CN106188429B - Quantum dot composition, quantum dot composite material, preparation method and application - Google Patents

Quantum dot composition, quantum dot composite material, preparation method and application Download PDF

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CN106188429B
CN106188429B CN201610632828.8A CN201610632828A CN106188429B CN 106188429 B CN106188429 B CN 106188429B CN 201610632828 A CN201610632828 A CN 201610632828A CN 106188429 B CN106188429 B CN 106188429B
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quantum dot
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epoxy
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CN106188429A (en
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方龙
赵飞
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Najing Technology Corp Ltd
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Abstract

The present invention provides a kind of quantum dot composition, quantum dot composite material, preparation method and applications.Wherein, quantum dot composition includes quantum dot and macromolecule matrix solidfied material precursor, and macromolecule matrix solidfied material precursor includes Epoxy Phenolic Acrylates block copolymer.Above-mentioned quantum dot composition includes macromolecule matrix solidfied material precursor of the Epoxy Phenolic Acrylates block copolymer as dispersion quantum dot by selecting, since Epoxy Phenolic Acrylates block copolymer combines the advantages of acrylate and quantum dot compatibility are good and epoxy resin is to oxygen and aqueous vapor good barrier property, and epoxy block is linked with arylate blocks by chemical bond and effect, has extraordinary chemical stability.The application sets about in terms of macromolecule matrix solidfied material precursor material composition, solve the problems, such as with the compatibility of quantum dot and starvation and aqueous vapor, improve the luminous efficiency and stability of quantum dot composite material.

Description

Quantum dot composition, quantum dot composite material, preparation method and application
Technical field
The present invention relates to quantum dot composite material fields, compound in particular to a kind of quantum dot composition, quantum dot Material, preparation method and application.
Background technology
Quantum dot, and can be described as nanocrystalline, it is a kind of nano particle being made of II-VI group or iii-v element.Amount The grain size of son point is typically in the range of between 1~10nm, and since electrons and holes are by quantum confinement, continuous band structure becomes to have The discrete energy level structure of molecular characterization can emit fluorescence after being excited.Based on quantum effect, quantum dot is in solar cell, hair The fields such as optical device and optical bio label are with a wide range of applications.
Quantum dot has exciting light spectrum width and continuously distributed, and emission spectrum is narrow and symmetrical, Color tunable, photochemical stable Property high, the superior fluorescent characteristic such as fluorescence lifetime length.By the shape, structure and size that control quantum dot, so that it may with easily Its energy gap width, exciton are adjusted (in semiconductor, if an electronics is gone on from full valence to empty conduction band, in valence With one hole of interior generation, and an electronics is generated in conduction band, to form an electron-hole pair.Hole is positively charged, electricity Subband negative electricity, the coulomb adelphotaxy between them can be spatially bound together under certain conditions, such shape At complex be known as exciton) (bands of a spectrum of organic compound are often because of substituent group for the energy blue shift of the size of binding energy and exciton Change with quantity of solvent makes maximum absorption wavelength and absorption intensity change.It is known as when maximum wavelength is moved to shortwave direction Blue shift;Blue shift refers to the frequency of the electromagnetic wave that the object of positive observer's movement is scattered on spectrum line to the direction at blue end It is mobile, it is meant that wavelength reduces.With the reduction of particle size color to blue light direction move) etc. electronic states.Therefore, can lead to The size for crossing control quantum dot obtains the arbitrarily desired color in visible light region, and can be obtained by the size of control half-peak breadth The monochromatic light of pure color can increase substantially colour gamut and color saturation for display field.
Between being typically in the range of 1~10nm due to the grain size of quantum dot, there is very big specific surface area, surface phase atomicity Increase, the coordination for resulting in surface atom is insufficient, unsaturated bond and dangling bond (i.e. the unpaired electronics of crystalline surface) increase, and makes These surface atoms have high activity, extremely unstable, it is easy to be combined with other atoms.Therefore, general quantum dot surface needs Suitable ligand is selected to be coordinated with the metal of quantum dot surface, the type of ligand has certainly the efficiency and stability of quantum dot Qualitatively influence.With the development and optimization of quantum dot synthetic technology, the efficiency and stability of quantum dot have reached industrialization Level.But the unique skin effect of quantum dot also determines that its sensibility to aqueous vapor and oxygen, aqueous vapor and oxygen can be broken The ligand of bad quantum dot surface reduces the efficiency of quantum dot.Quantum dot size is smaller, and specific surface area is bigger, to aqueous vapor and oxygen Sensibility it is higher.
With the maturation of quanta point material, the application of quanta point material is more and more wider, especially in display field.But it measures Son point material cannot be used alone, it is necessary to be dispersed in macromolecule matrix.In view of the characteristic of quantum dot itself, macromolecule matrix There must be following characteristic:(1) there is preferable compatibility with quanta point material, the luminous efficiency of quantum dot can be kept well (2) there is preferable barrier property to aqueous vapor and oxygen;It (3) can be by liquid curing at solid-state under the action of light or heat.
Macromolecule matrix about dispersion quantum dot has many reports, can be summarized as following a few classes:(1) to quantum dot surface It carries out silicone-modified, selects organosilicon material as macromolecule matrix, be mainly used for the encapsulation in situ of LED chip.Organosilicon Material has extraordinary thermal stability and optical stability, still, due to the high-flexibility of organosilicon material silicon oxygen bond and big Bond angle, it is poor to the barrier property of aqueous vapor and oxygen.Under conditions of high temperature and blue light illumination, quanta point material be easy by The destruction of aqueous vapor and oxygen and fail.(2) it is made using porous material absorption quantum dot or by quantum dot epoxy resin cladding Microballoon.Epoxy resin is poor with the compatibility of quantum dot due to higher polarity, and hair is easy under conditions of high temperature illumination Huang influences quantum dot luminous efficiency.(3) select acrylate monomer or polyacrylate as macromolecule matrix.Acrylate There are preferable compatibility, quantum dot that can preferably be dispersed in acrylate with quantum dot.But acrylate is to aqueous vapor and oxygen The barrier property of gas is poor.(4) phase separation structure is formed, disperses quantum dot using hydrophobic systems (acrylate), outer layer is used Hydrophilic system (epoxy resin) starvation, is macroscopically forming phase separation structure.Nothing between acrylic resin and epoxy resin Chemical bond and effect, there are certain defects for long-term chemical durability aspect.
Therefore, it is still necessary to the application of quantum dot in the prior art is improved, to improve the luminous efficiency of quantum dot And stability.
Invention content
The main purpose of the present invention is to provide a kind of quantum dot composition, quantum dot composite material, preparation method and Using, with solve the prior art due to aqueous vapor and oxygen barrier property difference or with dispersion quantum dot matrix poor compatibility and lead The low problem of the luminous efficiency of the quantum dot composite material of cause.
To achieve the goals above, according to an aspect of the invention, there is provided a kind of quantum dot composition, quantum dot group It includes quantum dot and macromolecule matrix solidfied material precursor to close object, and macromolecule matrix solidfied material precursor includes epoxy novolac-acrylic acid Ester block copolymer.
Further, epoxy novolac-acrylate block copolymer is that epoxy novolac-acrylate of following structural formula is embedding Duan Gongju
Object:Wherein, x, y are integer, and x >=1, y >=1, and 3≤x+y≤7.
Further, further include crosslinking agent in quantum dot composition, preferably crosslinking agent is double/three-functionality-degree acrylic monomers And/or double/three-functionality-degree epoxy monomer;More preferably double/three-functionality-degree acrylic monomers and/or double/three-functionality-degree epoxy monomer Mass ratio with epoxy novolac-acrylate block copolymer is 1~3:10~20.
Further, in quantum dot composition further include curing agent, preferred consolidation agent is radical UV curing agent and thermosetting Agent, or be radical UV curing agent and cation photocuring agent.
Further, quantum dot composition further includes additive, and preferable additives are light diffusion particle and/or antioxidant.
According to another aspect of the present invention, a kind of preparation method of quantum dot composite material is provided, preparation method includes: Macromolecule matrix solidfied material precursor, crosslinking agent, curing agent quantum dot and optional additive are mixed to get the first mixture; First mixture is cured, quantum dot composite material is obtained;Wherein, macromolecule matrix solidfied material precursor includes phenolic aldehyde ring Oxygen-acrylate block copolymer.
Further, the structural formula of epoxy novolac-acrylate block copolymer is:
Wherein, x, y are integer, and x >=1, y >=1, and 3≤x+y ≤7。
Further, crosslinking agent is bifunctionality acrylic monomers, three-functionality-degree acrylic monomers, bifunctionality epoxy list Body and/or three-functionality-degree epoxy monomer;The mass ratio of more preferable crosslinking agent and epoxy novolac-acrylate block copolymer is 1 ~3:10~20.
Further, curing agent is radical UV curing agent and thermal curing agents, and the step of preferred consolidation includes:Using freedom The first mixture of base light curing agent pair carries out photocuring, obtains solidification semi-finished product;Solidification semi-finished product are carried out using thermal curing agents Heat cure obtains quantum dot composite material.
Further, curing agent is radical UV curing agent and cation photocuring agent, and the step of solidification includes:In freedom The first mixture is cured under being acted on while base light curing agent and cation photocuring agent, obtains quantum dot composite wood Material.
Further, additive is light diffusion particle and/or antioxidant.
According to an aspect of the present invention, a kind of quantum dot composite material is provided, quantum dot composite material uses above-mentioned A kind of preparation method is prepared.
According to another aspect of the present invention, a kind of quantum dot composite material is provided, quantum dot composite material includes quantum Point and the macromolecule matrix solidfied material being coated on around quantum dot, macromolecule matrix solidfied material are that epoxy novolac-acrylate is embedding Cross-linking products between section copolymer, cross-linking products have the structural unit as shown in following formula (I):
To achieve the goals above, according to a further aspect of the invention, a kind of quantum dot light emitting device is provided, including Quantum dot composite material, quantum dot composite material are above-mentioned quantum dot composite material.
Further, the quantum dot in quantum dot composite material is red quantum dot and/or green quantum dot.
Further, quantum dot light emitting device is quantum dot film or quantum dot pipe.
It applies the technical scheme of the present invention, above-mentioned quantum dot composition is embedding comprising epoxy novolac-acrylate by selection Macromolecule matrix solidfied material precursor of the section copolymer as dispersion quantum dot, due to epoxy novolac-acrylate block copolymer The advantages of acrylate and quantum dot compatibility are good and epoxy resin is to oxygen and aqueous vapor good barrier property is combined, and epoxy is embedding Section is linked with arylate blocks by chemical bond and effect, has extraordinary chemical stability.The application is from polymer-based Set about in terms of body solidfied material precursor material composition, solve the problems, such as with the compatibility of quantum dot and starvation and aqueous vapor, Improve the luminous efficiency and stability of quantum dot composite material.
Description of the drawings
The accompanying drawings which form a part of this application are used to provide further understanding of the present invention, and of the invention shows Meaning property embodiment and its explanation are not constituted improper limitations of the present invention for explaining the present invention.In the accompanying drawings:
Fig. 1 (a), Fig. 1 (b) and Fig. 1 (c), which are shown in a kind of preferred embodiment according to the present invention, forms lamellar phase The microcosmic chain form schematic diagram of epoxy novolac-acrylate block copolymer of separation:Before Fig. 1 (a) solidifications;Fig. 1 (b) photocurings Afterwards;After Fig. 1 (c) heat or photocuring;
Fig. 2 (a), Fig. 2 (b) and Fig. 2 (c), which are shown in a kind of preferred embodiment according to the present invention, forms spherical phase The microcosmic chain form schematic diagram of epoxy novolac-acrylate block copolymer of separation:Wherein, before Fig. 2 (a) solidifications;Fig. 2 (b) After photocuring;After Fig. 2 (c) heat or photocuring;
In above-mentioned attached drawing 1 (a) to attached drawing 2 (b), individual pore represents green quantum dot, and individually big stain represents Red quantum dot, the molecules present novolac epoxy resin block with pore on linear segment, the generation with double bond on linear segment The monomer molecule of table arylate blocks, three double bonds represents acrylic monomers, and the monomer molecule of three pores represents epoxy Monomer, the corresponding reference numeral of above compound are respectively:
10, green quantum dot;20, red quantum dot;30, novolac epoxy resin block;40, arylate blocks;50, third Acrylic monomer;60, epoxy monomer;80, arylate blocks cured layer;90, novolac epoxy resin block cured layer;100, first Shell;110, the second shell.
Specific implementation mode
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase Mutually combination.Below in conjunction with embodiment, the present invention will be described in detail.
In the application, epoxy novolac-acrylate block copolymer refers to that novolac epoxy resin is formed with acrylate Block copolymer.
As background technology part is previously mentioned, due to the barrier property difference to aqueous vapor and oxygen or the matrix with dispersion quantum dot Poor compatibility and cause quantum dot light emitting material in the prior art to there is a problem of that luminous efficiency is low and stability difference, in order to change It is apt to this situation, in a kind of typical embodiment of the present invention, provides a kind of quantum dot composition, the quantum dot composition Including quantum dot and macromolecule matrix solidfied material precursor, macromolecule matrix solidfied material precursor includes that epoxy novolac-acrylate is embedding Section copolymer.
Above-mentioned quantum dot composition is by selecting comprising epoxy novolac-acrylate block copolymer as dispersion quantum dot Macromolecule matrix solidfied material precursor, since epoxy novolac-acrylate block copolymer combines acrylate and quantum dot The advantages of compatibility is good and epoxy resin is to oxygen and aqueous vapor good barrier property, and epoxy block and passing through of arylate blocks It learns key and effect links, there is extraordinary chemical stability, in terms of macromolecule matrix solidfied material precursor material composition Set about, solve the problems, such as with the compatibility of quantum dot and starvation and aqueous vapor, improve the hair of quantum dot composite material Light efficiency and stability.
In above-mentioned quantum dot composition, epoxy novolac-acrylate block copolymer is novolac epoxy resin and acrylic acid React the not only block copolymer containing epoxy group but also containing acrylic acid groups formed.Its reaction route is as follows:
Wherein, n=x+y, x, y are integer, and x >=1, y >=1, and 3≤n=x+y≤7.
The block copolymer of heterogeneity can be obtained in the ratio for adjusting above-mentioned novolac epoxy resin and acrylic acid.In this hair In a kind of bright preferred embodiment, above-mentioned novolac epoxy resin-acrylic block copolymers are the epoxy novolac of following structural formula Resin-propylene acid block copolymer:Wherein, x >=1, Y >=1, and 3≤x+y≤7.Different phase separation structures can be formed according to the size of x and y.As x and y approximately equals, phenolic aldehyde ring Oxygen-acrylate block copolymer formation stratiform phase separation structure, novolac epoxy resin block and arylate blocks rule It is arranged in layer structure.As shown in Fig. 1 (a), Fig. 1 (b) and Fig. 1 (c), novolac epoxy resin block 30 is arranged in side, propylene Acid esters block 40 is arranged in the other side.And work as x=1, when y=5, epoxy novolac-acrylate block copolymer then forms spherical Phase separation structure.Such as Fig. 2 (a) to Fig. 2 (c), arylate blocks 40 since segment is shorter, flock together to be formed it is spherical in The heart, and novolac epoxy resin block 30 is then arranged in outside, is formed to arylate blocks 40 and surrounds shape.Quantum dot (including it is green Color quantum dot 10 and red quantum dot 20) due to preferable with the compatibility of arylate blocks 40, preferentially it is dispersed in acrylate In block 40.
In above-mentioned quantum dot composition, special want is had no to the amount ratio of quantum dot and macromolecule matrix solidfied material precursor It asks, as long as macromolecule matrix solidfied material precursor can be evenly dispersed to quantum dot progress, and the luminous efficiency of quantum dot can be maintained With stability.For example, a certain amount of macromolecule matrix solidfied material precursor can be to one or a group amount according to actual needs Son point is disperseed.In a kind of preferred embodiment of the present invention, the mass ratio of quantum dot and macromolecule matrix solidfied material precursor It is 0.1~1:10~100.Specific ratio need to be depending on objective optics parameter.
In above-mentioned quantum dot composition, according to actual needs, can will be prepared into it is required a kind of in product process or Various other auxiliary elements are included, and can not also be included and are provided separately in specific preparation process.In this hair Further include crosslinking agent in above-mentioned quantum dot composition, preferably crosslinking agent is more than for degree of functionality in bright another kind preferred embodiment The acrylic monomers and/or difunctionality of acrylic monomers equal to 2 or epoxy monomer, more preferably bifunctionality or three-functionality-degree The epoxy monomer of degree or three-functionality-degree.
Crosslinking agent herein is internal crosslinker, is entered in macromolecular structure chain in polymerization as a kind of monomer, Huo Zhezuo Be added in macromolecule matrix solidfied material precursor for a component, can storage-stable, only be heated to certain temperature or Radiation condition can just crosslink reaction.It is preferred that the acrylic monomers and epoxy monomer of three-functionality-degree are as crosslinking agent, activity Group forms cross-linked structure with arylate blocks and novolac epoxy resin block reaction respectively, and cross-linking efficiency is high, and does not occur Adverse reaction and cohesion.
It is highly preferred that the acrylic monomers of above-mentioned bifunctionality or three-functionality-degree be selected from 1,6- hexanediyl esters, Triethylene-glycol dimethylacrylate, Tricyclodecane Dimethanol diacrylate, three (2- ethoxys) isocyanic acids, three propylene Acid esters, pentaerythritol triacrylate, trimethylolpropane trimethacrylate, 3- ethyoxyls-trimethylolpropane tris acrylic acid Ester, 9- ethyoxyls-trimethylolpropane trimethacrylate, propoxyl group-trimethylolpropane trimethacrylate and trihydroxy methyl It is one or more in propane trimethyl acrylic ester.The epoxy monomer of above-mentioned bifunctionality or three-functionality-degree is selected from ethylene glycol two Glycidol ether, 1,6- hexanediol diglycidyl ethers, 1,4-butanediol diglycidyl ether, trimethylolpropane tris shrink sweet It is one or more in oily ether and triglycidyl isocyanurate.These crosslinking agents are ensureing curing rate and the degree of cross linking Under the premise of, there is preferable flexibility and intensity.
In above-mentioned quantum dot composition, according to actual production technique and the specific kind of difference of crosslinking agent, used in The dosage of crosslinking agent can be by suitably adjusting to obtain.In another preferred embodiment of the invention, bifunctionality or three officials The acrylic monomers and/or bifunctionality of energy degree or the epoxy monomer of three-functionality-degree and epoxy novolac-acrylic ester block The mass ratio of object is 1~3:10~20.In the range by mass ratio control, it can be realized under the premise of relatively fewer dosage The cross-linking effect that speed well and cross-linked structure are stablized.
It has been observed that according to actual needs, other required one or more auxiliary in product process can will be prepared into Ingredient is included.Further include curing agent in above-mentioned quantum dot composition in another preferred embodiment of the invention, it is excellent It is radical UV curing agent and thermal curing agents or radical UV curing agent and cation curing agent to select curing agent.Free radical light The more preferable UV free radical curing agents of curing agent, the more preferable cation photocuring agent of cation curing agent.
The specific type of radical UV curing agent in above preferred embodiment includes but are not limited to 1- hydroxy-cyclohexyls Phenyl ketone (photoinitiator 184), 2- methyl-1s-[4- methyl mercaptos phenyl] -2- morpholinyl -1- acetone (photoinitiator 907), 2- hydroxyls Base-aminomethyl phenyl propane -1- ketone (photoinitiator 1173), 2,4,6- trimethylbenzoy-dipheny phosphine oxide (photoinitiators TPO), bis- (2,4, the 6- trimethylbenzoyl) phosphine oxides (photoinitiator 819) of phenyl, 2- phenyl benzyl -2- dimethyl amines -1- [4- morpholine benzyls phenyl]-butanone (photoinitiator 369), α, alpha, alpha-dimethyl oxygroup-α-phenyl acetophenone (photoinitiator 651), hexichol Any one or a few in ketone (photoinitiator b P) and methyl benzoylformate (photoinitiator MBF).Cationic photopolymerization is solid The specific type of agent includes but are not limited to 4,4'- dimethyl diphenyl salt compounded of iodine hexafluorophosphate, bis- (4- 2-methyl-2-phenylpropanes bases) Iodine hexafluorophosphate, bis- (4- 2-methyl-2-phenylpropanes base) iodine fluoroform sulphonates, cyclopropyl diphenyl sulphur tetrafluoroborate, diphenyl Iodine hexafluorophosphate, diphenyl iodine arsenate, diphenyl iodine trifluoro-methanyl sulfonate, triphenyl sulphur tetrafluoroborate, Any one or a few in triphenyl phosphonium bromide sulfonium and tri-p-tolylsulfonium hexafluorophosphate.The specific type packet of thermal curing agents Include but lose be limited to ethylenediamine, diethylenetriamine, polyethylene polyamine, dipropylenetriamine, m-phenylene diamine (MPD), two amido diphenyl sulfones, Hydroxyethyl ethylenediamine, benzophenone tetracarboxylic dianhydride, tetrabydrophthalic anhydride, glutaric anhydride, methylhexahydrophthalic anhydride, Any one or a few in benzene tetracarboxylic acid acid anhydride, 2-methylimidazole and 2- ethyl imidazol(e)s.These curing agent have applicability wide, The advantages that curing rate is fast, and curing efficiency is high, being used in combination has certain synergistic effect, obtains solidfied material of good performance.
In actual production, according to the difference of the performance requirement for the luminescent device to be prepared, above-mentioned quantum dot composition In can also include improving or the ingredient comprising its performance, to further increase the luminous efficiency of quantum dot in luminescent device And stability of photoluminescence.Further include additive in above-mentioned quantum dot composition, this adds in another preferred embodiment of the invention It is light diffusion particle and/or antioxidant to add agent.
In above preferred embodiment, the conventional photodiffusion material of light diffusion particle selection, in the present invention include but It is not limited only to TiO2、Zr2O3、ZnO、Al2O3、BaSO4、CaCO3、SiO2And any one or a few in organic silicon.Antioxygen Agent includes but are not limited to 4- hydroxy-dodecanoic acids anilid, N, double -3 (3, the 5- di-t-butyl -4- hydroxyls of six methines of N'- Phenyl) propionamide, 4,4-, bis- t-octyl diphenylamines, 2,6-di-tert-butyl p-cresol (BHT), β (3,5- di-t-butyl -4- hydroxyls Phenyl) propionic acid octadecyl (antioxidant 1076), four [β-(3,5- di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol esters (antioxidant 1010), three [2.4- di-tert-butyl-phenyls] phosphite esters (irgasfos 168), bis- (2,4- DI-tert-butylphenol compounds) seasons penta Any one in tetrol diphosphites (antioxidant 626) and the double octadecyl esters (antioxidant 618) of pentaerythrite diphosphorous acid Or it is several.Light diffusion particle can effectively improve the luminous efficiency of quantum dot, and antioxidant helps to extend quantum dot composite material Stability.On the one hand, the light diffusion particle of mentioned kind has preferable light diffusion effect, can effectively improve quantum dot effect Rate, and cost is relatively low, preferably dissolves each other with physical efficiency before macromolecule matrix solidfied material.On the other hand, the antioxidant tool of mentioned kind Phenomena such as having preferable antioxidant effect, xanthochromia and the degradation of macromolecule matrix solidfied material precursor can be effectively inhibited.Moreover, being obstructed Phenols and phosphite ester kind antioxidant are used in compounding the synergistic effect that can reach certain, have more good antioxidant effect.
In another typical embodiment of the invention, a kind of preparation method of quantum dot composite material is provided, it should Preparation method includes:Macromolecule matrix solidfied material precursor, crosslinking agent, curing agent, quantum dot and optional additive are carried out Mixing, obtains the first mixture;First mixture is cured, quantum dot composite material is obtained;Wherein, macromolecule matrix is solid Compound precursor includes epoxy novolac-acrylate block copolymer.
The preparation method of above-mentioned quantum dot composite material, by using having both insulating of the epoxy resin to aqueous vapor and oxygen Epoxy novolac-acrylate block copolymer of the good advantage of the compatibility of the good and acrylate of energy and quantum dot is as amount The macromolecule matrix solidfied material precursor of son point, the solidification caused by the crosslinking of crosslinking agent and curing agent successfully solve with The compatibility of quantum dot and barrier sex chromosome mosaicism, and the presence of additive also contributes to improve the efficiency of quantum dot and steady in a long-term Property.
In above-mentioned preparation method, the ratio of two blocks can be according to reality in epoxy novolac-acrylate block copolymer The difference that border needs rationally is adjusted.Different phase separation structures can be formed according to the adjustment of the size of x and y.When x is approximate with y When equal, epoxy novolac-acrylate block copolymer forms stratiform phase separation structure, novolac epoxy resin block and acrylic acid Ester block rule is arranged in layer structure.As shown in Fig. 1 (a), Fig. 1 (b) and Fig. 1 (c), novolac epoxy resin block 30 arranges In side, arylate blocks 40 are arranged in the other side, and arylate blocks 40 first form acrylic acid under the action of photocuring Ester block cured layer 80;Then novolac epoxy resin block 30 forms novolac epoxy resin under the action of heat cure or photocuring Block cured layer 90.And work as x=1, when y=5, epoxy novolac-acrylate block copolymer then forms spherical phase separation structure. As shown in Fig. 2 (a), Fig. 2 (b) and Fig. 2 (c), arylate blocks 40 since segment is shorter, flock together to be formed it is spherical in The heart, and novolac epoxy resin block 30 is then arranged in outside, is formed to arylate blocks 40 and surrounds shape.Quantum dot (including it is green Color quantum dot 10 and red quantum dot 20) due to preferable with the compatibility of arylate blocks 40, preferentially it is dispersed in acrylate In block 40.After radical UV curing, arylate blocks 40 are first cured to be formed around green quantum dot 10 and amount of red First shell 100 of son point 20, then under the action of heat cure or photocuring, novolac epoxy resin block 30 is formed by curing The periphery of first shell 100 forms the second shell 110.
In the above preparation method, the mass ratio of quantum dot and macromolecule matrix solidfied material precursor can be according to being intended to prepare Requirement of the luminous product to luminescent properties reasonably select.Quantum dot can be single quantum dot, or numerous Quantum dot.In a kind of preferred embodiment of the present invention, the mass ratio of above-mentioned quantum dot and macromolecule matrix solidfied material precursor It is 0.1~1:10~100.It within the above range by the control of the mass ratio of quantum dot and macromolecule matrix solidfied material precursor, can base This meets requirement of the current luminous product to luminescent properties.
Crosslinking agent used in above-mentioned preparation method is the crosslinking agent of routine, and dosage can be according to specific crosslinking agent kind The difference of class and it is different.In a kind of preferred embodiment of the present invention, above-mentioned crosslinking agent is the acrylic acid that degree of functionality is more than or equal to 2 Monomer and epoxy monomer;More preferable crosslinking agent is three-functionality-degree acrylic monomers and epoxy monomer;More preferable three-functionality-degree propylene The mass ratio of acid monomers and epoxy monomer and epoxy novolac-acrylate block copolymer is 1~3:10~20.Degree of functionality is more than Acrylic monomers and epoxy monomer equal to 2 have curing rate fast and the advantages such as degree of cross linking height.And by bifunctionality or three officials The mass ratio of energy degree acrylic monomers and epoxy monomer and epoxy novolac-acrylate block copolymer is controlled 1~3:10~ In the range of 20, under the premise of ensureing fast curing rate and degree of cross linking height, the flexibility demand of solidfied material is balanced.
Particular/special requirement is had no to the specific type of used curing agent in above-mentioned preparation method, as long as can be formed by curing Quantum dot composite material.In a kind of preferred embodiment of the present invention, above-mentioned curing agent include radical UV curing agent and The step of thermal curing agents, above-mentioned solidification includes:Pair the first progress photocuring, is cured under the action of radical UV curing agent Semi-finished product;Heat cure is carried out to solidification semi-finished product under the action of thermal curing agents, obtains quantum dot composite material.
Above preferred embodiment by using radical UV curing agent and thermal curing agents to contain quantum dot and crosslinking agent with And the first mixture of additive carries out step curing, obtains quantum dot composite material.Above-mentioned radical UV curing agent is selected from 1- Hydroxycyclohexylphenylketone (photoinitiator 184), 2- methyl-1s-[4- methyl mercaptos phenyl] -2- morpholinyl -1- acetone are (light-initiated Agent 907), 2- hydroxy-methyl phenyl-propane -1- ketone (photoinitiator 1173), 2,4,6- trimethylbenzoy-diphenies oxidation Bis- (2,4, the 6- trimethylbenzoyl) phosphine oxides (photoinitiator 819) of phosphine (photoinitiator TPO), phenyl, 2- phenyl benzyls -2- two Methyl amine -1- [4- morpholine benzyls phenyl]-butanone (photoinitiator 369), α, alpha, alpha-dimethyl oxygroup-α-phenyl acetophenone (photoinitiator 651), any one or a few in benzophenone (photoinitiator b P) and methyl benzoylformate (photoinitiator MBF).Heat Curing agent is selected from ethylenediamine, diethylenetriamine, polyethylene polyamine, dipropylenetriamine, m-phenylene diamine (MPD), two amido diphenyl sulfones, hydroxyl Ethylethylenediamine, benzophenone tetracarboxylic dianhydride, tetrabydrophthalic anhydride, glutaric anhydride, methylhexahydrophthalic anhydride, equal benzene Any one or a few in tetracarboxylic acid anhydride, 2-methylimidazole and 2- ethyl imidazol(e)s.Work of the esters of acrylic acid in light curing agent Semi-solid preparation product are formed with lower cross-linking reaction, then, cures after being carried out to epoxy resin by thermal curing agents, system can be effectively improved The degree of cross linking.Different curing agent, which are used in compounding, can realize curing rate soon and curing efficiency height and condensate performance is excellent consolidates Change effect.
The solidification process of above-mentioned quantum dot composite material such as Fig. 1 (a)-Fig. 1 (b)-Fig. 1 (c) and Fig. 2 (a)-Fig. 2 (b)-Fig. 2 (c) shown in.Wherein, Fig. 1 (a) to Fig. 1 (c) respectively illustrates epoxy novolac-acrylate block copolymer and forms lamellar phase point Before curing when from structure after (a), photocuring after (b) and heat or photocuring (c) microcosmic chain form schematic diagram.
As shown in Fig. 1 (a), before solidification, novolac epoxy resin block 30 is arranged in side, and arylate blocks 40 are arranged in The other side;Under the action of photocuring, as shown in Fig. 1 (b), using acrylic monomers 50 as crosslinking agent, arylate blocks 40 It is first cured to form arylate blocks cured layer 80;Then as shown in Fig. 1 (c), using epoxy monomer 60 as crosslinking agent, phenol Formaldehyde epoxy resin block 30 forms novolac epoxy resin block cured layer 90 under the action of heat cure or photocuring.And work as x= When 1, y=5, epoxy novolac-acrylate block copolymer then forms spherical phase separation structure.As shown in Fig. 2 (a), acrylic acid Ester block 40 flocks together to form spherical center since segment is shorter, and novolac epoxy resin block 30 is then arranged in outside, Arylate blocks 40 are formed and surround shape.Quantum dot (including green quantum dot 10 and red quantum dot 20) due to acrylic acid The compatibility of ester block 40 is preferable, is preferentially dispersed in arylate blocks 40.After radical UV curing, as shown in Fig. 2 (b), Arylate blocks 40 are first cured to be formed around green quantum dot 10 and amount of red using acrylic monomers 50 as crosslinking agent First shell 100 of son point 20, then under the action of heat cure or photocuring, as shown in Fig. 2 (c), novolac epoxy resin is embedding Section 30 is formed by curing in the periphery of the first shell 100 using epoxy monomer 60 as crosslinking agent, is formed the second shell 110.
In another preferred embodiment of the invention, above-mentioned curing agent includes that radical UV curing agent and cationic photopolymerization are solid The step of agent, above-mentioned solidification includes:It is mixed to first under being acted on while radical UV curing agent and cation photocuring agent It closes object to be cured, obtains quantum dot composite material.The preferred embodiment uses free radical and cation photocuring agent, by same When pair the first mixture carry out a UV irradiations solidification process can be completed, obtain quantum dot composite material.
In above-mentioned curing schedule, the solidification of novolac epoxy resin block 30 is to realize that light is solid by cation photocuring agent Change.It is added radical UV curing agent and cation photocuring agent in epoxy novolac-acrylate block copolymer, when solidification is selected 365nm UV lamps (and 450nm blue-ray lights are simultaneously) irradiation is selected, can ensure that the free radical of acrylic acid causes (365nm) and ring in this way The cation of oxygen groups causes (ultraviolet 365nm and blue light 450nm can) and is carried out at the same time.Moreover, because free radical causes speed Degree is more faster than cationic curing, and the state initially formed is equally as shown in Fig. 1 (b) and Fig. 2 (b), and only double bond is partial cross-linked, Epoxy group is still in free state;And after curing after the cation of certain time, what end-state and heat cure were formed Fig. 1 (c) is consistent with Fig. 2 (c), and epoxy group is successfully crosslinked.The advantages of radical UV curing is quick solidifying, the disadvantage is that volume contraction Rate is big;And the advantages of cation photocuring is that cubical contraction is small, the disadvantage is that slow curing is (all than heat cure, radical UV curing Slowly), but above-mentioned curing not only takes full advantage of its advantage, but also has adapted to successively cured demand using its disadvantage, Save irradiation time simultaneously.
In a kind of more specifical embodiment, in the different solidification process of above two, the light source of UV irradiations is 365nm LED cold light sources or it is metal halogen lamp source centered on 365nm or mercury lamp light source or is centered on 450nm Visible light source.
In another typical embodiment of the invention, a kind of quantum dot composite material is additionally provided, the quantum dot is multiple Condensation material is prepared using any of the above-described kind of preparation method.Had using the quantum dot composite material that the above method is prepared Compatibility and barrier property are superior, and luminous efficiency is high, the good advantageous effect of stability of photoluminescence.
In another typical embodiment of the invention, a kind of quantum dot composite material is additionally provided, the quantum dot is multiple Condensation material includes quantum dot and the macromolecule matrix solidfied material being coated on around quantum dot, which is phenolic aldehyde Cross-linking products between epoxy-acrylic ester block copolymer, the cross-linking products have the structural unit as shown in following formula (I):
Quantum dot composite material with above structure unit can be embedding according to novolac epoxy resin block and acrylate The length of section can form different phase separation structures.When novolac epoxy resin block and arylate blocks approximately equal, phenol Aldehyde epoxy-acrylic ester block copolymer forming layer shape phase separation structure, as shown in Fig. 1 (a) to Fig. 1 (c), novolac epoxy resin 40 rule of block 30 and arylate blocks is arranged in layer structure, and novolac epoxy resin block 30 is arranged in side, propylene Acid esters block 40 is arranged in the other side, and novolac epoxy resin block cured layer 90 is respectively formed after solidification and arylate blocks are solid Change layer 80.And when arylate blocks 40 are much smaller than novolac epoxy resin block 30, epoxy novolac-acrylic ester block Object then forms spherical phase separation structure, and as shown in Fig. 2 (a) to Fig. 2 (c), arylate blocks 40 are gathered in since segment is shorter Spherical center is formed together, and novolac epoxy resin block 30 is then arranged in outside, is formed to arylate blocks 40 and surrounds shape. Quantum dot is preferentially dispersed in arylate blocks 40 due to preferable with the compatibility of arylate blocks 40.Acrylate is embedding Section 40 is solidificated in internal layer and forms the first shell 100 around green quantum dot 10 and red quantum dot 20, and novolac epoxy resin is embedding Section 30 is then formed by curing the second shell 110 around green quantum dot 10 and red quantum dot 20 in outer layer, to be formed to measure Nucleocapsid centered on son point.
Structural unit in above-mentioned quantum dot composite material refers to constituting macromolecular chain and determining macromolecular structure with certain The atom combination that mode connects.Multiple "-" of above structure cell end represent half after double bond or epoxy bond are opened Chemical bond, arbitrary half in the structural unit that arbitrary half of chemical bond in each above structure unit can be adjacent thereto Chemical bond is attached to form complete chemical bond.Arbitrary half of chemical bond of every half of chemical bond and another structural unit connects It connects, just forms the macromolecule matrix solidfied material of reticular structure in this way.The macromolecule matrix solidfied material of reticular structure surrounds center Quantum dot just form above-mentioned quantum dot composite material.
In another typical embodiment of the invention, a kind of quantum dot light emitting device, quantum dot hair are additionally provided Optical device includes quantum dot composite material, and quantum dot composite material is above-mentioned quantum dot composite material.Including above-mentioned quantum dot is multiple The quantum dot light emitting device of condensation material has the advantages that luminous efficiency is high and stability is good.
In quantum dot composite material contained by above-mentioned quantum dot light emitting device, the specific luminescent color of quantum dot can basis Practical luminescent device is reasonably selected.In a kind of preferred embodiment of the present invention, quantum dot be red quantum dot and Green quantum dot.Red quantum dot and green quantum dot can be used in display field, red under the irradiation of blue led backlight Blue light can be absorbed with green quantum dot and converts thereof into red and green light, and it is white to form RGB with unabsorbed blue light Light field.Due to the half-peak width of red and green quantum dot, compared with traditional liquid crystal display, quantum dot shows that colour gamut is high, face Color saturation is high.
Above-mentioned quantum dot light emitting device can be quantum dot film or quantum dot pipe according to actual needs.Quantum dot composition exists Film-forming can form quantum dot film on carrier.In concrete application environment, the upper layer of quantum dot film or lower layer can be with There are the Obstruct membrane or protective film that polymer film is formed, or there can also be other among quantum dot film and polymer film Layer.Quantum dot composition cures in the cavity of pipeline forms quantum dot pipe, and quantum dot pipe is to place quantum dot composition It is then sealed to solidification in tubular container, is used for the light-switching device of display backlight system.
Advantageous effect to further illustrate the present invention below in conjunction with specific embodiments.
Embodiment 1
Using epoxy novolac-acrylate block copolymer as macromolecule matrix solidfied material precursor, by macromolecule matrix Solidfied material precursor, crosslinking agent and curing agent obtain the first mixture;First mixture is cured, it is multiple to obtain quantum dot Condensation material, each specific reactant of step is raw materials used to be shown in Table 1, and when specific reaction condition is shown in Table 2 to the dosage between each raw material.
Embodiment 2
Embodiment 2 uses epoxy novolac-acrylate block copolymer as macromolecule matrix solidfied material precursor, by high score Subbase body solidfied material precursor, crosslinking agent, curing agent and additive, obtain the first mixture;First mixture is consolidated Change, obtains quantum dot composite material, each specific reactant of step is raw materials used to be shown in Table 1, and the dosage between each raw material is when specific Reaction condition is shown in Table 2.
Embodiment 3-10
Embodiment 3-10 uses the step identical as embodiment 1 or 2, using preparation parameter shown in Tables 1 and 2 and condition It is prepared.
Comparative example 1
Using polyacrylate as macromolecule matrix solidfied material precursor, other parameters condition is shown in Tables 1 and 2.
Comparative example 2
Using bisphenol A epoxide resin as macromolecule matrix solidfied material precursor, other parameters condition is shown in Tables 1 and 2.
Comparative example 3
Using the mixture of acrylate and epoxy resin as macromolecule matrix solidfied material precursor, other parameters condition is shown in Tables 1 and 2.
Table 1:Each raw materials used type of embodiment and comparative example
Table 2:The preparation condition of each embodiment and comparative example
Detection:The performance of quantum dot composite material prepared by the various embodiments described above and comparative example is detected, is detected It the results are shown in Table 3 and table 4.
The detection method of quantum dot light emitting efficiency is:Using 450nm blue LED lamps as backlight spectra, integrating sphere is utilized Blue backlight spectrum and the spectrum through quantum dot composite material are tested respectively, and calculating quantum dot using the integral area of spectrogram sends out Light efficiency.
Quantum dot light emitting efficiency=(red quantum dot absorbs peak area+green quantum dot peak absorption area)/(Blue backlight Peak area-is through the unabsorbed blue peak area of quantum dot composite material) * 100%.
The test method of stability of photoluminescence includes mainly:The illumination of high temperature blue light (70 DEG C, 0.5W/cm2), high temperature and humidity (65 DEG C/95%RH) under the aging conditions such as high-temperature storage (85 DEG C), detect the efficiency change and invalid edges of quantum dot composite material Size.
Table 3:
Note:The above efficiency is relative efficiency, the efficiency of comparative example 1 is set to 100%, other efficiency correspond in proportion.
Table 4:
Note:The above invalid edges are after making quantum dot film, by determining the size of edge invalid edges, quantum dot under microscope The size of film is 6cm*6cm.
From table 3 and table 4 as can be seen that arylate blocks are more, start efficiency is higher, and aging attenuation amplitude is bigger, black Bian Yue great;Conversely, epoxy block is more, start efficiency is lower, and aging attenuation amplitude is smaller, and black surround is smaller.Embodiment 1-10 with Comparative example 1 is compared, and initial light emission efficiency is not much different with comparative example 1, but luminous efficiency attenuation amplitude (passes through formula:Decaying width Degree=(aging behind efficiency-starting efficiency)/starting efficiency x 100% is calculated) it is substantially reduced compared with comparative example 1, stable luminescence Property greatly enhances.For embodiment 1-10 compared with comparative example 2, initial light emission efficiency is far above comparative example 2, and luminous efficiency decaying width Degree is not much different with comparative example 2.Compared with comparative example 3, embodiment 1-10, which is used, contains novolac epoxy resin block and acrylic acid The block copolymer of ester block, the macromolecule matrix solidfied material precursor formed in a manner of being keyed by chemistry surround quantum The luminescent material that point is formed, compared with the quanta point material that acrylate and epoxy resin using physical blending are formed, Not only have higher luminous efficiency, and after aging luminous efficiency attenuation amplitude it is small, the size of invalid edges is also relatively small, The stability of luminous efficiency is stronger.
It can be seen from the above description that the above embodiments of the present invention realize following technique effect:Pass through selection Include macromolecule matrix solidfied material precursor of the novolac epoxy resin-acrylic block copolymers as dispersion quantum dot, due to phenol Formaldehyde epoxy resin-acrylic block copolymers combine that acrylate and quantum dot compatibility be good and epoxy resin to oxygen and The advantages of aqueous vapor good barrier property, have it is amphipathic, to setting about from macromolecule matrix solidfied material precursor material composition in terms of, solution The problem of compatibility and starvation and aqueous vapor with quantum dot, improves the luminous efficiency of quantum dot composite material and steady It is qualitative.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any made by repair Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.

Claims (20)

1. a kind of quantum dot composition, which is characterized in that the quantum dot composition includes quantum dot and macromolecule matrix solidification Object precursor further includes crosslinking agent and curing agent in the quantum dot composition, and the macromolecule matrix solidfied material precursor includes phenol Aldehyde epoxy-acrylic ester block copolymer.
2. quantum dot composition according to claim 1, which is characterized in that the epoxy novolac-arylate blocks are total Polymers is epoxy novolac-acrylate block copolymer of following structural formula:
Wherein, x, y are integer, and x >=1, y >=1, and 3≤x+y≤7.
3. quantum dot composition according to claim 1, which is characterized in that the crosslinking agent is double/three-functionality-degree propylene Acid monomers and/or double/three-functionality-degree epoxy monomer.
4. quantum dot composition according to claim 3, which is characterized in that described double/three-functionality-degree acrylic monomers and/ Or the mass ratio of double/three-functionality-degree epoxy monomer and the epoxy novolac-acrylate block copolymer is 1~3:10~20.
5. quantum dot composition according to claim 1, which is characterized in that the curing agent be radical UV curing agent and Thermal curing agents, or be radical UV curing agent and cation photocuring agent.
6. quantum dot composition according to claim 1, which is characterized in that the quantum dot composition further includes addition Agent.
7. quantum dot composition according to claim 6, which is characterized in that the additive be light diffusion particle and/or Antioxidant.
8. a kind of preparation method of quantum dot composite material, which is characterized in that the preparation method includes:
Macromolecule matrix solidfied material precursor, crosslinking agent, curing agent, quantum dot and optional additive are mixed to get first to mix Close object;
First mixture is cured, the quantum dot composite material is obtained;
Wherein, the macromolecule matrix solidfied material precursor includes epoxy novolac-acrylate block copolymer.
9. preparation method according to claim 8, which is characterized in that the epoxy novolac-acrylate block copolymer Structural formula be:Wherein, x, y are integer, and X >=1, y >=1, and 3≤x+y≤7.
10. preparation method according to claim 8, which is characterized in that the crosslinking agent be bifunctionality acrylic monomers, Three-functionality-degree acrylic monomers, bifunctionality epoxy monomer and/or three-functionality-degree epoxy monomer.
11. preparation method according to claim 8, which is characterized in that the crosslinking agent and the epoxy novolac-acrylic acid The mass ratio of ester block copolymer is 1~3:10~20.
12. preparation method according to claim 8, which is characterized in that the curing agent is radical UV curing agent and heat Curing agent.
13. preparation method according to claim 12, which is characterized in that the step of solidification includes:
Photocuring is carried out to first mixture using the radical UV curing agent, obtains solidification semi-finished product;
Heat cure is carried out to the solidification semi-finished product using thermal curing agents, obtains the quantum dot composite material.
14. preparation method according to claim 8, which is characterized in that the curing agent is radical UV curing agent and sun The step of ion light curing agent, the solidification includes:
First mixture is cured under being acted on while radical UV curing agent and cation photocuring agent, is obtained The quantum dot composite material.
15. preparation method according to claim 8, which is characterized in that the additive is light diffusion particle and/or antioxygen Agent.
16. a kind of quantum dot composite material, which is characterized in that the quantum dot composite material, which uses in claim 8 to 15, appoints Preparation method described in one is prepared.
17. a kind of quantum dot composite material, which is characterized in that the quantum dot composite material includes quantum dot and is coated on described Macromolecule matrix solidfied material around quantum dot, the macromolecule matrix solidfied material are epoxy novolac-acrylic ester block Cross-linking products between object, the cross-linking products have the structural unit as shown in following formula (I):
18. a kind of quantum dot light emitting device, including quantum dot composite material, which is characterized in that the quantum dot composite material is Quantum dot composite material described in claim 17.
19. quantum dot light emitting device according to claim 18, which is characterized in that the amount in the quantum dot composite material Son point is red quantum dot and/or green quantum dot.
20. quantum dot light emitting device according to claim 18, which is characterized in that the quantum dot light emitting device is quantum Point film or quantum dot pipe.
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