CN110591449A - Perovskite ink, preparation method thereof and backlight module - Google Patents
Perovskite ink, preparation method thereof and backlight module Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims description 8
- 239000002243 precursor Substances 0.000 claims abstract description 38
- 229910052736 halogen Inorganic materials 0.000 claims abstract description 32
- 150000002892 organic cations Chemical class 0.000 claims abstract description 29
- 229910052751 metal Inorganic materials 0.000 claims abstract description 17
- 239000002184 metal Substances 0.000 claims abstract description 17
- 239000002904 solvent Substances 0.000 claims abstract description 17
- 150000001768 cations Chemical class 0.000 claims abstract description 14
- 150000002367 halogens Chemical group 0.000 claims description 31
- 229910052794 bromium Inorganic materials 0.000 claims description 11
- 238000004020 luminiscence type Methods 0.000 claims description 9
- BAVYZALUXZFZLV-UHFFFAOYSA-N Methylamine Chemical compound NC BAVYZALUXZFZLV-UHFFFAOYSA-N 0.000 claims description 8
- 229910052801 chlorine Inorganic materials 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 229910052740 iodine Inorganic materials 0.000 claims description 7
- 239000011259 mixed solution Substances 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- PNKUSGQVOMIXLU-UHFFFAOYSA-N Formamidine Chemical compound NC=N PNKUSGQVOMIXLU-UHFFFAOYSA-N 0.000 claims description 4
- 125000003277 amino group Chemical group 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 125000000962 organic group Chemical group 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 229910052723 transition metal Inorganic materials 0.000 claims description 4
- 150000003624 transition metals Chemical class 0.000 claims description 4
- 238000001429 visible spectrum Methods 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
- 238000007641 inkjet printing Methods 0.000 abstract description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 125000005843 halogen group Chemical group 0.000 abstract 1
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical group CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 12
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 8
- 238000009792 diffusion process Methods 0.000 description 6
- 238000011161 development Methods 0.000 description 4
- 239000004973 liquid crystal related substance Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000005284 excitation Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000016776 visual perception Effects 0.000 description 1
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/30—Inkjet printing inks
- C09D11/38—Inkjet printing inks characterised by non-macromolecular additives other than solvents, pigments or dyes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
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- C09K2211/10—Non-macromolecular compounds
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- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
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- C09K2211/1003—Carbocyclic compounds
- C09K2211/1007—Non-condensed systems
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- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
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- C09K2211/1003—Carbocyclic compounds
- C09K2211/1011—Condensed systems
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- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
- C09K2211/10—Non-macromolecular compounds
- C09K2211/1018—Heterocyclic compounds
- C09K2211/1025—Heterocyclic compounds characterised by ligands
- C09K2211/1029—Heterocyclic compounds characterised by ligands containing one nitrogen atom as the heteroatom
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- C09K2211/1044—Heterocyclic compounds characterised by ligands containing two nitrogen atoms as heteroatoms
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The invention provides perovskite ink, which comprises a perovskite precursor and a solvent; the structural molecular formula of the perovskite precursor is (LX)2(SX)n‑1(MX2)n(ii) a Wherein L is a long-chain organic cation and S is a short-chain organic cation; m is a metal cation; x is halogen. The invention prepares the light guide plate with the self-luminous layer by the laminar perovskite ink with luminous performance and good processing performance through an ink-jet printing method, and the self-luminous layer is provided with a novel backlight module structure. The backlight module structure utilizes the advantages of high luminescent chromaticity purity, easy color adjustment and good light source uniformity of the perovskite mesh point microstructure, and can obviously improve the color gamut range and the color expressive force of the display equipment. Meanwhile, the perovskite has higher luminous efficiency and can effectively reduce energy consumption。
Description
Technical Field
The invention relates to the technical field of liquid crystal display, in particular to perovskite ink, a preparation method thereof and a backlight module.
Background
Liquid crystal display devices are widely used in various electronic products due to their advantages of being light, thin, small, and low in power consumption. The backlight module is an important component of the liquid crystal display device, and directly influences the color performance of the display equipment. With the development of lcd tvs toward large size and high color saturation, people have rich visual perception in order to realize better color saturation of the display, and thus, the design and development of new backlight modules become more and more important.
The current backlight module light source mainly comprises a blue light emitting diode and red and green luminous fluorescent powder. The light source obtained in this way generally has a wide emission peak, so the color gamut displayed by it is generally small. Therefore, the development of a light emitting material with a narrow peak width is of great significance to the development of display devices.
Perovskite is widely concerned by people as a luminescent material with high luminous efficiency, high chromatographic purity and adjustable luminescent wavelength. The color gamut and the color expressive force of the LCD display can be greatly improved by applying the liquid crystal display to the TFT-LCD. However, the traditional perovskite material has the characteristics of poor stability, difficult processing and the like, and practical application of the perovskite material is limited. The layered perovskite material not only has excellent optical performance of perovskite, but also has better film forming property and good stability due to the protection effect of long-chain organic cations.
Disclosure of Invention
In order to solve the technical problems, the invention provides perovskite ink, a preparation method thereof and a backlight module. The backlight module structure utilizes the advantages of high luminescent chromaticity purity, easy color adjustment and good light source uniformity of the perovskite mesh point microstructure, and can obviously improve the color gamut range and the color expressive force of the display equipment. Meanwhile, the perovskite has high luminous efficiency and can effectively reduce energy consumption.
In order to obtain the technical scheme, the invention provides perovskite ink which comprises a perovskite precursor and a solvent; the structural molecular formula of the perovskite precursor is (LX)2(SX)n-1(MX2)n(ii) a Wherein L is a long-chain organic cation and S is a short-chain organic cation; m is a metal cation; x is halogen; structural molecules of the perovskite precursorIn the formula, LX, SX and MX2The molecular mass ratio of (a) to (b) is 2: n-1: n, wherein 2<n<7。
Further, the metal cation is a fourth main group metal Pb2+、Ge2+、Sn2+And/or a transition metal Cu2+、Ni2+、Co2+、Fe2+、Mn2+、Cr2+、Pd2+、Cd2+、Eu2+、Yb2+Any one of the above; the short-chain organic cation is organic amine group methylamine, formamidine and K+、Rb+And Cs+Any one or a combination of more of; the halogen comprises at least one of Br, Cl and I; the long-chain organic cation is selected from any one or more of the following organic groups:
further, the luminescent color of the ink can be adjusted by adjusting the proportion of the three halogens, thereby realizing the coverage of luminescence in the full visible spectrum. When the perovskite ink is blue, the halogen is Cl element or the combination of the Cl element and Br element; when the perovskite ink is green, the halogen is Br element or the combination of Cl element and Br element or the combination of I element and Br element; when the perovskite ink is red, the halogen is an I element or a combination of the I element and a Br element.
The invention also provides a preparation method of the perovskite ink, which comprises the step of respectively containing LX, SX and MX2The raw materials are mixed to form a perovskite precursor, and the structural molecular formula of the perovskite precursor is (LX)2(SX)n-1(MX2)n(ii) a Wherein L is a long-chain organic cation, S is a short-chain organic cation, M is a metal cation, and X is halogen; adding the prepared perovskite precursor into a solvent to obtain a mixed solution(ii) a Heating the mixed solution to 60-80 ℃, and stirring for 1-2 hours until the perovskite precursor is completely dissolved; and reducing the temperature to room temperature to obtain the perovskite ink.
The present invention also provides a backlight module, comprising: a backlight source; a light guide plate, wherein a self-luminous layer is formed on the surface of the light guide plate, and the material of the self-luminous layer is the perovskite ink; a functional film layer facing the self-luminescent layer.
Further, the perovskite ink comprises a perovskite precursor and a solvent; the structural molecular formula of the perovskite precursor is (LX)2(SX)n-1(MX2)n(ii) a Wherein L is a long-chain organic cation and S is a short-chain organic cation; m is a metal cation; x is halogen; the structural molecular formulas of the perovskite precursor are LX, SX and MX2The molecular mass ratio is 2: n-1: n, wherein 2<n<7。
Furthermore, the self-luminous layer is provided with a plurality of self-luminous regions which are arranged in a lattice manner.
Furthermore, the self-luminous layer is provided with a red self-luminous region, a blue self-luminous region and a green self-luminous region, the light emitted by the backlight source is purple light, and white light is obtained after the purple light passes through the self-luminous layer.
Furthermore, the self-luminous layer is provided with a red self-luminous region and a green self-luminous region, the light emitted by the backlight source is blue light, and the white light is obtained after the blue light passes through the self-luminous layer.
Further, in the red self-luminous region, the halogen I in the perovskite ink is mixed with the Br element according to a specific proportion; in the green self-luminous region, the halogen in the perovskite ink is Br element; in the blue self-luminous region, the halogen element Cl and Br element in the perovskite ink are mixed according to a specific proportion.
The invention has the beneficial effects that: the invention provides perovskite ink, a preparation method thereof and a backlight module. The backlight module structure utilizes the advantages of high luminous chromaticity purity, easy color adjustment and good light source uniformity of the self-luminous layer of the perovskite mesh points, and can obviously improve the color gamut range and the color expressive force of the display equipment. Meanwhile, the perovskite has high luminous efficiency and can effectively reduce energy consumption.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
The invention is further described below with reference to the figures and examples.
FIG. 1 is a schematic structural diagram of a backlight module and a display device according to the present invention;
FIG. 2 is a schematic structural diagram of a red, green and blue fluorescent perovskite light guide plate according to the present invention;
FIG. 3 is a schematic structural diagram of a red-green dual-color fluorescent perovskite light guide plate of the present invention;
the figures in the above drawings are numbered:
backlight module 10
A display device 100; a display panel 108; a light guide plate 101;
a self-light-emitting layer 102; a backlight 103; a back frame 104;
a first diffusion sheet 105; a prism sheet 106; and a second diffusion sheet 107.
Detailed Description
The following description of the embodiments refers to the accompanying drawings for illustrating the specific embodiments in which the invention may be practiced. Directional phrases used herein, such as, for example, upper, lower, front, rear, left, right, inner, outer, lateral, etc., refer only to the orientation of the accompanying drawings. The names of the elements, such as the first, the second, etc., mentioned in the present invention are only used for distinguishing different elements and can be better expressed. In the drawings, elements having similar structures are denoted by the same reference numerals.
Embodiments of the present invention will be described in detail herein with reference to the accompanying drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided to explain the practical application of the invention and to enable others skilled in the art to understand the invention for various embodiments and with various modifications as are suited to the particular use contemplated.
The invention provides perovskite ink, which comprises a perovskite precursor and a solvent;
the structural molecular formula of the perovskite precursor is (LX)2(SX)n-1(MX2)n(ii) a Wherein L is a long-chain organic cation and S is a short-chain organic cation; m is a metal cation; x is halogen.
The structural molecular formulas of the perovskite precursor are LX, SX and MX2The molecular mass ratio is 2: n-1: n, wherein 2<n<7。
The metal cation is a fourth main group metal Pb2+、Ge2+、Sn2+And/or a transition metal Cu2+、Ni2+、Co2+、Fe2+、Mn2+、Cr2+、Pd2+、Cd2+、Eu2+、Yb2+Any one of the above; the short-chain organic cation is organic amine group methylamine, formamidine and K+、Rb+And Cs+Any one or a combination of more of; the halogen comprises at least one of Br, Cl and I; the long-chain organic cation is selected from any one or more of the following organic groups:
the perovskite precursors LX, SX and MX2The mass ratio of the raw materials is 2: n-1: n; therein, 2<n<7, n is most preferably 5, but may also be 3, 4 or 6.
When the perovskite ink is blue, X is Cl element or the combination of Cl element and Br element, and the light-emitting wavelength of the perovskite precursor is about 380 nm.
When the perovskite ink is green, X is Br element, a combination of Cl element and Br element or a combination of I element and Br element, and the luminescence wavelength of the perovskite precursor is about 530 nm.
When the perovskite ink is red, X is halogen element I or the combination of the element I and the element Br, and the light-emitting wavelength of the perovskite precursor is about 760 nm.
In addition, when X is a mixture of Cl and Br, the light-emitting wavelength is between 380nm and 530nm, wherein the more Br is used, the closer the light-emitting wavelength is to 530nm, and the perovskite ink is green.
When X is Br and I, the luminescence wavelength is between 530nm and 760nm, wherein the more I is used, the closer the luminescence wavelength is to 760nm, and the perovskite ink is red.
The solvent is Dimethylformamide (DMF) or dimethyl sulfoxide (DMSO) and the like, the concentration of the solvent is 10 mg/ml-1000 mg/ml, and the concentration of the solvent in the invention is 100mg/ml, and can also be 20mg/ml, 50mg/ml, 200mg/ml, 500mg/ml or 800 mg/ml.
The invention also provides a preparation method of the perovskite ink, which comprises the following steps:
s1, will contain LX, SX and MX respectively2The raw materials are mixed to form a perovskite precursor, and the structural molecular formula of the perovskite precursor is (LX)2(SX)n-1(MX2)n(ii) a Wherein L is a long-chain organic cation, S is a short-chain organic cation, M is a metal cation, and X is halogen.
The structural molecular formulas of the perovskite precursor are LX, SX and MX2The molecular mass ratio is 2: n-1: n, wherein 2<n<7。
The gold isWith cations of metals of the fourth main group Pb2+、Ge2+、Sn2+And/or a transition metal Cu2+、Ni2+、Co2+、Fe2+、Mn2+、Cr2+、Pd2+、Cd2+、Eu2+、Yb2+Any one of the above; the short-chain organic cation is organic amine group methylamine, formamidine and K+、Rb+And Cs+Any one or a combination of more of; the halogen comprises at least one of Br, Cl and I; the long-chain organic cation is selected from any one or more of the following organic groups:
when the prepared perovskite ink is blue, X is Cl element or the combination of Cl element and Br element, and the light-emitting wavelength of the perovskite precursor is about 380 nm.
When the prepared perovskite ink is green, X is Br element, a combination of Cl element and Br element or a combination of I element and Br element, and the luminescence wavelength of the perovskite precursor is about 530 nm.
When the prepared perovskite ink is red, X is an element I or a combination of the element I and an element Br, and the luminescence wavelength of the perovskite precursor is about 760 nm.
In addition, when X is a mixture of Cl and Br, the luminescence wavelength is between 380nm and 530nm, wherein the more Br is, the closer the luminescence wavelength is to 530nm, and the perovskite ink prepared is green.
When X is Br and I, the luminous wavelength is between 530nm and 760nm, wherein the more I is used, the closer the luminous wavelength is to 760nm, and the red color of the perovskite ink is obtained.
S2, adding the prepared perovskite precursor into a solvent to obtain a mixed solution; the solvent is Dimethylformamide (DMF) or dimethyl sulfoxide (DMSO) and the like, the concentration of the solvent is 10 mg/ml-1000 mg/ml, and the concentration of the solvent in the invention is 100mg/ml, and can also be 20mg/ml, 50mg/ml, 200mg/ml, 500mg/ml or 800 mg/ml.
And S3, heating and stirring until the mixed raw materials are completely dissolved. The heating temperature is 60-80 ℃, the optimal temperature is 70 ℃, and the temperature can be 65 ℃ or 75 ℃. The stirring time is 1-2 h.
S4, cooling to room temperature, and finally obtaining the perovskite ink.
As shown in fig. 1, in order to apply the perovskite ink to an LCD, the present invention also provides a backlight module 10, including: the backlight module comprises a light guide plate 101, a backlight source 103, a back frame 104 and a functional film layer.
The backlight source 103 is arranged on the side surface of the back frame 104, and the backlight source 103 is a side-in type backlight source.
The light guide plate 101 is arranged in the back frame 104, and a self-luminous layer 102 is formed on the surface of the light guide plate 101; wherein the self-emissive layer 102 material is made from the perovskite ink.
The perovskite ink comprises a perovskite precursor and a solvent; the structural molecular formula of the perovskite precursor is (LX)2(SX)n-1(MX2)n(ii) a Wherein L is a long-chain organic cation and S is a short-chain organic cation; m is a metal cation; x is halogen. The structural molecular formulas of the perovskite precursor are LX, SX and MX2The molecular mass ratio is 2: n-1: n, wherein 2<n<7。
The self-light emitting layer has a plurality of self-light emitting regions 110 therein, and the self-light emitting regions 110 are arranged in a lattice. The self-light emitting layer has a red self-light emitting region 1011, a blue self-light emitting region 1012, and a green self-light emitting region 1013.
In the red self-luminous region 1011, the halogen I in the perovskite ink is mixed with the Br element in a specific ratio; in the green self-luminous region 1012, the halogen in the perovskite ink is a Br element; in the blue self-luminous region 1013, the halogen element Cl and the Br element in the perovskite ink are mixed in a specific ratio.
The present invention mainly utilizes an ink-jet printing method to prepare a light-emitting region 110 structure. The main process is as follows: firstly, absorbing perovskite ink into a printing nozzle, then moving the nozzle to a specific position, depositing a certain amount of ink into a specific area on an acrylic or polycarbonate plate in an oscillating mode, and obtaining a perovskite lattice structure along with the volatilization of a solvent. After the nozzle is cleaned, ink of other luminescent colors is absorbed to prepare a corresponding color lattice, and finally the required light guide plate 101 with the lattice point structure is obtained.
The perovskite light guide plate 101 in the backlight module 10 is different from the conventional light guide plate for passively reflecting light in that it is a self-luminous device, can actively emit light under the excitation of the backlight source 103, and has an isotropic light emission angle, so that the uniformity of the backlight source can be greatly improved, and the display quality is further improved.
As shown in fig. 2, if the backlight 103 emits violet light, the self-luminescent layer 110 has a red luminescent region 1011, a blue luminescent region 1012, and a green luminescent region 1013, and white light is obtained by mixing with the violet backlight 103. On the light guide plate 101, the red light emitting areas 1011, the green light emitting areas 1012 and the blue light emitting areas 1013 are arranged in a dot matrix at intervals in sequence.
As shown in fig. 3, if the backlight 103 emits blue light, the self-luminescent layer 110 has a red luminescent region 1011 and a green luminescent region 1013, and white light is obtained by mixing with the blue backlight. On the light guide plate 101, the red light emitting areas 1011 and the green light emitting areas 1013 are sequentially arranged in a dot matrix at intervals.
The functional film layer includes a first diffusion sheet 105, a prism sheet 106, and a second diffusion sheet 107.
The prism sheets 106 are disposed between the first diffusion sheet 105 and the second diffusion sheet 107, and are disposed on the back frame 104, respectively, and the lens assembly further diffuses light, so as to further improve uniformity of backlight source and display quality.
Finally, the present invention further provides a display device 100, which includes the backlight module 10 and a display panel 108 disposed on the backlight module, wherein the backlight module 10 has a perovskite lattice light guide plate 101, and the perovskite lattice light guide plate 101 is different from a conventional passive light reflection light guide plate in that it has a self-light emitting layer 102 made of perovskite ink, and can actively emit white light under the excitation of a backlight source 103, and the light emitting angle is isotropic, so that the uniformity of the backlight source can be greatly improved, and the display quality can be further improved.
It should be noted that many variations and modifications of the embodiments of the present invention fully described are possible and are not to be considered as limited to the specific examples of the above embodiments. The above examples are intended to be illustrative of the invention and are not intended to be limiting. In conclusion, the scope of the present invention should include those changes or substitutions and modifications which are obvious to those of ordinary skill in the art.
Claims (10)
1. A perovskite ink is characterized by comprising
A perovskite precursor and a solvent;
the structural molecular formula of the perovskite precursor is (LX)2(SX)n-1(MX2)n；
Wherein L is a long-chain organic cation and S is a short-chain organic cation;
m is a metal cation; x is halogen;
the structural molecular formulas of the perovskite precursor are LX, SX and MX2The molecular mass ratio of (a) to (b) is 2: n-1: n, wherein 2<n<7。
2. The perovskite ink of claim 1, wherein the metal cation is a group IV metal Pb2 +、Ge2+、Sn2+Any of the above, and/or,
transition metal Cu2+、Ni2+、Co2+、Fe2+、Mn2+、Cr2+、Pd2+、Cd2+、Eu2+、Yb2+Any one of the above;
the short-chain organic cation is organic amine group methylamine, formamidine and K+、Rb+And Cs+Any one or a combination of more of;
the halogen comprises at least one of Br, Cl and I;
the long-chain organic cation is selected from any one or more of the following organic groups:
3. the perovskite ink as claimed in claim 1, wherein the luminescent color of the ink can be adjusted by adjusting the ratio of the three halogens, thereby achieving a coverage of luminescence in the full visible spectrum.
When the perovskite ink is blue, the halogen is Cl element or the combination of the Cl element and Br element;
when the perovskite ink is green, the halogen is Br element, the combination of Cl element and Br element or the combination of I element and Br element;
when the perovskite ink is red, the halogen is an I element or a combination of the I element and a Br element.
4. The preparation method of the perovskite ink is characterized by comprising
Mixing raw materials LX, SX and MX2Mixing to form a perovskite precursor, wherein the structural formula of the perovskite precursor is (LX)2(SX)n-1(MX2)n(ii) a Wherein L is a long-chain organic cation, S is a short-chain organic cation, M is a metal cation, and X is halogen;
adding the prepared perovskite precursor into a solvent to obtain a mixed solution;
heating the mixed solution to 60-80 ℃, and stirring for 1-2 hours until the perovskite precursor is completely dissolved;
and reducing the temperature to room temperature to obtain the perovskite ink.
5. A backlight module, comprising:
a backlight source;
the light guide plate is provided with a self-luminous layer on the surface, and the material of the self-luminous layer is the perovskite ink;
a functional film layer facing the self-luminescent layer.
6. The backlight module according to claim 5,
the perovskite ink comprises a perovskite precursor and a solvent;
the structural molecular formula of the perovskite precursor is (LX)2(SX)n-1(MX2)n；
Wherein L is a long-chain organic cation and S is a short-chain organic cation;
m is a metal cation; x is halogen;
the structural molecular formulas of the perovskite precursor are LX, SX and MX2The molecular mass ratio is 2: n-1: n, wherein 2<n<7。
7. The backlight module as claimed in claim 5, wherein the self-luminous layer has a plurality of self-luminous regions arranged in a lattice.
8. The backlight module as claimed in claim 7, wherein the self-luminous layer has a red self-luminous region, a blue self-luminous region and a green self-luminous region, the light emitted from the backlight source is purple light, and white light is obtained after the purple light passes through the self-luminous layer.
9. The backlight module as claimed in claim 7, wherein the self-luminous layer has a red self-luminous region and a green self-luminous region, the light emitted from the backlight source is blue light, and the blue light passes through the self-luminous layer to obtain white light.
10. The backlight module according to claim 8,
in the red self-luminous region, halogen I and Br elements in the perovskite ink are mixed according to a specific ratio;
in the green self-luminous region, the halogen in the perovskite ink is Br element;
in the blue self-luminous region, the halogen element Cl and Br element in the perovskite ink are mixed according to a specific proportion.
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