Uv glue, perovskite quantum dot glue and perovskite quantum dot packaging structure

Abstract

The application discloses a UV glue, a perovskite quantum dot glue liquid and a perovskite quantum dot packaging structure. The UV glue comprises the following components: a prepolymer, a single-functional monomer, a double-functional monomer, a multi-functional monomer and a photoinitiator; the prepolymer comprises at least one of aliphatic polyurethane oligomers; the multi-functional monomer comprises di-trimethylolpropane tetraacrylate. The aliphatic polyurethane oligomer prepolymer and the multi-functional monomer di-trimethylolpropane tetraacrylate are combined in the UV glue, the crosslinking property is good, the viscosity adjustability is large, the requirement for a coating device is low, the UV glue is suitable for industrial production, and the problem of invalid edges of perovskite quantum dot films generated under severe aging conditions can be effectively solved.

Description

Technical Field

[0001] This application relates to a UV adhesive, a perovskite quantum dot adhesive, and a perovskite quantum dot encapsulation structure, belonging to the field of display technology. Background Technology

[0002] Over the years, the development of display technology has relied on LCD technology. LCD has become the most mature, widely used, and rapidly developing display device among many flat panel display devices. LCD has advantages such as thinness, low power consumption, soft image, and good heat dissipation. As the manufacturing cost of LCD continues to decline, it is widely used in display products such as mobile phones, tablets, and televisions. As a passive display device, LCD relies on a white backlight and color filters to achieve full-color display. Currently, most backlights use InGaN blue LED chips to excite YAG:Ce3+ phosphors to achieve white light. However, the phosphor material has a wide half-width at half-maximum (HWHM) and low color purity. Under the action of color filters, not only is the light transmittance reduced, but the color gamut is also not high (~75% NTSC).

[0003] In recent years, quantum dot technology has been widely used in lighting, display, and biological detection. In particular, perovskite quantum dots, which are different from traditional Cd-containing quantum dots, have opened up the market for backlight displays. Display manufacturers such as TCL, Samsung, and Hisense have successively launched high color gamut (~120% NTSC) displays equipped with quantum dot light conversion films, leading the quantum dot display boom.

[0004] However, perovskite quantum dots cannot be used directly and need to be encapsulated with water-oxygen barrier films and adhesive resins. However, the cross-linking density of general water-based and solvent-based pressure-sensitive adhesives is low, and their ability to prevent water and oxygen from damaging the quantum dots is weak. After a period of harsh blue light aging, the encapsulated films show failure edges ranging from 1 to 100 mm, which affects their use in displays. Summary of the Invention

[0005] According to one aspect of this application, a UV adhesive is provided, wherein the UV adhesive is a combination of an aliphatic polyurethane oligomer prepolymer and a polyfunctional monomer 2-trimethylolpropane tetraacrylate, exhibiting good crosslinking properties, high viscosity adjustability, low requirements for coating equipment, and suitability for industrial production. This UV adhesive can effectively solve the problem of ineffective edges generated in perovskite quantum dot films under harsh aging conditions.

[0006] A UV adhesive, the UV adhesive comprising the following components: prepolymer, monofunctional monomer, difunctional monomer, polyfunctional monomer, and photoinitiator;

[0007] The prepolymer includes at least one of aliphatic polyurethane oligomers;

[0008] The polyfunctional monomer includes 2-trimethylolpropane tetraacrylate.

[0009] Optionally, the aliphatic polyurethane oligomer includes at least one of aliphatic polyurethane acrylate, aliphatic polyurethane hexaacrylate, and tin-free aliphatic polyurethane diacrylate.

[0010] Optionally, the monofunctional monomer includes 4-tert-butylcyclohexyl acrylate, ethylurea methacrylate, m-phenoxybenzyl methacrylate, dicyclopentenyl acrylate, dicyclopentenyl ethoxyacrylate, ethoxyphenoxyacrylate, 3,3,5-trimethylcyclohexyl acrylate, o-phenylphenoxyethyl acrylate, 2-(p-isopropylphenyl-phenoxy)-ethyl acrylate, ethoxyethoxyethyl acrylate, cyclotrimethylolpropane methyl acetal acrylate, carboxyethyl acrylate, tetrahydrofurfuryl acrylate, and laurate acrylate. Stearic acid acrylate, propoxy nonylphenol acrylate, isodecyl acrylate, isooctyl acrylate, dicyclopentenyl ethoxy methacrylate, oxetane methacrylate, isodecyl methacrylate, 2-phenoxyethyl methacrylate, methoxy polyethylene glycol (350) methacrylate, tetrahydrofurfuryl methacrylate, laurate methacrylate, stearic acid methacrylate, glycidyl methacrylate, isobornyl acrylate, cyclohexyl methacrylate, benzyl acrylate, benzyl methacrylate, isobornyl methacrylate Bicyclopentyl methacrylate, 2-ethylhexyl methacrylate, isotridecyl acrylate, o-phenylphenoxyethyl acrylate, n-octyl acrylate, tetrahydrofuran acrylate, isotridecyl methacrylate, dicyclopentyl methacrylate, lauryl methacrylate, cycloaliphatic methacrylate, methoxy polyethylene glycol (550) methacrylate, methoxy polyethylene glycol (550) monoacrylate, triethylene glycol ethyl ether methacrylate, alkoxydodecyl acrylate, tetrahydrofuran methacrylate, alicyclic acrylate, 2(2-ethoxy) At least one of the following: (ethoxy) ethyl acrylate, octadecyl acrylate, dodecyl methacrylate, stearyl acrylate, dodecyl acrylate, 2-phenoxyethyl acrylate, isodecanyl acrylate, cycloaliphatic acrylate, isobornyl methacrylate, isooctyl acrylate, octyl acrylate, tridecyl acrylate, caprolactone acrylate, ethoxylated nonylphenol acrylate, isobornyl acrylate, trimethylolpropane formal acrylate, methoxy polyethylene glycol monoacrylate, alkyl tetrahydrofuran acrylate, and alkyl nonylphenol acrylate;

[0011] The bifunctional monomers include 3-hydroxy-2,2-dimethylpropyl-3-hydroxy-2,2-dimethylpropyl acrylate, tricyclodecanedimethylethanol diacrylate, dioxanediol diacrylate, polypropylene glycol (700) diacrylate, 1,6-hexanediol diacrylate, ethoxylated 1,6-hexanediol diacrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, polyethylene glycol (200) diacrylate, and 1,4-butanediol diacrylate. Diol diacrylate, neopentyl glycol diacrylate, polyethylene glycol (400) diacrylate, bisphenol A diacrylate ester oxyethyl ester, 2-methyl-1,3-propanediol diacrylate, 2-methyl-1,3-propanediol diacrylate ester oxyethyl ester, 3-methyl-1,5-pentanediol dipropionate, ethylene glycol dimethacrylate, tricyclodecanediethanol dimethacrylate, tripropylene glycol dimethacrylate, 1,4-butanediol The following is a list of at least one of the following: dimethacrylate, 2-hydroxyethyl methacrylate phosphate, neopentyl glycol diacrylate, polyethylene glycol (600) diacrylate, diethylene glycol methyl diacrylate, triethylene glycol methyl diacrylate, bisphenol A ethoxylated dimethacrylate, propoxylated ethoxylated dimethacrylate, trimethylolpropane triacrylate, trimethylolpropane triacrylate, alkylhexanediethanol diacrylate, alkylhexanediol diacrylate, alkylhexanediol diacrylate, alkylhexanediol diacrylate, triethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, 1,3-butanediol diacrylate, diethylene glycol dimethacrylate, 1,6-hexanediol dimethacrylate, neopentyl glycol dimethacrylate, 1,12-dodecyl dimethacrylate, tetraethylene glycol diacrylate, triethylene glycol diacrylate, and tripropylene glycol diacrylate.

[0012] Optionally, the photoinitiator includes at least one of 2-methyl-1-[4-(methylthio)phenyl]-2-morpholino]-1-propanone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, benzoin dimethyl ether, 2-hydroxy-2-methyl-1-phenyl-1-propanone, 1-hydroxy-cyclohexyl-phenyl ketone, benzophenone, isopropylthioxanthanone (a mixture of 2,4 isomers), ethyl 4-(N,N-dimethylamino)benzoate, isooctyl 4-(N,N-dimethyl)benzoate, 2-isopropylthioxanthanone, 2-benzyl-2-(dimethylamino)-4-morpholino, 4-phenylxylene ketone, and methyl o-benzoylbenzoate.

[0013] Optionally, the mass ratio of the prepolymer, monofunctional monomer, difunctional monomer, polyfunctional monomer, and photoinitiator is 5-50:5-40:5-40:5-40:1-10.

[0014] Optionally, the mass ratio of the prepolymer, monofunctional monomer, difunctional monomer, polyfunctional monomer, and photoinitiator is 5-40:20-40:15-40:10-30:1-5.

[0015] According to another aspect of this application, a perovskite quantum dot adhesive is provided, the perovskite quantum dot adhesive comprising perovskite quantum dots and UV adhesive;

[0016] The UV adhesive is selected from the UV adhesives described above.

[0017] Optionally, the perovskite quantum dots include at least one of CsPbCl3, FAPbCl3, MAPbCl3, Cs2Sn2Cl6, CsPbBr3, FAPbBr3, MAPbBr3, Cs2Sn2Br6, CsPbI3, FAPbI3, MAPbI3, and Cs2Sn2I6.

[0018] Optionally, the mass of the perovskite quantum dots is 1 to 10% of the mass of the UV adhesive.

[0019] Optionally, the mass of the perovskite quantum dots is any one of 1%, 2.5%, 3%, 5%, 7%, or 10% of the mass of the UV adhesive, or a range between any two values.

[0020] According to another aspect of this application, the application of the aforementioned UV adhesive and the aforementioned perovskite quantum dot adhesive in perovskite quantum dot encapsulation is provided.

[0021] According to another aspect of this application, a perovskite quantum dot encapsulation structure is provided, wherein the perovskite quantum dot encapsulation structure comprises, from top to bottom, an upper water and oxygen diffusion barrier substrate, a perovskite quantum dot adhesive curing layer, and a lower water and oxygen diffusion barrier substrate.

[0022] The perovskite quantum dot adhesive layer is obtained by curing the perovskite quantum dot adhesive layer described above through UV irradiation.

[0023] As one implementation scheme, this application discloses a UV adhesive encapsulation formed by combining an aliphatic polyurethane acrylate high-performance prepolymer with a polyfunctional monomer di-trimethylolpropane tetraacrylate with high-strength adaptive crosslinking. This adhesive can be used to encapsulate perovskite quantum dots, effectively improving the crosslinking degree of the adhesive resin and addressing the problem of ineffective edges affecting display performance in optical films under harsh aging conditions.

[0024] This application reveals that aliphatic polyurethane oligomers exhibit minimal destructive effects and good compatibility with perovskite quantum dots.

[0025] This application discovers that aliphatic polyurethane acrylate prepolymer combined with polyfunctional monomer di-trimethylolpropane tetraacrylate exhibits good crosslinking properties, high viscosity adjustability, low requirements for coating equipment, and is suitable for industrial production.

[0026] As another implementation, this application discloses a UV adhesive formulation for use in perovskite quantum dot encapsulation. It significantly improves the situation where perovskite quantum dot optical conversion films exhibit noticeable invalid edges after aging under harsh blue light conditions for a certain period, affecting the normal backlight display and causing significant light leakage at the display edges. This formulation effectively avoids the formation of invalid edges. The UV adhesive formulation utilizes an aliphatic polyurethane acrylate prepolymer combined with a polyfunctional monomer, di-trimethylolpropane tetraacrylate, which has high crosslinking strength. This results in high crosslinking density and adjustable viscosity, which is beneficial for protecting perovskite quantum dots from water and oxygen damage. Furthermore, changes in adhesive viscosity have minimal impact on the control of invalid edges, making it suitable for coating with various coating equipment.

[0027] This invention uses highly cross-linked UV adhesive to encapsulate perovskite quantum dots in a "sandwich" physical structure, effectively solving the problem of invalid edges that occur under harsh blue light aging conditions, and ensuring that the light conversion film will not have edge light leakage problems in normal display applications.

[0028] This invention discovers that aliphatic polyurethane acrylate prepolymers cause minimal damage to the perovskite quantum dot system. Therefore, it further utilizes the combination of aliphatic polyurethane acrylate prepolymers and the polyfunctional monomer 2-trimethylolpropane tetraacrylate to form a highly cross-linked network, thereby improving the hydrophobicity and oxygen resistance of the UV adhesive and effectively mitigating the ineffective edge phenomenon. The combination of aliphatic polyurethane acrylate prepolymers and the polyfunctional monomer 2-trimethylolpropane tetraacrylate exhibits good cross-linking properties, high viscosity adjustability, and low requirements for coating equipment, making it suitable for industrial production.

[0029] This invention also found that the combination of aliphatic polyurethane acrylate prepolymer and polyfunctional monomer di-trimethylolpropane tetraacrylate allows for adjustable viscosity of each component (200-800 cps @ 25 degrees Celsius). The viscosity variation does not significantly affect the control level of the failure edge, making it suitable for coating with various coating equipment. This greatly improves the workability and equipment compatibility of this type of UV adhesive.

[0030] The UV adhesive in this invention has a 100% solids content and no solvent emission during curing, which solves the environmental and safety problems in the production coating process and avoids the drawbacks of harmful solvent emission during the coating of traditional solvent-based thermosetting pressure-sensitive adhesives, making it more environmentally friendly.

[0031] This invention provides a perovskite quantum dot encapsulation UV adhesive formulation that effectively improves ineffective edges. The UV adhesive formulation involves prepolymers, monofunctional monomers, difunctional monomers, polyfunctional monomers, and photoinitiators. During UV adhesive curing, the photoinitiator in the formulation absorbs ultraviolet light under ultraviolet irradiation and generates active free radicals or cations, initiating monomer polymerization and cross-linking chemical reactions. This allows the monomers and prepolymers to repeatedly cross-link, forming a three-dimensional network resin, causing the UV adhesive to transform from a liquid to a solid state within seconds.

[0032] The perovskite quantum dots involved in this invention are nanoscale ionic crystals, wherein the main chemical formula is at least one of CsPbCl3, FAPbCl3, MAPbCl3, Cs2Sn2Cl6, CsPbBr3, FAPbBr3, MAPbBr3, Cs2Sn2Br6, CsPbI3, FAPbI3, MAPbI3, and Cs2Sn2I6.

[0033] The water-oxygen diffusion barrier membrane of the present invention includes a barrier layer comprising at least one of inorganic substances Al2O3 and SiO2, and organic substances PVDC.

[0034] The water-oxygen diffusion barrier membrane involved in this invention includes a diffusion layer composed of at least one of PMMA particles, TiO2, or microstructures.

[0035] The UV adhesive formulation of this invention includes prepolymer, monofunctional monomer, difunctional monomer, polyfunctional monomer, and photoinitiator.

[0036] In this invention, the prepolymer in the UV adhesive formulation is an aliphatic polyurethane oligomer. Specifically, it can be at least one of the following: aliphatic polyurethane acrylate, aliphatic polyurethane hexaacrylate, or tin-free aliphatic polyurethane diacrylate.

[0037] In this invention, the monofunctional monomers in the UV adhesive formulation can be selected from 4-tert-butylcyclohexyl acrylate, methacrylate ethylurea ethoxylate, m-phenoxybenzyl acrylate, dicyclopentenyl acrylate, dicyclopentenyl ethoxyacrylate, ethoxyphenoxyacrylate, 3,3,5-trimethylcyclohexyl acrylate, o-phenylphenoxyethyl acrylate, 2-(p-isopropylphenyl-phenoxy)-ethyl acrylate, ethoxyethoxyethyl acrylate, cyclotrimethylolpropane methyl acetal acrylate, 2-carboxyethyl acrylate, tetrahydrofurfuryl acrylate, and propylene laurate. Ester, stearic acid acrylate, propoxy nonylphenol acrylate, isodecyl acrylate, isooctyl acrylate, dicyclopentenyl ethoxy methacrylate, oxybutane methacrylate, isodecyl methacrylate, 2-phenoxyethyl methacrylate, methoxy polyethylene glycol (350) methacrylate, tetrahydrofurfuryl methacrylate, lauric acid methacrylate, stearic acid methacrylate, glycidyl methacrylate, isobornyl acrylate, cyclohexyl methacrylate, benzyl acrylate, benzyl methacrylate, isobornyl methacrylate Ester, dicyclopentyl methacrylate, 2-ethylhexyl methacrylate, isotridecyl acrylate, o-phenylphenoxyethyl acrylate, n-octyl acrylate, tetrahydrofuran acrylate, isotridecyl methacrylate, dicyclopentyl methacrylate, lauryl methacrylate, cycloaliphatic methacrylate, methoxy polyethylene glycol (550) methacrylate, methoxy polyethylene glycol (550) monoacrylate, triethylene glycol ethyl ether methacrylate, alkoxydodecyl acrylate, tetrahydrofuran methacrylate, alicyclic acrylate, 2(2-ethylhexyl methacrylate) At least one of the following: (oxyethoxy)ethyl acrylate, octadecyl acrylate, dodecyl methacrylate, stearyl methyl acrylate, dodecyl acrylate, 2-phenoxyethyl acrylate, isodecanyl acrylate, cycloaliphatic acrylate, isobornyl methacrylate, isooctyl acrylate, octyl acrylate, tridecyl acrylate, caprolactone acrylate, ethoxylated nonylphenol acrylate, isobornyl acrylate, trimethylolpropane formal acrylate, methoxylated polyethylene glycol monoacrylate, alkyltetrahydrofuran acrylate, and alkylnonylphenol acrylate.

[0038] In this invention, the bifunctional monomer in the UV adhesive formulation can be selected from 3-hydroxy-2,2-dimethylpropyl-3-hydroxy-2,2-dimethylpropyl acrylate, tricyclodecanedimethylethanol diacrylate, dioxanediol diacrylate, polypropylene glycol (700) diacrylate, 1,6-hexanediol diacrylate, ethoxylated 1,6-hexanediol diacrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, and polyethylene glycol (200) diacrylate. 1,4-Butanediol diacrylate, neopentyl glycol diacrylate, polyethylene glycol (400) diacrylate, bisphenol A diacrylate, 2-methyl-1,3-propanediol diacrylate, 2-methyl-1,3-propanediol diacrylate, 3-methyl-1,5-pentanediol dipropionate, ethylene glycol dimethacrylate, tricyclodecanediethanol dimethacrylate, tripropylene glycol dimethacrylate, 1, At least one of the following: 4-butanediol dimethacrylate, 2-hydroxyethyl methacrylate phosphate, neopentyl glycol dimethacrylate, polyethylene glycol (600) dimethacrylate, diethylene glycol methyl dimethacrylate, triethylene glycol methyl dimethacrylate, bisphenol A dimethacrylate oxyacetylated, ethoxylated dimethacrylate, trimethylolpropane triacrylate, trimethylolpropane triacrylate, alkylhexanediethanol dimethacrylate, alkylhexanediol dimethacrylate, alkylhexanediol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, 1,3-butanediol dimethacrylate, diethylene glycol dimethacrylate, 1,6-hexanediol dimethacrylate, neopentyl glycol dimethacrylate, 1,12-dodecyl dimethacrylate, tetraethylene glycol dimethacrylate, diethylene glycol dimethacrylate, and dipropylene glycol dimethacrylate.

[0039] In this invention, the polyfunctional monomer in the UV adhesive formulation is 2-trimethylolpropane tetraacrylate.

[0040] In this invention, the photoinitiator in the UV adhesive formulation can be selected from at least one of the following: 2-methyl-1-[4-(methylthio)phenyl]-2-morpholino]-1-propanone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, benzoin dimethyl ether, 2-hydroxy-2-methyl-1-phenyl-1-propanone, 1-hydroxy-cyclohexyl-phenyl ketone, benzophenone, isopropylthioxanthonone (2,4 isomer mixture), ethyl 4-(N,N-dimethylamino)benzoate, isooctyl 4-(N,N-dimethyl)benzoate, 2-isopropylthioxanthonone, 2-benzyl-2-(dimethylamino)-4-morpholino, 4-phenylxylene ketone, and methyl o-benzoylbenzoate.

[0041] The technical effects of this invention (1. compatibility with perovskite quantum dots, 2. small ineffective edge, 3. adjustable viscosity) mainly rely on the combination of aliphatic polyurethane prepolymer and polyfunctional monomer di-trimethylolpropane tetraacrylate, while other components have little impact on the technical effects.

[0042] The beneficial effects that this application can produce include:

[0043] (1) The UV adhesive provided in this application uses aliphatic polyurethane oligomer as the prepolymer, which has low damage to perovskite quantum dots and good compatibility.

[0044] (2) The UV adhesive provided in this application is a combination of aliphatic polyurethane oligomer prepolymer and polyfunctional monomer di-trimethylolpropane tetraacrylate, which has good crosslinking properties, high viscosity adjustability, low requirements for coating equipment, and is suitable for industrial production. Attached Figure Description

[0045] Figure 1 This is a schematic diagram showing the appearance of ineffective edges on a perovskite quantum dot optical film under harsh aging conditions;

[0046] Figure 2 This is a structural diagram illustrating high-performance prepolymers and multifunctional monomers for perovskite quantum dots. Figure 2 A is a diagram illustrating the structure of the prepolymer. Figure 2 B is a multi-functional single-unit structure diagram. Detailed Implementation

[0047] The present application is described in detail below with reference to the embodiments, but the present application is not limited to these embodiments.

[0048] Unless otherwise specified, all raw materials used in the embodiments of this application were purchased through commercial channels.

[0049] The water and oxygen diffusion barrier film substrate consists of a barrier film purchased from Dai Nippon Printing, product model IB-PET-PXB(X) and a diffusion film purchased from Kangdexin, product model KDOP100N. The barrier film and diffusion film are composited with photosensitive adhesive to obtain the water and oxygen diffusion barrier film substrate.

[0050] Aliphatic polyurethane acrylate was purchased from Changxing, product model DR-U384;

[0051] The aromatic polyurethane acrylate was purchased from Sartoma, product model CN9167;

[0052] The silicone-modified polyurethane acrylate was purchased from Changxing, product model DR-U187.

[0053] Figure 1 This is a schematic diagram of an invalid edge appearing on a perovskite quantum dot optical film under harsh aging conditions.

[0054] Figure 2 This is a structural diagram illustrating high-performance prepolymers and multifunctional monomers for perovskite quantum dots. Figure 2 A is a diagram illustrating the structure of the prepolymer. Figure 2 B is a structural diagram of a multifunctional monomer. As one implementation scheme, the prepolymer in this UV adhesive can be selected from [a specific type of prepolymer]. Figure 2 The substance with the structure shown in A, the polyfunctional monomer can be selected from substances with... Figure 2 The substance with the structure shown in B.

[0055] Example 1 (Case 1):

[0056] First, prepare the UV adhesive. The prepolymer is aliphatic polyurethane acrylate, the monofunctional monomer is isobornyl acrylate, the difunctional monomer is tricyclodecanedimethylethanol diacrylate, the polyfunctional monomer is di-trimethylolpropanetetraacrylate, and the photoinitiator is 2,4,6-trimethylbenzoyl-diphenylphosphine oxide. The masses are 20g, 30g, 24g, 24g, and 2g, respectively.

[0057] First, weigh the prepolymer in a beaker, then weigh the monofunctional, difunctional, and polyfunctional monomers and the photoinitiator in sequence, and stir for 1 hour at a stirring speed of 200 r / min.

[0058] Next, prepare the quantum dot adhesive solution by adding MAPbBr3 quantum dot powder to the UV adhesive prepared above. The mass of MAPbBr3 added is 2.5% of the mass of the UV adhesive. Mix and stir for 1 hour at a stirring speed of 300 r / min.

[0059] Finally, a 50μm thick wet coating was applied between two water-oxygen diffusion barrier film substrates. After irradiation with a UV lamp (450nm) for 5 seconds, the film (structure from top to bottom: diffusion film - barrier film - perovskite quantum dot adhesive curing layer - barrier film - diffusion film) was removed and cut into 8cm×8cm pieces for further curing at 70℃ +38w / m 2 After 240 hours of blue light aging, the invalid edge values ​​and UV adhesive viscosity values ​​are recorded in Tables 1, 2 and 3 below.

[0060] Comparative Example 1 (Case 2):

[0061] First, prepare the UV adhesive. The prepolymer is an aromatic polyurethane acrylate, the monofunctional monomer is isobornyl acrylate, the difunctional monomer is tricyclodecanedimethylethanol diacrylate, the polyfunctional monomer is di-trimethylolpropanetetraacrylate, and the photoinitiator is 2,4,6-trimethylbenzoyl-diphenylphosphine oxide. The masses are 20g, 30g, 24g, 24g, and 2g, respectively. Weigh the prepolymer into a beaker, then weigh the monofunctional, difunctional, and polyfunctional monomers and the photoinitiator in sequence. Stir for 1 hour at a stirring speed of 200 rpm.

[0062] Next, prepare the quantum dot adhesive solution by adding MAPbBr3 quantum dot powder to the UV adhesive prepared above. The mass of MAPbBr3 added is 2.5% of the mass of the UV adhesive. Mix and stir for 1 hour at a stirring speed of 300 r / min.

[0063] Finally, the film was coated and cured. A wet coating with a thickness of 50 μm was applied between two layers of water and oxygen diffusion barrier film substrates. After being irradiated with a UV lamp (450 nm) for 5 seconds, the film was removed (structure is the same as in Example 1), cut into 8 cm × 8 cm pieces, and subjected to blue light aging at 70 °C + 38 W / m² for 240 h. The invalid edge value and UV adhesive viscosity value are recorded in Table 1 below.

[0064] Comparative Example 2 (Case 3):

[0065] First, prepare the UV adhesive. The prepolymer is silicone-modified polyurethane acrylate, the monofunctional monomer is isobornyl acrylate, the difunctional monomer is tricyclodecanedimethylethanol diacrylate, the polyfunctional monomer is di-trimethylolpropanetetraacrylate, and the photoinitiator is 2,4,6-trimethylbenzoyl-diphenylphosphine oxide. The masses are 20g, 30g, 24g, 24g, and 2g, respectively. Weigh the prepolymer into a beaker, then weigh the monofunctional, difunctional, and polyfunctional monomers and the photoinitiator in sequence. Stir for 1 hour at a stirring speed of 200 rpm.

[0066] Next, prepare the quantum dot adhesive solution by adding MAPbBr3 quantum dot powder to the UV adhesive prepared above. The mass of MAPbBr3 added is 2.5% of the mass of the UV adhesive. Mix and stir for 1 hour at a stirring speed of 300 r / min.

[0067] Finally, the film was coated and cured. A wet coating with a thickness of 50 μm was applied between two layers of water and oxygen diffusion barrier film substrates. After being irradiated with a UV lamp (450 nm) for 5 seconds, the film was removed (structure is the same as in Example 1), cut into 8 cm × 8 cm pieces, and subjected to blue light aging at 70 °C + 38 W / m² for 240 h. The invalid edge value and UV adhesive viscosity value are recorded in Table 1 below.

[0068] Table 1: UV adhesive formulations for cases (1-3) at 70℃ +38W / m 2 Comparison table of failure edge data after 240 hours of blue light aging

[0069] Aging time 48h 96h 240h Case 1 0.1mm 0.2mm 0.4mm Case 2 0.3mm 0.7mm 1.2mm Case 3 5.5mm 6mm 7mm

[0070] As shown in Table 1, the three finished product samples corresponding to the three cases underwent aging tests in a harsh blue light aging test environment (75℃, 38W / m²). 2The aliphatic polyurethane acrylate prepolymer system in the UV adhesive solution of Case 1 is well-suited for perovskite quantum dots (with minimal damage to perovskite quantum dots), with a failure edge not exceeding 0.4 mm, demonstrating excellent practicality and effectively solving the problem of failure edges generated in perovskite quantum dot films under harsh aging conditions. Therefore, aliphatic polyurethane acrylates are preferably selected as the stable prepolymer series for perovskite quantum dots.

[0071] Furthermore, the evaluation and selection of crosslinking densities with different polyfunctional monomers of aliphatic polyurethane acrylates were investigated. In Cases 4 to 8, the degree of crosslinking between five polyfunctional monomers and aliphatic polyurethane acrylates was compared at the ineffective edge values ​​of the film.

[0072] Comparative Example 3 (Case 4):

[0073] First, prepare the UV adhesive. The prepolymer is aliphatic polyurethane acrylate, the monofunctional monomer is isobornyl acrylate, the difunctional monomer is tricyclodecanedimethylethanol diacrylate, the polyfunctional monomer is ethoxylated trimethylolpropane triacrylate, and the photoinitiator is 2,4,6-trimethylbenzoyl-diphenylphosphine oxide. The masses are 20g, 30g, 24g, 24g, and 2g, respectively. Weigh the prepolymer into a beaker, then weigh the monofunctional, difunctional, and polyfunctional monomers and the photoinitiator in sequence. Stir for 1 hour at a stirring speed of 200 rpm.

[0074] Next, prepare the quantum dot adhesive solution by adding MAPbBr3 quantum dot powder to the UV adhesive prepared above. The mass of MAPbBr3 added is 2.5% of the mass of the UV adhesive. Mix and stir for 1 hour at a stirring speed of 300 r / min.

[0075] Finally, the coating is cured into a film. A wet coating with a thickness of 50 μm is applied between two layers of water and oxygen diffusion barrier film substrates. After being irradiated with a UV lamp (450 nm) for 5 seconds, the film is removed (structure is the same as in Example 1), cut into 8 cm × 8 cm sizes, and subjected to blue light aging at 70℃ + 38 w / m2 for 240 h. The invalid edge value and UV adhesive viscosity value are recorded in Table 2 below.

[0076] Comparative Example 4 (Case 5):

[0077] First, prepare the UV adhesive. The prepolymer is aliphatic polyurethane acrylate, the monofunctional monomer is isobornyl acrylate, the difunctional monomer is tricyclodecanedimethylethanol diacrylate, the polyfunctional monomer is pentaerythritol tetraacrylate, and the photoinitiator is 2,4,6-trimethylbenzoyl-diphenylphosphine oxide. The masses are 20g, 30g, 24g, 24g:2g, respectively. Weigh the prepolymer into a beaker, then weigh the monofunctional, difunctional, and polyfunctional monomers and the photoinitiator in sequence. Stir for 1 hour at a stirring speed of 200 rpm.

[0078] Next, prepare the quantum dot adhesive solution by adding MAPbBr3 quantum dot powder to the UV adhesive prepared above. The mass of MAPbBr3 added is 2.5% of the mass of the UV adhesive. Mix and stir for 1 hour at a stirring speed of 300 r / min.

[0079] Finally, the coating is cured into a film. A wet coating with a thickness of 50 μm is applied between two layers of water and oxygen diffusion barrier film substrates. After being irradiated with a UV lamp (450 nm) for 5 seconds, the film is removed (structure is the same as in Example 1), cut into 8 cm × 8 cm sizes, and subjected to blue light aging at 70℃ + 38 w / m2 for 240 h. The invalid edge value and UV adhesive viscosity value are recorded in Table 2 below.

[0080] Comparative Example 5 (Case 6):

[0081] First, prepare the UV adhesive. The prepolymer is aliphatic polyurethane acrylate, the monofunctional monomer is isobornyl acrylate, the difunctional monomer is tricyclodecanedimethylethanol diacrylate, the polyfunctional monomer is caprolactone-modified dipentaerythritol hexaacrylate, and the photoinitiator is 2,4,6-trimethylbenzoyl-diphenylphosphine oxide. The mass ratios are 20g:30g:24g:24g:2g. Weigh the prepolymer into a beaker, then weigh the monofunctional, difunctional, and polyfunctional monomers and the photoinitiator sequentially. Stir for 1 hour at a stirring speed of 200 rpm.

[0082] Next, prepare the quantum dot adhesive solution by adding MAPbBr3 quantum dot powder to the UV adhesive prepared above at a ratio of 2.5%, and mix and stir for 1 hour at a stirring speed of 300 r / min.

[0083] Finally, the coating is cured into a film. A wet coating with a thickness of 50 μm is applied between two layers of water and oxygen diffusion barrier film substrates. After being irradiated with a UV lamp (450 nm) for 5 seconds, the film is removed (structure is the same as in Example 1), cut into 8 cm × 8 cm sizes, and subjected to blue light aging at 70℃ + 38 w / m2 for 240 h. The invalid edge value and UV adhesive viscosity value are recorded in Table 2 below.

[0084] Comparative Example 6 (Case 7):

[0085] First, prepare the UV adhesive. The prepolymer is aliphatic polyurethane acrylate, the monofunctional monomer is isobornyl acrylate, the difunctional monomer is tricyclodecanedimethylethanol diacrylate, the polyfunctional monomer is propoxyglycerol triacrylate, and the photoinitiator is 2,4,6-trimethylbenzoyl-diphenylphosphine oxide. The mass ratios are 20g:30g:24g:24g:2g. Weigh the prepolymer into a beaker, then weigh the monofunctional, difunctional, and polyfunctional monomers and the photoinitiator sequentially. Stir for 1 hour at a stirring speed of 200 rpm.

[0086] Next, prepare the quantum dot adhesive solution by adding MAPbBr3 quantum dot powder to the UV adhesive prepared above. The mass of MAPbBr3 added is 2.5% of the mass of the UV adhesive. Mix and stir for 1 hour at a stirring speed of 300 r / min.

[0087] Finally, the coating is cured into a film. A wet coating with a thickness of 50 μm is applied between two layers of water and oxygen diffusion barrier film substrates. After being irradiated with a UV lamp (450 nm) for 5 seconds, the film is removed (structure is the same as in Example 1), cut into 8 cm × 8 cm sizes, and subjected to blue light aging at 70℃ + 38 w / m2 for 240 h. The invalid edge value and UV adhesive viscosity value are recorded in Table 2 below.

[0088] Comparative Example 7 (Case 8):

[0089] First, prepare the UV adhesive. The prepolymer is aliphatic polyurethane acrylate, the monofunctional monomer is isobornyl acrylate, the difunctional monomer is tricyclodecanedimethylethanol diacrylate, the polyfunctional monomer is propoxytrimethylolpropane triacrylate, and the photoinitiator is 2,4,6-trimethylbenzoyl-diphenylphosphine oxide. The mass ratios are 20g:30g:24g:24g:2g. Weigh the prepolymer into a beaker, then weigh the monofunctional, difunctional, and polyfunctional monomers and the photoinitiator sequentially. Stir for 1 hour at a stirring speed of 200 rpm.

[0090] Next, prepare the quantum dot adhesive solution by adding MAPbBr3 quantum dot powder to the UV adhesive prepared above. The mass of MAPbBr3 added is 2.5% of the mass of the UV adhesive. Mix and stir for 1 hour at a stirring speed of 300 r / min.

[0091] Finally, the coating is cured into a film. A wet coating with a thickness of 50 μm is applied between two layers of water and oxygen diffusion barrier film substrates. After being irradiated with a UV lamp (450 nm) for 5 seconds, the film is removed (structure is the same as in Example 1), cut into 8 cm × 8 cm sizes, and subjected to blue light aging at 70℃ + 38 w / m2 for 240 h. The invalid edge value and UV adhesive viscosity value are recorded in Table 2 below.

[0092] Table 2: UV adhesive formulations for cases (1, 4-8) at 70℃ +38W / m 2 Comparison table of failure edges and UV adhesive viscosity data after 240 hours of blue light aging

[0093]

[0094] As can be seen from Table 2, in Case 1 and Case 4 to Case 8, the degree of crosslinking between the six multifunctional monomers and aliphatic polyurethane acrylates was compared in terms of the ineffective edge value of the film. It can be clearly found that the combination of aliphatic polyurethane acrylates and di-trimethylolpropane tetraacrylate multifunctional monomers can obtain the smallest ineffective edge data, showing that the UV adhesive has a high crosslinking density.

[0095] Furthermore, under the premise of selecting a preferred prepolymer type of aliphatic polyurethane acrylate, a monofunctional monomer of isobornyl acrylate, a difunctional monomer of tricyclodecanedimethylethanol diacrylate, a polyfunctional monomer of di-trimethylolpropane tetraacrylate, and a photoinitiator of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, the overall viscosity of the UV adhesive can be controlled by adjusting the proportions of the prepolymer, monofunctional, difunctional, and polyfunctional monomers. The viscosity can be controlled from 200 to 800 cps at 25 degrees Celsius, thus adapting it to coating applications on various coating equipment without affecting the overall failure edge aging level of the film. This is specifically demonstrated in Cases 1 and 9, 10, with specific values ​​shown in Table 3.

[0096] Example 2 (Case 9):

[0097] First, prepare the UV adhesive. The prepolymer is aliphatic polyurethane acrylate, the monofunctional monomer is isobornyl acrylate, the difunctional monomer is tricyclodecanedimethylethanol diacrylate, the polyfunctional monomer is di-trimethylolpropane tetraacrylate, and the photoinitiator is 2,4,6-trimethylbenzoyl-diphenylphosphine oxide. The mass ratios are 5g:35g:29g:29g:2g. Weigh the prepolymer into a beaker, then weigh the monofunctional, difunctional, and polyfunctional monomers and the photoinitiator sequentially. Stir for 1 hour at a stirring speed of 200 rpm.

[0098] Next, prepare the quantum dot adhesive solution by adding MAPbBr3 quantum dot powder to the UV adhesive prepared above. The mass of MAPbBr3 added is 2.5% of the mass of the UV adhesive. Mix and stir for 1 hour at a stirring speed of 300 r / min.

[0099] Finally, the coating is cured into a film. A wet coating with a thickness of 50 μm is applied between two layers of water and oxygen diffusion barrier film substrates. After being irradiated with a UV lamp (450 nm) for 5 seconds, the film is removed (structure is the same as in Example 1), cut into 8 cm × 8 cm sizes, and subjected to blue light aging at 70℃ + 38 w / m2 for 240 h. The invalid edge value and UV adhesive viscosity value are recorded in Table 3 below.

[0100] Example 3 (Case 10):

[0101] First, prepare the UV adhesive. The prepolymer is aliphatic polyurethane acrylate, the monofunctional monomer is isobornyl acrylate, the difunctional monomer is tricyclodecanedimethylethanol diacrylate, the polyfunctional monomer is di-trimethylolpropanetetraacrylate, and the photoinitiator is 2,4,6-trimethylbenzoyl-diphenylphosphine oxide. The mass ratios are 40g:30g:18g:10g:2g. Weigh the prepolymer into a beaker, then weigh the monofunctional, difunctional, and polyfunctional monomers and the photoinitiator sequentially. Stir for 1 hour at a stirring speed of 200 rpm.

[0102] Next, prepare the quantum dot adhesive solution by adding MAPbBr3 quantum dot powder to the UV adhesive prepared above. The mass of MAPbBr3 added is 2.5% of the mass of the UV adhesive. Mix and stir for 1 hour at a stirring speed of 300 r / min.

[0103] Finally, the film was coated and cured. A wet coating with a thickness of 50 μm was applied between two layers of water and oxygen diffusion barrier film substrates using a coater. After irradiation with a UV lamp (450 nm) for 5 seconds, the film (structure same as in Example 1) was removed, cut into 8 cm × 8 cm pieces, and then subjected to 70°C + 38 W.

[0104] The UV adhesive was subjected to blue light aging for 240 hours per m2 area. The invalid edge values ​​and UV adhesive viscosity values ​​are recorded in Table 3 below.

[0105] Table 3: UV adhesive formulations for cases (1, 9-10) at 70℃ + 38W / m 2 Comparison table of failure edge data and viscosity data after 240 hours of blue light aging

[0106]

[0107] As can be seen from Table 3, changes in adhesive viscosity have virtually no impact on the control level of the failure edge, which can be controlled within 0.5mm, making it suitable for coating with various coating equipment.

[0108] The above description is merely a few embodiments of this application and is not intended to limit this application in any way. Although this application discloses preferred embodiments as described above, it is not intended to limit this application. Any changes or modifications made by those skilled in the art without departing from the scope of the technical solution of this application using the disclosed technical content are equivalent to equivalent implementation cases and all fall within the scope of the technical solution.

Claims

1. A UV adhesive, characterized in that, The UV adhesive comprises the following components: prepolymer, monofunctional monomer, difunctional monomer, polyfunctional monomer, and photoinitiator; The prepolymer is an aliphatic polyurethane acrylate; The polyfunctional monomer is 2-trimethylolpropane tetraacrylate; The mass ratio of the prepolymer, monofunctional monomer, difunctional monomer, polyfunctional monomer, and photoinitiator is 5-50:5-40:5-40:5-40:1-10.

2. The UV glue of claim 1, wherein, The monofunctional monomers include 4-tert-butylcyclohexyl acrylate, ethylurea methacrylate, m-phenoxybenzyl methacrylate, dicyclopentenyl acrylate, dicyclopentenyl ethoxyacrylate, ethoxyphenoxyacrylate, 3,3,5-trimethylcyclohexyl acrylate, o-phenylphenoxyethyl acrylate, 2-(p-isopropylphenyl-phenoxy)-ethyl acrylate, cyclotrimethylolpropane methyl acetal acrylate, carboxyethyl acrylate, tetrahydrofurfuryl acrylate, and laurate acrylate. Stearic acid acrylate, propoxy nonylphenol acrylate, isodecyl acrylate, isooctyl acrylate, dicyclopentenyl ethoxy methacrylate, oxybutane methacrylate, isodecyl methacrylate, 2-phenoxyethyl methacrylate, methoxy polyethylene glycol (350) methacrylate, tetrahydrofurfuryl methacrylate, stearic acid methacrylate, glycidyl methacrylate, cyclohexyl methacrylate, benzyl acrylate, benzyl methacrylate, dicyclopentyl methacrylate, methyl 2-Ethylhexyl acrylate, isotridecyl acrylate, o-phenylphenoxyethyl acrylate, n-octyl acrylate, tetrahydrofuran acrylate, isotridecyl methacrylate, dicyclopentyl methacrylate, lauryl methacrylate, cycloaliphatic methacrylate, methoxy polyethylene glycol (550) methacrylate, methoxy polyethylene glycol (550) monoacrylate, triethylene glycol ethyl ether methacrylate, alkoxydodecyl acrylate, tetrahydrofuran methacrylate, 2-(2-ethoxyethoxy) At least one of the following: ethyl acrylate, octadecyl acrylate, dodecyl methacrylate, stearyl methyl acrylate, dodecyl acrylate, 2-phenoxyethyl acrylate, isodecanyl acrylate, cycloaliphatic acrylate, isobornyl methacrylate, isooctyl acrylate, octyl acrylate, tridecyl acrylate, caprolactone acrylate, ethoxylated nonylphenol acrylate, isobornyl acrylate, trimethylolpropane formal acrylate, methoxy polyethylene glycol monoacrylate, and tetrahydrofuran acrylate. The bifunctional monomers include tricyclodecanedimethylethanol diacrylate, dioxanediol diacrylate, polypropylene glycol (700) diacrylate, 1,6-hexanediol diacrylate, ethoxylated 1,6-hexanediol diacrylate, dipropylene glycol diacrylate, polyethylene glycol (200) diacrylate, 1,4-butanediol diacrylate, propionyl oxyneoprene glycol diacrylate, polyethylene glycol (400) diacrylate, and ethoxylated bisphenol A. Diacrylate, 2-methyl-1,3-propanediol diacrylate, ethoxylated 2-methyl-1,3-propanediol diacrylate, 3-methyl-1,5-pentanediol dipropionate, ethylene glycol dimethacrylate, tricyclodecanediethanol dimethacrylate, tripropylene glycol dimethacrylate, 1,4-butanediol dimethacrylate, neopentyl glycol diacrylate, polyethylene glycol (600) diacrylate, diethylene glycol methyl diacrylate, triethylene glycol methyl diacrylate, ethoxylated bisphenol A At least one of the following: dimethacrylate, propoxyethyl dimethacrylate, trimethylolpropane triacrylate, cyclohexanediethanol diacrylate, alkylhexanediol diacrylate, alkylneopentyl glycol diacrylate, triethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, 1,3-butanediol diacrylate, diethylene glycol dimethacrylate, 1,6-hexanediol dimethacrylate, neopentyl glycol dimethacrylate, 1,12-dodecyl dimethacrylate, tetraethylene glycol diacrylate, triethylene glycol diacrylate, and tripropylene glycol diacrylate.

3. The UV glue of claim 1, wherein, The photoinitiator includes at least one of 2-methyl-1-[4-(methylthio)phenyl]-2-morpholino]-1-propanone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, benzoin dimethyl ether, 2-hydroxy-2-methyl-1-phenyl-1-propanone, 1-hydroxy-cyclohexyl-phenyl ketone, benzophenone, isopropylthioxanthonone (a mixture of 2,4 isomers), ethyl 4-(N,N-dimethylamino)benzoate, isooctyl 4-(N,N-dimethyl)benzoate, 2-isopropylthioxanthonone, 2-benzyl-2-(dimethylamino)-4-morpholine, 4-phenylxylene ketone, and methyl o-benzoylbenzoate.

4. A perovskite quantum dot glue liquid, characterized in that, The perovskite quantum dot adhesive comprises perovskite quantum dots and UV adhesive; The UV adhesive is selected from the UV adhesive described in any one of claims 1 to 3.

5. The perovskite quantum dot adhesive according to claim 4, characterized in that, The perovskite quantum dots include at least one of CsPbCl3, FAPbCl3, MAPbCl3, Cs2Sn2Cl6, CsPbBr3, FAPbBr3, MAPbBr3, Cs2Sn2Br6, CsPbI3, FAPbI3, MAPbI3, and Cs2Sn2I6. 6.The perovskite quantum dot glue solution of claim 4, wherein, The mass of perovskite quantum dots is 1% to 10% of the mass of UV adhesive.

7. The application of the UV adhesive according to any one of claims 1 to 3 and the perovskite quantum dot adhesive according to any one of claims 4 to 6 in perovskite quantum dot encapsulation.

8. A perovskite quantum dot encapsulation structure, characterized in that, The perovskite quantum dot encapsulation structure comprises, from top to bottom, an upper water and oxygen diffusion barrier substrate, a perovskite quantum dot adhesive curing layer, and a lower water and oxygen diffusion barrier substrate. The perovskite quantum dot adhesive curing layer is obtained by UV irradiation of the perovskite quantum dot adhesive according to any one of claims 4 to 6.

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