Method for improving OLED packaging effect

Abstract

The invention relates to the technical field of OLED packaging, in particular to a method for improving the OLED packaging effect. The invention provides a method for improving the packaging effect of an OLED (Organic Light Emitting Diode), which comprises the following steps: preparing a composite film of calcium oxide and barium oxide on the surface of an OLED device, and sequentially carrying out glass laminating and packaging treatment to obtain a packaged OLED. According to the invention, the composite film of calcium oxide and barium oxide is introduced between the OLED device and the packaging structure to absorb water vapor, so that the compactness and barrier property of the packaging layer are improved, the erosion of water vapor to the OLED is effectively blocked, and the purpose of remarkably improving the packaging property and stability of the OLED is achieved. Therefore, the service life of the OLED is obviously prolonged; and the method is simple and feasible, and is suitable for large-scale production.

Description

Technical Field

[0001] The present invention relates to the technical field of OLED packaging, and in particular to a method for improving OLED packaging effect. Background Art

[0002] Organic electroluminescent displays (OLEDs) are a new type of flat panel display that has attracted widespread attention due to their potential application value in many electroluminescent devices. It is known that traditional OLED displays have the advantages of good color contrast, active luminescence, wide viewing angle, thinness, fast response speed and low energy consumption.

[0003] However, the performance of conventional OLED displays, especially the electrodes and organic layers therein, is easily degraded by the oxygen and moisture leaking into the OLED display from the surrounding environment, which seriously affects the service life of the OLED. Therefore, the conventional method is to use an encapsulation layer to hermetically isolate the electrodes and organic layers in the OLED display from the surrounding environment to increase the service life of the OLED display. However, the adhesion performance between the encapsulation layer and the glass substrate, the compactness of the encapsulation layer, and the barrier performance need to be improved. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a method for improving the encapsulation effect of OLED, which can improve the compactness and barrier performance of the encapsulation layer and effectively prevent the corrosion of water vapor to the OLED device.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] The present invention provides a method for improving OLED packaging effect, comprising the following steps:

[0007] After a composite film of calcium oxide and barium oxide is prepared on the surface of the OLED device, glass bonding and encapsulation processes are performed in sequence to obtain an encapsulated OLED.

[0008] Preferably, the mass ratio of calcium oxide to barium oxide in the composite film of calcium oxide and barium oxide is (1-3):1.

[0009] Preferably, the thickness of the composite film of calcium oxide and barium oxide is 50 to 200 nm.

[0010] Preferably, the composite film of calcium oxide and barium oxide is prepared by evaporation or coating.

[0011] Preferably, when the preparation method of the composite film of calcium oxide and barium oxide is an evaporation method, the evaporation temperature is 150-300° C., the evaporation rate of calcium oxide is 0.1-1 nm / s, and the evaporation rate of barium oxide is 0.1-0.5 nm / s.

[0012] Preferably, when the preparation method of the composite thin film of calcium oxide and barium oxide is a coating method, the preparation method of the composite thin film of calcium oxide and barium oxide comprises:

[0013] Mixing calcium oxide, barium oxide and a solvent to obtain a sol;

[0014] After the sol is coated on the surface of the OLED device, it is cured to obtain the composite film of calcium oxide and barium oxide.

[0015] Preferably, the solvent includes one or more of ethanol, acetone and deionized water;

[0016] The concentration of calcium oxide in the sol is 1-30 wt %.

[0017] Preferably, the curing temperature is 80-150°C.

[0018] Preferably, after the curing is completed, heat treatment is also included.

[0019] Preferably, the heat treatment temperature is 100-300° C. and the time is 1-3 hours.

[0020] The present invention provides a method for improving the packaging effect of OLED, comprising the following steps: after preparing a composite film of calcium oxide and barium oxide on the surface of an OLED device, sequentially performing glass bonding and packaging treatment to obtain a packaged OLED. The present invention introduces a composite film of calcium oxide and barium oxide between the OLED device and the packaging structure to absorb water vapor, thereby improving the compactness and barrier properties of the packaging layer, effectively blocking the erosion of water vapor on the OLED, and achieving the purpose of significantly improving the packaging performance and stability of the OLED. As a result, the service life of the OLED is significantly extended; and the method is simple and easy to implement, and is suitable for large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the packaged OLED prepared by the method described in Example 1, wherein 1 is a CMOS circuit, 2 is an OLED device, 3 is a composite film of calcium oxide and barium oxide, 4 is an adhesive layer, 5 is a glass plate, 2-1 is an anode layer, 2-2 is an OLED layer, 2-3 is a cathode layer, and 2-4 is a TFE layer. DETAILED DESCRIPTION

[0022] The present invention provides a method for improving OLED packaging effect, comprising the following steps:

[0023] After a composite film of calcium oxide and barium oxide is prepared on the surface of the OLED device, glass bonding and encapsulation processes are performed in sequence to obtain an encapsulated OLED.

[0024] In the present invention, unless otherwise specified, all preparation raw materials are commercially available products well known to those skilled in the art.

[0025] The present invention prepares a composite film of calcium oxide and barium oxide on the surface of an OLED device, and then sequentially performs glass bonding and packaging processes to obtain a packaged OLED.

[0026] Before preparing the composite film of calcium oxide and barium oxide, the present invention also preferably includes sequentially cleaning and drying the OLED device; the present invention has no special limitation on the cleaning and drying process, and the process well known to those skilled in the art can be used. In the present invention, the cleaning and drying process can remove impurities and moisture on the surface of the OLED device.

[0027] In the present invention, the preparation method of the composite thin film of calcium oxide and barium oxide is preferably a vapor deposition method or a coating method.

[0028] In the present invention, when the preparation method of the composite thin film of calcium oxide and barium oxide is a vapor deposition method, the vapor deposition temperature is preferably 150-300°C, more preferably 200-250°C; the vapor deposition rate of calcium oxide is preferably 0.1-1nm / s, more preferably 0.3-0.7nm / s; the vapor deposition rate of barium oxide is preferably 0.1-0.5nm / s, more preferably 0.2-0.3nm / s. In the present invention, controlling the above-mentioned vapor deposition condition parameters can well control the thickness and uniformity of the prepared composite thin film of calcium oxide and barium oxide.

[0029] In the present invention, when the preparation method of the composite thin film of calcium oxide and barium oxide is a coating method, the preparation method of the composite thin film of calcium oxide and barium oxide preferably includes:

[0030] Mixing calcium oxide, barium oxide and a solvent to obtain a sol;

[0031] After the sol is coated on the surface of the OLED device, it is cured to obtain the composite film of calcium oxide and barium oxide.

[0032] The invention mixes calcium oxide, barium oxide and a solvent to obtain a sol.

[0033] In the present invention, the solvent preferably includes one or more of ethanol, acetone and deionized water. When the solvent is two or more of the above-mentioned specific options, the present invention has no special limitation on the ratio of the above-mentioned specific substances, and they can be mixed in any ratio.

[0034] The present invention does not have any special limitation on the mixing process, and the mixing process may be carried out using a process well known to those skilled in the art.

[0035] In the present invention, the concentration of calcium oxide in the sol is preferably 1-30wt%, more preferably 5-30wt%, and most preferably 10-20wt%. The mass ratio of calcium oxide to barium oxide is preferably (1-3):1, more preferably (1.5-2.5):1.

[0036] After obtaining the sol, the present invention coats the sol on the surface of the OLED device and then solidifies it to obtain the composite film of calcium oxide and barium oxide.

[0037] The present invention does not have any special limitation on the coating process, and the coating process may be carried out using a process well known to those skilled in the art.

[0038] In the present invention, the curing temperature is preferably 80 to 150°C, and the curing conditions are preferably 100 to 120°C.

[0039] In the present invention, after obtaining the composite film of calcium oxide and barium oxide, heat treatment is preferably further included. The temperature of the heat treatment is preferably 100-300°C, more preferably 150-300°C, and most preferably 200-250°C; the time of the heat treatment is preferably 1-3 hours, and more preferably 2-3 hours.

[0040] In the present invention, the heat treatment can improve its stability and compactness.

[0041] In the present invention, the process of laminating the glass is preferably to use an adhesive or glue to laminat the glass; the laminating temperature is preferably room temperature, and the pressure is preferably 0.5 MPa. In the present invention, controlling the laminating temperature and pressure can avoid damage to the OLED device.

[0042] In the present invention, the packaging process is preferably to seal the edges of the product obtained by laminating the glass using edge sealing technology and then perform curing. In the present invention, the packaging process can prevent water vapor and oxygen from invading from the edges. The present invention does not have any special restrictions on the curing process, and the process well known to those skilled in the art can be used.

[0043] The technical solutions in the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] Example 1

[0045] Providing an OLED device: sequentially arranging an anode layer (made of ITO with a thickness of 50 nm), an OLED layer (with a thickness of 100 nm), a cathode layer (made of magnesium-silver alloy with a mass ratio of magnesium to silver of 4:6 and a thickness of 10 nm), and a TFE layer (with a thickness of 500 nm) on the surface of a CMOS circuit;

[0046] The OLED device is cleaned by an ultrasonic cleaning device to remove surface impurities and moisture, and then the OLED device is placed in a drying oven for drying, and calcium oxide and barium oxide are prepared on the surface of the OLED device by evaporation (the evaporation rate of calcium oxide is 0.5 nm / s, the evaporation rate of barium oxide is 0.25 nm / s, and the evaporation temperature is 200° C.), and then heat-treated (the temperature of the heat treatment is 250° C., and the time is 2 hours) to obtain a composite film of calcium oxide and barium oxide;

[0047] The OLED device prepared with the composite thin film of calcium oxide and barium oxide is bonded to the glass plate by using an adhesive (material is epoxy resin), and the edge is sealed by edge sealing technology to obtain a packaged OLED (structural schematic diagram as shown in FIG. Figure 1 shown).

[0048] Comparative Example 1

[0049] Refer to Example 1, except that the preparation of the composite film of calcium oxide and barium oxide is omitted.

[0050] The packaged OLEDs described in Example 1 and Comparative Example 1 were subjected to a double 85 test and a hot and cold shock test, and the test result of the packaged OLED described in Example 1 was better;

[0051] There is no difference in the optical test results and brightness decay life of the encapsulated OLEDs described in Example 1 and Comparative Example 1.

[0052] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A method for improving OLED encapsulation effect, characterized in that: The following steps are involved: After a composite film of calcium oxide and barium oxide is prepared on the surface of the OLED device, glass bonding and encapsulation processes are performed in sequence to obtain an encapsulated OLED.

2. The method according to claim 1, characterized in that The mass ratio of calcium oxide to barium oxide in the composite film of calcium oxide and barium oxide is (1-3):

1.

3. The method according to claim 1 or 2, characterized in that The thickness of the composite film of calcium oxide and barium oxide is 50-200 nm.

4. The method according to claim 1, characterized in that The preparation method of the composite film of calcium oxide and barium oxide is an evaporation method or a coating method.

5. The method according to claim 4, characterized in that When the preparation method of the composite film of calcium oxide and barium oxide is an evaporation method, the evaporation temperature is 150-300° C., the evaporation rate of calcium oxide is 0.1-1 nm / s, and the evaporation rate of barium oxide is 0.1-0.5 nm / s.

6. The method according to claim 4, characterized in that When the preparation method of the composite thin film of calcium oxide and barium oxide is a coating method, the preparation method of the composite thin film of calcium oxide and barium oxide comprises: Mixing calcium oxide, barium oxide and a solvent to obtain a sol; After the sol is coated on the surface of the OLED device, it is cured to obtain the composite film of calcium oxide and barium oxide.

7. The method according to claim 6, characterized in that The solvent includes one or more of ethanol, acetone and deionized water; The concentration of calcium oxide in the sol is 1-30 wt %.

8. The method according to claim 6 or 7, characterized in that The curing temperature is 80-150°C.

9. The method according to claim 8, characterized in that After the curing is completed, heat treatment is also included.

10. The method according to claim 9, characterized in that The heat treatment temperature is 100-300° C. and the time is 1-3 hours.

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