CN114621474A - Perovskite quantum dot polarized light-emitting film and preparation method and application thereof - Google Patents

Perovskite quantum dot polarized light-emitting film and preparation method and application thereof Download PDF

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CN114621474A
CN114621474A CN202011470334.7A CN202011470334A CN114621474A CN 114621474 A CN114621474 A CN 114621474A CN 202011470334 A CN202011470334 A CN 202011470334A CN 114621474 A CN114621474 A CN 114621474A
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伏睿
柏泽龙
钟海政
夏本利
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Zhijing Technology Beijing Co ltd
Beijing Institute of Technology BIT
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Beijing Institute of Technology BIT
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Abstract

The application discloses a perovskite quantum dot polarized light-emitting film and a preparation method and application thereof, wherein the perovskite quantum dot polarized light-emitting film comprises a polymer and perovskite quantum dots; the perovskite quantum dots are embedded in the polymer; the polymer is polyvinyl alcohol. The polarized light-emitting diaphragm prepared by the perovskite quantum dot polarized light-emitting film can play a role of polarized light emission when being used in display equipment, simultaneously reduces an independent quantum dot device layer in a display device, can save cost and reduce thickness, improves display color gamut, and improves display brightness.

Description

Perovskite quantum dot polarized light-emitting film and preparation method and application thereof
Technical Field
The application relates to a perovskite quantum dot polarized light-emitting film and a preparation method and application thereof, belonging to the field of materials and preparation thereof.
Background
Polarized light is an important constituent in liquid crystal displays. In the display panel, two layers of polaroids are arranged on two sides of the liquid crystal layer, the polarization directions of the two polaroids are mutually vertical, and the backlight becomes polarized light after being polarized by the lower polarizer; the arrangement of the liquid crystal molecules can be deflected and changed under the action of an electric field, and the change can change the polarization direction of an incident beam, so that the change is shown as the change of light intensity, namely brightness and darkness after the polarization analysis of the upper polarizer.
As a new semiconductor material, the quantum dot has the advantages of narrow luminescent wave peak, adjustable wavelength and the like due to the existence of the size confinement effect, so that compared with the traditional fluorescent material, the quantum dot material has great advantages and is a more excellent luminescent material. In recent years, quantum dot luminescent materials are applied to backlight light sources of liquid crystal display devices, so that the color gamut of the liquid crystal display devices can be remarkably improved, and the colors can be more truly reduced.
Different from the traditional quantum dots with core-shell structures, the optical properties of the perovskite quantum dots, including emission wavelength, absorption coefficient and the like, have no size dependence, are only related to perovskite components, and can be prepared by a solution method.
The polymer film of the perovskite quantum dots can show a certain polarized light-emitting characteristic after being stretched. In general, the perovskite quantum dot thin film is grown in situ by a one-step reaction and coating method, i.e. the perovskite quantum dot precursor raw material and polymer powder are added into a solvent to prepare a solution, and then the solution is coated to form a film, heated and dried to form a quantum dot film. The perovskite quantum dot in-situ one-step reaction method is difficult to be compatible with the existing polarizer production and manufacturing process. In the manufacturing process of the polaroid, a PVA original film used for stretching is a water-soluble material and resists most of organic solvents, the stretching process of the PVA film is carried out in aqueous solution, the perovskite quantum dots are prepared by an in-situ one-step reaction method, most of used precursors need to be dispersed by organic solvents, water cannot be used for dissolution and dispersion, and the two methods are mutually inconsistent and incompatible.
Disclosure of Invention
The application provides a perovskite quantum dot polarization luminescent film, accomplish among the polymer (polyvinyl alcohol PVA) that the polaroid was used with perovskite quantum dot, the PVA membrane has undergone pretreatment, washing, swell, tensile, dip-dyeing (the mode such as water tank, aqueous solution coating or steam fumigation), pleochromization, polaroid processes such as stoving, at last with TAC membrane (triacetate fiber film) looks complex, through PSA (pressure sensitive adhesive) glue coating, make quantum dot polarization luminescent sheet from a series of such as type membrane and protection film are attached. The quantum dot polarized light-emitting sheet can reduce the quantum dot layer in the display device, reduce the thickness, save the cost and improve the brightness.
According to a first aspect of the present application, there is provided a perovskite quantum dot polarized light emitting thin film comprising a polymer and perovskite quantum dots; the perovskite quantum dots are embedded in the polymer;
the polymer is polyvinyl alcohol.
Optionally, in the perovskite quantum dot polarized light emitting film, the mass content of perovskite quantum dots is 0.2-50%.
Optionally, in the perovskite quantum dot polarized light-emitting thin film, the upper limit of the mass content of perovskite quantum dots is independently selected from 50%, 40%, 30%, 20%, 10%, 5%, 1%, 0.5%, and the lower limit is independently selected from 0.2%, 40%, 30%, 20%, 10%, 5%, 1%, 0.5%.
Optionally, the perovskite quantum dot has a chemical formula as shown in formula I:
AMX3formula I
Wherein A comprises Cs+、Rb+、CH3NH3 +、CH3(NH2)2 +At least one of; m is a metal ion; the metal ion is selected from Pb2+、Sn2+At least one of;
x is selected from Cl-、Br-、I-、SCN-At least one of (1).
Optionally, the perovskite quantum dot polarized light-emitting thin film further comprises a compound I; the compound I is embedded in the polymer; the chemical formula of the compound I is shown as the formula II:
AQ formula II
Wherein Q comprises NO3 -,CH3COO-At least one of (a).
Optionally, the polarization degree of the perovskite quantum dot polarized light-emitting film is 0.25-0.75; the luminous efficiency is 60-100%.
Optionally, the perovskite quantum dot polarized light emitting thin film has an upper limit of polarization independently selected from 0.75, 0.65, 0.55, 0.45, 0.35 and a lower limit independently selected from 0.25, 0.65, 0.55, 0.45, 0.35.
Optionally, the perovskite quantum dot polarized light emitting thin film has an upper limit of light emitting efficiency independently selected from 100%, 90%, 80%, 70%, and a lower limit independently selected from 60%, 90%, 80%, 70%.
Optionally, the transmittance of the perovskite quantum dot polarized light-emitting film is 30-100%; the emission spectrum range is 400-800 nm;
preferably, the thickness of the perovskite quantum dot polarized light-emitting film is 15-200 μm.
Optionally, the perovskite quantum dot polarized light emitting thin film has an upper limit of transmittance independently selected from 100%, 90%, 80%, 70%, 60%, 50%, 40% and a lower limit independently selected from 30%, 90%, 80%, 70%, 60%, 50%, 40%.
Optionally, the upper limit of the thickness of the perovskite quantum dot polarized light-emitting thin film is independently selected from 200 μm, 150 μm, 100 μm and 80 μm, and the lower limit is independently selected from 15 μm, 150 μm, 100 μm and 80 μm.
According to a second aspect of the present application, there is provided a method for preparing the above perovskite quantum dot polarized light emitting thin film, the method comprising:
(1) preparing a film A from a raw material containing a precursor I and a polymer by a tape casting method;
(2) placing the film A in an aqueous solution containing a precursor II, stretching, dip-dyeing and drying to obtain the perovskite quantum dot polarized light-emitting film; or the like, or, alternatively,
putting the film A into an aqueous solution containing a precursor II, dip-dyeing, stretching and drying to obtain the perovskite quantum dot polarized light-emitting film;
the chemical formula of the precursor I is selected from AX and MQ2Any one of (a);
the chemical formula of the precursor II is selected from AX and MQ2Any one of (a);
wherein the chemical formulas of the precursor I and the precursor II are different from each other.
Optionally, the stretching is selected from any one of wet stretching and dry stretching.
Optionally, the step (2) comprises:
washing the film A with water, placing the film A in an aqueous solution containing a precursor II after swelling, stretching, dip-dyeing and drying to obtain the perovskite quantum dot polarized light-emitting film; or the like, or, alternatively,
and washing the film A with water, swelling, putting the film A into an aqueous solution containing a precursor II, dip-dyeing, stretching and drying to obtain the perovskite quantum dot polarized light-emitting film.
Optionally, the exhaust dyeing is selected from any one of water bath, aqueous solution coating or steam fumigation dyeing.
In particular, the preparation process of the existing perovskite quantum dot polymer thin film generally adopts a solution coating method, which cannot prepare thicker thin film (>50 μm) and this method requires the use of an organic solvent to dissolve and disperse the quantum dot precursor, the PVA original film, which is a polymer for polarization, is resistant to the organic solvent, and thus this method is difficult to be compatible with the conventional polarizer manufacturing process. The present application uses a two-step approach to solve the above-mentioned problem of dispersion solvent incompatibility: firstly, in the production process of a polyvinyl alcohol PVA (polyvinyl alcohol) raw film, an inorganic component MQ in a perovskite precursor2Added to PVA master batchPerforming the following steps; then, the PVA film stock is subjected to stretching dip dyeing (a method such as water bath, aqueous solution coating, or steam fumigation dyeing), drying, bonding encapsulation, and the like using an AX aqueous solution.
The perovskite quantum dot material in the application is AMX3Structural formula (I), wherein A ═ MA+(CH3NH3 +),FA+(CH3(NH2)2 +,Cs+，M＝Pb2+,Sn2+，X＝I-,Br-,Cl-,SCN-The reaction equation is 3AX + MQ2→AMX3+2AQ, where Q ═ NO3 -,CH3COO-(Ac-)。
Optionally, the drying conditions are: the temperature is 10-150 ℃; the time is 0.02-2 h.
Optionally, the upper temperature limit of the drying is independently selected from 150 ℃, 130 ℃, 110 ℃, 90 ℃, 70 ℃, 50 ℃, 30 ℃, and the lower temperature limit is independently selected from 10 ℃, 130 ℃, 110 ℃, 90 ℃, 70 ℃, 50 ℃, 30 ℃.
Optionally, the upper time limit of the drying is independently selected from 2h, 1.6h, 1h, 0.5h, 0.1h, 0.05h, and the lower time limit is independently selected from 0.02h, 1.6h, 1h, 0.5h, 0.1h, 0.05 h.
Optionally, the step (1) is selected from any one of the following steps;
(1-1) melting raw materials containing the precursor I and the polymer, and preparing a film A by an extrusion casting method;
(1-2) the raw material containing the precursor I, the polymer and the water is extruded and cast to prepare the film A.
Optionally, the extrusion casting method comprises the steps of:
mixing the raw materials, crushing and sieving to obtain powder below 100 meshes, adding quantitative ultrapure water, heating to 80-100 ℃ to dissolve to obtain stock solution, metering the stock solution, feeding the stock solution into a screw extruder, extruding and casting through a T-shaped die, drying through a roller by using hot air at 80-100 ℃ to form the film A.
Specifically, to realize good polarization characteristics, it is essential that the dichroic material has good anisotropy in microscopic spatial arrangement, and thus the polymer matrix itself is required to have good regularity. In addition, for application as an optical material, the polymer matrix is required to have excellent optical transmittance. Based on the two points, the inventor selects a polymer selection scheme of polyvinyl alcohol PVA, the polymer selection scheme has high optical transparency (> 90%), high stretching magnification (>5 times), and excellent molecular chain regularity after stretching, and can help dichroic materials to realize anisotropy and finally realize polarization characteristics.
In particular, the perovskite quantum dot material has good luminescence characteristics, and higher high-vibration luminescence characteristics can be realized by regularly and directionally arranging the perovskite quantum dot material. However, due to the difference in solubility, the in-situ preparation process of the traditional perovskite quantum dot by using an organic solvent method cannot be extended to polyvinyl alcohol (PVA), so that the two-step method is provided for realizing the preparation of the perovskite quantum dot polarized light-emitting film.
According to a third aspect of the present application, there is provided a perovskite quantum dot polarized light emitting sheet comprising a perovskite quantum dot polarized light emitting thin film and an optical thin film;
at least two optical films are arranged; the perovskite quantum dot polarized light-emitting film is arranged between the optical films;
the perovskite quantum dot polarized light-emitting film is at least one selected from the perovskite quantum dot polarized light-emitting film and the perovskite quantum dot polarized light-emitting film prepared by the method.
Optionally, the optical film is selected from at least one of a triacetate fiber film, a cyclic olefin copolymer film and a PMMA film.
The invention provides a perovskite quantum dot polarized light-emitting film and a manufacturing method thereof. The quantum dot polarized light-emitting film is a stretched polyvinyl alcohol PVA film, wherein the optical material playing a dichroism role is a perovskite quantum dot prepared by two-step in-situ growth. The specific manufacturing method comprises the following three parts: 1. preparing a polyvinyl alcohol PVA film containing inorganic components in the perovskite precursor by using an extrusion or casting method; 2. stretching and dyeing the polyvinyl alcohol PVA film by using an aqueous solution of an organic component in the perovskite precursor; 3. and packaging the quantum dot polarized light-emitting film.
According to a final aspect of the present application, there is provided a use of the above perovskite quantum dot polarized light emitting sheet in a liquid crystal display device.
The beneficial effects that this application can produce include:
(1) the method adopts a melt extrusion method or dissolution with water to prepare the precursor (AX, MQ) containing part with proper concentration and good uniformity2Any one of the above) polyvinyl alcohol PVA raw film can provide crystallization sites with proper concentration for the subsequent in-situ growth of perovskite quantum dots;
(2) while stretching the PVA raw film, the remaining precursors (AX, MQ) are introduced2Any one of the above, and different from the partial precursors), the prepared film is used in a display device, which not only can play a role of polarized light emission, but also reduces the number of independent quantum dot device layers in the display device, thereby saving the cost, reducing the thickness, improving the display color gamut, and improving the display brightness.
Drawings
FIG. 1 shows the preparation of MQ containing precursors by casting2Schematic view of PVA film A of (1);
FIG. 2 is a schematic drawing showing that a film A is washed with water, swelled, placed in an aqueous solution containing a precursor AX, dip-dyed, and stretched;
FIG. 3 is a schematic diagram of the structure of the final product, a stretched film of PVA containing perovskite quantum dots, where QD is an acronym for quantum dots;
FIG. 4 shows the results of a polarization degree test according to one embodiment;
FIG. 5 shows the emission spectrum of the example after excitation by a blue backlight of four 450 nm.
Detailed Description
The present application will be described in detail with reference to examples, but the present application is not limited to these examples.
Unless otherwise specified, the raw materials and solvents in the examples of the present application were all purchased commercially.
1. The preparation of the PVA film containing partial precursor, the film form is shown in FIG. 1, and the following two modes can be adopted:
a) mixing part of the precursor with PVA material, heating to melt, stirring, cooling, extruding and casting to form film;
b) mixing part of the precursor and raw materials, dissolving in water, stirring, and casting with solvent to obtain a film, or pumping out the solvent and then extruding and casting to obtain a film;
generation of perovskite quantum dots in PVA protofilms
Referring to the prior polarizer production process, a PVA original film containing partial precursor is washed with water and swelled, then dip-dyed (in a water tank, water solution coating or steam fumigation dyeing mode, etc.) by using the water solution of the residual precursor, stretched and dried, and in the drying process, quantum dots are gradually crystallized and grown along with the separation of solvent water, wherein the structural formula of the quantum dots is ABX3. During the dyeing process, the remaining precursor penetrates into the PVA film, combining with part of the precursor, as shown in fig. 2.
Wherein the remaining precursor is not the same as the partial precursor in the first step.
The specific stretching and dip dyeing sequence can be as follows:
a) first stretching and then dip dyeing
b) Dip dyeing first and then drawing
The stretching method can be as follows:
A. wet-process stretching process
B. Dry-process drawing process
1. In-situ growth process of perovskite quantum dots
In the drying process, the quantum dots gradually crystallize and grow along with the separation of the solvent water, as shown in fig. 3.
The degree of polarization was tested using a degree of polarization testing system with a circularly polarized light excitation light source, which consists of a SpectraScan PR655 spectrometer from Photo Research, USA, a 405nm laser from Ningbo Telming laser technology, Inc., and a Wuhan Youguese 1/4 slide.
Example one
(1) Preparation of a PVA raw film containing a partial precursor: 0.012g of Pb (Ac)2And (3) blending the precursor and 1.5g of PVA raw material, crushing and sieving to obtain powder below 100 meshes, adding 135g of ultrapure water, heating to 85 ℃ to dissolve to obtain stock solution, casting the solution on PET, and drying for 0.05h by using 100 ℃ hot air to obtain the PVA raw film.
(2) Generation of perovskite quantum dots in the PVA protomembrane: referring to the prior art of producing polaroids, the polaroid contains Pb2+Washing and swelling PVA film as precursor, and using MA-containing PVA film+Dip dyeing (water tank, aqueous solution coating or steam fumigating dyeing) with precursor aqueous solution (MABr solution with mass fraction of 5.5%), stretching, and oven drying, wherein quantum dots gradually crystallize and grow with the separation of solvent water during oven drying, and the structural formula is MAPbBr3. During dyeing, the remaining precursor penetrates into the PVA film, together with Pb2+The precursors are combined.
(3) The obtained perovskite quantum dot polarized luminescent film (wherein the mass content of the perovskite quantum dot is 1.2 percent, and the thickness is 15 mu m)
And attaching PMMA films on two sides to obtain the perovskite quantum dot polarized light emitting sheet.
Example two
(1) Preparation of a PVA raw film containing a partial precursor: 1.12g of Pb (Ac)2The precursor and 140g of PVA raw material are mixed, heated and melted, stirred, cooled, extruded and cast to prepare the PVA original film.
(2) Generation of perovskite quantum dots in the PVA protomembrane: referring to the prior art of producing polaroids, the polaroid contains Pb2+Washing PVA film with water, swelling, dip dyeing (water tank, water solution coating, or steam fumigating) with precursor water solution (FABr solution with mass fraction of 6%), stretching, and oven drying, wherein quantum dots gradually crystallize and grow with the separation of solvent water during oven drying process, and the structural formula is FAPBBr3. During dyeing, the remaining precursor penetrates into the PVA film, together with Pb2+The precursors are combined.
(3) The obtained perovskite quantum dot polarized luminescent film (wherein the mass content of the perovskite quantum dot is 1.2 percent, and the thickness is 200 mu m)
And attaching triacetate fiber films to the two sides to obtain the perovskite quantum dot polarized light-emitting sheet.
EXAMPLE III
(1) Preparation of a PVA raw film containing a partial precursor: 0.2g of Pb (NO)3)2And (3) blending the precursor and 25g of PVA raw material, crushing and sieving to obtain powder below 100 meshes, adding 135g of ultrapure water, heating to 85 ℃ to dissolve to obtain stock solution, casting the solution on PET, and drying for 0.05h by using 100 ℃ hot air to obtain the PVA raw film.
(2) Generation of perovskite quantum dots in the PVA protomembrane: referring to the prior art of producing the polarizer, the polarizer contains Pb2+The PVA raw film as a precursor was washed with water, swollen, and then used with FA-containing PVA+Dip dyeing (water tank, aqueous solution coating or steam fumigating) with aqueous solution (FABr solution with mass fraction of 6%), stretching, and oven drying, wherein the quantum dots gradually crystallize and grow with the separation of solvent water during oven drying process, and the structural formula is FAPBR3. During dyeing, the remaining precursor penetrates into the PVA film, together with Pb2+The precursors are combined.
(3) The mass content of the perovskite quantum dots in the obtained perovskite quantum dot polarized luminescent film is 1.5 percent, and the thickness is 35um)
And attaching PMMA films on two sides to obtain the perovskite quantum dot polarized light emitting sheet.
Example four
(1) Preparation of a PVA raw film containing partial precursor: 5.7g of Pb (Ac)2And (3) blending the precursor and 25g of PVA raw material, crushing and sieving to obtain powder below 100 meshes, adding 135g of ultrapure water, heating to 85 ℃ to dissolve to obtain stock solution, casting the solution on PET, and drying for 0.1h by using 100 ℃ hot air to obtain the PVA raw film.
(2) Generation of perovskite quantum dots in the PVA protomembrane: referring to the prior art of producing polaroids, the polaroid contains Pb2+The PVA raw film as a precursor was washed with water, swelled, and then used with a solution containing Cs+The precursor was immersed in an aqueous solution (CsI solution with a mass fraction of 16%)Dyeing (water tank, aqueous solution coating or steam fumigation dyeing), stretching, and oven drying, wherein the quantum dots gradually crystallize and grow with the separation of solvent water during oven drying process, and the structural formula is CsPbI3. During dyeing, the remaining precursor penetrates into the PVA film, together with Pb2+The precursors are combined.
(3) The obtained perovskite quantum dot polarized luminescent film (wherein the mass content of the perovskite quantum dot is 50 percent, and the thickness is 38um)
And attaching PMMA films on two sides to obtain the perovskite quantum dot polarized light emitting sheet.
EXAMPLE five
(1) Preparation of a PVA raw film containing a partial precursor: mixing 0.024g of Pb (Ac)2And (3) blending the precursor and 25g of PVA raw material, crushing and sieving to obtain powder below 100 meshes, adding 135g of ultrapure water, heating to 85 ℃ to dissolve to obtain stock solution, casting the solution on PET, and drying for 0.1h by using 100 ℃ hot air to obtain the PVA raw film.
(2) And (3) generation of perovskite quantum dots in the PVA original film: referring to the prior art of producing the polarizer, the polarizer contains Pb2+Washing and swelling a PVA (polyvinyl acetate) original film of the precursor, dip-dyeing (in a water tank, water solution coating or steam fumigation dyeing mode or the like) the PVA original film by using an RbI water solution with the mass fraction of 6%, stretching, and drying after that, wherein in the drying process, quantum dots are gradually crystallized and grown along with the separation of solvent water, and the structural formula of the PVA original film is RbPbI3. During dyeing, the remaining precursor penetrates into the PVA film, together with Pb2+The precursors are combined.
(3) The obtained perovskite quantum dot polarized luminescent film (wherein the mass content of the perovskite quantum dot is 0.2 percent, and the thickness is 40um)
And attaching PMMA films on two sides to obtain the perovskite quantum dot polarized light emitting sheet.
EXAMPLE six
The perovskite quantum dot polarized light-emitting sheet prepared in the first to fifth examples was subjected to the polarization degree test, which is represented by the sample prepared in the first example, the test result in the first example is shown in fig. 4, according to the test angle-luminous intensity data,calculating the degree of polarization P ═ Imax-Imin)/(Imax+Imin)＝0.33。
The perovskite quantum dot polarized light-emitting sheet prepared in the first to fifth examples is subjected to a wavelength-luminous intensity test, a sample prepared in the second example is taken as a typical representative, and the test result in the second example is shown in fig. 5, and according to the test wavelength-luminous intensity data result, the green fluorescence quantum dot efficiency under the excitation of 450nm blue light is 0.684.
EXAMPLE seven
The polarizing plates obtained in examples one to five were cut into pieces of 5cm × 5cm for testing, the test environment temperature being 21 ℃, the relative humidity being 50% RH; the test experimental equipment comprises a SpectraScan PR655 spectrometer of Photo Research company in the United states, a 405nm laser of Ningbo Teling laser technology Co., Ltd, 1/4 glass slides of Wuhan Youmi science and technology Co., Ltd and a universal liquid crystal display panel (9 inches), and finally the test results are obtained and are shown in Table 1:
TABLE 1
Figure BDA0002833246310000101
The table shows that the quantum dot polarized light-emitting film prepared by the method has certain improvement on optical transmittance after being stretched, shows obvious polarization characteristic and plays a significant role in improving the final white field brightness.
Although the present application has been described with reference to a few embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application as defined by the appended claims.

Claims (10)

1. The perovskite quantum dot polarized light-emitting film is characterized by comprising a polymer and perovskite quantum dots; the perovskite quantum dots are embedded in the polymer;
the polymer is polyvinyl alcohol.
2. The perovskite quantum dot polarized light emitting film as claimed in claim 1, wherein the perovskite quantum dot polarized light emitting film contains 0.2-50% by mass of perovskite quantum dots.
3. The perovskite quantum dot polarized light emitting film as claimed in claim 1, wherein the chemical formula of the perovskite quantum dot is as shown in formula I:
AMX3formula I
Wherein A comprises Cs+、Rb+、CH3NH3 +、CH3(NH2)2 +At least one of; m is a metal ion; the metal ion is selected from Pb2+、Sn2+At least one of;
x is selected from Cl-、Br-、I-、SCN-At least one of (a).
4. The perovskite quantum dot polarized light emitting film as claimed in claim 1, wherein the degree of polarization of the perovskite quantum dot polarized light emitting film is 0.25 to 0.75; the luminous efficiency is 60-100%.
5. The perovskite quantum dot polarized light emitting film according to claim 1, wherein the perovskite quantum dot polarized light emitting film has a transmittance of 30 to 100%; the emission spectrum range is 400-800 nm;
preferably, the thickness of the perovskite quantum dot polarized light-emitting film is 15-200 mu m.
6. The method for preparing a perovskite quantum dot polarized light-emitting thin film as claimed in any one of claims 1 to 5, wherein the method comprises the following steps:
(1) preparing a film A from a raw material containing a precursor I and a polymer by a tape casting method;
(2) placing the film A in an aqueous solution containing a precursor II, stretching, dip-dyeing and drying to obtain the perovskite quantum dot polarized light-emitting film; or the like, or, alternatively,
putting the film A into an aqueous solution containing a precursor II, dip-dyeing, stretching and drying to obtain the perovskite quantum dot polarized light-emitting film;
the chemical formula of the precursor I is selected from AX and MQ2Any one of (a);
the chemical formula of the precursor II is selected from AX and MQ2Any one of (a);
wherein the chemical formulas of the precursor I and the precursor II are different from each other;
q comprises NO3 -,CH3COO-At least one of (1).
7. The production method according to claim 6, wherein the stretching is selected from any one of wet stretching and dry stretching;
preferably, the drying conditions are as follows: the temperature is 10-150 ℃; the time is 0.02-2 h;
preferably, the step (1) is selected from any one of the following steps;
(1-1) melting raw materials containing the precursor I and the polymer, and preparing a film A by an extrusion casting method;
(1-2) A film A was prepared by solution casting of a raw material containing the precursor I, a polymer and water.
8. A perovskite quantum dot polarized light-emitting sheet is characterized by comprising a perovskite quantum dot polarized light-emitting film and an optical film;
at least two optical films are arranged; the perovskite quantum dot polarized light-emitting film is arranged between the optical films;
the perovskite quantum dot polarized light-emitting thin film is at least one selected from the perovskite quantum dot polarized light-emitting thin film as defined in any one of claims 1 to 5 and the perovskite quantum dot polarized light-emitting thin film prepared by the method as defined in claim 6 or 7.
9. The perovskite quantum dot polarized light emitting sheet of claim 8, wherein the optical thin film is at least one selected from a triacetate fiber thin film, a cyclic olefin copolymer thin film, and a PMMA thin film.
10. Use of the perovskite quantum dot polarized light emitting sheet as claimed in claim 8 or 9 in a liquid crystal display device.
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