CN110872458A

CN110872458A - Circular polarization luminous chiral liquid crystal ink and preparation method and application thereof

Info

Publication number: CN110872458A
Application number: CN201811001947.9A
Authority: CN
Inventors: 段鹏飞; 杨雪峰; 郭俊辰; 范鸿川
Original assignee: Beijing Institute of Nanoenergy and Nanosystems
Current assignee: National Center for Nanosccience and Technology China; Beijing Institute of Nanoenergy and Nanosystems
Priority date: 2018-08-30
Filing date: 2018-08-30
Publication date: 2020-03-10

Abstract

The invention relates to a chiral liquid crystal ink with circular polarization luminescence, a preparation method and an application thereof. The room-temperature nematic liquid crystal, the chiral molecules and the luminescent molecules contained in the chiral liquid crystal ink are combined, so that the chiral liquid crystal ink has circular polarization luminescent characteristics, and the obtained circular polarization luminescent signal has a large asymmetric factor, so that the chiral liquid crystal ink has a large application value in the aspects of chiral printing and chiral printing, and the preparation method is simple, small in environmental influence factor, low in cost and wide in application prospect.

Description

Circular polarization luminous chiral liquid crystal ink and preparation method and application thereof

Technical Field

The invention belongs to the field of circular polarization luminescence, and relates to a preparation method and application of a circular polarization luminescence chiral liquid crystal ink.

Background

The circularly polarized light contains abundant light information and has high optical sensitivity and optical resolution, so that the circularly polarized light has wide application prospects in the aspects of biological coding, circularly polarized light information encryption, 3D optical display, optical data storage, optical devices and the like, and is continuously concerned and researched by people. It has been found that certain chiral substances emit left and right circularly polarized light with different intensities when excited by incident light, and this phenomenon is called Circular Polarized Light (CPL), which characterizes the structure of the excited state of the substance. The circular polarization light emission has important application value in the aspects of processing, displaying, storing and the like of optical information.

The chiral nematic liquid crystal molecules are flat and arranged into layers, molecules in the layers are parallel to each other, the long axes of the molecules are parallel to the plane of the layers, the long axes of the molecules of different layers slightly change, and the molecules are arranged into a spiral structure along the normal direction of the layers. By adding chiral molecules to the nematic liquid crystal, the nematic liquid crystal can be induced to form chiral nematic liquid crystal. Adding light-emitting molecules to chiral nematic liquid crystals is an effective way to obtain circularly polarized light. In recent years, various novel display devices have been developed by utilizing the characteristics of chiral nematic liquid crystals such as optical rotation, selectivity, circular dichroism, and the like.

Quantum dots are semiconductor materials of nanometer scale, and the light emission wavelength of the quantum dots can be controlled by changing the size and chemical composition of the quantum dots. The quantum dots have wide absorption range and narrow emission range, and spectral overlapping is not easy to occur in the process of simultaneously using the quantum dots with various colors. In addition, quantum dots have good photostability and long fluorescence lifetime, which makes quantum dots have the potential to be used as backlights.

The halide perovskite nanocrystal is a high-performance semiconductor material, and is not only suitable for solar cells, but also suitable for light emitting diodes and lasers. Compared with hybrid organic-inorganic halides, the all-inorganic perovskite has higher stability and huge application potential in various optoelectronics. CsPbX₃Such perovskites have excellent optical properties, particularly tunable emission wavelength and high quantum yield.

Compared with the traditional organic dye and quantum dot, the lanthanide metal-doped up-conversion nano particle has the unique advantages of low toxicity, long service life, narrow luminous line, high photobleaching threshold and the like, is considered as a novel biological optical probe, and has potential application prospects in the aspects of photocatalysis, multicolor display, solar cells, biological amplification and the like.

CN107065284A discloses a quantum dot color film liquid crystal display, which includes a backlight source, a lower polarizing element, a liquid crystal layer, and a quantum dot color film for converting polarized light passing through the liquid crystal layer into full spectrum light. Through being applied to the liquid crystal display with the various membrane of quantum dot, incidenting to the various membrane of quantum dot behind the emergent light of backlight process polarizing element and liquid crystal layer down, form full spectral light, through carrying out fine adjustment to the backlight, and then promote luminance and colour gamut performance by a wide margin, let the color more bright.

CN204439978U discloses a liquid crystal module and a liquid crystal display device using quantum dots, the liquid crystal module includes a backlight system, a quantum dot optical film system and a liquid crystal panel, the backlight system includes a light source and a reflector plate, the quantum dot optical film system includes a first water oxygen barrier layer, a quantum dot layer, a second water oxygen barrier layer, a liquid crystal layer with optical activity and a 1/4 wave plate, and the liquid crystal layer is located between the second water oxygen barrier layer and 1/4 wave plate. The utility model discloses a high colour gamut can be realized to the LCD module of quantum dot, and owing to add the liquid crystal layer and the 1/4 wave plate that have the optical rotation, can also realize the blast effect.

So far, no chiral nematic liquid crystal material for obtaining circularly polarized light emission by adding quantum dots, halide perovskite nanocrystals and up-conversion nanoparticles to chiral nematic liquid crystal has been reported. Therefore, it is necessary to develop a method for preparing a chiral nematic liquid crystal material that can efficiently and generally obtain circularly polarized light emission.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide a chiral liquid crystal ink capable of emitting light by circular polarization, and a preparation method and application thereof.

In order to achieve the purpose, the invention adopts the following technical scheme:

in one aspect, the invention provides a chiral liquid crystal ink capable of circularly polarizing and emitting light, which comprises the following components: the light-emitting material comprises room-temperature nematic liquid crystal, chiral molecules and light-emitting molecules, wherein the light-emitting molecules comprise any one of quantum dots, perovskite nanocrystals or up-conversion nanoparticles.

In the present invention, the quantum dots include any one of CdSe/ZnS quantum dots or InP/ZnS quantum dots.

In the invention, the purpose of circular polarization luminescence can be finally achieved by using the achiral quantum dots.

Preferably, the CdSe/ZnS quantum dots are blue light-emitting CdSe/ZnS quantum dots (with the maximum emission wavelength of 458nm), green light-emitting CdSe/ZnS quantum dots (with the maximum emission wavelength of 524nm) or red light-emitting CdSe/ZnS quantum dots (with the maximum emission wavelength of 647 nm);

preferably, the InP/ZnS quantum dots are green light emitting InP/ZnS quantum dots (maximum emission wavelength of 520nm) or red light emitting InP/ZnS quantum dots (maximum emission wavelength of 660 nm).

In the present invention, the perovskite nanocrystal comprises CsPbCl₃、CsPbBr₃Or CsPbI₃Any one of them.

Wherein, the CsPbCl₃Is a blue light emitting perovskite nanocrystal, CsPbBr₃Is a green emitting perovskite nanocrystal, CsPbI₃Is a red light emitting perovskite nanocrystal.

The upconversion nanoparticles include NaYF₄Yb, Tm or NaYF₄Any one of Yb and Er. Wherein NaYF₄The up-conversion nano particles are formed by taking Yb as a sensitizer and taking Tm or Er as an activator.

Preferably, the up-conversion nanoparticles are blue light emitting NaYF₄Yb, Tm (maximum emission wavelength of 475nm) or green-emitting NaYF₄Yb, Er (maximum emission wavelength of 545 nm).

In the invention, the room-temperature nematic liquid crystal comprises any one of SLC1717, 5CB or MBBA.

Preferably, the chiral molecule comprises S811 or R811.

In the present invention, the chiral molecules account for 1 to 40% of the mass of the room-temperature nematic liquid crystal, for example, 1%, 2%, 5%, 10%, 16%, 21%, 26%, 30%, 32.5%, 35.8%, 40%.

Preferably, when the room-temperature nematic liquid crystal is 5CB, the chiral molecules account for 1% of the mass of the room-temperature nematic liquid crystal.

Preferably, when the room-temperature nematic liquid crystal is MBBA, the chiral molecules account for 2% of the mass of the room-temperature nematic liquid crystal.

Preferably, when the room temperature nematic liquid crystal is SLC1717, the chiral molecules account for 26% of the mass of the room temperature nematic liquid crystal when the luminescent molecules are red light emitting CdSe/ZnS quantum dots.

Preferably, when the room temperature nematic liquid crystal is SLC1717, the light-emitting molecules are green light-emitting CdSe/ZnS quantum dots, green light-emitting InP/ZnS quantum dots or CsPbBr₃When the chiral molecules occupy 32.5% of the mass of the room-temperature nematic liquid crystal.

Preferably, when the room temperature nematic liquid crystal is SLC1717, the light-emitting molecules are blue light-emitting CdSe/ZnS quantum dots and blue light-emitting NaYF₄The mass of the chiral molecules accounts for 35.8 percent of the mass of the room-temperature nematic liquid crystal at Yb and Tm.

Preferably, when the room temperature nematic liquid crystal is SLC1717, the luminescent molecules are red light emitting InP/ZnS quantum dots and CsPbI₃When the chiral molecules occupy 21% of the mass of the room-temperature nematic liquid crystal.

Preferably, when the room temperature nematic liquid crystal is SLC1717, the light emitting molecules are green light emitting NaYF₄Yb and Er, the chiral molecules account for 30 percent of the mass of the room-temperature nematic liquid crystal.

Preferably, when the room temperature nematic liquid crystal is SLC1717, the light emitting molecule is CsPbCl₃When the chiral molecules account for 40% of the mass of the room temperature nematic liquid crystal.

Preferably, the luminescent molecules account for 2% of the mass of the room-temperature nematic liquid crystal.

In the invention, the circular polarization luminescence properties of the quantum dots, the perovskite nanocrystals and the up-conversion nanoparticles can be exerted.

In the present invention, the terms "blue light emitting", "green light emitting" and "red light emitting" respectively mean that the corresponding quantum dots emit blue light, green light or red light.

In another aspect, the present invention further provides a method for preparing the above-mentioned chiral liquid crystal ink with circularly polarized light emission, comprising the following steps:

uniformly mixing the room-temperature nematic liquid crystal, the chiral molecules and the luminescent molecules in an organic solvent to obtain a mixed solution, and removing the solvent in the mixed solution to obtain the circularly polarized luminescent chiral liquid crystal ink.

Preferably, the organic solvent is toluene, and other solvents that do not decompose the upconversion nanoparticles, perovskite nanocrystals, and quantum dot structures may be used.

Preferably, the concentration of the light-emitting molecule in the organic solvent is 1-30mg/mL, such as 1mg/mL, 3mg/mL, 5mg/mL, 8mg/mL, 10mg/mL, 12mg/mL, 15mg/mL, 18mg/mL, 20mg/mL, 23mg/mL, 25mg/mL, 28mg/mL, or 30 mg/mL.

Preferably, when the light-emitting molecule is a quantum dot, its concentration in the organic solvent is 1-30mg/mL, such as 1mg/mL, 3mg/mL, 5mg/mL, 8mg/mL, 10mg/mL, 12mg/mL, 15mg/mL, 18mg/mL, 20mg/mL, 23mg/mL, 25mg/mL, 28mg/mL or 30mg/mL, preferably 10 mg/mL.

Preferably, when the luminescent molecule is a perovskite nanocrystal, its concentration in the organic solvent is 1-30mg/mL, such as 1mg/mL, 3mg/mL, 5mg/mL, 8mg/mL, 10mg/mL, 12mg/mL, 15mg/mL, 18mg/mL, 20mg/mL, 23mg/mL, 25mg/mL, 28mg/mL or 30mg/mL, preferably 5.5 mg/mL.

Preferably, when the luminescent molecule is an up-converting nanoparticle, its concentration in the organic solvent is 1-30mg/mL, such as 1mg/mL, 3mg/mL, 5mg/mL, 8mg/mL, 10mg/mL, 12mg/mL, 15mg/mL, 18mg/mL, 20mg/mL, 23mg/mL, 25mg/mL, 28mg/mL or 30mg/mL, preferably 10 mg/mL.

Preferably, the concentration of the room temperature nematic liquid crystal in the organic solvent is 0.1-20mg/mL, such as 0.1mg/mL, 0.5mg/mL, 1mg/mL, 3mg/mL, 5mg/mL, 8mg/mL, 10mg/mL, 12mg/mL, 15mg/mL, 18mg/mL, 20mg/mL, preferably 10 mg/mL.

Preferably, the concentration of the chiral molecule in the organic solvent is 0.1-10mg/mL, such as 0.1mg/mL, 0.5mg/mL, 1mg/mL, 3mg/mL, 5mg/mL, 8mg/mL, or 10mg/mL, preferably 1 mg/mL.

In the invention, the concentrations of the selected quantum dots, the perovskite nanocrystals and the up-conversion nanoparticles are not suitable to be too high, and if the concentrations are too high, the quantum dots cannot be well dispersed in a solvent; the liquid crystal and the chiral molecules are not easy to be excessively concentrated, so that the liquid crystal and the chiral molecules cannot be separated out in a solvent.

Preferably, the solvent in the mixed solution is removed by heating to evaporate the solvent.

In the present invention, the perovskite nanocrystals may be prepared by methods known in the art, for example, the preparation method may be:

5mL of octadecene, 0.25mL of oleic acid and 0.25mL of oleylamine were mixed uniformly to obtain a mixed solvent (preparation of CsPbCl)₃0.25mL of trioctylphosphine is added), 0.05mmol of Cs is added₂CO₃And 0.15mmol of PbX₂(X ═ Cl, Br, I); performing tip ultrasonic treatment on the mixed solution, wherein the ultrasonic power is 30W, and the time is 10 min; centrifuging at 9000r/min for 10min to remove unreacted raw materials; and dispersing the prepared perovskite nanocrystalline in 6mL of n-hexane, and centrifuging at the rotating speed of 2000r/min for 10min to obtain the n-hexane dispersion liquid of the perovskite nanocrystalline.

Preferably, the n-hexane dispersion of the perovskite nanocrystal is 5.5 mg/mL. However, the method is not limited to the above-mentioned values, and dispersion solutions having other concentrations can be obtained by adjusting the preparation conditions.

In another aspect, the present invention provides the use of the circularly polarized luminescent chiral liquid crystal ink as described above in chiral printing or chiral printing.

Compared with the prior art, the invention has the following beneficial effects:

the room-temperature nematic liquid crystal, the chiral molecules and the luminescent molecules contained in the chiral liquid crystal ink are combined, so that the prepared chiral liquid crystal ink has a circular polarization luminescent characteristic, and the obtained circular polarization luminescent signal has a large asymmetric factor, namely, pure single-chiral circular polarized light can be obtained, so that the chiral ink has a large application value in the aspects of chiral printing and chiral printing, and the preparation method is simple, small in environmental influence factor, low in cost and wide in application prospect.

Drawings

FIG. 1 is a circular polarization luminescence spectrum of a chiral liquid crystal ink of circular polarization luminescence with 5CB as a room temperature nematic liquid crystal, R811 and S811 as chiral molecules, and CdSe/ZnS quantum dots (maximum luminescence wavelength of 458nm) for blue light emission as luminescent molecules;

FIG. 2 is a circular polarized luminescence spectrum of a chiral liquid crystal ink of circular polarized luminescence with 5CB as a room temperature nematic liquid crystal, R811 and S811 as chiral molecules, and CdSe/ZnS quantum dots (maximum luminescence wavelength of 524nm) emitting green light as luminescent molecules;

FIG. 3 is a circular polarized luminescence spectrum of a chiral liquid crystal ink of circular polarized luminescence with 5CB as a room temperature nematic liquid crystal, R811 and S811 as chiral molecules, and CdSe/ZnS quantum dots emitting red light (with a maximum luminescence wavelength of 647nm) as luminescent molecules;

FIG. 4 is a circular polarization luminescence spectrum of a chiral liquid crystal ink of circular polarization luminescence with 5CB as a room temperature nematic liquid crystal, R811 and S811 as chiral molecules, and InP/ZnS quantum dots (maximum luminescence wavelength of 520nm) for green emission as luminescent molecules;

FIG. 5 is a circular polarization luminescence spectrum of a chiral liquid crystal ink of circular polarization luminescence with 5CB as a room temperature nematic liquid crystal, R811 and S811 as chiral molecules, and InP/ZnS quantum dots (maximum luminescence wavelength of 660nm) for red light emission as luminescent molecules;

FIG. 6 shows NaYF with blue light emission using 5CB as the room temperature nematic liquid crystal, R811 and S811 as the chiral molecules₄Yb, Tm (maximum emission wavelength of 475nm) as a circular polarized luminescence spectrum of a chiral liquid crystal ink of circular polarized luminescence of a luminescent molecule;

FIG. 7 shows NaYF with green emission, with 5CB as the room temperature nematic liquid crystal, R811 and S811 as the chiral molecules₄A circular polarized luminescence spectrum of a chiral liquid crystal ink of circular polarized luminescence of Yb, Er (maximum emission wavelength of 545nm) as luminescent molecules;

FIG. 8 shows a nematic liquid crystal of 5CB as a room temperature, R811 and S811 as chiral molecules, and CsPbCl₃A circularly polarized luminescence spectrum of the chiral liquid crystal ink as circularly polarized luminescence of the luminescent molecules;

FIG. 9 shows a nematic liquid crystal of 5CB as a room temperature, R811 and S811 as chiral molecules, and CsPbBr₃A circularly polarized luminescence spectrum of the chiral liquid crystal ink as circularly polarized luminescence of the luminescent molecules;

FIG. 10 is a circular polarization luminescence spectrum of a chiral liquid crystal ink of circular polarization luminescence with SLC1717 as a room temperature nematic liquid crystal, R811 and S811 as chiral molecules, and CdSe/ZnS quantum dots (maximum luminescence wavelength of 458nm) for blue light emission as luminescent molecules;

FIG. 11 is a circular polarization luminescence spectrum of a chiral liquid crystal ink of circular polarization luminescence with SLC1717 as a room temperature nematic liquid crystal, R811 and S811 as chiral molecules, and CdSe/ZnS quantum dots (maximum luminescence wavelength of 524nm) for green emission as luminescent molecules;

FIG. 12 is a circular polarization luminescence spectrum of a chiral liquid crystal ink of circular polarization luminescence with SLC1717 as a room temperature nematic liquid crystal, R811 and S811 as chiral molecules, and CdSe/ZnS quantum dots (with a maximum luminescence wavelength of 647nm) emitting red light as luminescent molecules;

FIG. 13 is a circular polarization luminescence spectrum of a chiral liquid crystal ink of circular polarization luminescence with SLC1717 as a room temperature nematic liquid crystal, R811 and S811 as chiral molecules, and InP/ZnS quantum dots (maximum luminescence wavelength of 520nm) for green emission as luminescent molecules;

FIG. 14 is a circular polarization luminescence spectrum of a chiral liquid crystal ink of circular polarization luminescence with SLC1717 as a room temperature nematic liquid crystal, R811 and S811 as chiral molecules, and InP/ZnS quantum dots emitting red light (maximum luminescence wavelength of 660nm) as luminescent molecules;

FIG. 15 shows NaYF with SLC1717 as the room temperature nematic liquid crystal, R811 and S811 as the chiral molecules, and blue light emission₄Yb, Tm (maximum emission wavelength of 475nm) as a circular polarized luminescence spectrum of a chiral liquid crystal ink of circular polarized luminescence of a luminescent molecule;

FIG. 16 shows NaYF with SLC1717 as the room temperature nematic liquid crystal, R811 and S811 as the chiral molecules, and green emission₄A circular polarized luminescence spectrum of a chiral liquid crystal ink of circular polarized luminescence of Yb, Er (maximum emission wavelength of 545nm) as luminescent molecules;

FIG. 17 shows SLC1717 as a room temperature nematic liquid crystal, R811 and S811 as chiral molecules, and CsPbCl₃A circularly polarized luminescence spectrum of the chiral liquid crystal ink as circularly polarized luminescence of the luminescent molecules;

FIG. 18 shows SLC1717 as a room temperature nematic liquid crystal, R811 and S811 as chiral molecules, and CsPbBr₃A circularly polarized luminescence spectrum of the chiral liquid crystal ink as circularly polarized luminescence of the luminescent molecules;

FIG. 19 shows SLC1717 as a room temperature nematic liquid crystal, R811 and S811 as chiral molecules, and CsPbI₃A circularly polarized luminescence spectrum of the chiral liquid crystal ink as circularly polarized luminescence of the luminescent molecules;

FIG. 20 is a circular polarized luminescence spectrum of a chiral liquid crystal ink of circular polarized luminescence with MBBA as a room temperature nematic liquid crystal, R811 and S811 as chiral molecules, and CdSe/ZnS quantum dots (maximum luminescence wavelength of 458nm) for blue light emission as luminescent molecules;

FIG. 21 is a circular polarized luminescence spectrum of a chiral liquid crystal ink of circular polarized luminescence with MBBA as a room temperature nematic liquid crystal, R811 and S811 as chiral molecules, and CdSe/ZnS quantum dots (maximum luminescence wavelength of 524nm) emitting green light as luminescent molecules;

FIG. 22 is a circular polarized luminescence spectrum of a chiral liquid crystal ink of circular polarized luminescence with MBBA as a room temperature nematic liquid crystal, R811 and S811 as chiral molecules, and CdSe/ZnS quantum dots emitting red light (the maximum luminescence wavelength is 647nm) as luminescent molecules;

FIG. 23 is a circular polarized luminescence spectrum of a chiral liquid crystal ink of circular polarized luminescence with MBBA as a room temperature nematic liquid crystal, R811 and S811 as chiral molecules, and InP/ZnS quantum dots (maximum luminescence wavelength of 520nm) for green emission as luminescent molecules;

FIG. 24 is a circular polarized luminescence spectrum of a chiral liquid crystal ink of circular polarized luminescence with MBBA as a room temperature nematic liquid crystal, R811 and S811 as chiral molecules, and InP/ZnS quantum dots emitting red light (maximum luminescence wavelength of 660nm) as luminescent molecules;

FIG. 25 shows NaYF with blue light emission using MBBA as the room temperature nematic liquid crystal, R811 and S811 as the chiral molecules₄Yb, Tm (maximum emission wavelength of 475nm) as a circular polarized luminescence spectrum of a chiral liquid crystal ink of circular polarized luminescence of a luminescent molecule;

FIG. 26 shows NaYF with green emission using MBBA as the room temperature nematic liquid crystal, R811 and S811 as the chiral molecules₄A circular polarized luminescence spectrum of a chiral liquid crystal ink of circular polarized luminescence of Yb, Er (maximum emission wavelength of 545nm) as luminescent molecules;

FIG. 27 shows MBBA as a room temperature nematic liquid crystal, R811 and S811 as chiral molecules, and CsPbBr₃A circularly polarized luminescence spectrum of a chiral liquid crystal ink as circularly polarized luminescence of luminescent molecules.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.

Example 1

The embodiment provides two kinds of chiral liquid crystal ink with circularly polarized luminescence, and the chiral liquid crystal ink comprises the following components: the liquid crystal comprises room-temperature nematic liquid crystal, chiral molecules and luminescent molecules, wherein the room-temperature nematic liquid crystal is 5CB, the chiral molecules are R811 and S811 respectively, and the luminescent molecules are CdSe/ZnS quantum dots emitting blue light.

The preparation method comprises the following steps:

uniformly mixing the room-temperature nematic liquid crystal 5CB, the chiral molecules R811 and the luminescent molecules CdSe/ZnS quantum dots in toluene to obtain a mixed solution, and removing the toluene in the mixed solution to obtain the chiral liquid crystal ink.

Repeating the steps, and only replacing the chiral molecules R811 with the chiral molecules S811 to prepare another chiral liquid crystal ink.

Light with the wavelength of 360nm is used as excitation wavelength, the two mixed systems are respectively excited, CPL test is carried out, wherein positive CPL signals are obtained when the chiral molecule is S811, negative CPL signals are obtained when the chiral molecule is R811, mirror symmetry is realized, and the result is shown in figure 1.

Example 2

The embodiment provides two kinds of chiral liquid crystal ink with circularly polarized luminescence, and the chiral liquid crystal ink comprises the following components: the liquid crystal material comprises room-temperature nematic liquid crystal, chiral molecules and luminescent molecules, wherein the room-temperature nematic liquid crystal is 5CB, the chiral molecules are R811 and S811 respectively, and the luminescent molecules are CdSe/ZnS quantum dots emitting green light.

The preparation method comprises the following steps:

uniformly mixing room-temperature nematic liquid crystal 5CB, chiral molecules R811 and luminescent molecules CdSe/ZnS quantum dots in toluene to obtain a mixed solution, wherein the concentration of the room-temperature nematic liquid crystal in an organic solvent is 10mg/mL, the concentration of the chiral molecules in the organic solvent is 1mg/mL, the concentration of the luminescent molecules in the organic solvent is 10mg/mL, and removing the toluene in the mixed solution to obtain the chiral liquid crystal ink.

Light with the wavelength of 360nm is used as excitation wavelength, the two mixed systems are respectively excited, CPL test is carried out, wherein positive CPL signals are obtained when the chiral molecule is S811, negative CPL signals are obtained when the chiral molecule is R811, mirror symmetry is realized, and the result is shown in figure 2.

Example 3

The embodiment provides two kinds of chiral liquid crystal ink with circularly polarized luminescence, and the chiral liquid crystal ink comprises the following components: the light-emitting material comprises room-temperature nematic liquid crystal, chiral molecules and luminescent molecules, wherein the room-temperature nematic liquid crystal is 5CB, the chiral molecules are R811 and S811 respectively, and the luminescent molecules are CdSe/ZnS quantum dots emitting red light.

The preparation method comprises the following steps:

Light with the wavelength of 360nm is used as excitation wavelength, the two mixed systems are respectively excited, CPL test is carried out, wherein positive CPL signals are obtained when the chiral molecule is S811, negative CPL signals are obtained when the chiral molecule is R811, mirror symmetry is realized, and the result is shown in figure 3.

Example 4

The embodiment provides two kinds of chiral liquid crystal ink with circularly polarized luminescence, and the chiral liquid crystal ink comprises the following components: the light-emitting material comprises room-temperature nematic liquid crystal, chiral molecules and light-emitting molecules, wherein the room-temperature nematic liquid crystal is 5CB, the chiral molecules are R811 and S811 respectively, and the light-emitting molecules are InP/ZnS quantum dots emitting green light.

The preparation method comprises the following steps:

uniformly mixing room-temperature nematic liquid crystal 5CB, chiral molecules R811 and luminescent molecules InP/ZnS quantum dots in toluene to obtain a mixed solution, wherein the concentration of the room-temperature nematic liquid crystal in an organic solvent is 10mg/mL, the concentration of the chiral molecules in the organic solvent is 1mg/mL, the concentration of the luminescent molecules in the organic solvent is 10mg/mL, and removing the toluene in the mixed solution to obtain the chiral liquid crystal ink.

Light with the wavelength of 360nm is used as excitation wavelength, the two mixed systems are respectively excited, CPL test is carried out, wherein positive CPL signals are obtained when the chiral molecule is S811, negative CPL signals are obtained when the chiral molecule is R811, mirror symmetry is realized, and the result is shown in figure 4.

Example 5

The embodiment provides two kinds of chiral liquid crystal ink with circularly polarized luminescence, and the chiral liquid crystal ink comprises the following components: the light-emitting material comprises room-temperature nematic liquid crystal, chiral molecules and light-emitting molecules, wherein the room-temperature nematic liquid crystal is 5CB, the chiral molecules are R811 and S811 respectively, and the light-emitting molecules are InP/ZnS quantum dots emitting red light.

The preparation method comprises the following steps:

Light with the wavelength of 360nm is used as excitation wavelength, the two mixed systems are respectively excited, CPL test is carried out, wherein positive CPL signals are obtained when the chiral molecule is S811, negative CPL signals are obtained when the chiral molecule is R811, mirror symmetry is realized, and the result is shown in figure 5.

Example 6

The embodiment provides two kinds of chiral liquid crystal ink with circularly polarized luminescence, and the chiral ink comprises the following components: the liquid crystal comprises room-temperature nematic liquid crystal, chiral molecules and luminescent molecules, wherein the room-temperature nematic liquid crystal is 5CB, the chiral molecules are R811 and S811 respectively, and the luminescent molecules are NaYF emitted by blue light₄:Yb,Tm。

The preparation method comprises the following steps:

the room temperature nematic liquid crystal 5CB, the chiral molecule R811 and the luminescent molecule NaYF₄Yb, Tm are mixed homogeneously in toluene to obtain a mixtureAnd (3) mixing the liquid crystal, wherein the concentration of the room-temperature nematic liquid crystal in the organic solvent is 10mg/mL, the concentration of the chiral molecules in the organic solvent is 1mg/mL, the concentration of the luminescent molecules in the organic solvent is 10mg/mL, and removing the toluene in the mixed liquid to obtain the chiral liquid crystal ink.

The two mixed systems are respectively excited by using light with the wavelength of 980nm as excitation wavelength to carry out CPL test, wherein a positive CPL signal is obtained when the chiral molecule is S811, and a negative CPL signal is obtained when the chiral molecule is R811, and the results are shown in figure 6.

Example 7

The embodiment provides two kinds of chiral liquid crystal ink with circularly polarized luminescence, and the chiral liquid crystal ink comprises the following components: the liquid crystal display panel comprises room-temperature nematic liquid crystal, chiral molecules and luminescent molecules, wherein the room-temperature nematic liquid crystal is 5CB, the chiral molecules are R811 and S811 respectively, and the luminescent molecules are NaYF emitted by green light₄:Yb,Er。

The preparation method comprises the following steps:

the room temperature nematic liquid crystal 5CB, the chiral molecule R811 and the luminescent molecule NaYF₄Yb and Er are uniformly mixed in toluene to obtain a mixed solution, wherein the concentration of the room-temperature nematic liquid crystal in an organic solvent is 10mg/mL, the concentration of the chiral molecules in the organic solvent is 1mg/mL, the concentration of the luminescent molecules in the organic solvent is 10mg/mL, and then the toluene in the mixed solution is removed to obtain the chiral liquid crystal ink.

The two mixed systems are respectively excited by using light with the wavelength of 980nm as excitation wavelength to carry out CPL test, wherein positive CPL signals are obtained when the chiral molecule is S811, and negative CPL signals are obtained when the chiral molecule is R811, and the results are shown in figure 7.

Example 8

The embodiment provides two kinds of chiral liquid crystal ink with circularly polarized luminescence, and the chiral liquid crystal ink comprises the following components: the liquid crystal comprises room-temperature nematic liquid crystal, chiral molecules and luminescent molecules, wherein the room-temperature nematic liquid crystal is 5CB, the chiral molecules are R811 and S811 respectively, and the luminescent molecules are CsPbCl₃。

The preparation method comprises the following steps:

the room temperature nematic liquid crystal 5CB, the chiral molecule R811 and the luminescent molecule CsPbCl₃And uniformly mixing the nematic liquid crystal in toluene to obtain a mixed solution, wherein the concentration of the room-temperature nematic liquid crystal in the organic solvent is 10mg/mL, the concentration of the chiral molecules in the organic solvent is 1mg/mL, and the concentration of the luminescent molecules in the organic solvent is 5.5mg/mL, and removing the toluene in the mixed solution to obtain the chiral liquid crystal ink.

Light with the wavelength of 360nm is used as excitation wavelength, the two mixed systems are respectively excited, and CPL test is carried out, wherein positive CPL signals are obtained when the chiral molecule is S811, and negative CPL signals are obtained when the chiral molecule is R811, and the results are shown in figure 8.

Example 9

The embodiment provides two kinds of chiral liquid crystal ink with circularly polarized luminescence, and the chiral liquid crystal ink comprises the following components: the liquid crystal comprises room-temperature nematic liquid crystal, chiral molecules and luminescent molecules, wherein the room-temperature nematic liquid crystal is 5CB, the chiral molecules are R811 and S811 respectively, and the luminescent molecules are CsPbBr₃。

The preparation method comprises the following steps:

the room temperature nematic liquid crystal 5CB, the chiral molecule R811 and the luminescent molecule CsPbBr₃And uniformly mixing the nematic liquid crystal in toluene to obtain a mixed solution, wherein the concentration of the room-temperature nematic liquid crystal in the organic solvent is 10mg/mL, the concentration of the chiral molecules in the organic solvent is 1mg/mL, and the concentration of the luminescent molecules in the organic solvent is 5.5mg/mL, and removing the toluene in the mixed solution to obtain the chiral liquid crystal ink.

Light with the wavelength of 360nm is used as an excitation wavelength, the two mixed systems are respectively excited, and CPL test is carried out, wherein a positive CPL signal is obtained when the chiral molecule is S811, and a negative CPL signal is obtained when the chiral molecule is R811, and the results are shown in figure 9.

Example 10

The embodiment provides two kinds of chiral liquid crystal ink with circularly polarized luminescence, and the chiral liquid crystal ink comprises the following components: the liquid crystal comprises room-temperature nematic liquid crystal, chiral molecules and luminescent molecules, wherein the room-temperature nematic liquid crystal is SLC1717, the chiral molecules are R811 and S811 respectively, and the luminescent molecules are CdSe/ZnS quantum dots emitting blue light.

The preparation method comprises the following steps:

uniformly mixing room-temperature nematic liquid crystal SLC1717, chiral molecules R811 and luminescent molecules CdSe/ZnS quantum dots in toluene to obtain a mixed solution, wherein the concentration of the room-temperature nematic liquid crystal in an organic solvent is 10mg/mL, the concentration of the chiral molecules in the organic solvent is 1mg/mL, the concentration of the luminescent molecules in the organic solvent is 10mg/mL, and removing the toluene in the mixed solution to obtain the chiral liquid crystal ink.

Light with the wavelength of 360nm is used as an excitation wavelength, the two mixed systems are respectively excited, and CPL test is carried out, wherein a positive CPL signal is obtained when the chiral molecule is S811, and a negative CPL signal is obtained when the chiral molecule is R811, and the results are shown in the attached figure 10.

Example 11

The embodiment provides two kinds of chiral liquid crystal ink with circularly polarized luminescence, and the chiral liquid crystal ink comprises the following components: the liquid crystal comprises room-temperature nematic liquid crystal, chiral molecules and luminescent molecules, wherein the room-temperature nematic liquid crystal is SLC1717, the chiral molecules are R811 and S811 respectively, and the luminescent molecules are CdSe/ZnS quantum dots emitting green light.

The preparation method comprises the following steps:

Light with the wavelength of 360nm is used as an excitation wavelength to excite the two mixed systems respectively to perform CPL test, wherein a positive CPL signal is obtained when the chiral molecule is S811, and a negative CPL signal is obtained when the chiral molecule is R811, and the results are shown in the attached figure 11.

Example 12

The embodiment provides two kinds of chiral liquid crystal ink with circularly polarized luminescence, and the chiral liquid crystal ink comprises the following components: the liquid crystal comprises room-temperature nematic liquid crystal, chiral molecules and luminescent molecules, wherein the room-temperature nematic liquid crystal is SLC1717, the chiral molecules are R811 and S811 respectively, and the luminescent molecules are CdSe/ZnS quantum dots emitting red light.

The preparation method comprises the following steps:

Light with the wavelength of 360nm is used as an excitation wavelength, the two mixed systems are respectively excited, and CPL test is carried out, wherein a positive CPL signal is obtained when the chiral molecule is S811, and a negative CPL signal is obtained when the chiral molecule is R811, and the results are shown in figure 12.

Example 13

The embodiment provides two kinds of chiral liquid crystal ink with circularly polarized luminescence, and the chiral liquid crystal ink comprises the following components: the liquid crystal comprises room-temperature nematic liquid crystal, chiral molecules and luminescent molecules, wherein the room-temperature nematic liquid crystal is SLC1717, the chiral molecules are R811 and S811 respectively, and the luminescent molecules are InP/ZnS quantum dots emitting green light.

The preparation method comprises the following steps:

uniformly mixing room-temperature nematic liquid crystal SLC1717, chiral molecules R811 and luminescent molecules InP/ZnS quantum dots in toluene to obtain a mixed solution, wherein the concentration of the room-temperature nematic liquid crystal in an organic solvent is 10mg/mL, the concentration of the chiral molecules in the organic solvent is 1mg/mL, the concentration of the luminescent molecules in the organic solvent is 10mg/mL, and removing the toluene in the mixed solution to obtain the chiral liquid crystal ink.

Light with the wavelength of 360nm is used as an excitation wavelength to excite the two mixed systems respectively to perform CPL test, wherein a positive CPL signal is obtained when the chiral molecule is S811, and a negative CPL signal is obtained when the chiral molecule is R811, and the results are shown in figure 13.

Example 14

The embodiment provides two kinds of chiral liquid crystal ink with circularly polarized luminescence, and the chiral liquid crystal ink comprises the following components: the light-emitting material comprises room-temperature nematic liquid crystal, chiral molecules and light-emitting molecules, wherein the room-temperature nematic liquid crystal is SLC1717, the chiral molecules are R811 and S811 respectively, and the light-emitting molecules are InP/ZnS quantum dots emitting red light.

The preparation method comprises the following steps:

uniformly mixing room-temperature nematic liquid crystal SLC1717, chiral molecules R811 and luminescent molecules InP/ZnS quantum dots in toluene to obtain a mixed solution, wherein the concentration of the room-temperature nematic liquid crystal in an organic solvent is 15mg/mL, the concentration of the chiral molecules in the organic solvent is 5mg/mL, the concentration of the luminescent molecules in the organic solvent is 15mg/mL, and removing the toluene in the mixed solution to obtain the chiral liquid crystal ink.

Light with the wavelength of 360nm is used as an excitation wavelength to excite the two mixed systems respectively to carry out CPL test, wherein positive CPL signals are obtained when the chiral molecule is S811, and negative CPL signals are obtained when the chiral molecule is R811, and the results are shown in figure 14.

Example 15

The embodiment provides two kinds of chiral liquid crystal ink with circularly polarized luminescence, and the chiral liquid crystal ink comprises the following components: the liquid crystal display comprises room-temperature nematic liquid crystal, chiral molecules and luminescent molecules, wherein the room-temperature nematic liquid crystal is SLC1717, the chiral molecules are R811 and S811 respectively, and the luminescent molecules are NaYF emitted by blue light₄:Yb,Tm。

The preparation method comprises the following steps:

mixing room temperature nematic liquid crystal SLC1717, chiral molecule R811 and luminescent molecule NaYF₄Yb and Tm are uniformly mixed in toluene to obtain a mixed solution, wherein the concentration of the room-temperature nematic liquid crystal in an organic solvent is 10mg/mL, the concentration of chiral molecules in the organic solvent is 1mg/mL, and the concentration of luminescent molecules in the organic solvent is 10mg/mL, and then the toluene in the mixed solution is removed to obtain the chiral liquid crystal ink.

The two mixed systems are respectively excited by using light with the wavelength of 980nm as excitation wavelength to carry out CPL test, wherein a positive CPL signal is obtained when the chiral molecule is S811, and a negative CPL signal is obtained when the chiral molecule is R811, and the results are shown in figure 15.

Example 16

The embodiment provides two kinds of chiral liquid crystal ink with circularly polarized luminescence, and the chiral liquid crystal ink comprises the following components: the liquid crystal display comprises room-temperature nematic liquid crystal, chiral molecules and luminescent molecules, wherein the room-temperature nematic liquid crystal is SLC1717, the chiral molecules are R811 and S811 respectively, and the luminescent molecules are NaYF emitted by green light₄:Yb,Er。

The preparation method comprises the following steps:

mixing room temperature nematic liquid crystal SLC1717, chiral molecule R811 and luminescent molecule NaYF₄Yb and Er are uniformly mixed in toluene to obtain a mixed solution, wherein the concentration of the room-temperature nematic liquid crystal in an organic solvent is 10mg/mL, the concentration of the chiral molecules in the organic solvent is 1mg/mL, the concentration of the luminescent molecules in the organic solvent is 10mg/mL, and then the toluene in the mixed solution is removed to obtain the chiral liquid crystal ink.

The two mixed systems are respectively excited by using light with the wavelength of 980nm as excitation wavelength to carry out CPL test, wherein a positive CPL signal is obtained when the chiral molecule is S811, and a negative CPL signal is obtained when the chiral molecule is R811, and the results are shown in figure 16.

Example 17

The embodiment provides two kinds of chiral liquid crystal ink with circularly polarized luminescence, and the chiral liquid crystal ink comprises the following components: the liquid crystal comprises room-temperature nematic liquid crystal, chiral molecules and luminescent molecules, wherein the room-temperature nematic liquid crystal is SLC1717, the chiral molecules are R811 and S811 respectively, and the luminescent molecules are CsPbCl₃。

The preparation method comprises the following steps:

mixing room temperature nematic liquid crystal SLC1717, chiral molecule R811 and luminescent molecule CsPbCl₃Uniformly mixing the nematic liquid crystal in toluene to obtain a mixed solution, wherein the concentration of the room-temperature nematic liquid crystal in an organic solvent is 10mg/mL, the concentration of a chiral molecule in the organic solvent is 1mg/mL, and the concentration of a luminescent molecule in the organic solvent is 10mg/mL, and then mixing the nematic liquid crystal and the organic solvent together to obtain the mixed solutionAnd removing the toluene in the mixed solution to obtain the chiral liquid crystal ink.

Light with the wavelength of 360nm is used as an excitation wavelength, the two mixed systems are respectively excited, and CPL test is carried out, wherein a positive CPL signal is obtained when the chiral molecule is S811, and a negative CPL signal is obtained when the chiral molecule is R811, and the result is shown in figure 17.

Example 18

The embodiment provides two kinds of chiral liquid crystal ink with circularly polarized luminescence, and the chiral liquid crystal ink comprises the following components: the liquid crystal comprises room-temperature nematic liquid crystal, chiral molecules and luminescent molecules, wherein the room-temperature nematic liquid crystal is SLC1717, the chiral molecules are R811 and S811 respectively, and the luminescent molecules are CsPbBr₃。

The preparation method comprises the following steps:

mixing room temperature nematic liquid crystal SLC1717, chiral molecule R811 and luminescent molecule CsPbBr₃Uniformly mixing the nematic liquid crystal in toluene to obtain a mixed solution, wherein the concentration of the room-temperature nematic liquid crystal in the organic solvent is 20mg/mL, the concentration of the chiral molecules in the organic solvent is 10mg/mL, and the concentration of the luminescent molecules in the organic solvent is 5mg/mL, and removing the toluene in the mixed solution to obtain the chiral liquid crystal ink.

Light with the wavelength of 360nm is used as an excitation wavelength to excite the two mixed systems respectively to perform CPL test, wherein a positive CPL signal is obtained when the chiral molecule is S811, and a negative CPL signal is obtained when the chiral molecule is R811, and the results are shown in figure 18.

Example 19

The embodiment provides two kinds of chiral liquid crystal ink with circularly polarized luminescence, and the chiral liquid crystal ink comprises the following components: room temperature nematic liquid crystal, chiral molecules and luminescent molecules, wherein the room temperature nematic liquid crystal is SLC1717, the chiral molecules are R811 and S811 respectively, and the luminescent molecule is CsPbI₃。

The preparation method comprises the following steps:

mixing room temperature nematic liquid crystal SLC1717, chiral molecule R811 and luminescent molecule CsPbI₃And uniformly mixing the nematic liquid crystal in toluene to obtain a mixed solution, wherein the concentration of the room-temperature nematic liquid crystal in the organic solvent is 10mg/mL, the concentration of the chiral molecules in the organic solvent is 1mg/mL, and the concentration of the luminescent molecules in the organic solvent is 5.5mg/mL, and removing the toluene in the mixed solution to obtain the chiral liquid crystal ink.

The light with the wavelength of 360nm is used as the excitation wavelength to excite the two mixed systems respectively to carry out CPL test, wherein positive CPL signals are obtained when the chiral molecule is S811, and negative CPL signals are obtained when the chiral molecule is R811, and the results are shown in figure 19.

Example 20

The embodiment provides two kinds of chiral liquid crystal ink with circularly polarized luminescence, and the chiral liquid crystal ink comprises the following components: the liquid crystal comprises room-temperature nematic liquid crystal, chiral molecules and luminescent molecules, wherein the room-temperature nematic liquid crystal is MBBA, the chiral molecules are R811 and S811 respectively, and the luminescent molecules are CdSe/ZnS quantum dots emitting blue light.

The preparation method comprises the following steps:

uniformly mixing room-temperature nematic liquid crystal MBBA, chiral molecules R811 and luminescent molecules CdSe/ZnS quantum dots in toluene to obtain a mixed solution, wherein the concentration of the room-temperature nematic liquid crystal in an organic solvent is 10mg/mL, the concentration of the chiral molecules in the organic solvent is 3mg/mL, the concentration of the luminescent molecules in the organic solvent is 30mg/mL, and removing the toluene in the mixed solution to obtain the chiral liquid crystal ink.

Light with the wavelength of 360nm is used as an excitation wavelength to excite the two mixed systems respectively to perform CPL test, wherein a positive CPL signal is obtained when the chiral molecule is S811, and a negative CPL signal is obtained when the chiral molecule is R811, and the results are shown in the attached figure 20.

Example 21

The embodiment provides two kinds of chiral liquid crystal ink with circularly polarized luminescence, and the chiral liquid crystal ink comprises the following components: the liquid crystal comprises room-temperature nematic liquid crystal, chiral molecules and luminescent molecules, wherein the room-temperature nematic liquid crystal is MBBA, the chiral molecules are R811 and S811 respectively, and the luminescent molecules are CdSe/ZnS quantum dots emitting green light.

The preparation method comprises the following steps:

uniformly mixing room-temperature nematic liquid crystal MBBA, chiral molecules R811 and luminescent molecules CdSe/ZnS quantum dots in toluene to obtain a mixed solution, wherein the concentration of the room-temperature nematic liquid crystal in an organic solvent is 10mg/mL, the concentration of the chiral molecules in the organic solvent is 1mg/mL, the concentration of the luminescent molecules in the organic solvent is 10mg/mL, and removing the toluene in the mixed solution to obtain the chiral liquid crystal ink.

Light with the wavelength of 360nm is used as an excitation wavelength to respectively excite the two mixed systems to carry out CPL test, wherein a positive CPL signal is obtained when the chiral molecule is S811, and a negative CPL signal is obtained when the chiral molecule is R811, and the results are shown in figure 21.

Example 22

The embodiment provides two kinds of chiral liquid crystal ink with circularly polarized luminescence, and the chiral liquid crystal ink comprises the following components: the liquid crystal comprises room-temperature nematic liquid crystal, chiral molecules and luminescent molecules, wherein the room-temperature nematic liquid crystal is MBBA, the chiral molecules are R811 and S811 respectively, and the luminescent molecules are CdSe/ZnS quantum dots emitting red light.

The preparation method comprises the following steps:

Light with the wavelength of 360nm is used as an excitation wavelength to excite the two mixed systems respectively to perform CPL test, wherein a positive CPL signal is obtained when the chiral molecule is S811, and a negative CPL signal is obtained when the chiral molecule is R811, and the result is shown in figure 22.

Example 23

The embodiment provides two kinds of chiral liquid crystal ink with circularly polarized luminescence, and the chiral liquid crystal ink comprises the following components: the light-emitting material comprises room-temperature nematic liquid crystal, chiral molecules and light-emitting molecules, wherein the room-temperature nematic liquid crystal is MBBA, the chiral molecules are R811 and S811 respectively, and the light-emitting molecules are InP/ZnS quantum dots emitting green light.

The preparation method comprises the following steps:

uniformly mixing room-temperature nematic liquid crystal MBBA, chiral molecules R811 and luminescent molecules InP/ZnS quantum dots in toluene to obtain a mixed solution, wherein the concentration of the room-temperature nematic liquid crystal in an organic solvent is 10mg/mL, the concentration of the chiral molecules in the organic solvent is 1mg/mL, the concentration of the luminescent molecules in the organic solvent is 10mg/mL, and removing the toluene in the mixed solution to obtain the chiral liquid crystal ink.

Light with the wavelength of 360nm is used as an excitation wavelength to excite the two mixed systems respectively to perform CPL test, wherein a positive CPL signal is obtained when the chiral molecule is S811, and a negative CPL signal is obtained when the chiral molecule is R811, and the result is shown in figure 23.

Example 24

The embodiment provides two kinds of chiral liquid crystal ink with circularly polarized luminescence, and the chiral liquid crystal ink comprises the following components: the light-emitting material comprises room-temperature nematic liquid crystal, chiral molecules and light-emitting molecules, wherein the room-temperature nematic liquid crystal is MBBA, the chiral molecules are R811 and S811 respectively, and the light-emitting molecules are InP/ZnS quantum dots emitting red light.

The preparation method comprises the following steps:

Light with the wavelength of 360nm is used as an excitation wavelength, the two mixed systems are respectively excited, and CPL test is carried out, wherein a positive CPL signal is obtained when the chiral molecule is S811, and a negative CPL signal is obtained when the chiral molecule is R811, and the result is shown in figure 24.

Example 25

The embodiment provides two kinds of chiral liquid crystal ink with circularly polarized luminescence, and the chiral liquid crystal ink comprises the following components: the liquid crystal comprises room-temperature nematic liquid crystal, chiral molecules and luminescent molecules, wherein the room-temperature nematic liquid crystal is MBBA, the chiral molecules are R811 and S811 respectively, and the luminescent molecules are NaYF emitting blue light₄:Yb,Tm。

The preparation method comprises the following steps:

mixing room temperature nematic liquid crystal MBBA, chiral molecule R811 and luminescent molecule NaYF₄Yb and Tm are uniformly mixed in toluene to obtain a mixed solution, wherein the concentration of the room-temperature nematic liquid crystal in an organic solvent is 10mg/mL, the concentration of the chiral molecules in the organic solvent is 1mg/mL, and the concentration of the luminescent molecules in the organic solvent is highAnd the degree is 10mg/mL, and then toluene in the mixed solution is removed to obtain the chiral liquid crystal ink.

The two mixed systems are respectively excited by using light with the wavelength of 980nm as excitation wavelength to carry out CPL test, wherein a positive CPL signal is obtained when the chiral molecule is S811, and a negative CPL signal is obtained when the chiral molecule is R811, and the results are shown in figure 25.

Example 26

The embodiment provides two kinds of chiral liquid crystal ink with circularly polarized luminescence, and the chiral liquid crystal ink comprises the following components: the liquid crystal display comprises room-temperature nematic liquid crystal, chiral molecules and luminescent molecules, wherein the room-temperature nematic liquid crystal is MBBA, the chiral molecules are R811 and S811 respectively, and the luminescent molecules are NaYF emitted by green light₄:Yb,Er。

The preparation method comprises the following steps:

mixing room temperature nematic liquid crystal MBBA, chiral molecule R811 and luminescent molecule NaYF₄Yb and Er are uniformly mixed in toluene to obtain a mixed solution, wherein the concentration of the room-temperature nematic liquid crystal in an organic solvent is 10mg/mL, the concentration of the chiral molecules in the organic solvent is 1mg/mL, the concentration of the luminescent molecules in the organic solvent is 10mg/mL, and then the toluene in the mixed solution is removed to obtain the chiral liquid crystal ink.

The two mixed systems are respectively excited by using light with the wavelength of 980nm as excitation wavelength to carry out CPL test, wherein a positive CPL signal is obtained when the chiral molecule is S811, and a negative CPL signal is obtained when the chiral molecule is R811, and the results are shown in figure 26.

Example 27

The embodiment provides two kinds of chiral liquid crystal ink with circularly polarized luminescence, and the chiral liquid crystal ink comprises the following components: room temperature nematic liquid crystal, chiral molecule and luminescent moleculeThe room-temperature nematic liquid crystal is MBBA, the chiral molecules are R811 and S811 respectively, and the luminescent molecule is CsPbBr₃。

The preparation method comprises the following steps:

mixing room-temperature nematic liquid crystal MBBA, chiral molecules R811 and luminescent molecules CsPbBr₃And uniformly mixing the nematic liquid crystal in toluene to obtain a mixed solution, wherein the concentration of the room-temperature nematic liquid crystal in the organic solvent is 10mg/mL, the concentration of the chiral molecules in the organic solvent is 1mg/mL, and the concentration of the luminescent molecules in the organic solvent is 5.5mg/mL, and removing the toluene in the mixed solution to obtain the chiral liquid crystal ink.

The light with the wavelength of 360nm is used as the excitation wavelength to excite the two mixed systems respectively to carry out CPL test, wherein positive CPL signals are obtained when the chiral molecule is S811, and negative CPL signals are obtained when the chiral molecule is R811, and the results are shown in the attached figure 27.

The present invention is illustrated by the above embodiments, but the present invention is not limited to the above embodiments, i.e. the present invention is not limited to the above embodiments. It will be apparent to those skilled in the art that any modification of the present invention, equivalent substitutions of selected materials and additions of auxiliary components, selection of specific modes and the like, which are within the scope and disclosure of the present invention, are contemplated by the present invention.

Claims

1. The chiral liquid crystal ink capable of emitting light in a circular polarization mode is characterized by comprising the following components: the light-emitting material comprises room-temperature nematic liquid crystal, chiral molecules and light-emitting molecules, wherein the light-emitting molecules comprise any one of quantum dots, perovskite nanocrystals or up-conversion nanoparticles.

2. The circularly polarized luminescent chiral liquid crystal ink according to claim 1, wherein the quantum dots comprise any one of CdSe/ZnS quantum dots or InP/ZnS quantum dots;

preferably, the CdSe/ZnS quantum dots are blue light-emitting CdSe/ZnS quantum dots, green light-emitting CdSe/ZnS quantum dots or red light-emitting CdSe/ZnS quantum dots;

preferably, the InP/ZnS quantum dots are green emitting InP/ZnS quantum dots or red emitting InP/ZnS quantum dots.

3. The circularly polarized luminescent chiral liquid crystal ink according to claim 1 or 2, wherein the perovskite nanocrystal comprises CsPbCl₃、CsPbBr₃Or CsPbI₃Any one of them.

4. The circularly polarized luminescent chiral liquid crystal ink according to any one of claims 1 to 3, wherein the up-converting nanoparticles comprise NaYF₄Yb, Tm or NaYF₄Any one of Yb and Er;

preferably, the up-conversion nanoparticles are blue light emitting NaYF₄Yb, Tm or green light emitting NaYF₄:Yb,Er。

5. The circularly polarized light emitting chiral liquid crystal ink according to any one of claims 1 to 4, wherein the room temperature nematic liquid crystal contained in the chiral liquid crystal ink comprises any one of SLC1717, 5CB or MBBA.

6. The circularly polarized light emitting chiral liquid crystal ink according to any one of claims 1 to 5, wherein the chiral liquid crystal ink contains chiral molecules of either S811 or R811.

7. The circularly polarized light emitting chiral liquid crystal ink according to any one of claims 1 to 6, wherein the chiral molecules contained in the chiral liquid crystal ink account for 1 to 40% of the mass of the room temperature nematic liquid crystal;

preferably, when the room-temperature nematic liquid crystal is 5CB, the chiral molecules account for 1% of the mass of the room-temperature nematic liquid crystal;

preferably, when the room-temperature nematic liquid crystal is MBBA, the chiral molecules account for 2% of the mass of the room-temperature nematic liquid crystal;

preferably, when the room-temperature nematic liquid crystal is SLC1717 and the luminescent molecules are red-light-emitting CdSe/ZnS quantum dots, the chiral molecules account for 26% of the mass of the room-temperature nematic liquid crystal;

preferably, when the room temperature nematic liquid crystal is SLC1717, the light-emitting molecules are green light-emitting CdSe/ZnS quantum dots, green light-emitting InP/ZnS quantum dots or CsPbBr₃When the chiral molecules account for 32.5 percent of the mass of the room-temperature nematic liquid crystal;

preferably, when the room temperature nematic liquid crystal is SLC1717, the light-emitting molecules are blue light-emitting CdSe/ZnS quantum dots and blue light-emitting NaYF₄When Yb and Tm exist, the chiral molecules account for 35.8 percent of the mass of the room-temperature nematic liquid crystal;

preferably, when the room temperature nematic liquid crystal is SLC1717, the luminescent molecules are red light emitting InP/ZnS quantum dots and CsPbI₃When the chiral molecules account for 21 percent of the mass of the room-temperature nematic liquid crystal;

preferably, when the room temperature nematic liquid crystal is SLC1717, the light emitting molecules are green light emitting NaYF₄When Yb and Er exist, the chiral molecules account for 30 percent of the mass of the room-temperature nematic liquid crystal;

preferably, when the room temperature nematic liquid crystal is SLC1717, the light emitting molecule is CsPbCl₃When the chiral molecules account for 40% of the mass of the room-temperature nematic liquid crystal;

8. The method for preparing a circularly polarized light emitting chiral liquid crystal ink according to any one of claims 1 to 7, comprising the steps of:

9. The method of claim 8, wherein the organic solvent is toluene;

preferably, the concentration of the luminescent molecule in the organic solvent is 1-30 mg/mL;

preferably, when the luminescent molecule is a quantum dot, its concentration in the organic solvent is 1-30mg/mL, preferably 10 mg/mL;

preferably, when the luminescent molecule is a perovskite nanocrystal, the concentration thereof in the organic solvent is 1-30mg/mL, preferably 5.5 mg/mL;

preferably, when the luminescent molecule is an up-conversion nanoparticle, its concentration in the organic solvent is 1-30mg/mL, preferably 10 mg/mL;

preferably, the concentration of the room-temperature nematic liquid crystal in the organic solvent is 0.1-20mg/mL, preferably 10 mg/mL;

preferably, the concentration of the chiral molecule in the organic solvent is 0.1-10mg/mL, preferably 1 mg/mL;

10. Use of a circularly polarized luminescent chiral liquid crystal ink according to any one of claims 1 to 7 in chiral printing or chiral printing.