Summary of the invention
The technical problem to be solved by the present invention is in view of the deficienciess of the prior art, providing a kind of quantum of high colour gamutPoint film, the quantum dot film not only have high colour gamut but also can improve quantum dot film luminous efficiency stability, and brightness declines with colour gamutSubtract and substantially reduce, colour gamut NTSC can reach 95%~110%.
Solve technical solution used by above-mentioned technical problem are as follows:
A kind of quantum dot film, including quantum dot core layer, the upper oxygen barrier encapsulated layer of water proof and the lower oxygen barrier encapsulated layer of water proof, instituteStating quantum dot core layer includes following component:
Matrix adhesive, 80 parts by weight~110 parts by weight,
Quantum dot, 0.6 parts by weight~4.4 parts by weight,
Quantum dot microcapsules, 4.5 parts by weight~33 parts by weight,
Diffusion particle, 1 parts by weight~15 parts by weight.
The quantum dot microcapsules include red quantum dot microcapsules and green quantum dot microcapsules, by capsule-core and cyst wall groupAt the capsule-core of red quantum dot microcapsules is the particle with micropore for being adsorbed with red quantum dot, the capsule-core of green quantum dot microcapsulesFor the particle with micropore for being adsorbed with green quantum dot.
Above-mentioned quantum dot film, the particle are one or more of organic or inorganic particle composition, preferably PMMA with haveMachine silicon particle.
Above-mentioned quantum dot film, the diameter of particle are 0.5 μm~35 μm, and the aperture of micropore is 10nm~40nm, microporeDepth is the nm of 5nm~20, and the shape of micropore is cylindrical, conical, polygonal or anomocytic type.
Above-mentioned quantum dot film, the diameter of particle are 1.5 μm~20 μm, and the aperture of micropore is 12nm~30nm, microporeDepth is the nm of 6nm~15.
Above-mentioned quantum dot film, the partial size of the quantum dot microcapsules are 1 μm~40 μm, preferably 2 μm~25 μm.
Above-mentioned quantum dot film, the cyst wall are obtained after heat cure or UV solidify by adhesive compound, adhesive choosingOne or both of self-polystyrene resin, polymethyl methacrylate, acrylic resin, polyurethane resin, epoxy resinAbove combination.
Above-mentioned quantum dot film, the adhesive compound are also added with levelling agent, light curing agent, in crosslinking agent and solventIt is one or more of.
Above-mentioned quantum dot film, the refringence between the quantum dot microcapsules and matrix adhesive are more than or equal to 0.005,Refringence between diffusion particle in core layer and matrix adhesive is more than or equal to 0.005.
Above-mentioned quantum dot film, the diameter of the diffusion particle are 0.1 μm~20 μm, and preferably l μm~15 μm, quantum dot film is totalWith a thickness of 25 μm~500 μm.
Quantum dot optical film of the present invention is used for preparing backlight module, technical solution are as follows:
A kind of backlight module, including light source, light guide plate, prismatic lens further include quantum dot optical film as described above, describedQuantum dot optical film is between light guide plate and prismatic lens.
Compared with prior art, the invention has the following advantages that
The present invention due to joined while red green quantum dot is added the stable red quantum dot microcapsules of luminous efficiency,Green quantum dot microcapsules, capsule can protect quantum dot, prevent quantum dot quenching, improve quantum dot film water proof oxygen barrier, raising amountThe stability of photoluminescence of son point, stablizes quantum dot luminous efficiency.Quantum dot microcapsules are used cooperatively with quantum dot, so that quantum dot filmColour gamut it is high, NTSC can reach 95%~110%.
Specific embodiment
Quantum dot film of the invention includes quantum dot core layer, the oxygen barrier encapsulated layer of upper and lower water proof.The quantum dot core layerIt is made of matrix adhesive and several quantum dot microcapsules, diffusion particles being dispersed in matrix adhesive.Matrix gluingAgent, 80 parts by weight~110 parts by weight, quantum dot, 0.6 parts by weight~4.4 parts by weight, quantum dot microcapsules, 4.5 parts by weight~33Parts by weight, diffusion particle, 1 parts by weight~15 parts by weight.Quantum dot microcapsules include that red quantum dot microcapsules and green quantum dot are micro-Capsule, quantum dot microcapsules are made of capsule-core and cyst wall, and the capsule-core is respectively to be adsorbed with red quantum dot or green quantum dotParticle with micropore.
For the luminous efficiency for stablizing red green quantum dot, the present invention uses quantum dot microcapsules, quantum dot is dispersed in porousIn the micropore of the organic or inorganic particle of structure, quantum dot capsule-core is formed, is wrapped up outside quantum dot capsule-core by cyst wall, the cyst wall amount of beingSon point protective layer, i.e., quantum dot capsule-core is encapsulated, which prevent steam in the quantum dot and air on capsule-core or itsThe contact of its gas, while reducing quantum dot and being quenched with quantum dot caused by the contact of basis material resin or various auxiliary agents.Small porous particle is generally organic or inorganic material, and heat-resisting solvent resistance is stablized, and quantum dot obtains in the micropore of small porous particlePreferably protection, stability also greatly improve.
The capsule-core is one or more of the organic or inorganic particle that surface has porous structure composition described above, preferablyPMMA and organosilicon, partial size are 0.5 μm~35 μm, and the aperture of micropore is 10 nm~40nm, and the aperture depth of micropore is 5 nm~20 nm.Diameter of particle gets over that bigger serface is smaller, therefore the aperture of diameter of particle and micropore will increase on unit area greatly very muchQuantum dot dosage is unfavorable for reducing cost.The shape in the hole of porous granule is cylindrical, conical, polygonal or anomocytic type.
Preferably, the partial size of the particle is 1.5 μm~20 μm, and the aperture of micropore is 12 nm~30nm, and micropore size is deepDegree is 6 nm~15nm.
Quantum dot capsule-core the preparation method is as follows:
The particle with micropore is separately added into certain density red quantum dot solution and green quantum dot solution first, intoRow adequately mixing dispersion, according to xenogenesis coherent function method, red quantum dot can be adsorbed on the surface bee of above-mentioned particle with green quantum dotIn nest shape is porous, drying makes solvent volatilize, in the present invention by this diffusion for having adsorbed a large amount of red quantum dots or green quantum dotParticle is referred to as red quantum dot capsule-core or green quantum dot capsule-core.
In order to improve the stability of quantum dot light emitting efficiency, the present invention is to the above-mentioned particle for being adsorbed with quantum dot --- quantumPoint capsule-core is encapsulated, and encapsulating material is referred to as cyst wall.Cyst wall is also the protective layer of quantum dot, avoid quantum dot it is exposed outside with skyGas or water contact, while reducing quantum dot and quantum dot caused by the contact of basis material resin or in which various auxiliary agents is suddenIt goes out, various auxiliary agents include: levelling agent, light curing agent, crosslinking agent, solvent etc..Quantum dot is dispersed in particle micropore and passes throughAfter being encapsulated, avoid quantum dot in air steam or other gases contact caused by performance degradation, improve quantum dotStability and luminous efficiency claim respectively by the organic or inorganic quantum dot diffusion particle for being adsorbed with red or green quantum dot being encapsulatedMake red or green quantum dot microcapsules, details are as follows for preparation method:
Capsule wall solution of the configuration with certain viscosity, capsule wall solution can be heat cure or UV cured adhesive, glue firstStick is selected from one of polystyrene resin, polymethyl methacrylate, acrylic resin, polyurethane resin, epoxy resinOr at least two combination.Preferred polyester resin and polyurethane resin adhesive.The production simplest embodiment of cyst wall is benefitWith air suspension, that is, use the air blast of fluidized bed that capsule-core particle suspension in air, will be made into proper viscosity by nozzleCyst wall adhesive solvent be sprayed at microparticle surfaces, if cyst material select hot setting adhesive, improving gas flow temperature makes capsuleSolvent volatilization in wall solution, being formed has certain thickness cyst wall.If cyst material selects UV cured adhesive, gas is improvedStream temperature makes the solvent in capsule wall solution volatilize, then carries out well known UV curing mode and form cyst wall.The thickness of cyst wall can lead toThe extrusion output of adjustment nozzle is crossed to control.Wall thickness is 0.5 μm~5 μm, when wall thickness is less than 0.5 μm, is easy broken wall, amountSon point cannot be protected；It can reduce the luminance of quantum dot film when greater than 5 μm, preferably 1 μm~2 μm.Finally formed quantum dot is micro-1.0 μm~40 μm of capsule grain diameter.
Production cyst wall is also not excluded for the preparation method using other microcapsules, such as physical-chemical process, chemical method.
In addition to this, lower on core layers to increase the oxygen barrier encapsulated layer of water proof, also function to the mesh of stable quantum dot luminous efficiency's.Protective layer water vapor transmittance is preferably 0.l~10-6mg/m2.day, more preferably 10-2~10-5mg/m2 m2.day, oxygenPreferred 0.l~10 of transmitance-6mg/ m2.day, more preferably 10-2~10-5mg/ m2.day。
Matrix adhesive in quantum dot core layer can select well known crylic acid resin, polyurethanes, polyester, thirdOne or more of olefin(e) acid polyalcohols composition described above, curing mode are solidified using heat cure or UV, further preferably poly-Urethane and polyester resin.
Diffusion particle in quantum dot core layer is the particle that spherical or elliposoidal etc. has light diffusion function, can be singleOne particle size dispersion or the mixing dispersion of a variety of partial sizes, the diameter of diffusion particle are 0.1 μm~20 μm, preferably l μm~15 μm.
Light diffusion particle material in quantum dot core layer can select well known organic silicon, PS, PMMA, PBMA,TiO2, CaCO3, AI203, one or more kinds of compositions of BaSO4, nylon etc., further preferably PMMA and organic siliconOne or more kinds of combinations.
Refringence between the quantum dot microcapsules and matrix adhesive is more than or equal to 0.005, in core layerRefringence between diffusion particle and matrix adhesive is more than or equal to 0.005.Quantum dot microcapsules and diffusion particle are to entranceIncident ray in matrix is scattered refraction, increases light path of the light by quantum dot layer, improves the luminous efficiency of quantum dot,Refractive index difference is bigger, and the angle that refraction scattering occurs for light is bigger.
The red green quanta point material, in the first compound formed including the element in Section II main group and Section VI main groupAny one, including CdSe, CdTe, MgS, MgSe, MgTe, CaS, CaSe, CaTe, SrS, SrSe, SrTe, BaS, BaSe,BaTe, ZnS, ZnSe, ZnTe and CdS；It is any one in the second compound that Section III main group is formed with the element in V main groupKind, including GaN, GaP, GaAs, InN, InP and InAs；It is a variety of in first compound and/or the second compoundThe core-shell structure compound or Doped nanocrystal formed is coated, the diameter of the quantum dot is 1 nm~10nm, further excellentThe particle size range for selecting red light quantum point is 6 nm~9nm, and the particle size range of the green light quantum point is 2 nm~5nm.
The quantum dot core layer, by the red quantum dot microcapsules of addition different proportion and green quantum dot microcapsules and notRed green quantum dot in proportion, to meet different user to the chromaticity requirements of quantum dot film.
Red green quantum dot weight ratio, red green quantum dot microcapsules weight ratio in the quantum dot core layer are1:2~1:15, further preferred 1:5~1:10.
The quantum dot core layer with a thickness of 2 μm~300 μm, preferably 3 μm~200 μm.
The surface of the quantum dot core layer is equipped with the oxygen barrier encapsulated layer of upper and lower water proof, and quantum dot core layer is coated on lower water proofOn oxygen barrier encapsulated layer, the upper and lower oxygen barrier encapsulated layer of water proof can contain the protective coating with antistatic and anti-stick function, orAntistatic agent or diffusion particle are added in the oxygen barrier encapsulated layer of water proof.Protective coating with a thickness of 2 μm~10 μm on the outside of encapsulated layer.
The oxygen barrier encapsulated layer of water proof of quantum dot core layer two sides is by obstructing with gas (such as vapor, oxygen)One or more layers film of ability is constituted, and including but not limited to PVA is coated with high-isolation film, polyvinylidene chloride film(PVDC), ethylene/vinyl alcohol copolymer, PET etc..Film thickness is less than 200 μm, preferably 20-100 μm.
The oxygen barrier encapsulated layer of upper water proof of the quantum dot core layer is bonded or is combined with each other with quantum dot core layer.
The invention also discloses a kind of backlight module, comprising: light source, light guide plate, prismatic lens and is made using the present inventionQuantum dot film, wherein quantum dot film be located on light guide plate, any position above and below prismatic lens.On quantum dot film of the inventionThe outside of the oxygen barrier encapsulating film of water proof, can be made the diffusion layer with prism structure, can be with light harvesting conversion, blast and diffusionIn one, the thickness of backlight module is reduced.
The preparation method of quantum dot film of the present invention, includes the following steps:
(1) diffusion particle is added in matrix resin adhesive, stirs evenly, continuously add the red quantum that step (2) obtainsPoint microcapsules and green quantum dot microcapsules simultaneously red green quantum dot is added, carry out adequately mixing dispersion, continuously add levelling agent,The additives such as curing agent are uniformly mixed, obtain quantum dot core layer coating fluid;
(2) the quantum dot core layer coating fluid that step (1) obtains is coated on to the upper surface of the oxygen barrier encapsulated layer of water proof.
(3) in the upper surface of quantum dot core layer bonding or the compound oxygen barrier encapsulated layer of upper water proof.Obtain quantum dot film.
Quantum dot film core layer coating fluid of the invention is applied by stick painting, blade coating, spraying, intaglio plate coating, dimple versionThe equipment such as cloth, item seam or slit are coated on the upper surface of the oxygen barrier encapsulated layer of lower water proof, by heat cure or the works such as UV solidification, drySkill forms.
Quantum dot film test brightness and colour gamut calculation method provided by the invention are as follows:
Luminance test: taking the quantum dot diaphragm of 14 cun of sizes, is placed in 14 cun of backlight modules, in the specified of 24VIt is lighted under voltage, measures its brightness and coloration with luminance meter (Suzhou Fu Shida scientific instrument Co., Ltd produces, model: BM-7)Coordinate.
It colour gamut test and calculates: taking the diaphragm of 14 cun of size, be placed in 14 cun of displays, instead of lower diffusion barrier,Display is adjusted to defined working condition, whole audience red, green, blue signal is input to display, with luminance meter (model:BM-7) the chromaticity coordinate of difference test center's point passes through well known set formula and calculates NTSC color gamut value.
The present invention will be described in more detail by the following examples.But these embodiments are not intended to limit the present invention, thisStructure that the technical staff in field is made according to these embodiments, method or transformation functionally are all contained in the present inventionProtection scope in.