WO2021238130A1 - Quantum rod and manufacturing method therefor, and liquid crystal display panel - Google Patents

Abstract

A quantum rod (10) and a manufacturing method therefor, and a liquid crystal display panel (20). The quantum rod (10) comprises a quantum rod main body (11) and an electric field alignment object (12) modified on the outer side of the quantum rod main body (11), wherein the electric field alignment object (12) is used for improving the dielectric anisotropy of the quantum rod main body (11), so as to enable the quantum rod (10) to have an electric field sensitivity, thereby facilitating the realization of directional alignment of the quantum rod (10) under the action of an electric field. The liquid crystal display panel (20) contains a quantum rod film layer (22) which uses the quantum rod (10).

Description

Quantum rod, manufacturing method thereof, and liquid crystal display panel

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on May 27, 2020, the application number is 202010461433.2, and the invention title is "quantum rod and its production method, liquid crystal display panel", the entire content of which is incorporated by reference In this application.

Technical field

This application relates to the field of display technology, in particular to a quantum rod, a manufacturing method thereof, and a liquid crystal display panel.

Background technique

Liquid crystal display is a kind of display device widely used today. Its main structure includes a backlight module and a liquid crystal panel. In order to make the light emitted by the backlight module pass through the liquid crystal panel in the same polarization direction, a polarizer is arranged between the two. The polarizers currently in use are all absorption-type polarizers, that is, when the natural light emitted by the backlight module passes through the polarizer, the component located in the direction of the absorption axis of the polarizer will be absorbed and cannot pass through. Therefore, the polarizer has a negative effect on the backlight module. In theory, the light transmittance of the backlight does not exceed 50%, causing light source loss and energy waste.

Setting a structure containing quantum rods in the liquid crystal display to maximize the light emitted by the backlight module is consistent with the direction of the passing axis of the polarizer, which is a common method for solving the above-mentioned problems in the prior art. The quantum rod is a one-dimensional linear nanostructure, which can convert the natural light emitted by the backlight module into polarized light without causing loss of light source. However, the key to ensuring the function of quantum rods is to ensure that the arrangement direction of the quantum rods is consistent with the direction of the polarizer's passing axis. However, the prior art has always been difficult to solve the problem of high-precision alignment of quantum rods, resulting in existing liquid crystal displays. Although the quantum rod structure is used, the utilization rate of the light source is still low.

technical problem

In the prior art, it is difficult for the quantum rods used in the backlight module to achieve high-precision directional arrangement, which causes the light emitted by the backlight module to be converted into polarized light by the quantum rods, and its polarization direction cannot be aligned with the direction of the passing axis of the polarizer. They are completely consistent, resulting in loss of light energy and low light source utilization.

Technical solutions

In order to solve the above technical problems, the solutions provided by this application are as follows:

The present application provides a quantum rod, comprising: a quantum rod main body and an electric field alignment object modified on the outside of the quantum rod main body, the electric field alignment object is used to improve the dielectric anisotropy of the quantum rod main body, so that The quantum rod has electric field sensitivity.

In the quantum rod of the present application, the electric field alignment object is modified on the side surface of the main body of the quantum rod.

In the quantum rod of the present application, the electric field alignment object is asymmetrically distributed on the side surface of the main body of the quantum rod.

In the quantum rod of the present application, the electric field alignment object is modified on the end of the main body of the quantum rod.

In the quantum rod of the present application, the electric field alignment object exists at one end of the main body of the quantum rod.

In the quantum rod of the present application, the electric field alignment object and the main body of the quantum rod form a connection through a chemical bond.

In the quantum rod of the present application, the electric field alignment object and the main body of the quantum rod form a connection through physical overlap.

In the quantum rod of the present application, the electric field alignment object is gold nanoparticles.

In the quantum rod of the present application, the main body of the quantum rod is composed of a light-emitting core and an inorganic protective shell covering the light-emitting core, and the light-emitting core is composed of a zinc-cadmium-selenium compound, an indium-phosphorus compound, a cadmium-selenium compound, One or more of cadmium-selenium-tellurium compound, indium-arsenic compound, the inorganic protective shell is composed of cadmium-sulfur compound, zinc-selenium compound, zinc-cadmium-sulfur compound, zinc-sulfur compound, zinc- One or more constituents of oxygen compounds.

In the quantum rod of the present application, the main body of the quantum rod is a composite quantum rod composed of a cadmium-selenium compound and a silica hydrogel, or the main body of the quantum rod is a perovskite-type quantum rod.

This application also provides a method for manufacturing a quantum rod, which includes the following steps:

Preparing a solution containing the quantum rod body;

Prepare a solution containing a precursor of the electric field alignment substance;

Mixing the solution containing the quantum rod main body and the solution containing the electric field alignment substance precursor, and reacting under light and/or heating conditions, the electric field alignment substance precursor generates an electric field alignment substance on the surface of the quantum rod main body , To obtain the quantum rod.

In the quantum rod manufacturing method of the present application, the method for preparing the solution containing the quantum rod body is:

Preparing a first solution containing a cadmium-sulfur compound or/and a cadmium-selenium compound and a precursor of sulfur;

Configuring a second solution containing n-trioctyl phosphine oxide, n-trioctyl phosphine and phosphonic acid;

Mixing and reacting the first solution with the second solution to generate a third solution containing the quantum rod body;

Separating the quantum rod body from the third solution;

The quantum rod body is dispersed in a toluene solution to obtain the solution containing the quantum rod body.

In the method for manufacturing a quantum rod of the present application, the method for configuring the solution containing the precursor of the electric field alignment substance is:

Fully mix p-dodecylamine or octadecylamine or trioctylamine with dodecyldimethylammonium bromide and gold chloride in a toluene solution to obtain the solution containing the precursor of the electric field alignment substance.

In the method for manufacturing a quantum rod of the present application, the prepared electric field alignment object is gold nanoparticles.

In the method for manufacturing a quantum rod of the present application, the conditions for the mixing reaction of the solution containing the main body of the quantum rod and the solution containing the precursor of the electric field alignment substance are:

Temperature conditions: 0 degrees Celsius to 40 degrees Celsius;

Illumination conditions: laser irradiation, wavelength 473 nanometers, power 40 milliwatts.

In the method for manufacturing a quantum rod of the present application, the conditions for the mixing reaction of the solution containing the main body of the quantum rod and the solution containing the precursor of the electric field alignment substance are:

Temperature conditions: 40 degrees Celsius to 400 degrees Celsius; no light.

The present application further provides a liquid crystal display panel, which includes:

Backlight module;

The quantum rod film layer is disposed on the light-emitting surface of the backlight module, and includes a base layer and quantum rods aligned on the base layer. The quantum rod includes a quantum rod main body and is modified on the quantum rod An electric field alignment object outside the main body, the electric field alignment object is used to increase the dielectric anisotropy of the quantum rod main body, so that the quantum rod has electric field sensitivity;

The liquid crystal panel is arranged on the quantum rod film layer.

In the liquid crystal display panel of the present application, the electric field alignment object is modified on the side surface of the quantum rod main body.

In the liquid crystal display panel of the present application, the electric field alignment object is modified on the end of the quantum rod main body.

In the liquid crystal display panel of the present application, the electric field alignment object is asymmetrically distributed on the outside of the quantum rod main body.

Beneficial effect

The quantum rod provided by the present application includes a quantum rod main body and an electric field alignment object, and the electric field alignment object is used to make the quantum rod electric field sensitive, so that the quantum rod can be easily oriented and arranged under the action of an electric field; The liquid crystal display panel includes the quantum rod film layer using the quantum rod, which is beneficial to reduce the production cost of the liquid crystal display panel and improve the light source and energy utilization rate of the liquid crystal display panel.

Description of the drawings

In order to explain the embodiments or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only for application. For some embodiments, those of ordinary skill in the art can obtain other drawings based on these drawings without creative work.

FIG. 1 is a schematic diagram of the first structure of a quantum rod provided by an embodiment of the present application;

2 is a schematic diagram of a second structure of a quantum rod provided by an embodiment of the present application;

FIG. 3 is a flowchart of a method for manufacturing a quantum rod according to an embodiment of the present application;

4 is a schematic diagram of the structure of a liquid crystal display panel provided by an embodiment of the present application;

FIG. 5 is a schematic diagram of the structure of the quantum rod film layer in the liquid crystal display panel shown in FIG. 4.

Embodiments of the present invention

The description of the following embodiments refers to the attached drawings to illustrate specific embodiments that can be implemented in the present application. The directional terms mentioned in this application, such as [Up], [Down], [Front], [Back], [Left], [Right], [Inner], [Outer], [Side], etc., are for reference only The direction of the additional schema. Therefore, the directional terms used are used to illustrate and understand the application, rather than to limit the application. In the figure, units with similar structures are indicated by the same reference numerals.

The embodiments of the present application provide a quantum rod. The electric field alignment object is modified on the outside of the quantum rod body of the quantum rod, so that the quantum rod is sensitive to the electric field, and the directional arrangement of the quantum rod can be induced by the action of the electric field, which is beneficial It is used in liquid crystal display panels to improve the light source and energy efficiency of liquid crystal display panels.

As shown in Fig. 1 and Fig. 2, Fig. 1 and Fig. 2 are schematic diagrams of two structures of quantum rods provided by embodiments of the present application. The quantum rod 10 provided by the embodiment of the present application includes a quantum rod main body 11 and an electric field alignment object 12 modified on the outside of the quantum rod main body 11. The opposite sex makes the quantum rod 10 sensitive to electric field. It should be noted that the so-called "dielectric anisotropy" refers to the polarization characteristics of a dielectric that is oriented toward the ends of its internal charges under the action of an electric field, so that the charges at the corresponding ends of the dielectric are reversed; the so-called " “Electric field sensitivity” refers to the property of a dielectric in an electric field that is oriented and distributed under the action of an electric field; the stronger the dielectric anisotropy, the stronger the electric field sensitivity of the dielectric; for the present application, the quantum rod 10 is In the dielectric, the electric field alignment object 12 is modified on the surface of the quantum rod body 11, so that the quantum rod 10 exhibits stronger dielectric anisotropy, so that the quantum rod 10 is affected by the electric field. The ability of the electric field to be aligned is stronger.

In addition, it should be noted that the so-called electric field alignment object 12 modified on the outside of the quantum rod main body 11 means that the electric field alignment object 12 can be connected to the quantum rod main body 11 through a chemical bond, or the electric field alignment object 12 It is also possible to form a connection with the quantum rod body 11 by means of physical overlap.

According to an embodiment of the present application, as shown in FIG. 1, the electric field alignment object 12 may be modified on the side surface of the quantum rod body 11. It should be understood that the quantum rod body 11 has a one-dimensional linear structure, and the outer surface along the length of the quantum rod body 11 is the side surface of the quantum rod body 11. There is a large dielectric difference between the electric field alignment object 12 and the quantum rod main body 11. By modifying the electric field alignment object 12 on the side of the quantum rod main body 11, the quantum rod main body 11 is increased. The electrical polarity of 11 under an electric field further increases the dielectric anisotropy of the quantum rod body 11, which is beneficial to the directional arrangement of the quantum rods 10 under the action of an electric field.

Optionally, the electric field alignment object 12 is distributed asymmetrically on the outside of the quantum rod main body 11 to further improve the electrical polarity of the quantum rod main body 11 under the action of an electric field.

According to an embodiment of the present application, as shown in FIG. 2, the electric field alignment object 12 can also be modified on the end of the quantum rod body 11. It should be understood that the quantum rod main body 11 has a one-dimensional linear structure, and the ends of the quantum rod main body 11 are along the two end faces of the quantum rod main body 11. There is a large dielectric difference between the electric field alignment object 12 and the quantum rod main body 11. By modifying the electric field alignment object 12 on the end of the quantum rod main body 11, the quantum rod main body The electrical conductivity of 11 under the electric field is further increased, thereby increasing the dielectric anisotropy of the quantum rod body 11, which is beneficial to the directional arrangement of the quantum rods 10 under the action of the electric field.

Optionally, the electric field alignment object 12 only exists at one end of the quantum rod main body 11, which further increases the dielectric difference between the two ends of the quantum rod main body 11, so that the dielectric of the quantum rod main body 11 is The maximization of the opposite sex is beneficial to realize the directional arrangement of the quantum rods 10 under the action of a lower electric field.

Optionally, the electric field alignment object 12 is gold nanoparticles. It should be understood that gold is an inert metal with good conductivity, and its internal electrons are more likely to gather in the direction opposite to the direction of the electric field under the action of an electric field, thereby exhibiting greater electrical polarity; in this application, The size of the gold nanoparticles is smaller than that of the quantum rod main body 11, so that the quantum rod main body 11 exhibits the electric polarization phenomenon of local charge concentration under the action of an electric field, which is beneficial to the quantum rod 10 The directional arrangement.

Optionally, the quantum rod body 11 may be a composite quantum rod, such as a composite quantum rod of a cadmium-selenium compound and silica hydrogel, or a perovskite quantum rod, or a core-shell Structured quantum rod; wherein, the core-shell structured quantum rod is composed of a luminescent core and an inorganic protective shell covering the luminescent core, and the luminescent core is composed of zinc-cadmium-selenium compounds, indium-phosphorus compounds, cadmium -Selenium compound, cadmium-selenium-tellurium compound, indium-arsenic compound composed of one or more, the inorganic protective shell is composed of cadmium-sulfur compound, zinc-selenium compound, zinc-cadmium-sulfur compound, zinc-sulfur One or more of a compound and a zinc-oxygen compound; the quantum rod body 11 is preferably a quantum rod of the core-shell structure, so that the quantum rod body 11 has the potential to generate greater electrical polarity .

In summary, the quantum rod provided by the embodiments of the present application includes a quantum rod main body and an electric field alignment object, and the electric field alignment object is used to make the quantum rod electric field sensitive, and then the quantum rods can be induced to be aligned by the electric field. , It is beneficial to be applied to the liquid crystal display panel to improve the light source and energy efficiency of the liquid crystal display panel.

The embodiment of the present application also provides a method for manufacturing a quantum rod. By adding an electric field alignment object to the preparation process of the main body of the quantum rod, the final produced quantum rod includes the main body of the quantum rod and is modified on the quantum rod. The electric field alignment object on the outer side of the main body makes the quantum rods electric field sensitive, which is beneficial to the directional arrangement of the quantum rods under the action of the electric field.

As shown in FIG. 3, the method for manufacturing the quantum rod includes the following steps:

Step S1, preparing a solution containing a quantum rod body, specifically includes the following operation steps.

Configure a first solution containing a cadmium-sulfur compound or/and a cadmium-selenium compound and a precursor of sulfur; configure a second solution containing n-trioctylphosphine oxide, n-trioctylphosphine and phosphonic acid; in the second solution Under the condition of 360 degrees Celsius to 380 degrees Celsius, the first solution and the second solution are mixed and reacted to generate a third solution containing the quantum rod body; the quantum rod body is removed from the quantum rod body by extraction or filtration. The third solution is separated; finally, the quantum rod body separated from the third solution is dispersed in a toluene solution to obtain the solution containing the quantum rod body.

Step S2, preparing a solution containing a precursor of an electric field alignment substance, specifically including the following operation steps.

Take a certain amount of p-dodecylamine or octadecylamine or trioctylamine and mix it thoroughly with dodecyldimethylammonium bromide and gold chloride in the toluene solution. During the mixing process, use ultrasonic vibration to treat The mixing is accelerated until the mixed solution changes from dark brown to golden color, that is, the solution containing the precursor of the electric field alignment substance is obtained.

Step S3, mixing the solution containing the quantum rod body and the solution containing the electric field alignment substance precursor, and reacting under light and/or heating conditions, the electric field alignment substance precursor is generated on the surface of the quantum rod main body The electric field alignment object is used to obtain the quantum rod.

Further, during the reaction, the reaction temperature is controlled by water or a water bath, and the light conditions are controlled by a laser emitter.

Optionally, the conditions for the mixing reaction of the solution containing the quantum rod body and the solution containing the electric field alignment precursor are: temperature conditions: 0 degrees Celsius to 40 degrees Celsius; light conditions: laser irradiation, wavelength 473 nanometers, power 40 Milliwatts. The quantum rod prepared under this condition has a quantum rod structure in which the electric field alignment object 11 is modified on the end of the quantum rod main body 12 as shown in FIG. 2.

Optionally, the conditions for the mixing reaction of the solution containing the quantum rod body and the solution containing the electric field alignment precursor are: temperature conditions: 40 degrees Celsius to 400 degrees Celsius; no light. The quantum rod prepared under this condition has a quantum rod structure in which the electric field alignment object 11 is modified on the side of the quantum rod main body 12 as shown in FIG. 1.

Further, the electric field alignment object prepared by the above method is gold nanoparticles.

In summary, the method for manufacturing the quantum rod provided in the embodiments of the present application includes the preparation process of the quantum rod main body and the process of preparing the electric field alignment object on the quantum rod main body, so that the finally produced quantum rod includes the quantum rod main body And the electric field alignment object modified on the outer side of the quantum rod body, so that the quantum rod has electric field sensitivity, which is beneficial to the directional arrangement of the quantum rod under the action of an electric field.

The embodiment of the present application further provides a liquid crystal display panel 20. As shown in FIGS. 4 and 5, the liquid crystal display panel 20 includes a backlight module 21 and a quantum rod disposed on the light-emitting surface of the backlight module 21. The film layer 22 and the liquid crystal panel 23 arranged on the quantum rod film layer 22.

The quantum rod film layer 22 includes a base layer 221 and quantum rods 10 aligned on the base layer 221. The quantum rods 10 are the quantum rods provided in the above-mentioned embodiments of the application, or are the above-mentioned embodiments of the application. A quantum rod manufactured by the provided method for manufacturing a quantum rod.

In the manufacturing process of the quantum rod film layer 22, the solution containing the quantum rod 10 is uniformly coated on the base layer 221, and then an electric field is applied to the quantum rod film layer 22, and the quantum rod 10 realizes the directional arrangement under the action of an electric field, and the production process of the quantum rod film layer 22 is completed after drying treatment.

It should be understood that the liquid crystal display panel provided in this embodiment includes the quantum rod film layer formed by the quantum rod provided by the embodiment of the application or the quantum rod prepared by the method for manufacturing the quantum rod provided by the embodiment of the application, which is easy to realize the quantum rod. The directional arrangement of the quantum rods in the film layer reduces the production cost of the liquid crystal display panel, and improves the light source and energy utilization rate of the liquid crystal display panel.

It should be noted that although the application is disclosed as above in specific embodiments, the above-mentioned embodiments are not intended to limit the application, and those of ordinary skill in the art can make various modifications without departing from the spirit and scope of the application. Therefore, the protection scope of this application is subject to the scope defined by the claims.

Claims (20)

1. A quantum rod, comprising: a quantum rod main body and an electric field alignment object modified on the outside of the quantum rod main body, the electric field alignment object is used to increase the dielectric anisotropy of the quantum rod main body, so that the quantum The rod is sensitive to electric fields.
2. The quantum rod according to claim 1, wherein the electric field alignment object is modified on the side surface of the main body of the quantum rod.
3. The quantum rod according to claim 2, wherein the electric field alignment object is asymmetrically distributed on the side of the main body of the quantum rod.
4. The quantum rod according to claim 1, wherein the electric field alignment object is modified on the end of the quantum rod main body.
5. The quantum rod according to claim 3, wherein the electric field alignment object exists at one end of the main body of the quantum rod.
6. The quantum rod according to claim 1, wherein the electric field alignment object and the main body of the quantum rod form a connection through a chemical bond.
7. The quantum rod according to claim 1, wherein the electric field alignment object and the main body of the quantum rod form a connection through physical overlap.
8. The quantum rod according to claim 1, wherein the electric field alignment object is a gold nanoparticle.
9. The quantum rod according to claim 1, wherein the main body of the quantum rod is composed of a light-emitting core and an inorganic protective shell covering the light-emitting core, and the light-emitting core is composed of a zinc-cadmium-selenium compound, an indium-phosphorus compound, and cadmium. -Selenium compound, cadmium-selenium-tellurium compound, indium-arsenic compound composed of one or more, the inorganic protective shell is composed of cadmium-sulfur compound, zinc-selenium compound, zinc-cadmium-sulfur compound, zinc-sulfur One or more of compounds and zinc-oxygen compounds.
10. The quantum rod according to claim 1, wherein the main body of the quantum rod is a composite quantum rod composed of a cadmium-selenium compound and a silica hydrogel, or the main body of the quantum rod is a perovskite type quantum rod. Great.
11. A method for manufacturing a quantum rod, which includes the following steps:

    Preparing a solution containing the quantum rod body;

    Prepare a solution containing a precursor of the electric field alignment substance;

    Mixing the solution containing the quantum rod main body and the solution containing the electric field alignment substance precursor, and reacting under light and/or heating conditions, the electric field alignment substance precursor generates an electric field alignment substance on the surface of the quantum rod main body , To obtain the quantum rod.
12. The method for manufacturing a quantum rod according to claim 11, wherein the method for preparing a solution containing a quantum rod body is:

    Preparing a first solution containing a cadmium-sulfur compound or/and a cadmium-selenium compound and a precursor of sulfur;

    Configuring a second solution containing n-trioctyl phosphine oxide, n-trioctyl phosphine and phosphonic acid;

    Mixing and reacting the first solution with the second solution to generate a third solution containing the quantum rod body;

    Separating the quantum rod body from the third solution;

    The quantum rod body is dispersed in a toluene solution to obtain the solution containing the quantum rod body.
13. The method of manufacturing a quantum rod according to claim 11, wherein the method of configuring the solution containing the precursor of the electric field alignment substance is:

    Fully mix p-dodecylamine or octadecylamine or trioctylamine with dodecyldimethylammonium bromide and gold chloride in a toluene solution to obtain the solution containing the precursor of the electric field alignment substance.
14. The method for manufacturing a quantum rod according to claim 13, wherein the prepared electric field alignment object is gold nanoparticles.
15. The method for manufacturing a quantum rod according to claim 11, wherein the conditions for the mixing reaction of the solution containing the quantum rod body and the solution containing the electric field alignment substance precursor are:

    Temperature conditions: 0 degrees Celsius to 40 degrees Celsius;

    Illumination conditions: laser irradiation, wavelength 473 nanometers, power 40 milliwatts.
16. The method for manufacturing a quantum rod according to claim 11, wherein the conditions for the mixing reaction of the solution containing the quantum rod body and the solution containing the electric field alignment substance precursor are:

    Temperature conditions: 40 degrees Celsius to 400 degrees Celsius; no light.
17. A liquid crystal display panel, which includes:

    Backlight module;

    The quantum rod film layer is disposed on the light-emitting surface of the backlight module, and includes a base layer and quantum rods aligned on the base layer. The quantum rod includes a quantum rod main body and is modified on the quantum rod An electric field alignment object outside the main body, the electric field alignment object is used to increase the dielectric anisotropy of the quantum rod main body, so that the quantum rod has electric field sensitivity;

    The liquid crystal panel is arranged on the quantum rod film layer.
18. 18. The liquid crystal display panel of claim 17, wherein the electric field alignment object is modified on the side surface of the quantum rod main body.
19. 18. The liquid crystal display panel of claim 17, wherein the electric field alignment object is modified on the end of the quantum rod main body.
20. 18. The liquid crystal display panel of claim 17, wherein the electric field alignment object is asymmetrically distributed outside the quantum rod main body.