WO2020206736A1

WO2020206736A1 - Organic light-emitting diode device

Info

Publication number: WO2020206736A1
Application number: PCT/CN2019/083985
Authority: WO
Inventors: 毕研亮
Original assignee: 深圳市华星光电半导体显示技术有限公司
Priority date: 2019-04-09
Filing date: 2019-04-24
Publication date: 2020-10-15
Also published as: CN110112303A

Abstract

An organic light-emitting diode device (10), comprising, in sequence from bottom up: a glass substrate (1), an anode layer (2), an electron transmission layer (3), a functional layer (4), a hole transmission layer (5), and a cathode layer (6), the electron transmission layer (3) being of a mesoporous material. By means of selecting a mesoporous material as the electron transmission layer (3), the electron transmission of the organic light-emitting diode device (10) may be promoted, an organic layer of the device may be protected, and when there is no packaging, the service life of the organic light-emitting diode device (10) may be increased.

Description

Organic Light Emitting Diode Device

Technical field

The present invention relates to the field of display, in particular to an organic light emitting diode device.

Background technique

Organic light emitting diode devices (Organic Light Emitting Diode, OLED) are also called organic electroluminescent displays and organic light emitting semiconductors. Because of its self-luminous, infinitely high contrast ratio, wide viewing angle, low power consumption, extremely fast response, and flexible display, it has been regarded as a new generation of display technology since its discovery.

For organic light-emitting diode devices, lifetime issues are the biggest factor affecting the possibility of final mass production. But there are few effective methods to solve the problem of device life. This is because the fragility of the organic layer is extremely sensitive to water or oxygen, especially the intrusion of moisture in the air will cause the device life to drop sharply.

Usually in order to improve the life of the device, the first way, we will focus on the packaging of the device, through good packaging technology to block the intrusion of water and oxygen. It is true that this guarantees the life of the device to a certain extent. However, the current life is still not able to meet the demand, and there is a risk. Once the encapsulant ages and creates a gap channel, the device will quickly deteriorate.

The second way is to improve the stability of the device by improving the device structure and film materials. Most of this method is to avoid the use of corrosive materials, design the structure of the organic light emitting diode device according to reasonable material energy level matching, and improve the life of the device through stable materials. But generally, the life time of the organic light emitting diode device is very short under the condition of no packaging.

technical problem

The purpose of the present invention is to provide an organic light-emitting diode device, which can be used as an electron transport layer by selecting a reasonable film layer material, the introduced mesoporous material is nano-particles, and the structure of the material itself. Next, the life span of the organic light emitting diode device is improved.

Technical solutions

In order to solve the above problems, an embodiment of the present invention provides an organic light emitting diode device, which includes a glass substrate, an anode layer, an electron transport layer, a functional layer, a hole transport layer, and a cathode layer from bottom to top, wherein the electron transport The layer is made of mesoporous material to protect the functional layer.

Further, wherein the material of the electron transport layer is zinc oxide.

Further, wherein the mesoporous material is a nano-particle, and the nano-particle is in a spherical shape.

Further, wherein the mesoporous material is a nanoparticle, and the diameter of the nanoparticle ranges from 1 nm to 60 nm.

Further, the film forming method of the electron transport layer includes spin coating or sputtering the mesoporous material.

Further, the film forming method of the electron transport layer further includes inkjet printing the mesoporous material.

Further, wherein the functional layer penetrates into the mesoporous material of the electron transport layer of the electron transport layer to increase the contact area between the two.

Further, the material of the functional layer is organic.

Further, the material of the hole transport layer is MoO ₃ .

Further, the material of the cathode layer is silver.

Beneficial effect

The advantage of the present invention is to provide an organic light-emitting diode device. By selecting nanoparticle mesoporous materials as the electron transport layer, the electron transmission of the organic light-emitting diode device can be promoted, and the organic layer of the device can be protected. Next, the life span of the organic light emitting diode device is improved.

Description of the drawings

FIG. 1 is a schematic structural diagram of an organic light emitting diode device in an embodiment of the present invention;

Figure 2 shows the lifetime results of organic light emitting diode devices without packaging and mesoporous materials;

Figure 3 shows the life results of organic light emitting diode devices without packaging and mesoporous materials;

Fig. 4 is a schematic diagram of the reaction principle of mesoporous zinc oxide crystal defects and oxygen.

The components in the figure are identified as follows:

1 glass substrate, 2 anode layer, 3 electron transport layer, 4 functional layer, 5 hole transport layer, 6 cathode layer, 10 organic light emitting diode device, 31 nanometer particles.

Embodiments of the invention

In the present invention, unless otherwise clearly defined and defined, the "above" or "below" of the first feature of the second feature may include the first and second features in direct contact, or may include the first and second features Not in direct contact but through other features between them. Moreover, "above", "above" and "above" the second feature of the first feature include the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is higher in level than the second feature. The "below", "below" and "below" the first feature of the second feature include the first feature directly below and obliquely below the second feature, or it simply means that the level of the first feature is smaller than the second feature.

In the present invention, the same or corresponding parts are denoted by the same reference numerals regardless of the figure number. Throughout the specification, when the terms "first" and "second" can be used to describe various parts, these The components need not be limited to the above wording. The above terms are only used to distinguish one component from another.

Referring to FIG. 1, an embodiment of the present invention provides an organic light emitting diode device 10, which includes a glass substrate 1, an anode layer 2, an electron transport layer 3, a functional layer 4, a hole transport layer 5, and The cathode layer 6, wherein the electron transport layer 3 is made of mesoporous material to protect the functional layer 4. The mesoporous material can prevent water vapor from entering, and can achieve a protective effect on the functional layer 4. In this embodiment, the mesoporous material is nanoparticles 31.

Wherein, the material of the electron transport layer 3 is zinc oxide.

The present invention uses the mesoporous material as the electron transport layer 3 to modify the electrode structure, and its functions are as follows: first, the mesoporous material itself has excellent electron transport performance and is preferred as the electron transport layer 3. Second, since the mesoporous material 31 is a nanoparticle 31, the membrane structure is a mesoporous structure, and the advantage of the mesoporous structure is that it can greatly contact the functional layer 4. Third, the actual composition of the mesoporous material is nano-zinc oxide, which has good water absorption and can prevent water vapor from contacting the functional layer 4, so that the water vapor is first consumed by the zinc oxide material and can react preferentially with oxygen. Among the above three points, this material can be used as a protective layer of the organic layer and an electron transport medium.

Wherein, the nano-particles 31 of the mesoporous material are quasi-spherical and tend to be spheres as a whole. However, due to the growth of defects, there may be gaps in one or more places in the sphere structure.

Wherein, the diameter of the nanoparticles 31 of the mesoporous material ranges from 1 nm to 60 nm.

Wherein, the film forming method of the electron transport layer 3 is differentiated according to the diameter range of the nanoparticle 31 of the mesoporous material. When the diameter of the nanoparticle 31 is between 10nm-60nm, spin coating or sputtering is used. The film forming method of the mesoporous material; when the diameter of the nanoparticle 31 is less than 10 nm, an inkjet printing device can be used to inkjet printing the film forming method of the mesoporous material.

Wherein, the functional layer 4 penetrates into the mesoporous material of the electron transport layer 3 of the electron transport layer 3, or into the gaps of the nanoparticles 31, to increase the contact area between the two.

Wherein, the material of the functional layer 4 is organic.

Wherein, the material of the hole transport layer 5 is an ET material, preferably MoO ₃ .

Wherein, the material of the cathode layer 6 is silver.

The organic light-emitting diode device 10 is subjected to a life test under an ambient humidity of 40%, room temperature, and darkroom conditions, and a photocell pulse source (Photocell Emitter, PCE) is used as a measurement index for statistics. Please refer to FIG. 2, which is the result of the lifetime of the organic light emitting diode device 10 without encapsulation and mesoporous material, and the lifetime is 6 hours. Please refer to FIG. 3, which is the result of the life of the organic light emitting diode device 10 without encapsulation and mesoporous material. The nanoparticle 31 of the mesoporous material (such as zinc oxide) is fully contacted with the functional layer 4, and the organic light emitting diode Compared with the organic light emitting diode device 10 that does not use a mesoporous material structure, the lifetime of the device 10 is greatly improved. Taking the phototube pulse source reduced to 1.0% as an example, the time shown in FIG. 2 is 3 hours, and the time shown in FIG. 3 is 43 days, which shows that the use of mesoporous materials can increase the life of the organic light emitting diode device 10 by 344 times.

Please refer to FIG. 4, which is a schematic diagram of the reaction principle of zinc oxide crystal defects and oxygen in the mesoporous material. First, the existence of the defect structure of the nano-particle zinc oxide crystals enables it to interact with oxygen and move electrons; secondly, the oxygen combines with some electrons during the electron transport process, and the oxygen fills the oxygen vacancies through the electron transport effect. Repair the zinc oxide crystal defects to fill the vacancies; finally, the filled vacancies make the defective crystals become pseudo-pure semiconductors and promote electron transmission. In summary, the existence of the nano-particle zinc oxide crystal defect structure enables it to interact with oxygen to compensate for the existence of the defect body, which not only prevents oxygen from degrading the functional layer 4, but also promotes the transmission of electrons.

The advantage of the present invention is to provide an organic light-emitting diode device. By selecting mesoporous materials as the electron transport layer, the electron transport of the organic light-emitting diode device can be promoted, and the organic layer of the device can be protected. Lifetime of organic light emitting diode devices.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered This is the protection scope of the present invention.

Claims

An organic light emitting diode device, which includes a glass substrate, an anode layer, an electron transport layer, a functional layer, a hole transport layer, and a cathode layer from bottom to top, wherein the electron transport layer is made of mesoporous material to protect the述functional layer.
The organic light emitting diode device according to claim 1, wherein the material of the electron transport layer is zinc oxide.
The organic light emitting diode device according to claim 1, wherein the mesoporous material is nano-particles, and the nano-particles are spherical.
The organic light emitting diode device of claim 1, wherein the mesoporous material is a nanoparticle, and the diameter of the nanoparticle is in the range of 1nm-60nm.
The organic light emitting diode device according to claim 1, wherein the film forming method of the electron transport layer comprises spin coating or sputtering the mesoporous material.
The organic light emitting diode device according to claim 1, wherein the film forming method of the electron transport layer further comprises inkjet printing the mesoporous material.
The organic light emitting diode device of claim 1, wherein the functional layer penetrates into the mesoporous material of the electron transport layer to increase the contact area between the two.
The organic light emitting diode device according to claim 1, wherein the material of the functional layer is organic.
The organic light emitting diode device according to claim 1, wherein the hole transport layer material is MoO 3.
The organic light emitting diode device according to claim 1, wherein the material of the cathode layer is silver.