CN111592878A - Quantum rod and its production method, liquid crystal display panel - Google Patents

Abstract

The present application provides a quantum rod, a manufacturing method thereof, and a liquid crystal display panel. The quantum rod includes a quantum rod body and an electric field aligner modified on the outside of the quantum rod body, and the electric field aligner is used to improve the quantum rod. The dielectric anisotropy of the host makes the quantum rods have electric field sensitivity, so that the quantum rods can be easily aligned under the action of the electric field; the liquid crystal display panel includes a quantum rod film layer applying the quantum rods , 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

Quantum rod and its production method, liquid crystal display panel

technical field

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

Background technique

A liquid crystal display is a widely used display device today, and 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 used are all absorbing 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. The transmittance of the backlight theoretically does not exceed 50%, resulting in light source loss and energy waste.

A structure including quantum rods is arranged in the liquid crystal display, so that the light emitted by the backlight module can be maximized in the same direction as the passing axis of the polarizer, which is a common means to solve the above problems in the prior art. Quantum rods are one-dimensional linear nanostructures that absorb natural light from a backlight module and convert it into polarized light without loss of light source. However, the key to ensuring the functioning of the quantum rods is to ensure that the alignment direction of the quantum rods is consistent with the direction of the passing axis of the polarizer, and the existing technology has been difficult to solve the problem of high-precision alignment of the quantum rods, resulting in the existing liquid crystal display. Although the quantum rod structure is used, the utilization rate of the light source is still low.

SUMMARY OF THE INVENTION

Based on the above-mentioned deficiencies in the prior art, the present application proposes to modify the electric field aligner on the outer side of the quantum rod body, so that the quantum rod has electric field sensitivity, and then it is easy to realize the orientation of the quantum rod induced by the electric field; the liquid crystal display using the quantum rod The panel has high light source and energy utilization.

The present application provides a quantum rod, comprising: a quantum rod main body, and an electric field aligner modified on the outside of the quantum rod main body, and the electric field aligner is used to improve the dielectric anisotropy of the quantum rod main body, so that the The quantum rods are electric field sensitive.

According to an embodiment of the present application, the electric field aligner is modified on the side surface of the quantum rod body.

According to an embodiment of the present application, the electric field aligner is modified on the end of the quantum rod body.

According to an embodiment of the present application, the electric field aligners are gold nanoparticles.

According to an embodiment of the present application, the quantum rod body is composed of a light-emitting core and an inorganic protective shell surrounding 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, a cadmium - one or more of selenium-tellurium compounds and indium-arsenic compounds, the electrodeless protective shell is composed of cadmium-sulfur compounds, zinc-selenium compounds, zinc-cadmium-sulfur compounds, zinc-sulfur compounds, zinc-oxygen compounds one or more of the compounds.

The present application also provides a method for manufacturing a quantum rod, comprising the following steps:

preparing a solution containing the quantum rod host;

preparing a solution containing an electric field aligner precursor;

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

According to an embodiment of the present application, the method for preparing a solution containing a quantum rod body is:

configuring a first solution comprising a cadmium-sulfur compound or/and a precursor of a cadmium-selenium compound and sulfur;

configuring a second solution comprising n-trioctylphosphine oxide, n-trioctylphosphine and phosphonic acid;

mixing and reacting the first solution and the second solution to generate a third solution comprising the quantum rod body;

separating the quantum rod body from the third solution;

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

According to an embodiment of the present application, the method for configuring the solution containing the electric field aligner precursor is:

P-dodecylamine or octadecylamine or trioctylamine is thoroughly mixed with dodecyldimethylammonium bromide and gold chloride in a toluene solution to obtain the solution containing the electric field alignment compound precursor.

According to an embodiment of the present application, the conditions for the mixing and reaction of the solution containing the quantum rod body and the solution containing the electric field aligner precursor are:

Temperature conditions: 0 degrees Celsius to 40 degrees Celsius;

Lighting conditions: laser irradiation, wavelength 473 nm, power 40 mW.

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

Backlight module;

The quantum rod film layer is arranged on the light-emitting surface of the backlight module, and includes a matrix layer and quantum rods oriented on the matrix layer, and the quantum rods are the above-mentioned quantum rods, or the above-mentioned quantum rods. The quantum rod produced by the quantum rod production method described above;

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

The beneficial effects of the present application are: the quantum rod provided by the present application comprises a quantum rod body and an electric field aligner, and the electric field aligner is used to make the quantum rod have electric field sensitivity, so that the quantum rod can be easily realized under the action of an electric field Alignment; the liquid crystal display panel provided by the present application 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 drawings

In order to more clearly illustrate the embodiments or technical solutions in the prior art, the following briefly introduces the accompanying drawings that are used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only for application In some embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

1 is a first structural schematic diagram 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;

3 is a flowchart of a method for manufacturing a quantum rod provided in an embodiment of the present application;

FIG. 4 is a schematic structural diagram 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 .

Detailed ways

The following descriptions of the various embodiments refer to the accompanying drawings to illustrate specific embodiments in which the present application may be practiced. Directional terms mentioned in this application, such as [upper], [lower], [front], [rear], [left], [right], [inner], [outer], [side], etc., are only for reference Additional schema orientation. Therefore, the directional terms used are used to describe and understand the present application, rather than to limit the present application. In the figures, structurally similar elements are denoted by the same reference numerals.

The embodiment of the present application provides a quantum rod. By modifying the electric field aligner outside the quantum rod main body of the quantum rod, the quantum rod has electric field sensitivity, and then the quantum rod can be induced to be oriented and arranged by the action of the electric field, which is beneficial Used in liquid crystal display panels to improve the light source and energy utilization of the liquid crystal display panels.

As shown in FIG. 1 and FIG. 2 , FIG. 1 and FIG. 2 are schematic diagrams of two structures of the quantum rod provided in the embodiment of the present application. The quantum rod 10 provided in the embodiment of the present application includes a quantum rod body 11 and an electric field aligner 12 modified on the outer side of the quantum rod body 11 , and the electric field aligner 12 is used to improve the dielectric anisotropy of the quantum rod body 11 . anisotropy, so that the quantum rod 10 has electric field sensitivity. It should be noted that the so-called "dielectric anisotropy" refers to the polarization characteristics of the dielectric under the action of an electric field, the internal charges are oriented and concentrated to the ends, and the corresponding ends of the dielectric are oppositely charged; the so-called "" "Electrical field sensitivity" refers to the property of a dielectric in an electric field, which is directionally distributed under the action of the electric field; the stronger the dielectric anisotropy, the stronger the electric field sensitivity; for this application, the quantum rod 10 is the In the dielectric, by modifying the electric field aligner 12 on the surface of the quantum rod main body 11, the quantum rod 10 exhibits stronger dielectric anisotropy, so that in the electric field, the quantum rod 10 is affected by the electric field. The ability to align under the action of an electric field is also stronger.

In addition, it should be noted that the so-called electric field aligner 12 is modified on the outside of the quantum rod body 11 means that the electric field aligner 12 can be connected with the quantum rod body 11 through chemical bonds, or the electric field aligner 12 The connection with the quantum rod body 11 may also be formed by physical overlapping.

According to an embodiment of the present application, as shown in FIG. 1 , the electric field aligner 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 direction 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 aligner 12 and the quantum rod body 11. By modifying the electric field aligner 12 on the side of the quantum rod body 11, the quantum rod body is increased. The electrical polarity of the quantum rods 11 under the electric field, thereby improving the dielectric anisotropy of the quantum rod body 11, is beneficial to the directional arrangement of the quantum rods 10 under the action of the electric field.

Optionally, the electric field aligners 12 are distributed asymmetrically on the outside of the quantum rod body 11 to further improve the electrical polarity of the quantum rod body 11 under the action of the electric field.

According to an embodiment of the present application, as shown in FIG. 2 , the electric field aligner 12 can also be modified on the end of the quantum rod body 11 . It should be understood that the quantum rod body 11 has a one-dimensional linear structure, and the two end faces of the quantum rod body 11 are the ends of the quantum rod body 11 . There is a large dielectric difference between the electric field aligner 12 and the quantum rod main body 11. By modifying the electric field aligner 12 on the end of the quantum rod main body 11, the quantum rod main body is The electrical polarity 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 aligner 12 only exists at one end of the quantum rod body 11 , further increasing the dielectric difference between the two ends of the quantum rod body 11 , so that the dielectric properties of the quantum rod body 11 are isotropic. The maximum anisotropy is beneficial to realize the directional arrangement of the quantum rods 10 under the action of a lower electric field.

Optionally, the electric field aligner 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 opposite direction to the direction of the electric field under the action of the electric field, thus showing greater electrical polarity; in this application, The size of the gold nanoparticles is smaller than the size of the quantum rod body 11 , so that the quantum rod body 11 exhibits an electric polarization phenomenon with local charge concentration under the action of an electric field, which is beneficial to the quantum rod 10 directional arrangement.

Optionally, the quantum rod body 11 can be a composite quantum rod, such as a composite quantum rod of a cadmium-selenium compound and a silica hydrogel, a perovskite quantum rod, or a core-shell quantum rod. The quantum rod of the structure; wherein, the quantum rod of the core-shell structure is composed of a light-emitting core and an electrodeless protective shell surrounding the light-emitting core, and the light-emitting core is composed of zinc-cadmium-selenium compound, indium-phosphorus compound, cadmium - one or more of selenium compounds, cadmium-selenium-tellurium compounds, and indium-arsenic compounds, and the electrodeless protective shell is composed of cadmium-sulfur compounds, zinc-selenium compounds, zinc-cadmium-sulfur compounds, zinc-sulfur compounds one or more of compounds, zinc-oxygen compounds; the quantum rod body 11 is preferably a quantum rod with the core-shell structure, so that the quantum rod body 11 has the potential to generate greater electrical polarity .

To sum up, the quantum rod provided in the embodiment of the present application includes a quantum rod body and an electric field aligner, and the electric field aligner is used to make the quantum rod have electric field sensitivity, and then the quantum rod can be induced to be oriented and arranged by the action of the electric field , which is beneficial to be used in liquid crystal display panels, so as to improve the light source and energy utilization rate of the liquid crystal display panels.

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

As shown in Figure 3, the method for manufacturing a quantum rod includes the following steps:

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

configuring a first solution containing a cadmium-sulfur compound or/and a precursor of a cadmium-selenium compound and sulfur; configuring 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. Finally, the quantum rod main body separated from the third solution is dispersed in a toluene solution, so as to obtain the solution containing the quantum rod main body.

Step S2 , preparing a solution containing the electric field aligner precursor, which specifically includes the following operation steps.

Take a certain amount of p-dodecylamine or octadecylamine or trioctylamine, mix thoroughly with dodecyldimethylammonium bromide and gold chloride in toluene solution, and continuously use ultrasonic vibration during the mixing process to remove Accelerate the mixing until the mixed solution changes from dark brown to golden color, that is, the solution containing the precursor of the electric field aligner is obtained.

Step S3, mixing the solution containing the quantum rod main body with the solution containing the electric field aligner precursor, reacting under illumination and/or heating conditions, and the electric field aligner precursor is generated on the surface of the quantum rod main body electric field aligner to obtain the quantum rod.

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

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

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

Further, the electric field aligners prepared by the above method are gold nanoparticles.

To sum up, the quantum rod manufacturing method provided in the embodiment of the present application includes the preparation process of the quantum rod main body and the preparation process of the electric field alignment object on the quantum rod main body, so that the finally prepared quantum rod contains the quantum rod main body. and the electric field aligner modified on the outside of the quantum rod main 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 the 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 quantum rods disposed on the light-emitting surface of the backlight module 21 . The film layer 22 and the liquid crystal panel 23 disposed on the quantum rod film layer 22 .

The quantum rod film layer 22 includes a matrix layer 221 and quantum rods 10 oriented and arranged on the matrix layer 221, and the quantum rods 10 are the quantum rods provided by the above-mentioned embodiments of the application, or the above-mentioned embodiments of the application. The quantum rod produced by the provided quantum rod production method.

During the manufacturing process of the quantum rod film layer 22, the solution containing the quantum rods 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 rods 10. The alignment is realized under the action of the electric field, and the manufacturing 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 a quantum rod film layer composed of the quantum rod provided by the embodiment of the present application or the quantum rod prepared by the quantum rod manufacturing method provided by the embodiment of the present 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 of the liquid crystal display panel.

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

Claims (10)

1. A quantum rod, characterized in that, comprising: a quantum rod main body and an electric field aligner modified on the outside of the quantum rod main body, and the electric field aligner is used to improve the dielectric anisotropy of the quantum rod main body , making the quantum rods electric field sensitive. 2 . The quantum rod according to claim 1 , wherein the electric field aligner is decorated on the side surface of the quantum rod main body. 3 . 3 . The quantum rod according to claim 1 , wherein the electric field aligner is decorated on the end of the quantum rod main body. 4 . 4 . The quantum rod according to claim 1 , wherein the electric field aligners are gold nanoparticles. 5 . 5 . The quantum rod according to claim 1 , wherein the quantum rod main body is composed of a luminescent core and an inorganic protective shell surrounding the luminescent core, and the luminescent core is composed of a zinc-cadmium-selenium compound, an indium- One or more of phosphorus compounds, cadmium-selenium compounds, cadmium-selenium-tellurium compounds, and indium-arsenic compounds, and the electrodeless protective shell is composed of cadmium-sulfur compounds, zinc-selenium compounds, zinc-cadmium-sulfur compounds , one or more of zinc-sulfur compounds and zinc-oxygen compounds. 6. A method for making a quantum rod, comprising the following steps: preparing a solution containing the quantum rod host; preparing a solution containing an electric field aligner precursor; Mixing the solution containing the quantum rod main body and the solution containing the electric field aligner precursor, and reacting under light and/or heating conditions, the electric field aligner precursor generates the electric field aligner on the surface of the quantum rod main body , to obtain the quantum rod. 7. The method for making a quantum rod according to claim 6, wherein the method for preparing a solution comprising a quantum rod main body is: configuring a first solution comprising a cadmium-sulfur compound or/and a precursor of a cadmium-selenium compound and sulfur; configuring a second solution comprising n-trioctylphosphine oxide, n-trioctylphosphine and phosphonic acid; mixing and reacting the first solution and the second solution to generate a third solution comprising the quantum rod body; separating the quantum rod body from the third solution; The quantum rod main body is dispersed in a toluene solution to obtain the quantum rod main body-containing solution. 8. The method for fabricating a quantum rod according to claim 6, wherein the method for configuring the solution comprising the electric field aligner precursor is: P-dodecylamine or octadecylamine or trioctylamine is thoroughly mixed with dodecyldimethylammonium bromide and gold chloride in a toluene solution to obtain the solution containing the electric field alignment compound precursor. 9 . The method for producing quantum rods according to claim 6 , wherein the conditions for the mixed reaction of the solution containing the quantum rod main body and the solution containing the electric field aligner precursor are: 10 . Temperature conditions: 0 degrees Celsius to 40 degrees Celsius; Lighting conditions: laser irradiation, wavelength 473 nm, power 40 mW. 10. A liquid crystal display panel, comprising: Backlight module; The quantum rod film layer is arranged on the light-emitting surface of the backlight module, and includes a matrix layer and quantum rods oriented and arranged on the matrix layer, and the quantum rods are as claimed in any one of claims 1-5. The described quantum rod, or the quantum rod made by the method for making a quantum rod according to any one of claims 6-9; The liquid crystal panel is arranged on the quantum rod film layer.

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