Low-pressure-resistant quantum dot ink, preparation method thereof, color film, and display device

Abstract

The application provides a low-pressure-resistant quantum dot ink, a preparation method thereof, a color film, and a display device. The quantum dot ink is not easily volatilized in a low-pressure environment, resulting in a small film shrinkage and a flat color film. The quantum dot ink comprises: quantum dots and acrylate monomers. The quantum dots are surface-modified with organic ligands. The acrylate monomers include: acrylate monomers containing active polar groups and / or acrylate monomers with a saturated vapor pressure of less than 10 ‑3 mmHg acrylate monomer.

Description

Technical Field

[0001] The present application belongs to the field of display technology, and specifically relates to a low-pressure-resistant quantum dot ink and a preparation method thereof, a color film prepared from the quantum dot ink, and a display device. Background Art

[0002] Quantum dots, also known as semiconductor nanocrystals, have a particle size between 1 and 10 nm. Due to their quantum size effect and dielectric confinement, quantum dots possess unique photoluminescence (PL) and electroluminescence (EL) properties. Quantum dots exhibit excellent optical properties, including high quantum efficiency, high photochemical stability, resistance to photolysis, broad excitation, narrow emission, high color purity, and luminescence color that can be adjusted by controlling quantum dot size. They are widely used in light-emitting displays, photovoltaic devices, and the biological field. In the display field, quantum dot ink containing quantum dots is typically prepared, then inkjet printed and cured to form a color film (light conversion film). This can significantly improve the color gamut of displays and has garnered extensive research and development.

[0003] In the production process, after the inkjet printing panel, the printed film needs to be UV cured in an oxygen-free environment to form a color film. This often involves a process of entering a glove box through low-pressure ventilation or other low-pressure processes. Depending on the production process, the pressure can drop from atmospheric pressure to several Pa or even 10 -2 This will lead to more volatilization of printing ink, increased film shrinkage, and reduced surface flatness, which will greatly reduce the effect and have a great impact on the back-end packaging process, and even cause packaging failure.

[0004] In view of this, the present application provides a low-pressure-resistant quantum dot ink, a preparation method thereof, a color film and a display device. The quantum dot ink is not easy to volatilize under a low-pressure environment, so that the film shrinks small and the formed color film is flat. Summary of the Invention

[0005] The purpose of this application is to provide a low-pressure-resistant quantum dot ink and its preparation method, color film and display device. The quantum dot ink is not easy to volatilize under low-pressure environment, so that the film shrinks small and the formed color film is flat.

[0006] In a first aspect of the present application, a low-pressure-resistant quantum dot ink is provided, comprising: quantum dots and acrylate monomers, wherein the quantum dots are surface-modified with organic ligands, and the acrylate monomers comprise: acrylate monomers containing active polar groups, and / or acrylate monomers having a saturated vapor pressure of less than 10 -3 mmHg acrylate monomer.

[0007] In some embodiments, the active polar group includes at least one of a hydroxyl group, a carboxyl group, an amide group, and an amine group.

[0008] Furthermore, the active hydroxyl-containing acrylate monomer includes at least one of 3-(acryloyloxy)-2-hydroxypropyl methacrylate, 4-hydroxybutyl acrylate, 2-hydroxy-3-phenoxypropyl 2-acrylate, and 2-methyl-2-acrylate-2,3-dihydroxypropyl ester.

[0009] Furthermore, the active carboxyl-containing acrylate monomer includes: 2-methyl-acryloylethoxysuccinate.

[0010] Furthermore, the active amide group-containing acrylate monomer includes acrylamide or N-(3-dimethylaminopropyl)methacrylamide.

[0011] Furthermore, the active amino group-containing acrylate monomers include: 2-[[(butylamino)-carbonyl]oxy]ethyl 2-acrylate and 2-(2-oxo-1-imidazolidinyl)ethyl methacrylate.

[0012] In some embodiments, the mass percentage of the acrylate monomer containing an active polar group is 1-15 wt % based on the total weight of the quantum dot ink. Preferably, the mass percentage of the acrylate monomer containing an active polar group is 2-8 wt % based on the total weight of the quantum dot ink.

[0013] In some embodiments, the boiling point of the active polar group-containing acrylate monomer is ≥250°C.

[0014] In some embodiments, the acrylate monomer containing active polar groups is mixed with quantum dots with surface-modified organic ligands, and the active polar groups form hydrogen bonds with the organic ligands, so that the acrylate monomer containing active polar groups is connected to the quantum dots with surface-modified organic ligands.

[0015] Furthermore, the organic ligand comprises a plurality of repeating units, and the repeating units comprise at least one of an amino group, a phosphoric acid group, a polyether group, an epoxy group, a hydroxyl group, an amide group, a thiol group, and a carboxyl group.

[0016] Furthermore, based on the total weight of the quantum dot ink, the mass percentage of the surface-modified organic ligand quantum dots is 5-50 wt %. Preferably, based on the total weight of the quantum dot ink, the mass percentage of the surface-modified organic ligand quantum dots is 8-35 wt %.

[0017] Furthermore, based on the total weight of the quantum dots, the mass percentage of the organic ligand is 5-50 wt %. Preferably, based on the total weight of the quantum dots, the mass percentage of the organic ligand is 5-25 wt %.

[0018] In some embodiments, the acrylic acid ester monomer comprises: the saturated vapor pressure is less than 10 -3 mmHg acrylate monomer, with a boiling point ≥250°C.

[0019] Furthermore, the acrylate monomer having a saturated vapor pressure of less than 10-3 mmHg includes at least one of 1,10-decanediol diacrylate, tetraethylene glycol diacrylate, 3-(acryloyloxy)-2-hydroxypropyl methacrylate, 4-hydroxybutyl acrylate, 2-acrylate-2-hydroxy-3-phenoxypropyl ester, and 2-methyl-2-acrylate-2,3-dihydroxypropyl ester.

[0020] In some embodiments, the saturated vapor pressure is less than 10 based on the total weight of the quantum dot ink. -3 The mass percentage of the mmHg acrylate monomer is 10-90wt%. Preferably, the saturated vapor pressure is less than 10 -3 The mass percentage of the mmHg acrylate monomer is 20-80 wt %.

[0021] In some embodiments, the acrylic ester monomer further comprises: at least one of a monofunctional acrylic ester monomer, a difunctional acrylic ester monomer, a trifunctional acrylic ester monomer, and an oligomeric acrylic ester monomer.

[0022] In some embodiments, the quantum dot ink further includes a light diffuser, and the content of the light diffuser is no more than 10 wt %.

[0023] In some embodiments, the quantum dot ink further includes an initiator, and the content of the initiator is 1-5 wt %.

[0024] In a second aspect of the present application, a method for preparing a low-pressure-resistant quantum dot ink is provided, comprising the steps of: mixing quantum dots with acrylate monomers, wherein the quantum dots are surface-modified quantum dots with organic ligands, and the acrylate monomers comprise: acrylate monomers containing active polar groups, and / or acrylate monomers with a saturated vapor pressure of less than 10 -3 mmHg acrylate monomer; dispersed evenly to obtain the quantum dot ink as described above; under the condition of 25° C., the viscosity of the quantum dot ink is 2 to 20 mPa s, and the surface tension is 20 to 35 mN / m.

[0025] The third aspect of the present application provides a color film prepared from the above-mentioned quantum dot ink.

[0026] A fourth aspect of the present application provides a display device comprising the aforementioned color film. The display device of the present application can be any product or component with a display function, such as electronic paper, a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigation system, an in-vehicle display, an AR display, a VR display, and is particularly suitable for color display devices.

[0027] Compared with the prior art, the quantum dot ink and its preparation method of the present application have at least the following advantages:

[0028] (1) Acrylate monomers include: acrylate monomers containing active polar groups. When the acrylate monomers containing active polar groups are mixed with quantum dots with surface-modified organic ligands, the active polar groups and the organic ligands form hydrogen bonds. The hydrogen bonds have strong interaction forces, which allow the acrylate monomers containing active polar groups to connect and cross-link with the quantum dots with surface-modified organic ligands. Quantum dots are non-volatile inorganic substances, and the cross-linking effect of the acrylate monomers containing active polar groups with them reduces the volatility of the acrylate monomers, thereby reducing the film shrinkage and achieving high flatness of the formed color film, which is suitable for low-pressure environments.

[0029] (2) Acrylate monomers: saturated vapor pressure is less than 10 -3 mmHg acrylate monomer. When the boiling point is ≥250°C, the saturated vapor pressure of this acrylate monomer is low. It is resistant to low-pressure environments and has low volatility in low-pressure exhaust environments, resulting in small film shrinkage and high flatness of the formed color film, making it suitable for low-pressure environments.

[0030] (3) Acrylate monomers are: acrylate monomers containing active polar groups and saturated vapor pressure less than 10 -3 The combination of mmHg acrylic ester monomers has the above two functions, making the volatility of acrylic ester monomers low, thereby reducing film shrinkage and forming a color film with high flatness, which is suitable for low-pressure environments.

[0031] (4) The quantum dot ink of the present application has the ability to withstand low-pressure environments. When preparing the color film, the volatility of the acrylic monomer is low and the film shrinkage is small during the curing process of the color film, so the color film has high flatness. Its optical properties, such as total brightness, blue light absorption rate and light output efficiency, are also better. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Combined with the following Figure 1 When read together with the accompanying drawings, the above and other features of the present application will be more fully described. It should be understood that these drawings only depict several embodiments of the present application and should not be considered to limit the scope of the present application. The present application will be more clearly and detailed through the use of the accompanying drawings.

[0033] Figure 1 This is the film thickness diagram of the step profiler of Example 1 of the present application.

[0034] Figure 2 This is the step profiler film thickness diagram of Example 2 of this application.

[0035] Figure 3 This is the step profiler film thickness diagram of Example 3 of this application.

[0036] Figure 4 This is the step profiler film thickness diagram of Example 4 of this application.

[0037] Figure 5 This is the step profiler film thickness diagram of Example 5 of this application.

[0038] Figure 6 This is the step profiler film thickness diagram of Example 6 of this application.

[0039] Figure 7 This is the step profiler film thickness diagram of Example 7 of the present application.

[0040] Figure 8 This is the step profiler film thickness diagram of Example 8 of the present application.

[0041] Figure 9 This is the step profiler film thickness diagram of comparative example 1 of this application. DETAILED DESCRIPTION

[0042] The following examples are described to assist in understanding the present application, and the examples are not and should not be interpreted in any way as limiting the scope of protection of the present application.

[0043] As used herein, for example, "at least one of" when preceding or following a list of elements modifies the entire list of elements without modifying the individual elements of the list. If not otherwise defined, all terms (including technical and scientific terms) in the specification may be defined as those skilled in the art would normally understand. Terms defined in commonly used dictionaries should be interpreted as being consistent with their meanings in the context of the relevant art and the present disclosure, and should not be interpreted in an ideal manner or too broadly unless clearly defined. In addition, unless explicitly described to the contrary, the phrases "comprise" and "comprising" when used in this specification indicate the presence of the stated features, regions, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, regions, wholes, steps, operations, elements, components, and / or sets thereof. Therefore, the above phrases will be understood to mean including the stated elements, but not excluding any other elements.

[0044] In a first aspect of the present application, a low-pressure-resistant quantum dot ink is provided, comprising: quantum dots and acrylate monomers, wherein the quantum dots are surface-modified with organic ligands, and the acrylate monomers comprise: acrylate monomers containing active polar groups, and / or acrylate monomers having a saturated vapor pressure of less than 10 -3 mmHg acrylate monomer.

[0045] In some embodiments, the active polar group includes at least one of a hydroxyl group, a carboxyl group, an amide group, and an amine group.

[0046] The acrylate monomers containing active polar groups include: monofunctional acrylate monomers containing active polar groups, multifunctional acrylate monomers containing active polar groups, and oligoacrylate monomers containing active polar groups.

[0047] The active hydroxyl-containing acrylate monomer includes at least one of 3-(acryloyloxy)-2-hydroxypropyl methacrylate, 4-hydroxybutyl acrylate, 2-acrylate-2-hydroxy-3-phenoxypropyl ester, and 2-methyl-2-acrylate-2,3-dihydroxypropyl ester.

[0048] Reactive carboxyl-containing acrylate monomers include: 2-methyl-acryloylethoxysuccinate.

[0049] The reactive amide group-containing acrylate monomers include acrylamide or N-(3-dimethylaminopropyl)methacrylamide.

[0050] The reactive amino group-containing acrylate monomers include: 2-[[(butylamino)-carbonyl]oxy]ethyl 2-acrylate, or 2-(2-oxo-1-imidazolidinyl)ethyl methacrylate.

[0051] In some embodiments, the mass percentage of the acrylate monomer containing an active polar group is 1-15 wt % based on the total weight of the quantum dot ink. Preferably, the mass percentage of the acrylate monomer containing an active polar group is 2-8 wt % based on the total weight of the quantum dot ink.

[0052] In quantum dot inks, if the mass of the acrylate monomer containing active polar groups is too low, such as less than 1wt%, it will not significantly reduce the volatility of the quantum dot ink. If the mass of the acrylate monomer containing active polar groups is too high, such as greater than 15wt%, the polar groups form hydrogen bonds with the organic ligands, allowing the acrylate monomer containing active polar groups to connect to the quantum dots with surface-modified organic ligands. This will increase the viscosity of the quantum dot ink (the viscosity of the quantum dot ink needs to be between 2 and 20 mPa s), which is not conducive to inkjet printing.

[0053] In some embodiments, the boiling point of the active polar group-containing acrylate monomer is ≥250° C. This allows it to participate more in curing and film formation, and when inkjet printing is used, the quantum dot ink has better stability and less volatility.

[0054] In some embodiments, the acrylate monomer containing active polar groups is mixed with quantum dots with surface-modified organic ligands, and the active polar groups form hydrogen bonds with the organic ligands, so that the acrylate monomer containing active polar groups is connected to the quantum dots with surface-modified organic ligands.

[0055] In some embodiments, the organic ligand comprises a plurality of repeating units, each of which comprises at least one of an amino group, a phosphate group, a polyether group, an epoxy group, a hydroxyl group, an amide group, a thiol group, and a carboxyl group. Preferably, the number of the repeating units is 1 to 30.

[0056] The organic ligand comprises one of mercapto Tween 80, polyetheramine M-1000, alkylphenol polyoxyethylene ether phosphate group, phosphoric acid JTM9601, carboxyl Tween 80, and polyether silicone copolymer.

[0057] The surface of the quantum dots modified with organic ligands, on the one hand, the organic ligands make the quantum dots well dispersed in the acrylate monomers, and the quantum dots are evenly dispersed; on the other hand, the quantum dots modified with organic ligands are mixed with the acrylate monomers containing active polar groups, and the active polar groups form hydrogen bonds with the organic ligands. The hydrogen bonds have strong interaction forces, so that the acrylate monomers containing active polar groups are connected and cross-linked with the quantum dots modified with organic ligands. Quantum dots are non-volatile inorganic substances. The cross-linking effect of the acrylate monomers containing active polar groups with them reduces the volatility of the acrylate monomers, thereby reducing the film shrinkage and forming a color film with high flatness, which is suitable for low-pressure environments.

[0058] In some embodiments, the mass percentage of the surface-modified organic ligand quantum dots is 5-50 wt % based on the total weight of the quantum dot ink. Preferably, the mass percentage of the surface-modified organic ligand quantum dots is 8-35 wt % based on the total weight of the quantum dot ink.

[0059] In some embodiments, the weight percentage of the organic ligand is 5-50 wt % based on the total weight of the quantum dots. Preferably, the weight percentage of the organic ligand is 5-25 wt % based on the total weight of the quantum dots.

[0060] In some embodiments, the quantum dots comprise at least one of Group IIB-VIA, Group IIIA-VA, Group IVA-VIA, Group IVA, Group IB-IIIA-VIA, Group VIII-VIA, perovskite materials, and carbon quantum dots. For example, Group II-VI compounds may include: CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS, CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnT e. CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, MgZnSe, MgZnS, HgZnTeS, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe or combinations thereof. The III-V compounds may include GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, GaNPs, GaNAs, GaNSb, GaPAs, GaPSb, AlNPs, AlNAs, AlNSb, AlPAs, AlPSb, InNPs, InNAs, InNSb, InPAs, InPSb, InZnP, GaAlNPs, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNPs, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNPs, InAlNAs, InAlNSb, InAlPAs, InAlPSb, or combinations thereof. The perovskite quantum dots include organic perovskite quantum dots and / or inorganic perovskite quantum dots.

[0061] In some embodiments, the saturated vapor pressure is less than 10 -3 Acrylate monomer with a boiling point of ≥250°C.

[0062] The saturated vapor pressure is less than 10 -3 The acrylate monomer has a boiling point of ≥250°C, which can increase the stability of quantum dot ink during printing and reduce the volatilization loss of quantum dot ink.

[0063] In some embodiments, the saturated vapor pressure is less than 10 -3The acrylic acid ester monomer of mmHg includes at least one of 1,10-decanediol diacrylate, tetraethylene glycol diacrylate, 3-(acryloyloxy)-2-hydroxypropyl methacrylate, 4-hydroxybutyl acrylate, 2-hydroxy-3-phenoxypropyl 2-acrylate, and 2-methyl-2-acrylate-2,3-dihydroxypropyl ester.

[0064] In some embodiments, the saturated vapor pressure is less than 10 based on the total weight of the quantum dot ink. -3 The mass percentage of the acrylate monomer with a vapor pressure less than 10-3 mmHg is 10-90 wt %. Preferably, based on the total weight of the quantum dot ink, the mass percentage of the acrylate monomer with a vapor pressure less than 10-3 mmHg is 20-80 wt %.

[0065] Saturated vapor pressure is less than 10 -3 mmHg acrylate monomer, and when its boiling point is ≥250℃, the saturated vapor pressure is small, and it is resistant to low-pressure environment, ensuring low volatility in low-pressure exhaust environment, thereby making the film shrinkage small and the formed color film high in flatness, suitable for low-pressure environment.

[0066] In some embodiments, the acrylate monomer further comprises: at least one of a monofunctional acrylate monomer, a difunctional acrylate monomer, a trifunctional acrylate monomer, and an oligoacrylate monomer. Preferably, the monofunctional acrylate monomer is not used alone, but is mixed with at least one of a difunctional acrylate monomer, a trifunctional acrylate monomer, or an oligoacrylate monomer; whereas the difunctional acrylate monomer, a trifunctional acrylate monomer, or an oligoacrylate monomer can be used alone.

[0067] Monofunctional acrylate monomers include: methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, hexyl (meth)acrylate, octyl (meth)acrylate, nonyl (meth)acrylate, decyl (meth)acrylate, undecyl (meth)acrylate, dodecyl (meth)acrylate, cyclohexyl (meth)acrylate, dicyclopentyl (meth)acrylate, lauryl (meth)acrylate, benzyl (meth)acrylate or phenyl (meth)acrylate, dicyclopentyl (meth)acrylate ( at least one of HDCPMA), cyclohexyl (meth)acrylate, 4-tert-butylcyclohexyl (meth)acrylate, 3,3,5-trimethylcyclohexyl (meth)acrylate, isobornyl (meth)acrylate, 1-adamantane (meth)acrylate (AMA), 2-adamantane (meth)acrylate, isooctyl (meth)acrylate, isononyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, lauric (meth)acrylate (LMA), and stearic (meth)acrylate.

[0068] The difunctional acrylate monomer includes at least one of tripropylene glycol di(meth)acrylate, tetraethylene glycol dimethacrylate, dimethacrylic acid, 1,12-dodecanediol ester, 1,10-decanediol dimethacrylate, tricyclo[5.2.1.02,6]decanedimethanol acrylate or 1,6-hexanediol diacrylate.

[0069] The trifunctional acrylate monomer includes at least one of (ethoxylated) trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, dipentaerythritol tri(meth)acrylate and the like.

[0070] In some embodiments, the quantum dot ink further comprises a light diffuser, the content of which is no more than 10 wt %. The amount of the light diffuser is controlled to reduce the viscosity of the quantum dot composition and improve inkjet printing stability. The light diffuser of the present application is dispersed in the quantum dot ink to further enhance light extraction efficiency. The light diffuser particle size is 100 nm to 500 nm, and the weight percentage of the light diffuser is 0.1 to 10 wt %. The light diffuser includes an organic light diffuser and / or an inorganic light diffuser. The organic light diffuser includes at least one of silicone, polymethyl methacrylate, and polystyrene; the inorganic light diffuser includes at least one of nano-silicon oxide, nano-aluminum oxide, nano-titanium oxide, nano-zirconium oxide, nano-barium sulfate, nano-zinc sulfide, and nano-calcium carbonate; and the inorganic light diffuser has a certain blue light blocking and scattering effect.

[0071] In some embodiments, the quantum dot ink further includes an initiator, the initiator content of which is 1 to 5 wt %. The initiator includes a photoinitiator and a thermal initiator. The photoinitiator includes at least one of ethyl 2,4,6-trimethylbenzoylphenylphosphonate, 2-dimethylamino-2-benzyl-1-[4-(4-morpholinyl)phenyl]-1-butanone, 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone, methyl benzoylformate, 2,4-dihydroxybenzophenone, diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxide, and 5-nitroacenaphthene. The thermal initiator includes at least one of benzoyl peroxide, lauroyl peroxide, t-butyl perbenzoate, t-butyl pervalerate, azobisisobutyronitrile, and azobisisoheptonitrile.

[0072] In a second aspect of the present application, a method for preparing a low-pressure-resistant quantum dot ink is provided, comprising the steps of: mixing quantum dots with acrylate monomers, wherein the quantum dots are surface-modified quantum dots with organic ligands, and the acrylate monomers comprise: acrylate monomers containing active polar groups, and / or acrylate monomers with a saturated vapor pressure of less than 10 -3mmHg acrylate monomer; dispersed evenly to obtain the quantum dot ink as described above; under the condition of 25° C., the viscosity of the quantum dot ink is 2 to 20 mPa s, and the surface tension is 20 to 35 mN / m.

[0073] The quantum dot ink of the present application can be used to prepare color films by inkjet printing. At this time, the viscosity of the quantum dot ink is 2-20mPa s and the surface tension is 20-35mN / m, so that the quantum dot ink can be sprayed smoothly and stably.

[0074] The quantum dot ink of the present application can be used to prepare a color film by photolithography. At this time, the viscosity of the quantum dot ink is 10-20mPa s and the surface tension is 25-35mN / m to obtain a better light-emitting effect.

[0075] The quantum dot ink of the present application can be used to prepare a quantum dot enhancement film by a coating method. At this time, the pH value of the quantum dot ink is 6-10 and the viscosity is 10-2000mPa s to obtain a better light emission effect.

[0076] The third aspect of the present application provides a color film prepared from the above-mentioned quantum dot ink.

[0077] A fourth aspect of the present application provides a display device comprising the aforementioned color film. The display device of the present application can be any product or component with a display function, such as electronic paper, a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigation system, an in-vehicle display, an AR display, a VR display, and is particularly suitable for color display devices.

[0078] In addition to the color film, the display device may further include components known to those skilled in the art in the technical field of the present invention. That is, the present invention includes a display device including a color film that can be prepared using the quantum dot ink of the present invention.

[0079] The present invention will be further described in detail below with reference to specific examples and comparative examples, but the present invention is not limited to the following examples. The implementation conditions adopted in the examples can be further adjusted according to different requirements of specific use, and the conditions not specified are conventional conditions in the industry.

[0080] Example 1:

[0081] Preparation of quantum dot ink: Based on the total weight of the quantum dot ink, 20wt% of red light quantum dots (CdSe / ZnS, the organic ligand modified on the quantum dots is carboxyl Tween 80, which contains multiple carboxyl groups), 5wt% of light diffuser TiO2, 3wt% of photoinitiator TPO, 28wt% of dicyclopentyl methacrylate, 5wt% of 3-(acryloyloxy)-2-hydroxypropyl methacrylate (containing active hydroxy acrylate monomer), 35wt% of tripropylene glycol diacrylate and 4wt% of ethoxylated trimethylolpropane triacrylate are mixed evenly to obtain a quantum dot ink with a viscosity of 16mPas and a surface tension of 31mN / m.

[0082] Preparation of color film: Prepare a blank glass substrate with an area of ​​10cm*10cm, spin-coat photoresist, and photolithographically develop a rectangular (depth of about 12μm) pixel substrate. Then, inkjet print the above-mentioned quantum dot ink onto the rectangular pixel substrate. After passing through a low-pressure vacuum environment of 0.1Pa / 5min, UV curing and drying in an oxygen-free atmosphere under 4000mJ energy of ultraviolet light with a wavelength of 365nm is performed to obtain a color film.

[0083] Example 2:

[0084] Example 2 is substantially the same as Example 1, except that 5 wt % of 3-(acryloyloxy)-2-hydroxypropyl methacrylate in Example 1 is replaced with 5 wt % of 4-hydroxybutyl acrylate (containing an active hydroxyl acrylate monomer).

[0085] Example 3:

[0086] Example 3 is substantially the same as Example 1, except that 5 wt% of 3-(acryloyloxy)-2-hydroxypropyl methacrylate in Example 1 is replaced with 5 wt% of 2-acrylic acid-2-hydroxy-3-phenoxypropyl ester (containing an active hydroxyl acrylate monomer).

[0087] Example 4:

[0088] Example 4 is substantially the same as Example 1, except that the organic ligand carboxylic acid Tween 80 modified on the quantum dots in Example 1 is replaced with polyetheramine M-1000, which contains multiple amino groups.

[0089] Example 5:

[0090] Example 5 is substantially the same as Example 4, except that 5 wt% of 3-(acryloyloxy)-2-hydroxypropyl methacrylate in Example 4 is replaced with 5 wt% of 2-methyl-acryloylethoxysuccinate (containing an active carboxyl acrylate monomer).

[0091] Example 6:

[0092] Preparation of quantum dot ink: Based on the total weight of the quantum dot ink, 20wt% of red light quantum dots (CdSe / ZnS, the organic ligand modified on the quantum dots is carboxyl Tween 80), 5wt% of light diffuser TiO2, 3wt% of photoinitiator TPO, 38wt% of 1,10-decanediol diacrylate (low saturated vapor pressure), 30wt% of tetraethylene glycol diacrylate (low saturated vapor pressure) and 4wt% of ethoxylated trimethylolpropane triacrylate are mixed evenly to obtain a quantum dot ink with a viscosity of 14mPa s and a surface tension of 32mN / m.

[0093] Preparation of color film: Prepare a blank glass substrate with an area of ​​10cm*10cm, spin-coat photoresist, and photolithographically develop a rectangular (depth of about 12μm) pixel substrate. Then, inkjet print the above-mentioned quantum dot ink onto the rectangular pixel substrate. After passing through a low-pressure vacuum environment of 0.1Pa / 5min, UV curing and drying in an oxygen-free atmosphere under 4000mJ energy of ultraviolet light with a wavelength of 365nm is performed to obtain a color film.

[0094] Example 7:

[0095] Preparation of quantum dot ink: Based on the total weight of the quantum dot ink, 20wt% of red light quantum dots (CdSe / ZnS, the organic ligand modified on the quantum dots is carboxyl Tween 80), 5wt% of light diffuser TiO2, 3wt% of photoinitiator TPO, 26wt% of 1,10-decanediol diacrylate (low saturated vapor pressure), 5wt% of 3-(acryloyloxy)-2-hydroxypropyl methacrylate (hydroxyl acrylate monomer), 37wt% of tripropylene glycol diacrylate and 4wt% of ethoxylated trimethylolpropane triacrylate are mixed evenly to obtain a quantum dot ink with a viscosity of 16mPa s and a surface tension of 31mN / m.

[0096] Preparation of color film: Prepare a blank glass substrate with an area of ​​10cm*10cm, spin-coat photoresist, and photolithographically develop a rectangular (depth of about 12μm) pixel substrate. Then, inkjet print the above-mentioned quantum dot ink onto the rectangular pixel substrate. After passing through a low-pressure vacuum environment of 0.1Pa / 5min, UV curing and drying in an oxygen-free atmosphere under 4000mJ energy of ultraviolet light with a wavelength of 365nm is performed to obtain a color film.

[0097] Example 8:

[0098] Example 8 is substantially the same as Example 7, except that 37 wt % of tripropylene glycol diacrylate in Example 7 is replaced with 37 wt % of tetraethylene glycol diacrylate (low saturated vapor pressure).

[0099] Comparative Example 1:

[0100] Preparation of quantum dot ink: Based on the total weight of the quantum dot ink, 20wt% of red light quantum dots (CdSe / ZnS, the organic ligand modified on the quantum dots is carboxyl Tween 80), 5wt% of light diffuser TiO2, 3wt% of photoinitiator TPO, 33wt% of dicyclopentyl methacrylate, 35wt% of tripropylene glycol diacrylate, and 4wt% of ethoxylated trimethylolpropane triacrylate are mixed evenly. The viscosity of the obtained quantum dot ink is 15mPa s and the surface tension is 31mN / m.

[0101] Preparation of color film: Prepare a blank glass substrate with an area of ​​10cm*10cm, spin-coat photoresist, and photolithographically develop a rectangular (depth of about 12μm) pixel substrate. Then, inkjet print the above-mentioned quantum dot ink onto the rectangular pixel substrate. After passing through a low-pressure vacuum environment of 0.1Pa / 5min, UV curing and drying in an oxygen-free atmosphere under 4000mJ energy of ultraviolet light with a wavelength of 365nm is performed to obtain a color film.

[0102] The color films of Examples 1-8 and Comparative Example 1 were treated with a wavelength of 450 nm and a brightness of 1000 cd / m 2 The quantum dot photoluminescent film was illuminated with a blue backlight and tested for brightness and efficiency using a PR670 optical color analyzer. A step profiler was used to measure the height difference between the cured film and the pixel height, as well as the film thickness. The results are shown in Table 1.

[0103] Table 1: Statistics of the total brightness, light extraction efficiency, blue light absorption rate, and height difference between the cured film and the pixel.

[0104]

[0105] As can be seen from Table 1, the height difference (nm) between the cured film and the pixel in Examples 1 to 8 using the technical solution of the present application is significantly better than that in Comparative Example 1. Furthermore, compared to Comparative Example 1, the color film prepared using the technical solution of the present application exhibits low volatility of the acrylic monomer and minimal film shrinkage during the curing process, resulting in high flatness and superior optical performance (total brightness, blue light absorptivity, and light extraction efficiency).

[0106] Although this application has disclosed various aspects and embodiments, other aspects and embodiments will be readily apparent to those skilled in the art. Variations and modifications may be made without departing from the spirit of this application, and all such variations and modifications are within the scope of this application. The various aspects and embodiments disclosed in this application are provided for illustrative purposes only and are not intended to limit this application. The actual scope of this application is determined by the claims.

Claims

1. A low-pressure-resistant quantum dot ink, comprising: Quantum dots and acrylate monomers, characterized in that the quantum dots are surface-modified quantum dots with organic ligands, and the acrylate monomers include: acrylate monomers containing active polar groups, and / or acrylate monomers with a saturated vapor pressure of less than 10 -3 mmHg acrylate monomer; an acrylate monomer containing an active polar group is mixed with quantum dots with surface-modified organic ligands, wherein the active polar group forms a hydrogen bond with the organic ligand; the organic ligand comprises a plurality of repeating units, wherein the repeating units comprise at least one of an amino group, a phosphoric acid group, a polyether group, an epoxy group, a hydroxyl group, an amide group, a thiol group, and a carboxyl group; the active polar group comprises at least one of a hydroxyl group, a carboxyl group, an amide group, and an amine group; the saturated vapor pressure is less than 10 -3 mmHg acrylate monomer, with a boiling point ≥250°C.

2. The low-pressure-resistant quantum dot ink according to claim 1, wherein: The boiling point of the acrylic acid ester monomer containing active polar groups is ≥250°C.

3. The low-pressure-resistant quantum dot ink according to claim 2, wherein: The active hydroxyl group-containing acrylate monomers include: at least one of 3-(acryloyloxy)-2-hydroxypropyl methacrylate, 4-hydroxybutyl acrylate, 2-acrylate-2-hydroxy-3-phenoxypropyl ester, and 2-methyl-2-acrylate-2,3-dihydroxypropyl ester; the active carboxyl group-containing acrylate monomers include: 2-methyl-acryloylethoxysuccinate; the active amide group-containing acrylate monomers include: acrylamide, or N-(3-dimethylaminopropyl) methacrylamide; the active amino group-containing acrylate monomers include: 2-acrylate-2-[[(butylamino)-carbonyl]oxy]ethyl ester, or 2-(2-oxy-1-imidazolidinyl)ethyl methacrylate.

4. The low-pressure-resistant quantum dot ink according to claim 1, wherein The saturated vapor pressure is less than 10 - 3 The mmHg acrylate monomer includes at least one of 1,10-decanediol diacrylate, tetraethylene glycol diacrylate, 3-(acryloyloxy)-2-hydroxypropyl methacrylate, 4-hydroxybutyl acrylate, 2-hydroxy-3-phenoxypropyl 2-acrylate, and 2-methyl-2-acrylate-2,3-dihydroxypropyl ester.

5. The low-pressure-resistant quantum dot ink according to claim 1, wherein: comprising one or more features selected from the group consisting of: (1) Based on the total weight of the quantum dot ink, the mass percentage of the acrylate monomer containing an active polar group is 1-15wt%; (2) Based on the total weight of the quantum dot ink, the mass percentage of the surface-modified organic ligand quantum dots is 5-50wt%; (3) Based on the total weight of the quantum dots, the mass percentage of the organic ligand is 5-50 wt%; (4) Based on the total weight of the quantum dot ink, the saturated vapor pressure is less than 10 -3 The mass percentage of mmHg acrylate monomer is 10-90wt%.

6. A method for preparing low-pressure-resistant quantum dot ink, characterized in that: The method comprises the steps of: mixing quantum dots with acrylate monomers, wherein the quantum dots are surface-modified with organic ligands, and the acrylate monomers include: acrylate monomers containing active polar groups, and / or acrylate monomers with a saturated vapor pressure of less than 10 -3 mmHg acrylate monomer; an acrylate monomer containing an active polar group is mixed with quantum dots with surface-modified organic ligands, wherein the active polar group forms a hydrogen bond with the organic ligand; the organic ligand comprises a plurality of repeating units, wherein the repeating units comprise at least one of an amino group, a phosphoric acid group, a polyether group, an epoxy group, a hydroxyl group, an amide group, a thiol group, and a carboxyl group; the active polar group comprises at least one of a hydroxyl group, a carboxyl group, an amide group, and an amine group; the saturated vapor pressure is less than 10 -3 mmHg acrylate monomer, whose boiling point is ≥250°C; uniformly dispersed to obtain the quantum dot ink as described above; at 25°C, the viscosity of the quantum dot ink is 2-20mPa s and the surface tension is 20-35mN / m.

7. A color film, characterized in that: Prepared from the quantum dot ink according to any one of claims 1 to 5.

8. A display device, characterized in that: Comprising the color film as claimed in claim 7.

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