CN110808336B

CN110808336B - Organic light-emitting panel and preparation method thereof

Info

Publication number: CN110808336B
Application number: CN201911101232.5A
Authority: CN
Inventors: 吴宝昕
Original assignee: Shenzhen Hechen Technology Co ltd
Current assignee: Shenzhen Hechen Technology Co ltd
Priority date: 2019-11-12
Filing date: 2019-11-12
Publication date: 2022-06-21
Anticipated expiration: 2039-11-12
Also published as: CN110808336A

Abstract

The invention provides an organic light-emitting panel and a preparation method thereof.A hole injection layer of the organic light-emitting panel is formed by doping metal oxide particles with a high molecular compound; wherein the metal oxide particles are not doped within a certain distance from the surface of the hole injection layer away from the substrate to the inside of the hole injection layer, the distance being equal to or greater than the crystal grain size corresponding to the maximum value of the crystal grain size distribution of the metal oxide particles and equal to or less than the crystal grain size corresponding to the minimum value of the crystal grain size distribution of the metal oxide particles). The doping distribution is beneficial to reducing the roughness of the surface of the hole injection layer, so that the surface state of the interface of the hole injection layer and the hole transport layer (or the organic light emitting layer) is reduced, and the risk of short circuit of the anode and the cathode of the OLED device is reduced.

Description

Organic light-emitting panel and preparation method thereof

Technical Field

The invention relates to the technical field of organic light emitting, in particular to an organic light emitting panel and a preparation method thereof.

Background

Organic Light Emitting Diodes (OLEDs) have the advantages of being light, thin, active, fast in response, large in viewing angle, and the like, so that the OLEDs are getting more and more focused on illumination and display industries as a surface light source technology. In the existing common high-performance OLED structure, a hole injection layer is usually added between an anode and a hole transport layer or an organic light emitting layer, and the hole injection layer can effectively adjust a potential barrier between the anode and the hole transport layer or between the anode and the organic light emitting layer, so that the current density, the brightness and the light emitting efficiency of the OLED are affected. Meanwhile, in order to further improve the hole injecting ability of the hole injecting layer, metal oxide particles such as ruthenium oxide, molybdenum oxide, vanadium oxide, and tungsten oxide are generally doped in the hole injecting layer.

However, the incorporation of metal oxide particles will result in an increase in the surface roughness of the hole injection layer. This increase in surface roughness, on the one hand, will result in the generation of surface states at the interface between the hole injection layer and the hole transport layer (or organic light emitting layer), which will trap holes; on the other hand, the risk of shorting the anode and cathode of the OLED device is also increased.

Disclosure of Invention

In view of the above problems, the present invention provides an organic light emitting panel and a method for manufacturing the same, which reduces the surface roughness of a hole injection layer doped with metal oxide particles.

The present invention provides an organic light emitting panel, which includes a substrate 100, and an anode 110, a hole injection layer 120, an organic light emitting layer 140 and a cathode 170 sequentially disposed on the substrate; the hole injection layer 120 is characterized in that a high molecular compound 220 is doped with metal oxide particles 210; the doping concentration of the metal oxide particles 210 in the polymer compound gradually decreases from the surface close to the substrate 100 to the surface far from the substrate 100, and the metal oxide particles are not doped from the surface far from the substrate 100 of the hole injection layer to the inside of the hole injection layer within a distance that is greater than or equal to a crystal grain size CEN corresponding to a maximum value of a crystal grain size distribution of the metal oxide particles 210 and is less than or equal to a crystal grain size MAX corresponding to a minimum value of the crystal grain size distribution of the metal oxide particles 210.

Wherein, the polymer compound 220 can be one or more of PEDOT, Poly-TPD, and PVK.

The metal oxide particles 210 may be one or more of ruthenium oxide, molybdenum oxide, vanadium oxide, and tungsten oxide.

The invention also provides a preparation method of the organic light-emitting panel, which comprises the following steps:

s310, preparing an organic polymer compound solution required by preparing a hole injection layer;

s320, mixing the metal oxide particles with the organic polymer solution to prepare mixed solutions with different metal oxide particle contents;

s330: sequentially coating mixed liquor with different metal oxide particle contents on the anode to form a hole injection layer; wherein the doping concentration of the metal oxide particles in the high molecular compound is gradually reduced from the surface close to the substrate to the surface far from the substrate, and the metal oxide particles are not doped in a certain distance from the surface far from the substrate of the hole injection layer to the inside of the hole injection layer, wherein the distance is greater than or equal to the crystal grain size CEN corresponding to the maximum value of the crystal grain size distribution of the metal oxide particles and is less than or equal to the crystal grain size MAX corresponding to the minimum value of the crystal grain size distribution of the metal oxide particles;

s340: and annealing the prepared hole injection layer at 80-120 deg.C for 20-40 min.

Drawings

Fig. 1 is a schematic view of an organic luminescent panel of an embodiment of the present invention.

Fig. 2 is a schematic structural view of a hole injection layer of an organic light-emitting panel according to an embodiment of the present invention.

FIG. 3 is a schematic view of the grain size distribution of metal oxide particles.

Fig. 4 is a process of manufacturing an organic light emitting panel according to an embodiment of the present invention.

Detailed Description

Embodiments of the present application will be described in detail by examples, so that how to apply technical means to solve technical problems and achieve technical effects can be fully understood and implemented.

Fig. 1 is a schematic view of an organic light emitting panel of an embodiment of the present invention. The organic light emitting panel includes a substrate 100, and an anode 110, a hole injection layer 120, a hole transport layer 130, an organic light emitting layer 140, an electron transport layer 150, an electron injection layer 160, and a cathode 170 sequentially disposed on the substrate.

The substrate 100 may be a glass substrate, a metal substrate, a resin substrate, or other common substrates.

As shown in fig. 2, the hole injection layer 120 is formed by doping the metal oxide particles 210 with the high molecular compound 220, wherein the doping concentration of the metal oxide particles 210 in the high molecular compound gradually decreases from the surface close to the substrate 100 to the surface away from the substrate 100, and the metal oxide particles are not doped from the surface of the hole injection layer away from the substrate 100 to the inside of the hole injection layer within a distance which is greater than or equal to the crystal grain size CEN corresponding to the maximum value of the crystal grain size distribution of the metal oxide particles 210 and less than or equal to the crystal grain size MAX corresponding to the minimum value of the crystal grain size distribution of the metal oxide particles 210, as shown by the black dots in fig. 3. The polymer compound 220 may be PEDOT, Poly-TPD, PVK, etc., and the metal oxide particles 210 may be ruthenium oxide, molybdenum oxide, vanadium oxide, tungsten oxide, etc. It will be appreciated by those skilled in the art that such a doping distribution of the metal oxide particles 210 in the hole injection layer 120 is beneficial to reduce the roughness of the surface of the hole injection layer, thereby reducing not only the surface states at the interface of the hole injection layer and the hole transport layer, but also the risk of shorting the anode and cathode of the OLED device.

Fig. 4 is a step diagram of a method of manufacturing an organic light emitting panel according to the present invention, in which the organic light emitting panel includes a substrate 100, and an anode 110, a hole injection layer 120, a hole transport layer 130, an organic light emitting layer 140, an electron transport layer 150, an electron injection layer 160, and a cathode 170, which are sequentially disposed on the substrate, as shown in fig. 1. The preparation method comprises the following steps:

s310: an organic polymer compound solution required for preparing a hole injection layer is prepared. Wherein the organic polymer compound can be PEDOT, Poly-TPD, PVK, etc.;

s320: mixing metal oxide particles with an organic polymer solution to prepare mixed solutions with different metal oxide particle contents;

s330: sequentially coating mixed liquor with different metal oxide particle contents on the anode to form a hole injection layer; the doping concentration of the metal oxide particles 210 in the polymer compound gradually decreases from the surface close to the substrate 100 to the surface far from the substrate 100, and the metal oxide particles are not doped from the surface far from the substrate 100 of the hole injection layer to the inside of the hole injection layer within a distance that is equal to or greater than a crystal grain size CEN corresponding to a maximum value of a crystal grain size distribution of the metal oxide particles and equal to or less than a crystal grain size MAX corresponding to a minimum value of the crystal grain size distribution of the metal oxide particles.

The luminescent layer, the electron transport layer, the electron injection layer and the cathode on the hole injection layer can be prepared by a vacuum evaporation process.

There are many other possible embodiments of the present invention, which are not listed here, and the embodiments claimed in the claims of the present invention can be implemented. Further, the contents not described in detail in the specification of the present application belong to the common general knowledge of those skilled in the art.

Claims

1. An organic light-emitting panel includes a substrate (100), and an anode (110), a hole injection layer (120), an organic light-emitting layer (140), and a cathode (170) sequentially disposed on the substrate (100); the hole injection layer (120) is characterized in that a high molecular compound (220) is doped with metal oxide particles (210); wherein the doping concentration of the metal oxide particles (210) in the polymer compound gradually decreases from the surface close to the substrate (100) to the surface far from the substrate (100), and the metal oxide particles are not doped within a distance from the surface far from the substrate (100) of the hole injection layer to the inside of the hole injection layer, the distance being equal to or greater than a crystal grain size CEN corresponding to a maximum value of a crystal grain size distribution of the metal oxide particles (210) and equal to or less than a crystal grain size MAX corresponding to a minimum value of the crystal grain size distribution of the metal oxide particles (210).

2. An organic light-emitting panel according to claim 1, characterized in that the polymer compound (220) is one or more of PEDOT, Poly-TPD, PVK.

3. The organic light-emitting panel according to claim 1, wherein the metal oxide particles (210) are one or more of ruthenium oxide, molybdenum oxide, vanadium oxide, tungsten oxide.

4. A method of preparing an organic light emitting panel according to claim 1, the method comprising:

s310, preparing an organic polymer compound solution required for preparing a hole injection layer;

5. The method of claim 4 wherein the polymer compound is one or more of PEDOT, Poly-TPD, PVK.

6. The method of making an organic light emitting surface of claim 5 wherein the metal oxide particles are one or more of ruthenium oxide, molybdenum oxide, vanadium oxide, tungsten oxide.