, green, yellow or red phosphorescence after being irradiated with UV light.

7. The manufacturing method according to claim 1, characterized in that: Structural color and circularly polarized phosphorescence asymmetry factor g of the obtained CP-RTP film lum The value is controlled by: The structural color and g of the obtained CP-RTP film can be regulated by controlling the amount of glucose doped and the type and amount of room temperature phosphorescent polymer doped. lum value.

8. The method according to claim 7, characterized in that: When the amount of RTP remains unchanged, as the amount of glucose increases, the photon bandgap PBG of the obtained CP-RTP film red-shifts, while conversely, PBG blue-shifts; When the amount of glucose remains constant, the PBG of the obtained CP-RTP film red-shifts with the increase of the amount of RTP, while conversely the PBG blue-shifts; The position of the PBG peak of the obtained CP-RTP film was adjusted to correspond to the luminescence spectrum peak of the RTP used. lum The value is the largest, and when the position of the PBG peak of the obtained CP-RTP film deviates from the luminescence spectrum peak of the RTP used, the farther the deviation is, the greater the g lum The smaller the value.

9. The manufacturing method according to claim 8, characterized in that: When RTP in step 1 is P1, the obtained CP-RTP film has blue fluorescence when irradiated with UV light, which is turned off after irradiation for at least 5 seconds, and blue phosphorescence afterglow is visible; when the P1 content is fixed at 20 mg and the glucose content is adjusted within the range of 5-15 mg, the CP-RTP film can achieve g lum When the glucose content is fixed at 5 mg and adjusted within the range of 20-40 mg, the CP-RTP film can achieve g lum The value is regulated between -0.13 and -0.07; When RTP in step 1 is P2, the obtained CP-RTP film has blue fluorescence visible when irradiated with UV light, which is turned off after irradiation for at least 5 seconds, and green phosphorescence afterglow is visible; when the P2 content is fixed to 10 mg and the glucose content is adjusted to vary in the range of 20-65 mg, the CP-RTP film can achieve g lum When the glucose content was fixed at 30 mg and the glucose content was adjusted within the range of 5-20 mg, the CP-RTP film was able to achieve g lum The value is between -0.59 and -0.32; When RTP in step 1 is P3, the obtained CP-RTP film has blue fluorescence visible when irradiated with UV light, which is turned off after irradiation for at least 5 seconds, and yellow phosphorescence afterglow is visible; when the P3 content is fixed at 20 mg and the glucose content is adjusted within the range of 50-70 mg, the CP-RTP film can achieve g lum The value can be adjusted between -0.05 and 0.08; when the glucose content is fixed at 60 mg and the glucose content is adjusted within the range of 20-40 mg, the CP-RTP film can achieve g lum The value is regulated between -0.05 and 0.11; When RTP in step 1 is P4, the obtained CP-RTP film has blue fluorescence visible under UV light irradiation, which is turned off after at least 5s of irradiation, and red phosphorescence afterglow is visible; when the P4 content is fixed to 20mg and the glucose content is adjusted to vary in the range of 80-100mg, the CP-RTP film can achieve g lum The value can be adjusted between -0.03 and 0.13; when the glucose content is fixed at 90 mg and the glucose content is adjusted within the range of 20-40 mg, the CP-RTP film can achieve g lum The value is between -0.06 and 0.14.

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