CN113122053A - Quantum dot ink and preparation method of quantum dot film - Google Patents

Quantum dot ink and preparation method of quantum dot film Download PDF

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CN113122053A
CN113122053A CN201911402959.7A CN201911402959A CN113122053A CN 113122053 A CN113122053 A CN 113122053A CN 201911402959 A CN201911402959 A CN 201911402959A CN 113122053 A CN113122053 A CN 113122053A
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quantum dot
pyridinol
ink
dot ink
pyrrolidinediol
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李雪
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TCL Corp
TCL Research America Inc
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    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D11/00Inks
    • C09D11/30Inkjet printing inks
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    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D11/00Inks
    • C09D11/30Inkjet printing inks
    • C09D11/36Inkjet printing inks based on non-aqueous solvents
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00Organic light-emitting devices
    • H10K50/10OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/11OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
    • H10K50/115OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers comprising active inorganic nanostructures, e.g. luminescent quantum dots

Abstract

The invention belongs to the technical field of quantum dots, and particularly relates to quantum dot ink which comprises at least one quantum dot material and at least one pyridinol organic solvent, wherein the structural general formula of the pyridinol organic solvent is shown as a formula I:
Figure DDA0002347920610000011
formula I; wherein a and b are respectively and independently integers of 0-2, and a and b are not 0 at the same time; r1,R2Each independently selected from: at least one of substituted or unsubstituted alkyl, substituted or unsubstituted cycloalkyl. The quantum dot material in the quantum dot ink has good dispersion uniformity, good storage stability, proper viscosity, surface tension and boiling point, can meet the requirements of ink-jet printing and other processes, and has good film-forming uniformity and noThe solvent is remained, and a quantum dot material luminescent layer with a pixel lattice can be formed by deposition, so that the charge transmission efficiency in a quantum dot functional layer is effectively ensured, the luminescent efficiency is improved, and the integral photoelectric property of a quantum dot light-emitting diode prepared by using the quantum dot ink is improved.

Description

Quantum dot ink and preparation method of quantum dot film
Technical Field
The invention belongs to the technical field of quantum dots, and particularly relates to a preparation method of quantum dot ink and a quantum dot film.
Background
The quantum dots have the advantages of adjustable luminescence wavelength, narrow peak width, high luminescence efficiency, long service life, high thermal stability, excellent solution processability and the like due to the obvious quantum dot confinement effect, and have wide application prospects in the fields of novel display and illumination, solar cells, biomarkers and the like. The quantum dot light emitting diode (QLED) prepared by taking inorganic quantum dots with more stable performance as a light emitting layer has the advantages of wide color gamut range, full color, high color purity, low preparation cost and the like, and becomes a next-generation novel display with great potential.
The quantum dots can be dispersed in different solvents by adjusting the ligands. Therefore, the quantum dots have the characteristic of solution processing, namely, the quantum dots can be deposited on different materials through a simple solution processing mode. At present, when a quantum dot light-emitting device is manufactured, a quantum dot light-emitting layer can be prepared by a solution of quantum dots through various modes such as spin coating, blade coating, spraying, ink-jet printing and the like. Compared with spin coating, blade coating and spraying, the technology for preparing the quantum dot light-emitting layer by ink-jet printing can accurately deposit the quantum dot light-emitting material at a proper position according to the required amount, so that the semiconductor material is uniformly deposited to form a thin film layer. The ink-jet printing technology has high utilization rate of materials, and manufacturers can reduce production cost, simplify manufacturing process, easily popularize mass production and reduce cost. The ink jet printing technology is an effective method which is recognized at present and can solve the manufacturing problem of the large-size QLED screen.
However, the current methods for preparing quantum dot ink and quantum dot thin film still need to be improved.
Disclosure of Invention
The inventors found that quantum dot ink basically disperses quantum dots directly in a solvent, but if toluene, chloroform and other solvents with good dispersion stability are used as the quantum dot ink, the obtained quantum dot ink has very low viscosity and low boiling point; if some high molecular polymers with high viscosity are adopted in the quantum dot ink, the dispersion effect on the quantum dots is poor, and the introduction of the polymer additive with insulating property can reduce the charge transmission capability of the film. Meanwhile, the quantum dot ligand can perform dissociation balance to a certain degree under the complex solvent environment, and when the storage time is fixed, the dissociation balance is possibly damaged due to the change of the external environment, so that the storage stability is damaged. Therefore, a solvent which can improve the viscosity, has better dispersibility and storage stability and can be conveniently removed in the post-treatment process is found. Therefore, the quantum dot ink can meet the requirements of ink-jet printing, can stably discharge ink, can be stably spread, can be dried uniformly, and is particularly important for forming a film uniformly.
The present invention aims to alleviate or solve at least to some extent at least one of the above mentioned problems.
The invention aims to provide quantum dot ink, and aims to solve at least one technical problem that the existing quantum dot ink cannot simultaneously meet the requirements of good dispersibility and storage stability of quantum dots, and has viscosity and volatilization film forming characteristics suitable for application.
The invention also aims to provide a preparation method of the quantum dot film.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
the quantum dot ink comprises at least one quantum dot material and at least one pyridine alcohol organic solvent, wherein the pyridine alcohol organic solvent has a structural general formula shown as the following formula I:
Figure BDA0002347920590000021
wherein a and b are respectively and independently integers of 0-2, and a and b are not 0 at the same time;
R1,R2each independently selected from: at least one of substituted or unsubstituted alkyl, substituted or unsubstituted cycloalkyl.
Correspondingly, the invention also provides a preparation method of the quantum dot film, which comprises the following steps:
providing a substrate;
and depositing the quantum dot ink on the substrate, and then drying to obtain the quantum dot film.
The quantum dot ink provided by the invention comprises at least one quantum dot material and at least one pyridine alcohol organic solvent, wherein the structural general formula of the pyridine alcohol organic solvent is shown as a formula I, on one hand, the pyridine alcohol organic solvent in the quantum dot ink contains hydroxyl and a cyclic alkane structure, so that the viscosity of the quantum dot ink is close to the optimal viscosity required by deposition processes such as ink-jet printing and the like, and the viscosity of the quantum dot ink can be flexibly adjusted along with the change of the number of hydroxyl functional groups, so that the quantum dot ink is suitable for various specific application processes and scenes; on the other hand, the pyridine alcohol organic solvent of the quantum dot ink contains pyridine alcohol containing N heterocyclic rings, and can generate coordination with the surface of the quantum dot, so that the quantum dot is stably dispersed in the ink solvent, the space between the quantum dots can be effectively adjusted, the energy transfer between the quantum dots is controlled, the film forming property of the quantum dot ink is improved, and the charge transmission efficiency of a quantum dot light-emitting layer after film forming is improved; on the other hand, the pyridine alcohol organic solvent in the quantum dot ink can be completely volatilized under the conditions of certain vacuum degree and proper high and low temperature, so that the quantum dot light-emitting layer with the pixel lattice is formed by the quantum dot deposition, and the charge transmission efficiency and the photoelectric property of the quantum dot functional layer are further ensured.
The preparation method of the quantum dot film provided by the invention is characterized in that the quantum dot ink is deposited on the substrate and then dried to obtain the quantum dot film. Because the quantum dot ink has the characteristics of good dispersion stability of the quantum dot material, proper viscosity, surface tension, boiling point and the like, the quantum dot ink forms a quantum dot film with a pixel lattice after being deposited, and the quantum dot film can be used as a quantum dot light-emitting layer of a quantum dot light-emitting diode. The quantum dot film has good film uniformity and no solvent residue, effectively ensures the charge transmission efficiency in the quantum dot functional layer, and improves the luminous efficiency, thereby improving the integral photoelectric property of the quantum dot light-emitting diode prepared by using the quantum dot ink.
Drawings
Fig. 1 is a quantum dot light emitting diode with a positive configuration according to an embodiment of the present invention.
Fig. 2 is an inverse quantum dot light emitting diode according to an embodiment of the present invention.
Fig. 3 is a schematic flow chart of a method for manufacturing a quantum thin film according to an embodiment of the present invention.
Detailed Description
In order to make the purpose, technical solution and technical effect of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention is clearly and completely described, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive step in connection with the embodiments of the present invention shall fall within the scope of protection of the present invention.
The weight of the related components mentioned in the description of the embodiments of the present invention may not only refer to the specific content of each component, but also represent the proportional relationship of the weight among the components, and therefore, the content of the related components is scaled up or down within the scope disclosed in the description of the embodiments of the present invention as long as it is in accordance with the description of the embodiments of the present invention. Specifically, the weight described in the description of the embodiment of the present invention may be a unit of mass known in the chemical industry field, such as μ g, mg, g, and kg.
The embodiment of the invention provides quantum dot ink, which comprises at least one quantum dot material and at least one pyridine alcohol organic solvent, wherein the general structural formula of the pyridine alcohol organic solvent is shown as the following formula I:
Figure BDA0002347920590000041
wherein a and b are respectively and independently integers of 0-2, and a and b are not 0 at the same time;
R1,R2each independently selected from: at least one of substituted or unsubstituted alkyl, substituted or unsubstituted cycloalkyl.
The quantum dot ink provided by the embodiment of the invention comprises at least one quantum dot material and at least one pyridine alcohol organic solvent, wherein the structural general formula of the pyridine alcohol organic solvent is shown as a formula I, on one hand, the pyridine alcohol organic solvent in the quantum dot ink contains hydroxyl and a cyclic alkane structure, so that the viscosity of the quantum dot ink is close to the optimal viscosity required by deposition processes such as ink-jet printing and the like, and the viscosity of the quantum dot ink can be flexibly adjusted along with the change of the number of hydroxyl functional groups, so that the quantum dot ink is suitable for various specific application processes and scenes; on the other hand, the pyridine alcohol organic solvent of the quantum dot ink contains pyridine alcohol containing N heterocyclic rings, and can generate coordination with the surface of the quantum dot, so that the quantum dot is stably dispersed in the ink solvent, the space between the quantum dots can be effectively adjusted, the energy transfer between the quantum dots is controlled, the film forming property of the quantum dot ink is improved, and the charge transmission efficiency of a quantum dot light-emitting layer after film forming is improved; on the other hand, the pyridine alcohol organic solvent in the quantum dot ink can be completely volatilized under the conditions of certain vacuum degree and proper high and low temperature, so that the quantum dot light-emitting layer with the pixel lattice is formed by the quantum dot deposition, and the charge transmission efficiency and the photoelectric property of the quantum dot functional layer are further ensured.
Specifically, the structural general formula of the pyridine alcohol organic solvent in the quantum dot ink contains R1And R2The substituent(s) may be mono-or polysubstituted at any carbon position on the furan ring, such as:
Figure BDA0002347920590000051
the dosage forms comprise a1, b1, a2, b2, a3 and b3 which are respectively and independently integers of 0-2, and a1, b1, a2, b2, a3 and b3 are not 0 at the same time; r11,R21、R12,R22、R13,R23Each independently selected from: at least one of substituted or unsubstituted alkyl, substituted or unsubstituted cycloalkyl.
In some embodiments, R1,R2Each independently selected from unsubstituted alkyl or unsubstituted cycloalkyl, wherein the unsubstituted alkyl may be a branched or straight chain saturated aliphatic hydrocarbon group, such as an alkyl group having 2 to 25 carbon atoms, and the unsubstituted cycloalkyl may be at least one of cycloalkyl groups having 3 to 25 carbon atoms. In some embodiments, the C2-25 alkyl group includes, but is not limited to: butyl, pentyl, hexyl, heptyl, octyl, nonyl, decylAt least one of undecyl, dodecyl, hexadecyl, octadecyl and isomers thereof. In some embodiments, the cycloalkyl group having 3 to 25 carbon atoms includes, but is not limited to: at least one of cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclononyl, cyclodecyl, cycloundecyl, and isomers thereof. In the pyridine alcohol organic solvent of the embodiment of the invention, R1,R2The organic solvent is respectively and independently selected from alkyl with 2-25 carbon atoms or cycloalkyl with 3-25 carbon atoms, and the pyridine alcohol organic solvent can regulate the dispersibility of the quantum dots in the ink and can regulate the physical and chemical properties of the quantum dot ink such as viscosity, surface tension and boiling point by regulating the length of alkyl substituent groups, the type of branched chains and the like, so that the organic solvent is suitable for various preparation processes of quantum dot functional layers, is particularly suitable for ink-jet printing processes, and has good film-forming performance.
In further embodiments, R1,R2Each independently selected from substituted alkyl or substituted cycloalkyl, the substituted alkyl includes but is not limited to substituted alkyl with 2-25 carbon atoms, and the substituted cycloalkyl includes but is not limited to substituted cycloalkyl with 3-25 carbon atoms. Wherein the substituents of the substituted alkyl group are selected from: aryl, heteroaryl, nitro, cyano, amino, halogen, hydroxy, carboxy, ester, carbonyl, alkenyl, alkynyl, cycloalkyl, alkoxy, aryloxy, heteroaryloxy, alkoxycarbonyl, perfluoroalkyl, perfluoroalkoxy, aryloxy, thioalkoxy, -N (R)3)(R4)、-S(O)2-N(R3)(R4)、-C(=O)-N(R3)(R4)、(R3)(R4) N-alkyl, (R)3)(R4) N-alkoxy, (R)3)(R4) N-alkylaryloxyalkyl, -S (O)x-aryl, -S (O)x-at least one of heteroaryl, silyl groups; wherein x is a positive integer of 0-2, R3、R4Each independently selected from: one of alkyl, cycloalkyl and aryl. In the pyridine alcohol organic solvent containing substituted alkyl in the quantum dot ink provided by the embodiment of the invention, on the one hand, the alkyl of the long-chain branch can be betterRegulating and controlling the viscosity, surface tension and other characteristics of the solvent; on the other hand, the substituent of the cyclic structure such as cycloalkyl, aryl, heteroaryl and the like in the substituted alkyl can increase the molecular space torsion, and further better regulates and controls the characteristics of the solvent molecules such as viscosity, surface tension and the like; on the other hand, by substituting active substituents such as hydroxyl, ester group, carboxyl, nitro, amino and the like in the alkyl, the coordination effect of solvent molecules and the surface ligand of the quantum dot material can be enhanced, the quantum dot material has better dispersibility, and the stability of the quantum dot ink is improved through the coordination effect of the solvent and the quantum dot ligand.
In some embodiments, among the above substituents for substituted alkyl, when R is3、R4When the alkyl groups are respectively and independently selected from alkyl groups, the alkyl groups are selected from alkyl groups with 1-25 carbon atoms, namely R3、R4The alkyl group may be independently selected from branched or straight-chain saturated aliphatic hydrocarbon alkyl groups having 1 to 25 carbon atoms, including but not limited to at least one alkyl group selected from methyl, ethyl, propyl, isopropyl, isobutyl, sec-butyl, tert-butyl, pentyl, isopentyl, neopentyl, cyclopentyl, hexyl, cyclohexyl, and isohexyl groups. In other embodiments, R in the above-described substituents of substituted alkyl groups3、R4May each be independently selected from aryl groups including, but not limited to: at least one of phenyl, biphenyl, triphenyl, benzo group, naphthyl, anthryl, peribenzo naphthyl, phenanthryl, fluorenyl, pyrenyl, chrysenyl, perylene group and azulenyl. In still other embodiments, R in the above-mentioned substituents of said substituted alkyl groups3、R4May each be independently selected from heteroaryl groups selected from: dibenzothienyl, dibenzofuryl, furyl, thienyl, benzofuryl, benzothienyl, carbazolyl, pyrazolyl, imidazolyl, triazolyl, isoxazolyl, thiazolyl, oxadiazolyl, oxatriazolyl, dioxazolyl, thiadiazolyl, pyridyl, pyridazinyl, pyrimidinyl, pyrazinyl, triazinyl, oxazinyl, thiazinyl, oxadiazinyl, indolyl, benzimidazolyl, indazolyl, indolizinyl, benzoxazolyl, isoxazolyl, benzothiazolyl, quinolyl, isoquinolyl, o-triazinyl, thiadiazolyl, pyridazinyl, pyrimidinyl, pyrazinyl, triazinyl, pyrazinyl, thiadiazinyl, oxadiazinyl, indolyl, benzimidazolyl, indazolyl, indolizinyl, benzoxazolyl, isoxazolyl, benzothiazolylDiazo (hetero) naphthyl, quinazolinyl, quinoxalinyl, naphthyl, phthalyl, pteridinyl, xanthenyl, acridinyl, phenazinyl, phenothiazinyl, phenoxazinyl, dibenzoselenophenyl, benzoselenophenyl, benzofuropyridazolyl, indolocarbazolyl, pyridylindolyl, pyrroldipicolindolyl, furanbipyridyl, benzothiophene furopyridyl, thienobipyridyl, benzoselenophenopyridyl and selenophenedipyridyl. R of pyridinol organic solvent in quantum dot ink of embodiment of the invention1,R2Each independently selected from substituted alkyl, wherein the substituent of the substituted alkyl is selected from any one of the above embodiments, and R containing alkyl, aryl, heteroaryl, ester group, cycloalkyl and other groups1,R2The substituted alkyl is connected to the pyridine ring, so that the physicochemical properties such as viscosity, surface tension, boiling point and the like of an organic solvent in the ink can be better adjusted, wherein the substituted alkyl containing an aryl group, a heteroaryl group, a cycloalkyl group and other cyclic structures can increase molecular space torsion, and the substituted alkyl has a better improvement and adjustment effect on the viscosity, the surface tension and the like of the organic solvent.
In some embodiments, the pyridinol-based organic solvent in the quantum dot ink includes, but is not limited to: (3S) -1- (2-aminoethyl) -3-pyridinol, (3R) -1- (2-aminoethyl) -3-pyridinol, (R) -3-pyridinol, (S) -3-pyridinol, 1- (5-bromo-2-pyrimidine) -3-pyridinol, (3R,4S) -4- [ (methylthio) methyl ] -3-pyridinol, (3S) -1- (2-aminoethyl) -3-pyridinol, (3R) -1- (2-aminoethyl) -3-pyridinol, (R) -3-pyridinol, (S) -3-pyridinol, (3R,4S) -4- [ (methylthio) methyl ] -3-pyridinol, (3R,5S) -5- (aminomethyl) -1-methyl-3-pyridinol, 1- (4-piperidinyl) -3-pyridinol, (S) - (+) -1-Cbz-3-pyridinol, 3- (4-ethoxyphenyl) -3-pyridinol, 2-methyl-1-nitroso-2-pyridinol, 1- (4-amino-2-ethylphenyl) -3-pyridinol, 1- (diaminomethyl) -2-pyridinol, (3R,5S) -5-hydroxymethyl-3-pyridinol, 1-benzyl-3- (trifluoromethyl) -3-pyridinol, and their use as anti-inflammatory agents, 4-amino-3-pyridinol, 5-methyl-3-pyridinol, 3- (hydroxymethyl) -2,2,5, 5-tetramethyl-1-pyridinol, (3S) -3- (methoxymethoxy) -1-pyridinol, 1- (4-bromophenyl) -3-pyridinol, 1-methyl-3-pyridinol, 1- (2-chloro-3-hydroxyphenyl) -2-pyridinol, 4- [ (2-hydroxyethyl) amino ] -3-pyridinol, (3R) -1- (2-methoxyethyl) -3-pyridinol, 1-cyclopentyl-3-pyridinol, 1-amino-3-pyridinol, (S) -1-benzyl-3-pyridinol, 1-isopropyl-3-pyridinol, (1S,2R) -1-phenyl-2- (1-pyrrolidinyl) -1-propanol, 1- (3-hydroxypropyl) pyrrolidine, (3S,4S) -1-benzylpyrrolidine-3, 4-diol, (3R,4R) - (-) -1-benzyl-3, 4-pyrrolidinediol, trans-4- (1-pyrrolidinyl) tetrahydro-3-furanol, 4- (1-pyrrolidine) -1-butanol, (1R,2S) -1-phenyl-2- (1-pyrrolidinyl) -1-propanol, and mixtures thereof, (3S,4S) -pyrrolidine-3, 4-diol, (2R,3R,4S) -2- (2-hydroxyethyl) -3, 4-pyrrolidinediol, 3-allyl-1-benzylpyrrolidin-3-ol, 2-phenyl-3-pyrrolidin-1-yl-propan-1-ol, (S) -2- (1-benzylpyrrolidin-2-yl) propan-2-ol, 5- (1-pyrrolidinyl) -3-pentyn-1-ol, 2-methyl-2- (pyrrolidin-1-yl) propan-1-ol, 2-dimethyl-3-pyrrolidin-1-ylpropan-1-ol, and mixtures thereof, 2-methyl-3-pyrrolidin-1-propan-1-ol, 1- (5-aminopyridin-2-yl) pyrrolidin-3-ol, 2, 5-bis (hydroxymethyl) -3, 4-pyrrolidinediol, 1-phenylmethyl-3, 4-pyrrolidinediol, (3R,4R) - (-) -1-benzyl-3, 4-pyrrolidinediol, 2- (hydroxymethyl) -1-methyl-3, 4-pyrrolidinediol, 1- (2-aminoethyl) pyrrolidin-3-ol, 1- (5-aminopyridin-2-yl) pyrrolidin-3-ol, 1- (hydroxymethyl) -3-ol, 4-pyrrolidinediol, and mixtures thereof, (3R,4R) -3, 4-pyrrolidinediol, 2- (pyrrolidin-1-yl) ethanethiol, 3-pyrrolidin-2-propan-1-ol, 1-methyl-2 beta-benzyl-5 beta-nonylpyrrolidin-3 beta-ol, (3S,4R) -pyrrolidine-3, 4-diol, 1-benzyl-4-methyl-pyrrolidin-3-ol, 4- (pyrrolidin-1-yl) -2-butyn-1-ol, (R) -1- (pyridin-4-yl) pyrrolidin-3-ol, (S) -1- (pyridin-4-yl) pyrrolidin-3-ol, and mixtures thereof, 2,3' -bipyrrolidin-4-ol, (R) -1- (3-fluorophenyl) pyrrolidin-3-ol, 2- (pyrrolidin-3-yl) propan-2-ol, 1-benzyl-3, 4-pyrrolidinediol, (2R,3S,4R) -2- (2-aminoethyl) -3, 4-pyrrolidinediol, (2R,3S,4R) -2- (2-anilinoethyl) -3, 4-pyrrolidinediol, (2S,3R,4S) -2- {2- [ (2-hydroxybutyl) amino ] ethyl } -3, 4-pyrrolidinediol, (2S,3R,4S) -2- [2- (4-morpholinyl) ethyl ] -3, 4-pyrrolidinediol, (2R,3S,4R) -2- {2- [ (4-hydroxybutyl) amino ] ethyl } -3, 4-pyrrolidinediol, (2R,3R,4S) -2- (hydroxymethyl) pyrrolidine-3, 4-diol, (3S,4S) -1-octyl-3, 4-pyrrolidinediol, 1-methyl-3-pyridinol, 1-ethyl-3-pyridinol, 1-benzyl-3-pyridinol, (R) - (+) -1-benzyl-3-pyridinol, (R) - (-) -1-methyl-3-pyridinol, N-tert-butoxycarbonyl-L-prolinol, N-octylamino-3, 4-pyrrolidinediol, 1-methyl-3-pyridinol, 1-ethyl-3-pyrid, At least one of N- (tert-butyloxycarbonyl) -D-prolinol and N-benzyl-L-prolinol. In the quantum dot ink of the embodiment of the present invention, the specific pyridine alcohol organic solvent contains substituents such as a long-chain branch and a cyclic structure, so that the quantum dot ink has characteristics such as viscosity and surface tension suitable for a deposition process such as inkjet printing, and the specific pyridine alcohol organic solvent further contains active functional groups such as amino groups, methylthio groups, and hydroxyl groups, and the active functional groups can further enhance a coordination effect of the organic solvent and a quantum dot surface ligand, so that a dispersion effect of the organic solvent on the quantum dot material is enhanced, the quantum dot material can be better and uniformly and stably dispersed in an ink system, and stability of the ink is improved.
In some embodiments, the quantum material in the quantum dot ink may be any quantum dot material, such as: in some embodiments, the quantum dot materials include, but are not limited to: at least one of the semiconductor compounds of II-IV group, II-VI group, II-V group, III-VI group, IV-VI group, I-III-VI group, II-IV-VI group and II-IV-V group of the periodic table of the elements, or at least two of the semiconductor compounds. In some embodiments, the quantum dot material is selected from: at least one semiconductor nanocrystal compound of CdSe, CdS, CdTe, ZnO, ZnSe, ZnS, ZnTe, HgS, HgSe, HgTe and CdZnSe, or at least two semiconductor nanocrystal compounds with mixed type, gradient mixed type, core-shell structure type or combined type structures. In other specific embodiments, the quantum dot material is selected from: at least one semiconductor nanocrystal compound of InAs, InP, InN, GaN, InSb, InAsP, InGaAs, GaAs, GaP, GaSb, AlP, AlN, AlAs, AlSb, CdSeTe and ZnCdSe, or a semiconductor nanocrystal compound with a mixed type, a gradient mixed type, a core-shell structure type or a combined type of at least two components. In other embodiments, the quantum dot material is selected from: at least one of a perovskite nanoparticle material (in particular a luminescent perovskite nanoparticle material), a metal nanoparticle material, a metal oxide nanoparticle material. The quantum dot materials have the characteristics of quantum dots and have good photoelectric properties.
In some embodiments, the particle size of the quantum dot material in the quantum dot ink is 1-20 nm, and the dispersibility of the quantum dot material in an ink solvent and the stability of the whole dispersion system of the quantum dot ink can be better regulated and controlled by regulating and controlling the size of the quantum dot material.
In some embodiments, the quantum dot material in the quantum dot ink can be oil-soluble quantum dot material, and can also be self-doped or non-doped quantum dot material, and has better dispersibility and dispersion stability in the above-mentioned pyridine alcohol organic solvent.
In some embodiments, the surface of the quantum dot material in the quantum dot ink is further bound with one or more ligands of acid ligands, thiol ligands, amine ligands, (oxy) phosphine ligands, phospholipids, lecithin, polyvinylpyridine, and the like. In some embodiments, acid ligands include, but are not limited to: one or more of deca acid, undecenoic acid, tetradecanoic acid, oleic acid, and stearic acid; the thiol ligand comprises one or more of octaalkylthiol, dodecylthiol and octadecylthiol; the amine ligand comprises one or more of oleylamine, octadecylamine and octamine; the (oxy) phosphine ligand comprises one or more of trioctylphosphine and trioctylphosphine. According to the embodiment of the invention, the ligand bound on the surface of the quantum dot and the active functional group in the organic solvent can generate a coordination binding effect, so that the quantum dot material is better dispersed in the solvent of the quantum dot ink, and is uniform in dispersion and good in stability.
In some embodiments, the boiling point of the quantum dot ink is 80-380 ℃, the quantum dot ink with the boiling point characteristic can be completely volatilized and removed under the effects of heating, temperature reduction or vacuum pressure reduction and the like to form a quantum dot functional layer, the quantum dot functional layer has good film forming characteristics, the quantum dots are densely arranged, the charge transmission efficiency among quantum dot materials is improved, the threshold voltage is reduced, and the energy efficiency is improved.
In some embodiments, the quantum dot ink has a viscosity of 0.5cPs to 60cPs at 25 ℃ to 35 ℃. In some embodiments, the surface tension of the quantum dot ink in an environment of 25-35 ℃ is 20-60 mN/m. The quantum dot ink can realize flexible regulation of the viscosity, the surface tension and the boiling point of the quantum dot ink by regulating the type of the substituent group, so that the quantum dot ink has the boiling point, the viscosity and the surface tension which are suitable for processing and application, and under the room temperature environment of 25-35 ℃, the boiling point of the quantum dot ink is 80-380 ℃, the viscosity is 0.5-60 cPs, and the surface tension is 20-60 mN/m; on the other hand, the viscosity and surface tension of the quantum dot ink with the characteristics have good adaptability to deposition processes such as ink-jet printing, and when the quantum dot light-emitting layer is deposited by adopting the ink-jet printing process, the nozzle for ink-jet printing properly releases ink without blockage, and the stability of printed ink is good.
In some embodiments, the quantum dot ink has a boiling point of 80 ℃ to 380 ℃, a viscosity of 1cPs to 15cPs, and a surface tension of 20mN/m to 60 mN/m. In some embodiments, the quantum dot ink may have a boiling point of 80 ℃, 100 ℃, 200 ℃, 300 ℃ or 380 ℃, a viscosity of 0.5cPs, 1cPs, 5cPs, 10cPs, 15cPs, 20cPs, 30cPs, 40cPs, 50cPs or 60cPs, and a surface tension of 20mN/m, 25mN/m, 30mN/m, 40mN/m, 50mN/m or 60mN/m in an environment of 25 ℃.
In some embodiments, the quantum dot ink comprises the following components in percentage by mass, based on 100% of the total mass of the quantum dot ink:
0.01 to 45 percent of quantum dot material,
and 10-90% of a pyridine alcohol organic solvent.
The quantum dot ink provided by the embodiment of the invention comprises 0.01-45% of quantum dot material and 10-90% of pyridine alcohol organic solvent, and the pyridine alcohol organic solvent can effectively disperse the quantum dot material and ensure that the quantum dot material has better dispersion stability in a solvent system, and has viscosity and surface tension suitable for application processes such as ink-jet printing, and the like, and the pyridine alcohol organic solvent in the quantum dot ink can be completely volatilized and removed under the effects of heating, cooling, reduced pressure, vacuum and the like to form a quantum dot functional layer without solvent residue, so that the solvent in the quantum dot ink can also be the pyridine alcohol organic solvent. In some embodiments, the mass percentage of the quantum dot material in the quantum dot ink may be 0.1-40%, 0.1-30%, 0.1-20% or 0.2-10%, and the mass percentage of the pyridine alcohol organic solvent may be 10-70%, 10-60%, 10-45% or 10-30%, based on 100% of the total mass of the quantum dot ink.
In some embodiments, the quantum dot ink further comprises an auxiliary organic solvent and/or an auxiliary agent, and the quantum dot ink comprises the following mass percentage content based on 100% of the total mass of the quantum dot ink
Figure BDA0002347920590000111
The quantum dot ink of the embodiment of the invention can further comprise an auxiliary organic solvent and/or an auxiliary agent, and the viscosity, the dispersibility, the charge transfer efficiency and the like of the quantum dot ink can be further adjusted through the auxiliary organic solvent, the auxiliary agent or a mixture thereof. According to the quantum dot ink disclosed by the embodiment of the invention, through the mutual coordination and coordination of the components, the ink has better dispersion uniformity performance and storage stability on a quantum dot material, has proper viscosity, surface tension and boiling point, is deposited to form the quantum dot light-emitting layer with the pixel lattice, is good in film forming uniformity, has no solvent residue, can ensure that the charge transmission efficiency of the light-emitting layer of the quantum dot material is high, reduces the starting voltage, so that electrons and holes can perform composite radiation light-emitting, effectively ensures the charge transmission efficiency in a quantum dot functional layer, and improves the light-emitting efficiency.
In some embodiments, the quantum dot ink further comprises an auxiliary organic solvent and/or an auxiliary agent, and the quantum dot ink comprises the following mass percentage content based on 100% of the total mass of the quantum dot ink
Figure BDA0002347920590000121
In some embodiments, the mixing ratio of the pyridinol organic solvent to the auxiliary organic solvent is 1: (0.5-2.5), and the properties such as the boiling point, the viscosity and the like of the quantum dot ink can be adjusted in a wider range by adjusting the addition amount of the auxiliary organic solvent.
In some embodiments, the auxiliary organic solvent is selected from: chlorobenzene, o-dichlorobenzene, tetrahydrofuran, anisole, morpholine, toluene, o-xylene, m-xylene, p-xylene, n-hexane, dichloromethane, chloroform, 1, 4-dioxane, 1, 2-dichloroethane, 1,1, 1-trichloroethane, 1,1,2, 2-tetrachloroethane, tetrahydronaphthalene, decalin, phenoxytoluene, dodecane, 1-methoxynaphthalene, 1-butylnaphthalene, o-dimethoxybenzene, 1-methylnaphthalene, 1, 2-dimethylnaphthalene, cyclohexylbenzene, 1,2, 4-trimethoxybenzene, phenylhexane, tetradecane, 1, 2-dimethylnaphthalene, 4-isopropylbiphenyl, 2-isopropylnaphthalene, 1-ethylnaphthalene and 1,2,3, 4-tetrahydronaphthalene. The auxiliary organic solvent selected by the embodiment of the invention has good solvent characteristics, can further assist in dispersing the quantum dot material, and improves the physical and chemical properties of the quantum dot ink, such as viscosity, surface tension, boiling point and the like.
In some embodiments, the adjuvants include, but are not limited to: at least one of a charge transport agent, a viscosity modifier, and a dispersant. The quantum dot ink provided by the embodiment of the invention is added with the charge transport agent, the viscosity regulator, the dispersing agent and other auxiliaries, so that the properties of the quantum dot ink such as viscosity, dispersibility and the like can be further regulated and improved, and the charge transport property in the quantum dot functional layer can be improved.
In some embodiments, the charge transport agent is selected from: at least one or at least two of polycarbazole, polyfluorene, polyaniline, poly (p-phenylenevinylene), polyacetylene, poly (p-phenylene), polythiophene, polypyridine, polypyrrole and derivatives thereof.
In some embodiments, the viscosity modifier is selected from: at least one of polyhydric alcohols, alkyl glycol ethers, trimethylolpropane, trimethylolethane, casein, and carboxymethylcellulose. In some embodiments, the polyhydric alcohol is selected from: at least one of ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, hexylene glycol, 1, 3-butylene glycol, 1, 4-butylene glycol, 1, 5-pentanediol, 2-butene-1, 4-diol, 2-methyl-2-pentanediol, 1,2, 6-hexanetriol, glycerol, polyethylene glycol, dipropylene glycol, and polyvinyl alcohol. In other embodiments, the alkyl glycol ether is selected from: at least one of polyethylene glycol monobutyl ether, diethylene glycol monoethyl ether, dipropylene glycol monomethyl ether, and propylene glycol n-propyl ether.
In some embodiments, the dispersant is selected from: at least one of an anionic dispersant, a cationic dispersant, a nonionic dispersant and an amphoteric surfactant. In some embodiments, the nonionic surfactant is selected from: at least one of linear or secondary alcohol ethoxylates, alkylphenol ethoxylates, fluorosurfactants, fatty acid polyoxyethylene esters, fatty amine polyoxyethylene ethers, polyoxyethylene block copolymers and propoxylated block copolymers, polyoxyethylene and propylsilicone resin based surfactants, alkyl polyglycosides, and acetylene polyethylene oxide surfactants. In some embodiments, the anionic surfactant is selected from: carboxylate (e.g., ether carboxylate and sulfosuccinate), sulfate (e.g., sodium lauryl sulfate), sulfonate (e.g., dodecylbenzene sulfonate, alpha-olefin sulfonate, alkyl diphenyl oxide disulfonate, fatty acid taurate, alkyl naphthalene sulfonate), phosphate (e.g., phosphate esters of alkyl and aryl alcohols), phosphonate and amine oxide surfactants, and anionic fluorinated surfactants. In some embodiments, the cationic surfactant is selected from: at least one of quaternary ammonium compound, cationic amine oxide, ethoxylated fatty amine, imidazoline surfactant; in some embodiments, the amphoteric surfactant is selected from: at least one of trimethylamine ethyl lactone, sulphobetaine and aminopropionate.
The quantum dot ink in each embodiment enables the quantum dot material to be uniformly dispersed in the ink system through the mutual combined action of the quantum dot solvent, the organic solvent and the auxiliary agent, ensures the uniformity and stability of the quantum dot ink system, has good storage stability, enables the quantum dot ink to have the characteristics of proper viscosity, surface tension and the like, enables the quantum dot ink to be highly matched with processes such as ink-jet printing and the like, ensures the stability of ink discharge, and ensures the uniformity of a printed film. In addition, the electronic dot ink also has a better proper boiling point, is beneficial to the application of processes such as ink-jet printing and the like, can be completely volatilized and removed after being dried and formed into a film, has no residue, avoids the influence of solvent residue on charge transmission of the quantum dot functional layer, and ensures the luminous efficiency of the quantum dot functional layer.
Correspondingly, as shown in fig. 3, an embodiment of the present invention further provides a method for preparing a quantum dot thin film, including the following steps: providing a substrate; and depositing the quantum dot ink on the substrate, and then drying to obtain the quantum dot film.
The preparation method of the quantum dot film provided by the embodiment of the invention is prepared by depositing the quantum dot ink on the substrate and then drying. Because the quantum dot ink has the characteristics of good dispersion stability of the quantum dot material, proper viscosity, surface tension, boiling point and the like, the quantum dot ink forms a quantum dot film with a pixel lattice after being deposited, and the quantum dot film can be used as a quantum dot light-emitting layer of a quantum dot light-emitting diode. The quantum dot film has good film uniformity and no solvent residue, effectively ensures charge transmission efficiency in the quantum dot film, and improves the luminous efficiency, thereby improving the integral photoelectric property of the quantum dot light-emitting diode prepared by using the quantum dot ink.
In some embodiments, the quantum dot ink is deposited by inkjet printing to form a quantum dot film. The quantum dot film is prepared by adopting an ink-jet printing mode, the quantum dot ink is properly released from a nozzle of the ink-jet printing head, the printing stability is good, the uniformity is good, the film forming characteristic is good, the film thickness is uniform and adjustable, and the yield and the generation efficiency of the quantum dot light-emitting diode device prepared by using the quantum dot ink are improved. The ink-jet printing mode in the embodiment of the present invention is not particularly limited, and the quantum dot ink may be used for printing. In some embodiments, the ink jet printing can be by a conventional piezoelectric ink jet printing or thermal ink jet printing process.
In some embodiments, after the quantum dot ink is deposited, under the action of a certain vacuum degree and proper high and low temperature, the solvent in the quantum dot ink can be removed, so that other substances except the quantum dot material in the quantum dot ink are completely volatilized, and the quantum dot film is obtained. In some embodiments, the quantum dot material is heated at a heating temperature of 60 to 180 ℃ for about 30 minutes by a heating method such as pulse or continuous heating treatment, so that all substances except the quantum dot material are volatilized and removed. In some embodiments, the temperature of the temperature reduction treatment is 0-20 ℃, and the vacuum degree of the reduced pressure vacuum drying treatment is 1 × 10-6And (4) carrying out the treatment for enough time, such as not more than 30 minutes, by using the Torr to the normal pressure, so that all substances except the quantum dot material are volatilized and removed. The solvent removal mode adopted by the embodiment of the invention can ensure that the solvent in the quantum dot light-emitting layer is completely removed, and the light-emitting performance of the quantum dot material is not influenced.
In some embodiments, the quantum dot light emitting layer has a thickness of 10 to 100 nanometers. The thickness of the printed quantum dot film can be controlled by controlling the ink-jet printing, such as 10-100 nanometers, the thickness of the quantum dot film can be reasonably adjusted according to specific application requirements, and the method and the device are high in application flexibility and wide in application range. In some implementations, the quantum dot light emitting layer has a thickness of 20 to 50 nanometers.
Further, in some embodiments, the quantum dot thin film prepared using the above method may be used as a quantum dot light emitting layer in a quantum dot light emitting diode.
In some embodiments, the quantum dot light emitting diode of embodiments of the present invention includes a positive structure and an inversion structure.
In one embodiment, a positive structure quantum dot light emitting diode includes a stacked structure of an anode and a cathode disposed opposite each other, a quantum dot light emitting layer disposed between the anode and the cathode, and the anode is disposed on a substrate. Further, a hole function layer such as a hole injection layer, a hole transport layer, an electron blocking layer and the like can be arranged between the anode and the quantum dot light-emitting layer; an electron-transport layer, an electron-injection layer, a hole-blocking layer and other electron-functional layers can be arranged between the cathode and the quantum dot light-emitting layer. In some embodiments of positive-type devices, as shown in fig. 1, the quantum dot light emitting diode includes a substrate, an anode disposed on the surface of the substrate, a hole transport layer disposed on the surface of the anode, a quantum dot light emitting layer disposed on the surface of the hole transport layer, an electron transport layer disposed on the surface of the quantum dot light emitting layer, and a cathode disposed on the surface of the electron transport layer.
In one embodiment, an inversion-structured quantum dot light emitting diode includes a stacked structure of an anode and a cathode disposed opposite each other, a quantum dot light emitting layer disposed between the anode and the cathode, and the cathode is disposed on a substrate. Further, a hole function layer such as a hole injection layer, a hole transport layer, an electron blocking layer and the like can be arranged between the anode and the quantum dot light-emitting layer; an electron-transport layer, an electron-injection layer, a hole-blocking layer and other electron-functional layers can be arranged between the cathode and the quantum dot light-emitting layer. In some embodiments of the device with the inverted structure, as shown in fig. 2, the qd-led comprises a substrate, a cathode disposed on the surface of the substrate, an electron transport layer disposed on the surface of the cathode, a qd-light emitting layer disposed on the surface of the electron transport layer, a hole transport layer disposed on the surface of the qd-light emitting layer, and an anode disposed on the surface of the hole transport layer.
In further embodiments, the substrate layer comprises a rigid, flexible substrate, or the like;
the anode includes: ITO, FTO or ZTO, etc.;
the hole injection layer includes PEODT: PSS (poly (3, 4-ethylenedioxythiophene): poly (styrenesulfonic acid)), WoO3、MoO3、NiO、V2O5HATCN (2,3,6,7,10, 11-hexacyano-1, 4,5,8,9, 12-hexaazatriphenylene), CuS, etc.;
the hole transport layer can be a micromolecular organic matter or a macromolecule conducting polymer, and comprises the following components: TFB (Poly [ (9, 9-di-N-octylfluorenyl-2, 7-diyl) -alt- (4,4' - (N- (4-N-butyl) phenyl) -diphenylamine)]) PVK (polyvinylcarbazole), TCTA (4,4 '-tris (carbazol-9-yl) triphenylamine), TAPC (4,4' -cyclohexylbis [ N, N-bis (4-methylphenyl) aniline)]) Poly-TBP, Poly-TPD, NPB (N, N ' -diphenyl-N, N ' - (1-naphthyl) -1,1' -biphenyl-4, 4' -diamine), CBP (4,4' -bis (9-carbazole) biphenyl), peot: PSS, MoO3、WoO3、NiO、CuO、V2O5CuS, etc.;
the quantum dot light-emitting layer comprises a quantum dot light-emitting layer prepared from the quantum dot ink in an ink-jet printing mode, and the thickness of the quantum dot light-emitting layer is 10-100 nm;
the electron transport layer comprises ZnO, ZnMgO, ZnMgLiO, ZnInO, ZrO, TiO2、Alq3One or more of TAZ (3- (biphenyl-4-yl) -5- (4-tert-butylphenyl) -4-phenyl-4H-1, 2, 4-triazole), TPBI (1,3, 5-tris (1-phenyl-1H-benzimidazol-2-yl) benzene), PBD (2- (4 '-tert-butylphenyl) -5- (4' -biphenyl) -1,3, 4-oxadiazole), BCP (2, 9-dimethyl-4, 7-diphenyl-1, 10-phenanthroline), Bphen (4, 7-diphenyl-1, 10-phenanthroline);
the cathode includes: al, Ag, Au, Cu, Mo, or an alloy thereof.
In order to make the details and operations of the above embodiments of the present invention clearly understood by those skilled in the art and to make the progress of the quantum dot ink and the preparation method thereof obvious, the above technical solutions are illustrated by the following embodiments.
Example 1
A quantum dot ink and a quantum dot light emitting layer, comprising the steps of:
under the condition of stirring, 10 wt% of oleylamine-stabilized red CdSe/ZnS quantum dots, 45 wt% of tetradecane solvent with the purity of more than 99.9% and 45 wt% of 1-cyclopentyl-3-pyridinol with the purity of more than 99.9% are sequentially added into a 500mL single-neck flask and stirred for 30 minutes to obtain the quantum dot ink.
② a red quantum dot layer with 20 multiplied by 30um and resolution of 200 multiplied by 200ppi is printed by an ink-jet printer.
Thirdly, heating to 155 ℃ on a hot plate and vacuumizing to 1 multiplied by 10-4And volatilizing and drying for 30min under the condition of Torr to obtain the monochromatic quantum dot luminescent layer.
Example 2
A quantum dot ink and a quantum dot light emitting layer, comprising the steps of:
under the condition of stirring, 10 wt% of oleylamine-stabilized green CdZnSe/CdZnS quantum dots, 30 wt% of tetradecane solvent with purity more than 99.9%, 40 wt% of o-xylene with purity more than 99.9% and 20 wt% of 4- (1-pyrrolidine) -1-butanol with purity more than 99.9% are sequentially added into a 500mL single-neck flask, and stirred for 30 minutes to obtain the quantum dot ink.
② a green quantum dot layer with 20 multiplied by 30um and resolution of 200 multiplied by 200ppi is printed by an ink-jet printer.
Thirdly, heating the mixture on a hot plate to 180 ℃, and volatilizing and drying the mixture for 30min under nitrogen flow to obtain the monochromatic quantum dot light-emitting layer.
Example 3
A quantum dot ink and a quantum dot light emitting layer, comprising the steps of:
under the condition of stirring, adding 10 wt% of oleylamine-stabilized blue CdS/CdZnS quantum dots, 45 wt% of decalin with purity of more than 99.9%, 35 wt% of cyclohexylbenzene with purity of more than 99.9% and 10 wt% of 2, 2-dimethyl-3-pyrrolidine-1-yl propan-1-ol with purity of more than 99.9% into a 500mL single-neck flask in sequence, and stirring for 30 minutes to obtain the quantum dot ink.
② a red quantum dot layer with 20 multiplied by 30um and resolution of 200 multiplied by 200ppi is printed by an ink-jet printer.
③ cooling to 15 ℃ and vacuum of 1X 10-5And volatilizing and drying for 30min under the condition of Torr to obtain the monochromatic quantum dot luminescent layer.
Comparative example 1
A quantum dot ink and a quantum dot light emitting layer, comprising the steps of: 1.0g of oleylamine stabilized red CdSe/ZnS quantum dot, 6g of tetradecane and 3g of n-octane solvent are mixed and stirred for 30 minutes, and the mixture is filtered by a 0.45 mu filter membrane to obtain the quantum dot ink. Printing with an ink jet printer to obtain red quanta of 20X 30um with a resolution of 200X 200ppiAnd (5) dot layer. Heating to 100 ℃ on a hot plate, nitrogen flow and vacuum of 1X 10-6And volatilizing and drying for 30min under the condition of Torr to obtain the monochromatic quantum dot luminescent layer.
Further, in order to verify the advancement of the quantum dot ink prepared in the embodiment of the present invention, the embodiment of the present invention performs a film formation uniformity test on the quantum dot ink, and the test results are shown in table 1 below:
TABLE 1
Item group classification Uniformity of film formation
Comparative example 1 52%
Example 1 67%
Example 2 75%
Example 3 73%
The test results show that the quantum dot ink prepared in the embodiments 1 to 3 has better film-forming uniformity compared with the quantum dot ink prepared in the comparison document 1, and therefore, the quantum dot material in the quantum dot ink prepared in the embodiments of the present invention can be more uniformly dispersed in the ink system, the uniformity and stability of the quantum dot ink system are ensured, the storage stability is good, the quantum dot ink has the characteristics of appropriate viscosity, surface tension and the like, the matching degree with ink-jet printing and other processes is higher, the ink-discharging stability is better, and the uniformity of the printed film is better.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. The quantum dot ink is characterized by comprising at least one quantum dot material and at least one pyridine alcohol organic solvent, wherein the general structural formula of the pyridine alcohol organic solvent is shown as the following formula I:
Figure FDA0002347920580000011
wherein a and b are respectively and independently integers of 0-2, and a and b are not 0 at the same time;
R1,R2each independently selected from: at least one of substituted or unsubstituted alkyl, substituted or unsubstituted cycloalkyl.
2. The quantum dot ink according to claim 1, wherein the substituted or unsubstituted alkyl group is a substituted or unsubstituted alkyl group having 2 to 25 carbon atoms;
the substituted or unsubstituted cycloalkyl group is a substituted or unsubstituted cycloalkyl group having 3 to 25 carbon atoms;
wherein the substituents in the substituted alkyl group and the substituents in the substituted cycloalkyl group are each independently selected from: aryl, nitro, cyano, amino, halogen, hydroxy, carboxyl, ester, carbonyl, alkenyl, alkynyl, cycloalkyl, alkoxy, aryloxy, heteroaryloxy, alkoxycarbonyl, perfluoroalkyl, perfluoroalkoxy, aryloxy, thioalkoxy, -N (R)3)(R4)、-S(O)2-N(R3)(R4)、-C(=O)-N(R3)(R4)、(R3)(R4) N-alkyl, (R)3)(R4) N-alkoxy radical、(R3)(R4) N-alkylaryloxyalkyl, -S (O)x-aryl, -S (O)x-at least one of heteroaryl, silyl groups; wherein x is an integer of 0-2; r3、R4Each independently selected from: one of alkyl, cycloalkyl and aryl.
3. The quantum dot ink as claimed in claim 2, wherein the alkyl group having 2 to 25 carbon atoms is selected from: at least one of butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, hexadecyl, octadecyl, and isomers thereof; and/or the presence of a gas in the gas,
the cycloalkyl with 3-25 carbon atoms is selected from: at least one of cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclononyl, cyclodecyl, cycloundecyl, and isomers thereof; and/or the presence of a gas in the gas,
the R is3、R4When the alkyl groups are respectively and independently selected from alkyl groups, the alkyl groups are selected from alkyl groups with 1-25 carbon atoms; and/or the presence of a gas in the gas,
the aryl group is selected from: at least one of phenyl, biphenyl, triphenyl, benzo group, naphthyl, anthryl, peribenzo naphthyl, phenanthryl, fluorenyl, pyrenyl, chrysenyl, perylene group and azulenyl; and/or the presence of a gas in the gas,
the heteroaryl group is selected from: dibenzothienyl, dibenzofuryl, furyl, thienyl, benzofuryl, benzothienyl, carbazolyl, pyrazolyl, imidazolyl, triazolyl, isoxazolyl, thiazolyl, oxadiazolyl, thiadiazolyl, pyridyl, pyridazinyl, pyrimidinyl, pyrazinyl, triazinyl, oxazinyl, thiazinyl, oxadiazolyl, indolyl, benzimidazolyl, indazolyl, indolizinyl, benzoxazolyl, isoxazolyl, benzothiazolyl, quinolyl, isoquinolyl, o-diaza-naphthyl, quinazolinyl, quinoxalinyl, naphthyl, phthalidyl, pteridinyl, xanthinyl, acridinyl, phenazinyl, phenothiazinyl, phenoxazinyl, dibenzoselenophenyl, benzoselenophenyl, benzofuropyridylpyrazolyl, indolocarbazolyl, pyridylindolyl, pyrrolydipyridoindolyl, At least one of furan bipyridyl, benzothiophene furopyridinyl, thienobipyridyl, benzoselenophenopyridine, and selenophenedipyridinyl.
4. The quantum dot ink of claim 3, wherein the pyridinol-based organic solvent is selected from the group consisting of: (3S) -1- (2-aminoethyl) -3-pyridinol, (3R) -1- (2-aminoethyl) -3-pyridinol, (R) -3-pyridinol, (S) -3-pyridinol, 1- (5-bromo-2-pyrimidine) -3-pyridinol, (3R,4S) -4- [ (methylthio) methyl ] -3-pyridinol, (3S) -1- (2-aminoethyl) -3-pyridinol, (3R) -1- (2-aminoethyl) -3-pyridinol, (R) -3-pyridinol, (S) -3-pyridinol, (3R,4S) -4- [ (methylthio) methyl ] -3-pyridinol, (3R,5S) -5- (aminomethyl) -1-methyl-3-pyridinol, 1- (4-piperidinyl) -3-pyridinol, (S) - (+) -1-Cbz-3-pyridinol, 3- (4-ethoxyphenyl) -3-pyridinol, 2-methyl-1-nitroso-2-pyridinol, 1- (4-amino-2-ethylphenyl) -3-pyridinol, 1- (diaminomethyl) -2-pyridinol, (3R,5S) -5-hydroxymethyl-3-pyridinol, 1-benzyl-3- (trifluoromethyl) -3-pyridinol, and their use as anti-inflammatory agents, 4-amino-3-pyridinol, 5-methyl-3-pyridinol, 3- (hydroxymethyl) -2,2,5, 5-tetramethyl-1-pyridinol, (3S) -3- (methoxymethoxy) -1-pyridinol, 1- (4-bromophenyl) -3-pyridinol, 1-methyl-3-pyridinol, 1- (2-chloro-3-hydroxyphenyl) -2-pyridinol, 4- [ (2-hydroxyethyl) amino ] -3-pyridinol, (3R) -1- (2-methoxyethyl) -3-pyridinol, 1-cyclopentyl-3-pyridinol, 1-amino-3-pyridinol, (S) -1-benzyl-3-pyridinol, 1-isopropyl-3-pyridinol, (1S,2R) -1-phenyl-2- (1-pyrrolidinyl) -1-propanol, 1- (3-hydroxypropyl) pyrrolidine, (3S,4S) -1-benzylpyrrolidine-3, 4-diol, (3R,4R) - (-) -1-benzyl-3, 4-pyrrolidinediol, trans-4- (1-pyrrolidinyl) tetrahydro-3-furanol, 4- (1-pyrrolidine) -1-butanol, (1R,2S) -1-phenyl-2- (1-pyrrolidinyl) -1-propanol, and mixtures thereof, (3S,4S) -pyrrolidine-3, 4-diol, (2R,3R,4S) -2- (2-hydroxyethyl) -3, 4-pyrrolidinediol, 3-allyl-1-benzylpyrrolidin-3-ol, 2-phenyl-3-pyrrolidin-1-yl-propan-1-ol, (S) -2- (1-benzylpyrrolidin-2-yl) propan-2-ol, 5- (1-pyrrolidinyl) -3-pentyn-1-ol, 2-methyl-2- (pyrrolidin-1-yl) propan-1-ol, 2-dimethyl-3-pyrrolidin-1-ylpropan-1-ol, and mixtures thereof, 2-methyl-3-pyrrolidin-1-propan-1-ol, 1- (5-aminopyridin-2-yl) pyrrolidin-3-ol, 2, 5-bis (hydroxymethyl) -3, 4-pyrrolidinediol, 1-phenylmethyl-3, 4-pyrrolidinediol, (3R,4R) - (-) -1-benzyl-3, 4-pyrrolidinediol, 2- (hydroxymethyl) -1-methyl-3, 4-pyrrolidinediol, 1- (2-aminoethyl) pyrrolidin-3-ol, 1- (5-aminopyridin-2-yl) pyrrolidin-3-ol, 1- (hydroxymethyl) -3-ol, 4-pyrrolidinediol, and mixtures thereof, (3R,4R) -3, 4-pyrrolidinediol, 2- (pyrrolidin-1-yl) ethanethiol, 3-pyrrolidin-2-propan-1-ol, 1-methyl-2 beta-benzyl-5 beta-nonylpyrrolidin-3 beta-ol, (3S,4R) -pyrrolidine-3, 4-diol, 1-benzyl-4-methyl-pyrrolidin-3-ol, 4- (pyrrolidin-1-yl) -2-butyn-1-ol, (R) -1- (pyridin-4-yl) pyrrolidin-3-ol, (S) -1- (pyridin-4-yl) pyrrolidin-3-ol, and mixtures thereof, 2,3' -bipyrrolidin-4-ol, (R) -1- (3-fluorophenyl) pyrrolidin-3-ol, 2- (pyrrolidin-3-yl) propan-2-ol, 1-benzyl-3, 4-pyrrolidinediol, (2R,3S,4R) -2- (2-aminoethyl) -3, 4-pyrrolidinediol, (2R,3S,4R) -2- (2-anilinoethyl) -3, 4-pyrrolidinediol, (2S,3R,4S) -2- {2- [ (2-hydroxybutyl) amino ] ethyl } -3, 4-pyrrolidinediol, (2S,3R,4S) -2- [2- (4-morpholinyl) ethyl ] -3, 4-pyrrolidinediol, (2R,3S,4R) -2- {2- [ (4-hydroxybutyl) amino ] ethyl } -3, 4-pyrrolidinediol, (2R,3R,4S) -2- (hydroxymethyl) pyrrolidine-3, 4-diol, (3S,4S) -1-octyl-3, 4-pyrrolidinediol, 1-methyl-3-pyridinol, 1-ethyl-3-pyridinol, 1-benzyl-3-pyridinol, (R) - (+) -1-benzyl-3-pyridinol, (R) - (-) -1-methyl-3-pyridinol, N-tert-butoxycarbonyl-L-prolinol, N-octylamino-3, 4-pyrrolidinediol, 1-methyl-3-pyridinol, 1-ethyl-3-pyrid, At least one of N- (tert-butyloxycarbonyl) -D-prolinol and N-benzyl-L-prolinol.
5. The quantum dot ink according to any one of claims 1 to 4, wherein the boiling point of the quantum dot ink is 80 ℃ to 380 ℃; and/or the presence of a gas in the gas,
the viscosity of the quantum dot ink is 0.5 to 60cPs at the temperature of between 25 and 35 ℃; and/or the presence of a gas in the gas,
the surface tension of the quantum dot ink in an environment of 25-35 ℃ is 20-60 mN/m.
6. The quantum dot ink of claim 5, wherein: the quantum dot ink comprises the following components in percentage by mass based on the total mass of the quantum dot ink being 100%:
0.01 to 45 percent of quantum dot material,
10 to 90 percent of pyridine alcohol organic solvent.
7. The quantum dot ink of claim 6, wherein: the quantum dot ink further comprises an auxiliary organic solvent and/or an auxiliary agent, and the quantum dot ink comprises the following components in percentage by mass based on the total mass of the quantum dot ink being 100%:
Figure FDA0002347920580000041
8. the quantum dot ink of claim 7, wherein the auxiliary organic solvent is selected from the group consisting of: at least one of chlorobenzene, o-dichlorobenzene, tetrahydrofuran, anisole, morpholine, toluene, o-xylene, m-xylene, p-xylene, n-hexane, dichloromethane, chloroform, 1, 4-dioxane, 1, 2-dichloroethane, 1,1, 1-trichloroethane, 1,1,2, 2-tetrachloroethane, tetrahydronaphthalene, decalin, phenoxytoluene, dodecane, 1-methoxynaphthalene, 1-butylnaphthalene, o-dimethoxybenzene, 1-methylnaphthalene, 1, 2-dimethylnaphthalene, cyclohexylbenzene, 1,2, 4-trimethoxybenzene, phenylhexane, tetradecane, 1, 2-dimethylnaphthalene, 4-isopropylbiphenyl, 2-isopropylnaphthalene, 1-ethylnaphthalene and 1,2,3, 4-tetrahydronaphthalene; and/or the presence of a gas in the gas,
the auxiliary agent is selected from: at least one of a charge transport agent, a viscosity modifier, and a dispersant.
9. The quantum dot ink of claim 8, wherein the charge transport agent is selected from the group consisting of: at least one of polycarbazole, polyfluorene, polyaniline, polyparaphenylethene, polyparaphenyleneethynylene, polyacetylene, polyparaphenylene, polythiophene, polypyridine, polypyrrole, polycarbazole derivative, polyfluorene derivative, polyaniline derivative, polyparaphenylethene derivative, polyparaphenylethynylene derivative, polyacetylene derivative, polyparaphenylene derivative, polythiophene derivative, polypyridine derivative, and polypyrrole derivative; and/or the presence of a gas in the gas,
the viscosity modifier is selected from: at least one of a polyhydric alcohol, an alkyl glycol ether or trimethylolpropane, trimethylolethane, casein and carboxymethylcellulose; and/or the presence of a gas in the gas,
the dispersant is selected from: any one of an anionic surfactant, a cationic surfactant, a nonionic surfactant and an amphoteric surfactant.
10. The preparation method of the quantum dot film is characterized by comprising the following steps:
providing a substrate;
depositing the quantum dot ink as claimed in any one of claims 1 to 9 on the substrate, and then drying to obtain the quantum dot thin film.
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