A method for dynamically controlling the asymmetry factor of circularly polarized room temperature phosphorescence based on a soft helical superstructure

Abstract

The invention discloses a method for dynamically regulating an asymmetric factor of circularly polarized room temperature phosphorescence based on a soft helical superstructure, comprising the following steps: step 1, mixing a molecular motor, a chiral agent, a liquid crystal monomer, a photoinitiator and a nematic phase liquid crystal, dissolving the mixture in a dichloromethane solvent, mixing well, and evaporating the solvent to obtain a chiral liquid crystal mixture; step 2, adding a room temperature phosphorescent polymer and polyvinyl alcohol into deionized water to obtain a mixed solution of the room temperature phosphorescent polymer and the polyvinyl alcohol; step 3, spin coating the mixed solution prepared in step 2 on a cleaned glass substrate, and obtaining a P1-PVA film after vacuum drying; step 4, assembling the glass substrate coated with the P1-PVA film and another glass substrate into a liquid crystal box; step 5, injecting the chiral liquid crystal mixture into the liquid crystal box at a temperature not less than a clearing point to obtain a room temperature phosphorescent chiral liquid crystal double-layer film structure; step 6, realizing reversible regulation of the asymmetric factor of circularly polarized phosphorescence under the action of light and temperature.

Description

Technical Field

[0001] The invention belongs to the field of optics and material technology, and specifically is a method for dynamically controlling an asymmetric factor of circularly polarized room temperature phosphorescence based on a soft helical superstructure. Background Art

[0002] Organic room temperature phosphorescent polymers have great application potential in the field of optical information. Traditional methods for achieving circularly polarized organic room temperature phosphorescence mainly include organic crystal aggregation, embedding chiral chromophores into polymer skeletons, using polymers as the main body and organic small molecules as the guest, and doping room temperature phosphorescent polymers into chiral liquid crystals. However, these methods cannot achieve dynamic and reversible regulation of the asymmetric factor of circularly polarized room temperature phosphorescence.

[0003] To address the above problems, existing technologies include (1) uniformly dispersing phosphorescent chiral helical substituted polyacetylene in a polymethyl methacrylate system, which can produce significant dynamic chiral optical modulation characteristics under ultraviolet light irradiation; (2) co-assembling hexathiophenyl luminescent groups with chiral block copolymers to achieve dynamic regulation of circularly polarized luminescence intensity. However, the current technical synthesis process is relatively complicated and cannot achieve dynamic reversible regulation while ensuring a high circularly polarized phosphorescence asymmetry factor. Summary of the invention

[0004] Purpose of the invention: The purpose of the present invention is to solve the problem that the asymmetry factor of the existing circularly polarized room temperature phosphorescence is fixed, and to provide a method for dynamically controlling the asymmetry factor of the circularly polarized room temperature phosphorescence based on a soft helical superstructure. The method constructs a double-layer membrane system of a room temperature phosphorescent polymer and a soft helical superstructure doped with a molecular motor, controls the illumination time and temperature, realizes the reversible flipping of the chirality of the molecular motor, and then changes the photonic bandgap of the double-layer membrane structure, and finally realizes the dynamic reversible regulation of the asymmetry factor of the circularly polarized room temperature phosphorescence of the soft helical superstructure.

[0005] Technical solution: A method for dynamically controlling the asymmetric factor of circularly polarized room temperature phosphorescence based on a soft helical superstructure, comprising the following steps:

[0006] Step 1, mixing a molecular motor, a chiral agent, a liquid crystal monomer, a photoinitiator, and a nematic liquid crystal, dissolving the mixture in a dichloromethane solvent, mixing well, and evaporating the solvent to obtain a chiral liquid crystal mixture (i.e., a photoresponsive soft helical superstructure mixture); the molecular motor is M1, the chiral agent is R811, the liquid crystal monomer is RM257, the photoinitiator is IRG651, and the nematic liquid crystal is HNG7156;

[0007] Step 2, adding a room temperature phosphorescent polymer and polyvinyl alcohol into deionized water, mixing evenly, and heating to obtain a mixed solution of the room temperature phosphorescent polymer and polyvinyl alcohol; the room temperature phosphorescent polymer is P1;

[0008] Step 3: Spin-coat the mixed solution prepared in step 2 on a cleaned glass substrate, and then place it in a vacuum drying oven for drying, thereby preparing a P1-PVA film (i.e., a room temperature phosphorescent polymer-polyvinyl alcohol film);

[0009] Step 4: Assemble the glass substrate coated with the P1-PVA film in step 3 with another glass substrate into a liquid crystal cell, and control the distance between the upper and lower glass substrates using ultraviolet light-curing glue containing silicon nanoparticles;

[0010] Step 5, injecting the chiral liquid crystal mixture prepared in step 1 into the liquid crystal box prepared in step 4 at a temperature not less than the clearing point, to obtain a room temperature phosphorescent chiral liquid crystal double-layer membrane structure (i.e., room temperature phosphorescent-soft helical superstructure-molecular motor double-layer membrane structure);

[0011] Step 6: Under the synergistic effect of light and temperature, the circularly polarized phosphorescence asymmetry factor is reversibly regulated. The specific process is as follows: the prepared room temperature phosphorescent chiral liquid crystal double-layer film structure is illuminated. As the illumination time increases, the molecular motor changes from right-handed to left-handed, the photon bandgap of the double-layer film structure red-shifts, and the circularly polarized phosphorescence asymmetry factor (g lum ) also shows a corresponding red shift phenomenon; then, when the temperature is raised to the clearing point temperature of the liquid crystal, the molecular motor changes from left-handedness to right-handedness, and the photon bandgap blue shifts.

[0012] Furthermore, in step one, in the mixture of molecular motor, chiral agent, liquid crystal monomer, photoinitiator and nematic liquid crystal, the mass fraction of the chiral agent is 25.2wt% or 20.0wt%; the mass fraction of the molecular motor is less than 10wt%; the mass fraction of the liquid crystal monomer is 5wt% to 10wt%, and the mass fraction of the photoinitiator is 0.1wt% to 1wt%.

[0013] Furthermore, in the step 1, the mass fraction of the chiral agent is 25.2wt% or 20.0wt%; the mass fraction of the molecular motor is 5wt%.

[0014] Furthermore, in the step 1, the solvent is evaporated to dryness at 70° C., and the photon bandgap range of the obtained chiral liquid crystal mixture is 520 to 700 nm.

[0015] Furthermore, in the step 2, the mass ratio of the room temperature phosphorescent polymer to the polyvinyl alcohol is 1:5.

[0016] When the mass ratio of the room temperature phosphorescent polymer to the polyvinyl alcohol is 1:5, the obtained room temperature phosphorescent polymer film has a larger luminous intensity and a higher luminous efficiency.

[0017] Furthermore, in the step 2, the heating temperature is 100-110° C., and the heating time is at least 3 hours.

[0018] Furthermore, in step three, the mixture is dried in a vacuum drying oven for at least 3 hours at a temperature of 35-50°C.

[0019] Furthermore, in the step 4, the particle size of the silicon nanoparticles is 10-40 μm.

[0020] Furthermore, in step five, the clearing point temperature is 70°C.

[0021] Beneficial effects:

[0022] (1) The present invention dopes a molecular motor into a soft superhelical structure, and constructs a room temperature phosphorescence-soft helical superstructure-molecular motor double-layer membrane system to control the flipping of the molecular motor under the action of light, thereby causing the movement of the photonic bandgap of the soft helical superstructure, and ultimately achieving dynamic regulation of the soft helical superstructure.

[0023] (2) The present invention realizes the dynamic reversible regulation of the asymmetry factor of high circular polarization room temperature phosphorescence in a soft helical superstructure for the first time by controlling light and temperature. Under UV light, the molecular motor gradually changes from right-handedness to left-handedness, the photon bandgap undergoes a red shift, and the photon bandgap of the soft helical superstructure cannot coincide well with the emission wavelength of the room temperature phosphorescent polymer, resulting in a decrease in the asymmetry factor of circular polarization luminescence; when the temperature is increased, the molecular motor can rotate around the double bond, changing from left-handedness to right-handedness, and the chirality will return to the initial state, resulting in a blue shift of the photon bandgap, and the asymmetry factor of circular polarization luminescence will increase again and can return to the initial state.

[0024] (3) The present invention has the advantages of easy preparation, high flexibility, low price and good cycle performance.

[0025] (4) At present, there is no report on the dynamic reversible control method of the asymmetric factor of circularly polarized room temperature phosphorescence of soft helical superstructures. Compared with the existing methods, the method of the present invention can achieve dynamic reversible control of the asymmetric factor of high circularly polarized phosphorescence in a circularly polarized organic room temperature phosphorescence system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a dynamic reversible regulation diagram of the circularly polarized room temperature phosphorescence asymmetry factor of the room temperature phosphorescent chiral liquid crystal double-layer film structure prepared in Example 1 when the concentration of the chiral agent (R811) is 25.2wt.%.

[0027] Figure 2 This is a dynamic reversible regulation diagram of the circularly polarized room temperature phosphorescence asymmetry factor of the room temperature phosphorescent chiral liquid crystal double-layer film structure prepared in Example 2 when the concentration of the chiral agent (R811) is 20.0wt.%.

[0028] Figure 3 The chemical structural formulas are molecular motor (M1), chiral agent (R811), liquid crystal monomer (RM257), photoinitiator (IRG651) and room temperature phosphorescent polymer (P1). DETAILED DESCRIPTION

[0029] The technical solution of the present invention is described in detail below with reference to the accompanying drawings, but the protection scope of the present invention is not limited to the embodiments.

[0030] The present invention discloses a method for dynamically reversibly regulating the asymmetric factor of circularly polarized room temperature phosphorescence of a soft helical superstructure. The method is based on the property that a molecular motor can flip its chirality under light. By controlling the light irradiation time and temperature, the photon bandgap of the soft helical superstructure is changed to achieve dynamic reversible regulation of the asymmetric factor of circularly polarized phosphorescence.

[0031] In the embodiment of the present invention, the molecular motor M1 has a molecular structure as shown in Figure 3 As shown, it is prepared by the method in reference Small Method 2022, 6, 2200269. The chiral agent R811 has a molecular structure as shown Figure 3 As shown, it comes from Nanjing Leyao Technology Co., Ltd.; the liquid crystal monomer RM257 has a molecular structure as shown Figure 3 As shown, it comes from Nanjing Leyao Technology Co., Ltd.; the photoinitiator IRG651 has a molecular structure as shown Figure 3 As shown, it comes from Nanjing Leyao Technology Co., Ltd.; the nematic liquid crystal is HNG7156, which comes from Jiangsu Hecheng New Materials Co., Ltd. The room temperature phosphorescent polymer P1, the molecular structure is as follows Figure 3 As shown, it was prepared by the method in reference Small Method 2022,6,2200269.

[0032] Example 1

[0033] A dynamic reversible control method of the asymmetric factor of circularly polarized room temperature phosphorescence based on a soft helical superstructure comprises the following steps:

[0034] (1) 58.9 mg of nematic liquid crystal (HNG7156) was doped with 5 mg of molecular motor (M1), 25.2 mg of chiral agent (R811), 10 mg of liquid crystal monomer (RM257), and 0.9 mg of photoinitiator (IRG651). The mass fraction of the chiral agent (R811) in the mixed liquid crystal system was 25.2 wt.%. The liquid crystal mixture was then dissolved in 2 mL of dichloromethane (CH2Cl2), and the solvent was evaporated at 70°C by ultrasonication to obtain a uniformly mixed chiral liquid crystal mixture.

[0035] (2) adding 100 mg of room temperature phosphorescent polymer (P1) and 500 mg of polyvinyl alcohol (PVA) to 5 mL of deionized water, and mixing them thoroughly under ultrasonication at a temperature of 110° C. for 3 h; thereby preparing a mixed solution of room temperature phosphorescent polymer and polyvinyl alcohol;

[0036] (3) The mixed solution prepared in step (2) was spin-coated on a cleaned glass substrate (the glass substrate had specifications of 20 mm (length) × 20 mm (width) × 1.1 mm (thickness)), placed in a vacuum drying oven for 12 h, and the temperature was controlled at 45° C., thereby preparing a P1-PVA film.

[0037] (4) Assemble the glass substrate coated with the P1-PVA film prepared in step (3) and another glass plate of the same size into a liquid crystal box, and the distance between the two glass substrates is controlled by a UV-curable adhesive doped with 30 μm silicon nanoparticles.

[0038] (5) Then, the chiral liquid crystal mixture prepared in step (1) is injected into the liquid crystal box prepared in step (4) at 70° C., thereby obtaining a room temperature phosphorescent chiral liquid crystal double-layer film structure.

[0039] (6) The room temperature phosphorescent chiral liquid crystal double-layer film structure obtained in step (5) is exposed to 405nm UV (power 50mW / cm 2 ) and irradiated for 0s, 10s, 30s, 50s, and 90s respectively. As the illumination time increases, the molecular motor changes from right-handed to left-handed. As the concentration of the right-handed chiral agent decreases and the pitch increases, the photon bandgap of the double-layer film structure eventually redshifts, and the circularly polarized phosphorescence asymmetry factor (g lum ) also shows a corresponding red shift phenomenon.

[0040] When the temperature rises to the clearing point of the liquid crystal (~70°C), the molecular motor rotates around the double bond, changing from right-handed to left-handed, and the photon bandgap also shifts to the blue. Therefore, under the synergistic effect of light and temperature, the circularly polarized phosphorescence asymmetry factor can be reversibly adjusted between 1.38 and 0.6 (g lum =2(I L -I R ) / (I L +I R ),I L , I R Represent the intensity of left-handed and right-handed circularly polarized light respectively; |g lum | max=2). The circularly polarized luminescence asymmetry factor can be used to describe the polarization degree and rotation direction of light. Its value range is from -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. When the absolute value of the circularly polarized luminescence asymmetry factor is closer to 2, it means that the polarization degree of light is higher.

[0041] Figure 1 This is a dynamic regulation diagram of the circularly polarized room temperature phosphorescence performance of the room temperature phosphorescent chiral liquid crystal double-layer film structure prepared when the mass fraction of R811 is 25.2wt.% in Example 1. Figure 1 The lower part of (a) is a delayed photoluminescence spectrum of a phosphorescent polymer (a room temperature phosphorescent polymer in a room temperature phosphorescent chiral liquid crystal double-layer film structure); Figure 1 The upper part of (a) shows that by changing the illumination time and temperature, the photon bandgap of the room temperature phosphorescent chiral liquid crystal double-layer film structure can be reversibly adjusted. Figure 1 (b) shows that the circularly polarized room temperature phosphorescence asymmetry factor of the room temperature phosphorescent chiral liquid crystal double-layer film structure shows a red shift as the illumination time increases. Figure 1 (c) shows the dynamic reversible regulation of the circularly polarized room temperature phosphorescence asymmetry factor of the room temperature phosphorescent chiral liquid crystal double-layer film structure under the synergistic effect of light and temperature. When the concentration of the chiral agent is 25.2wt.%, the photonic bandgap of the room temperature phosphorescent chiral liquid crystal double-layer film structure can well coincide with the emission wavelength of the room temperature phosphorescent polymer. In the absence of UV light, g lum The maximum is 1.38 ( Figure 1 ). With different illumination time, the g value can be adjusted in a wide range of 1.38-0.6.

[0042] Example 2

[0043] A dynamic reversible control method of the asymmetric factor of circularly polarized room temperature phosphorescence based on a soft helical superstructure comprises the following steps:

[0044] (1) 2.5 mg of molecular motor (M1), 10 mg of chiral agent (R811), 4.95 mg of liquid crystal monomer (RM257), and 0.05 mg of photoinitiator (IRG651) were added to 32.5 mg of nematic liquid crystal (HNG7156), and the mass fraction of chiral agent (R811) in the above mixed liquid crystal system was 20.0 wt.%. The liquid crystal mixture was then dissolved in 2 mL of dichloromethane (CH2Cl2), and the solvent was evaporated at 70°C by ultrasonication to obtain a uniform chiral liquid crystal mixture.

[0045] (2) adding 100 mg of room temperature phosphorescent polymer (P1) and 500 mg of polyvinyl alcohol (PVA) to 5 mL of deionized water, and mixing them thoroughly under ultrasonication at a temperature of 100° C. for 3.5 h; thereby preparing a mixed solution of room temperature phosphorescent polymer and polyvinyl alcohol;

[0046] (3) The mixed solution prepared in step (2) was spin-coated on a cleaned glass substrate (the specifications of the glass substrate were 20 mm (length) × 20 mm (width) × 1.1 mm (thickness)), and placed in a vacuum drying oven for 12 h at a temperature of 45° C., thereby preparing a P1-PVA film.

[0047] (4) Assemble the glass substrate coated with the P1-PVA film prepared in step (3) and another glass plate of the same size into a liquid crystal box, and the distance between the two glass substrates is controlled by UV glue doped with 30-micron silicon nanoparticles.

[0048] (5) Then, the chiral liquid crystal mixture prepared in step (1) is injected into the liquid crystal box prepared in step (4) at 70° C. through capillary action, thereby obtaining a room temperature phosphorescent chiral liquid crystal double-layer film structure.

[0049] (6) The room temperature phosphorescent chiral liquid crystal double-layer film structure obtained in step (5) is exposed to 405nm UV (power 50mW / cm 2 ) for 0s, 10s, 30s, 50s, and 90s. As time goes by, the photon bandgap of the room temperature phosphorescent chiral liquid crystal double-layer film structure redshifts, and the circularly polarized phosphorescence asymmetry factor also shows a corresponding redshift phenomenon, and keeps getting smaller. When the temperature rises to around the clearing point of the liquid crystal (~70℃), the molecular motor changes from right-handed to left-handed, the photon bandgap blueshifts, and g lum It can be reversibly adjusted between 0.46 and 0.25.

[0050] Figure 2 This is a dynamic regulation diagram of the circularly polarized room temperature phosphorescence performance of the room temperature phosphorescent chiral liquid crystal double-layer film structure when the mass fraction of R811 is 20wt.% in Example 2. Figure 2 The lower part of (a) is the delayed photoluminescence spectrum of the phosphorescent polymer. Figure 2 The upper part of (a) shows that by changing the illumination time and temperature, the photon bandgap of the room temperature phosphorescent chiral liquid crystal double-layer film structure can be reversibly adjusted. Figure 2 (b) shows that the circularly polarized room temperature phosphorescent asymmetry factor of the room temperature phosphorescent chiral liquid crystal double-layer film structure shows a red shift as the illumination time increases. Figure 2(c) is a diagram of the dynamic reversible regulation of the circularly polarized room temperature phosphorescence asymmetry factor of the room temperature phosphorescent chiral liquid crystal double-layer film structure under light and temperature. When the mass fraction of the chiral agent R811 is 20wt.%, the photon bandgap of the room temperature phosphorescent chiral liquid crystal double-layer film structure cannot overlap with the emission wavelength of the room temperature phosphorescent polymer. In the absence of UV light, g lum Reduced to 0.45 (such as Figure 2 ). With different lighting time, the g value can only be adjusted within a small range of 0.45-0.25.

[0051] When the mass fraction of the chiral agent R811 is 20wt.%, the photon bandgap of the room temperature phosphorescent chiral liquid crystal double-layer film structure cannot overlap with the luminescence spectrum of the room temperature phosphorescent polymer. In the absence of UV light, the maximum value of the circularly polarized phosphorescence asymmetry factor is only 0.46. Under the synergistic effect of light and temperature, the circularly polarized phosphorescence asymmetry factor can only be reversibly regulated between 0.45 and 0.25. When the mass fraction of the chiral agent R811 is 25.2wt.%, the photon bandgap of the room temperature phosphorescent chiral liquid crystal double-layer film structure completely overlaps with the luminescence wavelength of the room temperature phosphorescent polymer. By controlling the illumination time and temperature, the circularly polarized phosphorescence asymmetry factor can be dynamically and reversibly regulated over a large range (1.38 to 0.6). Therefore, the concentration of the chiral agent R811 can be adjusted to control the photon bandgap of the room temperature phosphorescent chiral liquid crystal double-layer film structure.

[0052] In summary, under the synergistic effect of light and temperature, the present invention can achieve dynamic reversible regulation of high circularly polarized luminescence asymmetry factor and chiral superhelical structure in the soft helical superstructure circularly polarized room temperature phosphorescence system.

[0053] 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 in form and details may be made without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A method for dynamically controlling the asymmetric factor of circularly polarized room temperature phosphorescence based on a soft helical superstructure, characterized in that: Including steps such as: Step 1, mixing a molecular motor, a chiral agent, a liquid crystal monomer, a photoinitiator, and a nematic liquid crystal, dissolving the mixture in a dichloromethane solvent, mixing well, and evaporating the solvent to obtain a chiral liquid crystal mixture; the molecular motor is M1, the chiral agent is R811, the liquid crystal monomer is RM257, the photoinitiator is IRG651, and the nematic liquid crystal is HNG7156; The structural formula of the M1 is as follows: Step 2, adding a room temperature phosphorescent polymer and polyvinyl alcohol into deionized water, mixing evenly, and heating to obtain a mixed solution of the room temperature phosphorescent polymer and polyvinyl alcohol; the room temperature phosphorescent polymer is P1; The structural formula of P1 is as follows: Step 3: Spin-coat the mixed solution prepared in step 2 on a cleaned glass substrate, and then place it in a vacuum drying oven for drying, thereby preparing a P1-PVA film; Step 4: Assemble the glass substrate coated with the P1-PVA film and another glass substrate into a liquid crystal cell, and control the distance between the upper and lower glass substrates using a UV-curable adhesive containing silicon nanoparticles; Step 5, injecting the chiral liquid crystal mixture prepared in step 1 into the liquid crystal box prepared in step 4 at a temperature not less than the clearing point, to obtain a room temperature phosphorescent chiral liquid crystal double-layer film structure; Step 6: Under the synergistic effect of light and temperature, the circularly polarized phosphorescence asymmetry factor is reversibly regulated. The specific process is as follows: The room temperature phosphorescent chiral liquid crystal double-layer film structure prepared in step five is illuminated. As the illumination time increases, the molecular motor changes from right-handed to left-handed, the photon bandgap of the double-layer film structure red-shifts, and the circularly polarized phosphorescence asymmetry factor also shows a corresponding red-shift phenomenon; then, the temperature is raised to the clearing point temperature of the liquid crystal, the molecular motor changes from left-handed to right-handed, and the photon bandgap blue-shifts.

2. The method for dynamically controlling the asymmetry factor of circularly polarized room temperature phosphorescence based on a soft helical superstructure according to claim 1, characterized in that: In the step 1, in the mixture of molecular motor, chiral agent, liquid crystal monomer, photoinitiator and nematic liquid crystal, the mass fraction of the chiral agent is 25.2wt% or 20.0wt%; the mass fraction of the molecular motor is less than 10wt%; the mass fraction of the liquid crystal monomer is 5wt% to 10wt%, and the mass fraction of the photoinitiator is 0.1wt% to 1wt%.

3. The method for dynamically controlling the asymmetry factor of circularly polarized room temperature phosphorescence based on a soft helical superstructure according to claim 1, characterized in that: In the step 1, the mass fraction of the chiral agent is 25.2wt% or 20.0wt%; the mass fraction of the molecular motor is 5wt%.

4. The method for dynamically controlling the asymmetry factor of circularly polarized room temperature phosphorescence based on a soft helical superstructure according to claim 1, characterized in that: In the step 1, the solvent is evaporated to dryness at 65° C.-70° C., and the photon bandgap range of the obtained chiral liquid crystal mixture is 520-700 nm.

5. The method for dynamically controlling the asymmetry factor of circularly polarized room temperature phosphorescence based on a soft helical superstructure according to claim 1, characterized in that: In the step 2, the mass ratio of the room temperature phosphorescent polymer to the polyvinyl alcohol is 1:

5.

6. The method for dynamically controlling the asymmetry factor of circularly polarized room temperature phosphorescence based on a soft helical superstructure according to claim 1, characterized in that: In step 2, the heating temperature is 100-110° C. and the heating time is at least 3 hours.

7. The method for dynamically controlling the asymmetry factor of circularly polarized room temperature phosphorescence based on a soft helical superstructure according to claim 1, characterized in that: In the step 3, the mixture is dried in a vacuum drying oven for at least 3 hours at a temperature of 35-50°C.

8. The method for dynamically controlling the asymmetry factor of circularly polarized room temperature phosphorescence based on a soft helical superstructure according to claim 1, characterized in that: In the step 4, the particle size of the silicon nanoparticles is 10-40 μm.

9. The method for dynamically controlling the asymmetry factor of circularly polarized room temperature phosphorescence based on a soft helical superstructure according to claim 1, characterized in that: In step 5, the clearing point temperature is 70°C.

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