CN-116193901-B - Electroluminescent device packaging desiccant solid film, desiccant liquid and packaging method thereof

Abstract

The invention relates to the technical field of display and discloses an electroluminescent device packaging drying agent solid film, a drying liquid agent and a packaging method thereof, wherein the electroluminescent device packaging drying agent solid film comprises ZnO nano particles doped with metal atoms, and the surfaces of the ZnO nano particles doped with metal atoms are provided with organic functional groups containing-OH structures; the drying liquid for the solid film of the electroluminescent device packaging drying agent comprises alcohol serving as a solvent and drying agent, wherein the drying agent comprises ZnO nano-particles doped with metal atoms, and the surfaces of the ZnO nano-particles doped with metal atoms are provided with organic functional groups containing-OH structures; the method for packaging the electroluminescent device comprises the step of dripping the dry liquid agent on the inner surface of the packaging cover plate, and heating to remove the solvent to form a solid film. The electroluminescent device packaging desiccant solid film, the drying liquid and the packaging method thereof provided by the invention are simple and efficient, low in cost, easy to store, good in packaging effect and strong in adsorption capacity.

Inventors

• WEN MINGYUE
• LI JINGQUN
• WANG YUNJUN

Assignees

• 苏州星烁纳米科技有限公司

Dates

Publication Date

20260508

Application Date

20221216

Claims (9)

1. 1. The electroluminescent device packaging drying agent solid film is characterized by comprising ZnO nano particles doped with metal atoms, wherein the surfaces of the ZnO nano particles doped with the metal atoms are provided with organic functional groups containing-OH structures, the doped metal atoms comprise at least one of Mg, li, al, ga, sn, and the mass percentage of the organic functional groups relative to the solid film is 8-25%.
2. 2. The electroluminescent device package desiccant solid film of claim 1, wherein the doping amount of the metal atoms is 0.1% -30%.
3. 3. The electroluminescent device package desiccant solid film according to any one of claims 1-2, wherein the solid film has a thickness of less than 500 microns.
4. 4. The drying liquid for the electroluminescent device packaging drying agent solid film is characterized by comprising an alcohol solvent and a drying agent, wherein the drying agent comprises ZnO nano particles doped with metal atoms, the surfaces of the ZnO nano particles doped with the metal atoms are provided with organic functional groups containing-OH structures, the doped metal atoms comprise at least one of Mg, li, al, ga, sn, and the mass percentage of the organic functional groups relative to the drying agent is 8-25%.
5. 5. The desiccant liquid formulation for an electroluminescent device package desiccant solid film of claim 4, wherein the alcoholic solvent comprises a short chain mono-or di-alcohol having a boiling point below 100 ℃.
6. 6. The desiccant solid film desiccant liquid for an electroluminescent device according to claim 4, wherein the doping amount of metal atoms is 0.1% -30%.
7. 7. The drier liquid for packaging drier solid film of claim 4, wherein the metal atom doped ZnO nano particles account for 10% -30% by weight of the drier liquid.
8. 8. A method of encapsulating an electroluminescent device, characterized in that the dry liquid formulation according to any one of claims 4-7 is dripped onto the inner surface of an encapsulation cover plate, and the solvent is removed by heating.
9. 9. The method of encapsulating an electroluminescent device of claim 8, wherein the thickness of the solid film formed after heating is less than 500 microns.

Description

Electroluminescent device packaging desiccant solid film, desiccant liquid and packaging method thereof Technical Field The invention belongs to the technical field of display, and particularly relates to an electroluminescent device packaging desiccant solid film, a drying liquid agent and a packaging method thereof. Background QLED (Quantum Dot LIGHT EMITTING Diodes) has a structure very similar to OLED technology, and the main difference is that the light emitting center of QLED is a Quantum Dot thin layer made of Quantum Dot (Quantum dots) material, and the layer is put into a Backlight Unit (BLU) of a Liquid Crystal Display (LCD). Quantum dot light emitting diodes (QLEDs) have attracted considerable attention in the optoelectronic industry for their excellent performance, in particular in terms of color purity, brightness and emission tunability, and have achieved excellent performance in terms of both efficiency and stability, making them the preferred devices for display and lighting technologies. In addition, water and oxygen in the atmosphere can also chemically react with luminescent materials, functional materials and the like in the QLED device, so that the performances such as color purity, brightness, efficiency and the like are reduced. In order to maintain the performance and reasonable lifetime of QLED devices, suitable encapsulation barrier materials are employed such that water vapor permeability (WVTR) <1 x 10 -3g/m2/day (25 ℃,40% rh)), oxygen permeability <1 x 10 -3cm3/m2/day is one of the keys for QLED display device development. At present, the QLED device is packaged to be separated from oxygen and vapor in the air, and a desiccant (or a drying sheet) is filled in the device to absorb the vapor, oxygen and various acid/alkaline gases in the device, so that the service life of the device can be effectively prolonged. In general, packaging of light emitting devices such as QLED adopts a sandwich structure, and metal oxide or inorganic oxide is deposited on a substrate film (polyester PET, polyimide film PI, polyethylene naphthalate PEN, polyvinyl alcohol PVA) or the like by vacuum evaporation, ion sputtering, chemical vapor deposition or the like, and then an organic film is coated to form a packaging film with a three-layer or multi-layer structure. In the three-layer structure, the metal oxide or inorganic oxide film plays a key role in blocking water oxygen permeation. A known method for preparing a high-barrier electronic packaging film is to deposit aluminum oxide/magnesium oxide on a base film as a water-oxygen barrier layer by Atomic Layer Deposition (ALD) (j.mate.chem C,2017,5,4017-4024). However, due to the size of the cavity deposited by the atomic layer, large-area continuous large-scale preparation is difficult to carry out, and the cost is high. The invention Chinese patent ZL (02149122.4) discloses a packaging layer of an organic electroluminescent device, a preparation method and application thereof, wherein the packaging layer comprises a thin film layer formed by alternately forming a polymer material layer and a ceramic material layer with a certain cycle number and a thick film layer of an organic insulator material positioned on the thin film layer. Chinese patent invention (zl 200710105977. X) also reports a flexible organic electroluminescent device whose encapsulation structure comprises a thick film layer formed of a polymeric material, wherein the thick film layer is doped with at least one of alkali metal, alkaline earth metal, metal oxide, zeolite, metal purificate of long chain alkane, sulfate, chloride, perchlorate, and effective adsorption of water and oxygen is achieved by introducing such encapsulation material at both sides of the device. Another water-oxygen barrier layer applied to water-oxygen encapsulation of flexible electronic and display devices is disclosed in chinese patent No. 2015132928. X, wherein inorganic particles are dispersed on a polymer layer, or the inorganic particles are generated or grafted on a polymer monomer having a carbon-carbon double bond such as methyl methacrylate, vinyl chloride or styrene or a dianhydride and a diamine monomer, a diacid and a diamine monomer or a diacid and a diol monomer through chemical reaction, and then the polymer layer is obtained through polymerization reaction to realize high-efficiency water-oxygen barrier performance. The barrier film can meet the requirement of water-oxygen barrier of up to 10 -5-10-6, and is used for QLED devices, and the water-oxygen barrier can be achieved, but the manufacturing cost is too high, so that the requirements of differentiation and low cost of the middle-end barrier films are difficult to meet. Furthermore, the existing drying agent needs protection of inert gas, and has harsh storage conditions. Therefore, it is needed to realize a packaging material which is simple, efficient, low in cost, and convenient for large-area and continuous preparation, so as to fur