Display panel, manufacturing method thereof, and display device

Abstract

Provided are a display panel, a manufacturing method thereof, and a display device. The display panel includes: an electron transport layer including an electron transport material; a first light-emitting layer configured to emit a first color of light, the first light-emitting layer including a first main material and a first doping material; a mixed material layer located between the electron transport layer and the first light-emitting layer, the mixed material layer including a first material and a second material, the first material being a main material for forming a light-emitting layer emitting the first color of light, and the second material including an electron transport material. The life of a light-emitting device emitting the first color of light can be greatly improved, while the voltage and efficiency remain substantially unchanged.

Description

Technical Field

[0001] At least one embodiment of the present disclosure relates to a display panel, a manufacturing method thereof, and a display device. Background Art

[0002] Organic light-emitting diodes (OLEDs) are known as dream displays due to their high brightness, color saturation, lightness, and flexibility, and are widely used in the display field, for example, including the flat panel display field, but not limited thereto.

[0003] At present, the biggest problem with OLED display is the low lifespan of blue light OLED, which leads to defects such as powdering of the display in the later stage. It also restricts the application areas of OLED display, and OLED cannot be used in devices with longer service life.

[0004] In order to increase the lifespan of blue light OLEDs, one technical direction is to develop new blue light emitting materials. However, after years of development, the potential for improving the lifespan of blue light OLEDs from a material perspective has become smaller and smaller, and the cost has become higher and higher. Summary of the invention

[0005] At least one embodiment of the present disclosure relates to a display panel, a manufacturing method thereof, and a display device.

[0006] At least one embodiment of the present disclosure provides a display panel, comprising: an electron transport layer, comprising an electron transport material; a first light-emitting layer, configured to emit a first color light, the first light-emitting layer comprising a first main material and a first doping material; and a mixed material layer, located between the electron transport layer and the first light-emitting layer, the mixed material layer comprising a first material and a second material, the first material being a main material for forming a light-emitting layer emitting the first color light, and the second material comprising an electron transport material.

[0007] According to the display panel provided by one or more embodiments of the present disclosure, the first material is the same as the first main body material.

[0008] According to the display panel provided by one or more embodiments of the present disclosure, the second material of the mixed material layer and the electron transport material of the electron transport layer are the same.

[0009] According to the display panel provided by one or more embodiments of the present disclosure, the mass ratio of the first material to the second material ranges from 3:7 to 7:3.

[0010] According to the display panel provided by one or more embodiments of the present disclosure, the mixed material layer is in contact with the electron transport layer.

[0011] According to the display panel provided by one or more embodiments of the present disclosure, the mixed material layer is in contact with the first light-emitting layer.

[0012] According to the display panel provided by one or more embodiments of the present disclosure, the display panel further includes a base substrate, and the orthographic projection of the mixed material layer on the base substrate covers the orthographic projection of the first light-emitting layer on the base substrate.

[0013] According to the display panel provided by one or more embodiments of the present disclosure, the orthographic projection of the mixed material layer on the base substrate coincides with the orthographic projection of the electron transport layer on the base substrate.

[0014] According to the display panel provided by one or more embodiments of the present disclosure, the display panel also includes a second light-emitting layer, which is configured to emit a second color light, the second color light is different from the first color light, and the orthographic projection of the mixed material layer on the base substrate also covers the orthographic projection of the second light-emitting layer on the base substrate.

[0015] According to the display panel provided by one or more embodiments of the present disclosure, the second light-emitting layer is in contact with the mixed material layer.

[0016] According to the display panel provided by one or more embodiments of the present disclosure, the display panel also includes a third light-emitting layer, wherein the third light-emitting layer is configured to emit a third color light, each two of the first color light, the second color light and the third color light are different, and the orthographic projection of the mixed material layer on the base substrate also covers the orthographic projection of the third light-emitting layer on the base substrate.

[0017] According to the display panel provided by one or more embodiments of the present disclosure, the third light-emitting layer is in contact with the mixed material layer.

[0018] According to the display panel provided by one or more embodiments of the present disclosure, the display panel also includes a first electron blocking layer, a second electron blocking layer and a third electron blocking layer, the first electron blocking layer is located on the side of the first light-emitting layer away from the electron transport layer, the second electron blocking layer is located on the side of the second light-emitting layer away from the electron transport layer, the third electron blocking layer is located on the side of the third light-emitting layer away from the electron transport layer, the orthographic projection of the first electron blocking layer on the substrate coincides with the orthographic projection of the first light-emitting layer on the substrate, the orthographic projection of the second electron blocking layer on the substrate coincides with the orthographic projection of the second light-emitting layer on the substrate, and the orthographic projection of the third electron blocking layer on the substrate coincides with the orthographic projection of the third light-emitting layer on the substrate.

[0019] According to the display panel provided by one or more embodiments of the present disclosure, the display panel further includes a cathode located on a side of the electron transport layer away from the first light-emitting layer and an anode located on a side of the first light-emitting layer away from the electron transport layer.

[0020] According to the display panel provided by one or more embodiments of the present disclosure, the display panel also includes at least one of a hole injection layer and a hole transport layer, wherein the hole injection layer and the hole transport layer are both located on a side of the first light-emitting layer away from the electron transport layer, and the hole transport layer is closer to the first light-emitting layer than the hole injection layer.

[0021] According to the display panel provided by one or more embodiments of the present disclosure, the first color light includes blue light.

[0022] According to the display panel provided by one or more embodiments of the present disclosure, the mixed material layer is reused as a hole blocking layer.

[0023] At least one embodiment of the present disclosure further provides a display device, comprising any of the above-mentioned display panels.

[0024] At least one embodiment of the present disclosure also provides a method for manufacturing a display panel, comprising: forming an electron transport layer using an electron transport material; forming a first light-emitting layer using a first main material and a first doping material, the first light-emitting layer being configured to emit a first color of light; and forming a mixed material layer between the electron transport layer and the first light-emitting layer, the mixed material layer comprising a first material and a second material, the first material being a main material for forming a light-emitting layer that emits the first color of light, and the second material comprising an electron transport material.

[0025] According to the manufacturing method provided by one or more embodiments of the present disclosure, the first material is the same as the first main material.

[0026] According to the manufacturing method provided by one or more embodiments of the present disclosure, the electron transport layer and the mixed material layer use the same electron transport material.

[0027] According to the manufacturing method provided by one or more embodiments of the present disclosure, the mass ratio of the first material to the second material ranges from 3:7 to 7:3.

[0028] According to the manufacturing method provided by one or more embodiments of the present disclosure, the mixed material layer is in contact with the electron transport layer.

[0029] According to the manufacturing method provided by one or more embodiments of the present disclosure, the mixed material layer is in contact with the first light-emitting layer.

[0030] According to the manufacturing method provided by one or more embodiments of the present disclosure, an open mask is used to form the mixed material layer.

[0031] According to the manufacturing method provided by one or more embodiments of the present disclosure, the mixed material layer and the electron transport layer are formed by using the same open mask.

[0032] According to the manufacturing method provided by one or more embodiments of the present disclosure, the manufacturing method also includes forming a second light-emitting layer and forming a third light-emitting layer, the second light-emitting layer is configured to emit a second color light, the third light-emitting layer is configured to emit a third color light, each two of the first color light, the second color light and the third color light are different, and the orthographic projection of the mixed material layer on the base substrate covers the orthographic projections of the first light-emitting layer, the second light-emitting layer and the third light-emitting layer on the base substrate.

[0033] According to the manufacturing method provided by one or more embodiments of the present disclosure, the first color light includes blue light, the second color light includes green light, and the third color light includes red light.

[0034] According to the manufacturing method provided by one or more embodiments of the present disclosure, the manufacturing method also includes forming a first electron blocking layer, forming a second electron blocking layer and forming a third electron blocking layer, the first electron blocking layer is formed on the side of the first light-emitting layer away from the electron transport layer, the second electron blocking layer is formed on the side of the second light-emitting layer away from the electron transport layer, the third electron blocking layer is formed on the side of the third light-emitting layer away from the electron transport layer, the first electron blocking layer and the first light-emitting layer are formed using the same fine metal mask, the second electron blocking layer and the second light-emitting layer are formed using the same fine metal mask, and the third electron blocking layer and the third light-emitting layer are formed using the same fine metal mask. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present disclosure, but are not intended to limit the present disclosure.

[0036] Figure 1 is a schematic diagram of a partial layer structure of an OLED display panel;

[0037] Figure 2 A schematic diagram of a partial layer structure of a display panel provided by an embodiment of the present disclosure;

[0038] Figure 3 A schematic diagram of a partial layer structure of a display panel provided by an embodiment of the present disclosure;

[0039] Figure 4A A schematic diagram of a partial layer structure of a display panel provided by an embodiment of the present disclosure;

[0040] Figure 4B A schematic diagram of a partial layer structure of a display panel provided by an embodiment of the present disclosure;

[0041] Figure 5 is a graph showing the relationship between the life of a blue light device and time;

[0042] Figure 6 is a graph showing the relationship between the life of a green light device and time; and

[0043] Figure 7 This is a graph showing the relationship between the life of a red light device and time. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0045] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, "include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0046] Figure 1 Schematic diagram of a partial layer structure of an OLED display panel. Figure 1As shown, the display panel includes a hole injection layer HIL, a hole transport layer HTL, an electron blocking layer EBL, a light-emitting layer EML, a hole blocking layer HBL, an electron transport layer ETL and a cathode CT. The electron blocking layer EBL includes a first electron blocking layer EBL1, a second electron blocking layer EBL2 and a third electron blocking layer EBL3. The light-emitting layer EML includes a first light-emitting layer EML1, a second light-emitting layer EML2 and a third light-emitting layer EML3. The first light-emitting layer EML1 is configured to emit a first color light, the second light-emitting layer EML2 is configured to emit a second color light, and the third light-emitting layer EML3 is configured to emit a third color light. The first color light, the second color light and the third color light are all monochromatic light, and the first color light, the second color light and the third color light are lights of different colors. For example, the first color light is blue light, the second color light is green light, and the third color light is red light, but it is not limited thereto. The embodiments of the present disclosure are described by taking the first color light as blue light, the second color light as green light, and the third color light as red light as an example.

[0047] Figure 1 In the OLED display panel shown, the hole blocking layer HBL is formed of a common hole blocking material, such as a triazine compound and bis(2-methyl-8-hydroxyquinoline)(4-1-biphenyloxy)aluminum (BAlq), but is not limited thereto.

[0048] The performance of light-emitting devices mainly depends on the performance of the materials themselves and the device matching structure. The material direction mainly considers material mobility, material stability, material fluorescence quantum yield (PLQY), etc. The device matching structure direction mainly considers the energy level matching of adjacent film layers, exciton distribution, electron and hole injection and accumulation, etc. As for the problem of low life of blue light devices, it is currently believed that the main problem is the poor stability of blue light emitting materials and the accumulation of electrons at the interface between the light-emitting layer and the electron transport layer (ETL).

[0049] The display panel provided by the embodiment of the present disclosure is dedicated to solving the problem of electron accumulation at the interface between the light-emitting layer and the electron transport layer ETL. The display panel provided by the embodiment of the present disclosure solves the problem of electron accumulation at the interface between the light-emitting layer EML and the electron transport layer ETL by setting a mixed material layer between the light-emitting layer EML and the electron transport layer ETL.

[0050] Figure 2 FIG. 1 is a schematic diagram of a partial layer structure of a display panel provided by an embodiment of the present disclosure. Figure 2As shown, the display panel includes: an electron transport layer ETL, a first light-emitting layer EML1 and a mixed material layer MML. The electron transport layer ETL includes an electron transport material. The first light-emitting layer EML1 is configured to emit a first color light, and the first light-emitting layer EML1 includes a first main material and a first doping material. The mixed material layer MML is located between the electron transport layer ETL and the first light-emitting layer EML1, and the mixed material layer MML includes a first material and a second material. The first material is a main material for forming a light-emitting layer emitting the first color light. The second material includes an electron transport material. The first main material is a main material of the light-emitting layer emitting the first color light.

[0051] The display panel provided by the embodiment of the present disclosure, the mixed material layer includes a first material (a main material for forming a light-emitting layer emitting light of the first color) and a second material (an electron transport material), which can increase the molecular contact probability between the main material of the light-emitting layer emitting light of the first color and the electron transport material, improve the transmission probability of electrons from the molecules of the electron transport material to the molecules of the main material of the light-emitting layer emitting light of the first color, reduce material degradation and performance degradation caused by electron accumulation, and greatly improve the life of the light-emitting device emitting light of the first color, while the voltage and efficiency remain basically unchanged. For example, the mixed material layer can be formed by co-evaporation of two sources, so that the first material and the second material form a molecular level mixture.

[0052] The display panel provided by the embodiment of the present disclosure provides a display panel structure that can significantly improve the life of a device that emits a first color of light (e.g., a blue light OLED) from the perspective of device structure, while not affecting the performance of green and red light emitting devices such as OLED, and has great application value in the display field such as flat panel display. The display panel provided by the embodiment of the present disclosure has a device structure that is easy to mass produce.

[0053] For example, the first light-emitting layer EML1 is a blue light-emitting layer, the first host material includes a blue light first material (B-Host, BH), and the first doping material includes a blue light-emitting material (guest material). Thus, the display panel provided by the embodiment of the present disclosure can increase the molecular contact probability of the blue light host material and the electron transport material, improve the transmission probability of electrons from the molecules of the electron transport material to the molecules of the blue light host material, reduce material degradation and performance degradation caused by electron accumulation, and greatly improve the life of the blue light-emitting device.

[0054] For example, the mixed material layer MML can be configured to block holes and play the role of a hole blocking layer. That is, the mixed material layer MML is reused as a hole blocking layer. According to the material of the mixed material layer MML, it can be known that it can play the role of blocking holes.

[0055] According to a display panel provided in an embodiment of the present disclosure, the first material is the same as the first main material to facilitate material management, but is not limited thereto. In other embodiments, the first main material of the first light-emitting layer EML1 and the first material of the mixed material layer MML may also be different.

[0056] For example, in order to facilitate material management, the second material of the mixed material layer MML is the same as the electron transport material of the electron transport layer ETL, that is, the electron transport layer ETL and the mixed material layer MML use the same electron transport material, but not limited thereto. In other embodiments, the second material of the mixed material layer MML may also be different from the electron transport material of the electron transport layer ETL.

[0057] According to a display panel provided by an embodiment of the present disclosure, the mass ratio of the first material to the second material is in the range of 3:7 to 7:3. When the mass ratio of the first material to the second material is within the above range, it is beneficial to improve the life of the device emitting the first color light, and has no effect or little effect on its voltage and efficiency.

[0058] According to a display panel provided by an embodiment of the present disclosure, the mass ratio of the first material to the second material is 1:1. In this case, the life of the device emitting the first color light is the longest. When the mass ratio of the first material to the second material is 1:1, it is beneficial to both the transmission of electrons from the electron transport layer ETL to the mixed material layer MML and the transmission of electrons from the mixed material layer MML to the first light-emitting layer EML1.

[0059] According to the display panel provided by one embodiment of the present disclosure, the mass percentage of the first material in the mixed material layer MML is less than the mass percentage of the main material in the first light-emitting layer EML1, but is not limited thereto. The mass percentage of the first material refers to the ratio of the mass of the first material in the mixed material layer MML to the sum of the masses of the first material and the second material. The mass percentage of the main material in the first light-emitting layer EML1 refers to the ratio of the mass of the main material in the first light-emitting layer EML1 to the sum of the masses of the main material and the guest material. For example, the mass percentage of the first material in the mixed material layer MML is 30%-70%. The mass percentage of the main material in the first light-emitting layer EML1 is 90%-98%.

[0060] According to a display panel provided by an embodiment of the present disclosure, the mass percentage of the second material in the mixed material layer MML is less than the mass percentage of the electron transport material in the electron transport layer ETL. For example, the mass percentage of the second material in the mixed material layer MML is 30%-70%. For example, the mass percentage of the electron transport material in the electron transport layer ETL is close to 100%, but is not limited thereto. The mass percentage of the second material in the mixed material layer MML refers to the ratio of the mass of the second material in the mixed material layer MML to the sum of the masses of the first material and the second material.

[0061] According to an embodiment of the present disclosure, a display panel is provided, such as Figure 2 As shown, in order to make the structure of the display panel compact and facilitate the transmission of electrons, the mixed material layer MML is in contact with the electron transport layer ETL, but it is not limited thereto. The mixed material layer MML is in contact with the electron transport layer ETL to facilitate the transmission of electrons from the electron transport layer ETL to the mixed material layer MML. Of course, other layers can be set between the mixed material layer MML and the electron transport layer ETL.

[0062] According to an embodiment of the present disclosure, a display panel is provided, such as Figure 2 As shown, in order to make the structure of the display panel compact and facilitate the transmission of electrons, the mixed material layer MML is in contact with the first light-emitting layer EML1, but it is not limited thereto. The mixed material layer MML is in contact with the first light-emitting layer EML1 to facilitate the transmission of electrons from the mixed material layer MML to the first light-emitting layer EML1. Of course, other layers can be provided between the mixed material layer MML and the first light-emitting layer EML1.

[0063] In the display panel provided by some embodiments of the present disclosure, the mixed material layer MML contacts the electron transport layer ETL, and the mixed material layer MML contacts the first light-emitting layer EML1. In this case, in addition to the interface contact between the mixed material layer and the electron transport layer ETL and the first light-emitting layer EML1, the mixed material layer also has molecular contact between the first material (the main material for forming the light-emitting layer emitting the first color light) and the second material (the electron transport material), thereby increasing the probability of electrons being transmitted from the molecules of the electron transport material to the molecules of the main material of the light-emitting layer emitting the first color light, and reducing material degradation and performance degradation caused by electron accumulation.

[0064] like Figure 2 As shown, the display panel further includes a cathode CT. The cathode CT is located on the side of the electron transport layer ETL away from the first light emitting layer EML1. For example, the cathode CT can be made of a metal material. For example, the cathode CT can be made of magnesium and silver, but is not limited thereto.

[0065] Figure 3 A schematic diagram of a partial layer structure of a display panel provided in an embodiment of the present disclosure. Figure 3The display panel shown also shows a substrate BS and an anode AN. The anode AN is located on the side of the first light-emitting layer EML1 away from the electron transport layer ETL. For example, the anode AN is formed of indium tin oxide and silver, but not limited thereto. For example, the anode AN is in the form of a stack of three sub-layers of indium tin oxide / silver / indium tin oxide, but not limited thereto.

[0066] refer to Figure 3 and Figure 2 The display panel includes a first light emitting device EMC1, a second light emitting device EMC2, and a third light emitting device EMC3. The first light emitting device EMC1 is configured to emit a first color light, the second light emitting device EMC2 is configured to emit a second color light, and the third light emitting device EMC3 is configured to emit a third color light. The embodiment of the present disclosure is described by taking the first color light as blue light, the second color light as green light, and the third color light as red light as an example. However, it is not limited thereto. The first color light, the second color light, and the third color light may also be lights of other colors.

[0067] like Figure 3 As shown, the anode AN of the first light emitting device EMC1, the anode AN of the second light emitting device EMC2 and the anode AN of the third light emitting device EMC3 are independent of each other, so that they can be controlled by applying signals respectively. Figure 3 As shown, the anode AN of the first light emitting device EMC1, the anode AN of the second light emitting device EMC2, and the anode AN of the third light emitting device EMC3 are spaced apart from each other.

[0068] According to an embodiment of the present disclosure, a display panel is provided, such as Figure 3 As shown, the orthographic projection of the mixed material layer MML on the base substrate BS covers the orthographic projection of the first light emitting layer EML1 on the base substrate BS. For example, the mixed material layer MML can be formed by using an open mask to save costs.

[0069] According to an embodiment of the present disclosure, a display panel is provided, such as Figure 3 As shown, the orthographic projection of the mixed material layer MML on the substrate BS coincides with the orthographic projection of the electron transport layer ETL on the substrate BS. For example, the mixed material layer MML and the electron transport layer ETL can be formed using the same open mask.

[0070] According to an embodiment of the present disclosure, a display panel is provided, such as Figure 3As shown, the display panel also includes a second light-emitting layer EML2, the second light-emitting layer EML2 is configured to emit a second color light, the second color light is different from the first color light, and the orthographic projection of the mixed material layer MML on the base substrate BS also covers the orthographic projection of the second light-emitting layer EML2 on the base substrate BS. The provision of the mixed material layer MML has little or no effect on the performance of the second light-emitting device EMC2. For example, the voltage, efficiency, and life of the second light-emitting device EMC2 are basically unchanged. That is, compared with the second light-emitting device EMC2 without the mixed material layer MML, the voltage, efficiency, and life of the second light-emitting device EMC2 provided with the mixed material layer MML are basically unchanged.

[0071] According to an embodiment of the present disclosure, a display panel is provided, such as Figure 3 As shown, in order to make the structure of the display panel compact, the second light-emitting layer EML2 is in contact with the mixed material layer MML. In other embodiments, other layers may be disposed between the second light-emitting layer EML2 and the mixed material layer MML.

[0072] According to an embodiment of the present disclosure, a display panel is provided, such as Figure 3 As shown, the display panel further includes a third light-emitting layer EML3, and the third light-emitting layer EML3 is configured to emit a third color light, and each two of the first color light, the second color light, and the third color light are different, and the orthographic projection of the mixed material layer MML on the substrate BS also covers the orthographic projection of the third light-emitting layer EML3 on the substrate BS. The provision of the mixed material layer MML has basically no effect or little effect on the performance of the third light-emitting device EMC3. For example, the voltage, efficiency, and life of the third light-emitting device EMC3 are basically unchanged. That is, the voltage, efficiency, and life of the third light-emitting device EMC3 provided with the mixed material layer MML are basically unchanged compared with the third light-emitting device EMC3 not provided with the mixed material layer MML.

[0073] According to a display panel provided by an embodiment of the present disclosure, in order to make the structure of the display panel compact, the third light-emitting layer EML3 contacts the mixed material layer MML. In other embodiments, other layers may be provided between the third light-emitting layer EML3 and the mixed material layer MML.

[0074] According to an embodiment of the present disclosure, a display panel is provided, such as Figure 3As shown, the display panel also includes a first electron blocking layer EBL1, a second electron blocking layer EBL2 and a third electron blocking layer EBL3. The first electron blocking layer EBL1 is located on the side of the first light-emitting layer EML1 away from the electron transport layer ETL, the second electron blocking layer EBL2 is located on the side of the second light-emitting layer EML2 away from the electron transport layer ETL, and the third electron blocking layer EBL3 is located on the side of the third light-emitting layer EML3 away from the electron transport layer ETL. The orthographic projection of the first electron blocking layer EBL1 on the substrate substrate BS coincides with the orthographic projection of the first light-emitting layer EML1 on the substrate substrate BS, the orthographic projection of the second electron blocking layer EBL2 on the substrate substrate BS coincides with the orthographic projection of the second light-emitting layer EML2 on the substrate substrate BS, and the orthographic projection of the third electron blocking layer EBL3 on the substrate substrate BS coincides with the orthographic projection of the third light-emitting layer EML3 on the substrate substrate BS. In order to save costs and facilitate the manufacturing process, the first electron blocking layer EBL1 and the first light-emitting layer EML1 can be formed using the same fine metal mask, the second electron blocking layer EBL2 and the second light-emitting layer EML2 can be formed using the same fine metal mask, and the third electron blocking layer EBL3 and the third light-emitting layer EML3 can be formed using the same fine metal mask. For example, the first electron blocking layer EBL1, the second electron blocking layer EBL2, and the third electron blocking layer EBL3 can be made of different materials.

[0075] According to an embodiment of the present disclosure, a display panel is provided, such as Figure 3 As shown, the display panel also includes at least one of a hole injection layer HIL and a hole transport layer HTL. Both the hole injection layer HIL and the hole transport layer HTL are located on the side of the first light-emitting layer EML1 away from the electron transport layer ETL. The hole transport layer HTL is closer to the first light-emitting layer EML1 than the hole injection layer HIL.

[0076] According to a display panel provided by an embodiment of the present disclosure, Figure 3 and Figure 2 , the orthographic projection of the first light emitting layer EML1 on the base substrate, the orthographic projection of the second light emitting layer EML2 on the base substrate, and the orthographic projection of the third light emitting layer EML3 on the base substrate do not overlap, but the present invention is not limited thereto.

[0077] According to a display panel provided by an embodiment of the present disclosure, Figure 3 and Figure 2 , the orthographic projection of the first electron blocking layer EBL1 on the substrate BS, the orthographic projection of the second electron blocking layer EBL2 on the substrate BS, and the orthographic projection of the third electron blocking layer EBL3 on the substrate BS do not overlap, but the present invention is not limited thereto.

[0078] refer to Figure 3 and Figure 2The light emitting layer EML includes a first light emitting layer EML1, a second light emitting layer EML2 and a third light emitting layer EML3; the electron blocking layer EBL includes a first electron blocking layer EBL1, a second electron blocking layer EBL2 and a third electron blocking layer EBL3.

[0079] refer to Figure 3 and Figure 2 On the base substrate BS formed with the anode AN, the hole injection layer HIL, the hole transport layer HTL, the electron blocking layer EBL, the light emitting layer EML, the mixed material layer MML, the electron transport layer ETL and the cathode CT are stacked in sequence.

[0080] Figure 4A A schematic diagram of a partial layer structure of a display panel provided in an embodiment of the present disclosure. Figure 4A The display panel shown is Figure 3 Compared with the display panel shown in FIG. 1 , the mixed material layer MML does not contact the second light-emitting layer EML2 or the third light-emitting layer EML3. In this case, the influence of the mixed material layer MML on the second light-emitting device EMC2 and the third light-emitting device EMC3 can be minimized. Figure 4A As shown, the orthographic projection of the mixed material layer MML on the substrate BS does not overlap with the orthographic projection of the second light-emitting layer EML2 on the substrate BS, and the orthographic projection of the mixed material layer MML on the substrate BS does not overlap with the orthographic projection of the third light-emitting layer EML3 on the substrate BS. In this case, the mixed material layer MML can be formed using a fine metal mask. For example, the same fine metal mask can be used to sequentially form the first electron blocking layer EBL1, the first light-emitting layer EML1 and the mixed material layer MML. For example, Figure 4A As shown, the orthographic projection of the mixed material layer MML on the substrate BS overlaps with the orthographic projection of the first light-emitting layer EML1 on the substrate BS. Figure 4A As shown, the orthographic projection of the mixed material layer MML on the substrate BS coincides with the orthographic projection of the first light-emitting layer EML1 on the substrate BS.

[0081] Figure 4B A schematic diagram of a partial layer structure of a display panel provided in an embodiment of the present disclosure. Figure 4B The display panel shown is Figure 3Compared with the display panel shown in FIG. 1 , the mixed material layer MML and the first light-emitting layer EML1 are formed using the same mask and have the same pattern. A hole blocking layer HBL0 is provided between the second light-emitting layer EML2 and the electron transport layer ETL and between the third light-emitting layer EML3 and the electron transport layer ETL. For example, the hole blocking layer HBL0 is in contact with the mixed material layer MML, but is not limited thereto. For example, the hole blocking layer HBL0 may be formed using a common hole blocking material. For example, the material of the hole blocking layer HBL0 includes at least one of a triazine compound and bis(2-methyl-8-hydroxyquinoline)(4-1-biphenyloxy)aluminum (BAlq), but is not limited thereto.

[0082] At least one embodiment of the present disclosure further provides a display device, comprising any one of the above-mentioned display panels.

[0083] For example, the display device may include an OLED display and any product or component with a display function, such as a television, a digital camera, a mobile phone, a watch, a tablet computer, a laptop computer, a navigator, etc. including an OLED display.

[0084] At least one embodiment of the present disclosure further provides a method for manufacturing a display panel, referring to Figures 2 to 4B The manufacturing method includes: forming an electron transport layer ETL using an electron transport material; forming a first light-emitting layer EML1 using a first main material and a first doping material, and the first light-emitting layer EML1 is configured to emit a first color light; and forming a mixed material layer MML between the electron transport layer ETL and the first light-emitting layer EML1, the mixed material layer MML includes a first material and a second material, the first material is a main material for forming a light-emitting layer emitting the first color light, and the second material includes an electron transport material.

[0085] According to a manufacturing method provided by an embodiment of the present disclosure, the first material is the same as the first main material, but is not limited thereto.

[0086] According to a manufacturing method provided by an embodiment of the present disclosure, refer to Figure 2 and Figure 3 The electron transport layer ETL and the mixed material layer MML use the same electron transport material, but are not limited thereto.

[0087] According to a manufacturing method provided by an embodiment of the present disclosure, the mass ratio of the first material to the second material ranges from 3:7 to 7:3, but is not limited thereto.

[0088] According to a manufacturing method provided by an embodiment of the present disclosure, refer to Figure 2 and Figure 3 , the mixed material layer MML contacts the electron transport layer ETL, but is not limited thereto.

[0089] According to a manufacturing method provided by an embodiment of the present disclosure, refer to Figure 2 and Figure 3 , the mixed material layer MML contacts the first light emitting layer EML1, but is not limited thereto.

[0090] According to a manufacturing method provided by an embodiment of the present disclosure, refer to Figure 2 and Figure 3 , an open mask is used to form the mixed material layer MML, but is not limited thereto.

[0091] According to a manufacturing method provided by an embodiment of the present disclosure, refer to Figure 2 and Figure 3 The mixed material layer MML and the electron transport layer ETL are formed by using the same open mask.

[0092] The manufacturing method provided according to one embodiment of the present disclosure also includes forming a second light-emitting layer EML2 and forming a third light-emitting layer EML3, the second light-emitting layer EML2 is configured to emit a second color light, the third light-emitting layer EML3 is configured to emit a third color light, each two of the first color light, the second color light and the third color light are different, and the orthographic projection of the mixed material layer MML on the base substrate BS covers the orthographic projections of the first light-emitting layer EML1, the second light-emitting layer EML2 and the third light-emitting layer EML3 on the base substrate BS.

[0093] According to a manufacturing method provided in one embodiment of the present disclosure, the manufacturing method also includes forming a first electron blocking layer EBL1, forming a second electron blocking layer EBL2 and forming a third electron blocking layer EBL3, the first electron blocking layer EBL1 is formed on the side of the first light-emitting layer EML1 away from the electron transport layer ETL, the second electron blocking layer EBL2 is formed on the side of the second light-emitting layer EML2 away from the electron transport layer ETL, the third electron blocking layer EBL3 is formed on the side of the third light-emitting layer EML3 away from the electron transport layer ETL, the first electron blocking layer EBL1 and the first light-emitting layer EML1 are formed using the same fine metal mask, the second electron blocking layer EBL2 and the second light-emitting layer EML2 are formed using the same fine metal mask, and the third electron blocking layer EBL3 and the third light-emitting layer EML3 are formed using the same fine metal mask.

[0094] According to a manufacturing method provided by an embodiment of the present disclosure, refer to Figure 4A The first electron blocking layer EBL1, the first light emitting layer EML1 and the mixed material layer MML are formed by using the same fine metal mask.

[0095] According to a manufacturing method provided by an embodiment of the present disclosure, refer to Figure 3 , the production method comprises the following steps.

[0096] Step S11: forming a pixel driving circuit and an anode on a substrate. Figure 3 The pixel driving circuit is not shown in the figure, refer to the usual design).

[0097] Step S12: using an open mask to evaporate a hole injection layer HIL and a hole transport layer HTL.

[0098] Step S13: using a fine metal mask (FMM) to evaporate a first electron blocking layer EBL1 and a first light emitting layer EML1.

[0099] Step S14: using a fine metal mask to evaporate a second electron blocking layer EBL2 and a second light emitting layer EML2.

[0100] Step S15: using a fine metal mask to evaporate a third electron blocking layer EBL3 and a third light emitting layer EML3.

[0101] Step S16: using an open mask to evaporate the mixed material layer MML and the electron transport layer ETL.

[0102] Step S17: using an open mask to form a metal cathode.

[0103] According to a manufacturing method provided by an embodiment of the present disclosure, refer to Figure 4A , the production method comprises the following steps.

[0104] Step S21: forming a pixel driving circuit and an anode on a substrate. Figure 3 The pixel driving circuit is not shown in the figure, refer to the usual design).

[0105] Step S22 : using an open mask to evaporate a hole injection layer HIL and a hole transport layer HTL.

[0106] Step S23 : using a fine metal mask (FMM) to evaporate the first electron blocking layer EBL1 , the first light emitting layer EML1 and the mixed material layer MML.

[0107] Step S24 , using a fine metal mask to evaporate a second electron blocking layer EBL2 and a second light emitting layer EML2 .

[0108] Step S25 : using a fine metal mask to evaporate a third electron blocking layer EBL3 and a third light emitting layer EML3 .

[0109] Step S26 , using the open mask to evaporate the electron transport layer ETL.

[0110] Step S27: using an open mask to form a metal cathode.

[0111] For example, the thicknesses of the hole injection layer HIL and the hole transport layer HTL are 5-20 nm and 80-120 nm, respectively.

[0112] For example, the opening mask is a metal mask.

[0113] For example, the thickness of the first electron blocking layer EBL1 is 5-20 nm, but is not limited thereto.

[0114] For example, the thickness of the first light-emitting layer EML1 is 10-30 nm. For example, the first light-emitting layer EML1 includes a first host material (blue light host material) and a first doping material (blue light guest material), for example, the doping ratio of the first doping material is 2-10% (mass percentage), but is not limited thereto. In the embodiments of the present disclosure, the doping ratio of the doping material (guest material) refers to the ratio of the mass of the guest material to the sum of the mass of the guest material and the host material.

[0115] For example, the thickness of the second electron blocking layer EBL2 is 10-50 nm, but is not limited thereto.

[0116] For example, the thickness of the second light emitting layer EML2 is 20-50 nm, but not limited thereto. For example, the second light emitting layer EML2 includes a second host material (green host material) and a second doping material (green guest material), and for example, the doping ratio is 2-20% (mass percentage), but not limited thereto.

[0117] For example, the thickness of the third electron blocking layer EBL3 is 20-100 nm.

[0118] For example, the thickness of the third light emitting layer EML3 is 20-70 nm, and the third light emitting layer EML3 includes a third host material (red light host material) and a third doping material (red light guest material), for example, the doping ratio is 2-10% (mass percentage), but is not limited thereto.

[0119] For example, the thickness of the mixed material layer MML is 5-20 nm, but is not limited thereto. For example, the thickness of the electron transport ETL is 20-50 nm, but is not limited thereto.

[0120] In the display panels and manufacturing methods provided by some embodiments of the present disclosure, there is no need to re-modify the evaporation equipment. There is no difference between the evaporation chamber of the device structure in the conventional device structure and the device structure in the display panel provided by the embodiments of the present disclosure. There is no need to use conventional hole blocking materials, which reduces one material and facilitates material management.

[0121] In the display panels and manufacturing methods thereof provided by some embodiments of the present disclosure, when forming the mixed material layer MML, the first material may be the same material as the first main material forming the first light-emitting layer, and the second material may be the same electron transport material as the electron transport material of the electron transport layer ETL. Conventional evaporation equipment can be used without the need to add a chamber and an evaporation source.

[0122] For further example, when forming the mixed material layer, the evaporation angle of the evaporation source may be optimized.

[0123] For example, the material of the hole injection layer HIL may include any one or more of a triphenylamine compound and a P-type doped organic layer or polymer. For example, the material of the hole injection layer includes any one or more of tri-[4-(5-phenyl-2-thienyl)phenyl]amine, 4,4',4"-tri[2-naphthyl(phenyl)amino]triphenylamine (2-TNATA), 4,4',4"-tri-(3-methylphenylanilino)triphenylamine (m-MTDATA), copper phthalocyanine (CuPc), PEDOT:PSS and 4,4',4"-tri(N-3-methylphenyl-N-phenylamino)triphenylamine (F4TCNQ).

[0124] For example, the hole injection layer HIL can be a single-component film layer such as HATCN, CuPc, MoO3, etc., or it can be a doped film layer such as a cyclopentene or quinone compound doped with an aromatic amine compound, such as F4TCNQ doped with N,N'-bis(1-naphthyl)-N,N'-diphenyl-1,1'-diphenyl-4,4'-diamine (NPB) or N,N'-bis(3-methylphenyl)-N,N'-diphenyl-1,1'-diphenyl-4,4'-diamine (TPD).

[0125] For example, the HTL material of the hole transport layer includes 4,4'-N,N'-dicarbazole biphenyl (CBP), 4,4',4"-tris(carbazole-9-yl)triphenylamine (TcTa), 9,9'-(1,3-phenyl)di-9H-carbazole (mCP), N,N'-bis(1-naphthyl)-N,N'-diphenyl-1,1'-diphenyl-4,4'-diamine (NPB), 4,4',4"-tris(N-3-methylphenyl-N-phenylamino)triphenylamine (m-MTDATA), 4,4-2-[N-(4-carbazole phenyl)-N-phenylamino]biphenyl (CPB), N,N'-bis(3-methylphenyl)-N,N'-diphenyl-1,1'-diphenyl-4,4'-diamine (TPD), and any one or more of polyvinylcarbazole or its monomers.

[0126] For example, the hole transport layer HTL may include at least one of aromatic amine compounds such as NPB and TPD.

[0127] For example, the first electron blocking layer EBL1 may be a blue light electron blocking layer formed by using aromatic amine compounds.

[0128] For example, the first light-emitting layer EML1 is a blue light-emitting layer, and the first main material (blue light main material) of the first light-emitting layer EML1 includes anthracene derivatives, and the anthracene derivatives include at least one of ADN (9,10-di(naphthalene-2-yl)anthracene), TBADN (3-tert-butyl-9,10-di(naphthalene-2-yl)anthracene), and MADN (2-methyl-9,10-bis(naphthalene-2-yl)anthracene). The first host material is not limited to anthracene derivatives. For example, the first host material may also include at least one of Alq3 (tris(8-hydroxyquinoline)aluminum), CBP (4,4'-bis(N-carbazole)-1,1'-biphenyl), PVK (poly(N-vinylcarbazole)), TCTA (4,4',4"-tri(carbazole-9-yl)-triphenylamine), TPBi (1,3,5-tri(N-phenylbenzimidazole-2-yl)benzene), DSA (stilbene), and CDBP (4,4'-bis(9-carbazole)-2,2'-dimethyl-biphenyl). The first doping material (blue light guest material) includes pyrene derivatives and styrene derivatives, such as DPVBi, but is not limited thereto.

[0129] For example, the second electron blocking layer EBL2 may be a green light electron blocking layer, which may be formed by using aromatic amine compounds.

[0130] For example, the second light-emitting layer EML2 may be a green light-emitting layer, the first host material of the second light-emitting layer EML2 includes carbazole derivatives TCP, CBP, etc., and the second doping material (green light guest material) includes iridium metal complex Ir(ppy)3.

[0131] For example, the third electron blocking layer EBL3 may be a red light electron blocking layer, and the third electron blocking layer EBL3 may be formed of an aromatic amine compound.

[0132] For example, the third light-emitting layer EML3 may be a red light-emitting layer, the first host material of the third light-emitting layer EML3 includes carbazole derivatives TCP, CBP, etc., and the third doping material (green light guest material) includes Ir(ppy)2(acac), etc.

[0133] For example, the electron transport layer ETL material may include: 4,6-bis(3,5-di(3-pyridyl)phenyl-2-methylpyrimidine) (B3PymPm), 4,7-diphenyl-1,10-phenanthroline (BPhen), 8-hydroxyquinoline aluminum (Alq3), 8-hydroxyquinoline lithium (Liq), 8-hydroxyquinoline gallium, bis[2-(2-hydroxyphenyl-1)-pyridine]beryllium, 2-(4-diphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD) and 1,3,5-tri(N-phenyl-2-benzimidazole-2)benzene (TPBi) at least one.

[0134] For example, the electron transport layer ETL includes a mixed film of an electron transport material and lithium octahydroxyquinoline (Liq), and the electron transport material includes a nitrogen-containing heterocyclic compound such as Bphen, TPBi, etc., but is not limited thereto.

[0135] For example, the mixed material layer MML is a mixed layer of a blue light host material and an electron transport material.

[0136] For example, the electron blocking layer EBL may include at least one of 4,4′,4′-tri(carbazol-9-yl)triphenylamine (TCTA) and 3,3′-di(N-carbazolyl)-1,1′-biphenyl (mCBP).

[0137] For example, the light-emitting layer can emit red light, green light, blue light, yellow light, white light, etc., depending on the different organic light-emitting materials used. The organic light-emitting material includes any one of a fluorescent light-emitting material or a phosphorescent light-emitting material. For example, a doping system can be used, that is, a doping material is mixed into a main light-emitting material to obtain a usable light-emitting layer material. For example, phosphorescent light-emitting materials include light-emitting materials based on metal complexes such as Ir, Pt, Ru, and Cu. For example, the red phosphorescent material includes any one of octaethylporphyrin platinum (PtOEP), bis(2-(2'-benzothienyl)pyridine-N,C3')(acetylacetonate)iridium complex [(btp)2Ir(acac)], tris(dibenzoylmethane)mono(phenanthroline)europium(III) [Eu(dbm)3(Phen)], tris[1-phenylisoquinoline-C2,N]iridium(III) (Ir(piq)3), and bis(1-phenylisoquinoline)(acetylacetonate)iridium(III) [Ir(piq)2(acac)]. For example, green phosphorescent materials include any one of tris(2-phenylpyridine)iridium (Ir(ppy)3), di(2-phenylpyridine)iridium acetylacetonate [Ir(ppy)2(acac)], tris(2-phenylpyridine)iridium (III) (Ir(mppy)3), di(2-phenylpyridine)iridium acetylacetonate [Ir(FPP)2(acac)], and tris(2-phenylpyridine)iridium (Ir(Bu-ppy)3). In addition, the luminescent material may also include a dual host and be doped.

[0138] The molecular formulas of HATCN, CuPc, F4TCNQ, NPB, TPD, TCP, CBP, Ir(ppy)3, Ir(ppy)2(acac), ADN, and DPVBi among the optional materials are given below. These materials are commonly used materials known in the art.

[0139]

[0140]

[0141] For example, in an embodiment of the present disclosure, the first material may be an anthracene derivative, and the anthracene derivative includes at least one of ADN (9,10-di(naphthalene-2-yl)anthracene), TBADN (3-tert-butyl-9,10-di(naphthalene-2-yl)anthracene), and MADN (2-methyl-9,10-bis(naphthalene-2-yl)anthracene), but is not limited thereto. The first material is not limited to anthracene derivatives, for example, the first material may also include at least one of Alq3 (tris(8-hydroxyquinoline)aluminum), CBP (4,4'-bis(N-carbazole)-1,1'-biphenyl), PVK (poly(N-vinylcarbazole)), TCTA (4,4',4"-tri(carbazole-9-yl)-triphenylamine), TPBi (1,3,5-tri(N-phenylbenzimidazole-2-yl)benzene), DSA (stilbene), and CDBP (4,4'-bis(9-carbazole)-2,2'-dimethyl-biphenyl).

[0142] For example, the second material may be an electron transport material, and the electron transport material includes at least one of 4,6-bis(3,5-di(3-pyridyl)phenyl-2-methylpyrimidine) (B3PymPm), 4,7-diphenyl-1,10-phenanthroline (BPhen), 8-hydroxyquinoline aluminum (Alq3), 8-hydroxyquinoline lithium (Liq), 8-hydroxyquinoline gallium, bis[2-(2-hydroxyphenyl-1)-pyridine]beryllium, 2-(4-diphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD) and 1,3,5-tri(N-phenyl-2-benzimidazole-2)benzene (TPBi), but is not limited thereto. For example, the second material may be a nitrogen-containing heterocyclic compound, and the nitrogen-containing heterocyclic compound includes at least one of Bphen and TPBi, but is not limited thereto.

[0143] It should be noted that the materials used in the various layers given above are only examples, and those skilled in the art can select other suitable materials based on the description of the embodiments of the present disclosure and the performance required of each layer. The embodiments of the present disclosure do not limit the specific materials of each layer.

[0144] For the sake of clarity, several tables are given below to illustrate different light emitting devices and their composition and performance.

[0145] Table 1 shows eight different light emitting devices and their compositions. Device 1, device 5 and device 7 use Figure 1 The hole blocking layer HBL shown in the figure, the other devices use the mixed material layer MML. In Table 1, HBL uses BAlq, the hole injection layer HIL uses MoO3, the hole transport layer HTL uses NPB, the electron blocking layer EBL uses mCBP, the first light-emitting layer EML1 uses ADN and DPVBi, the second light-emitting layer EML2 uses CBP and Ir(ppy)3, the third light-emitting layer EML3 uses TCP and Ir(ppy)2(acac), the mixed material layer MML uses ADN and Bphen, the electron transport layer ETL uses a mixed film of Bphen and octahydroxyquinoline lithium (LiQ), and the cathode CT uses Mg:Ag. In each device, the anode uses indium tin oxide.

[0146] The display panel provided by the embodiment of the present disclosure is a display panel of a light-emitting device containing a mixed material layer MML. The structure of the display panel can be referred to Figure 2 or Figure 3 shown.

[0147] In Tables 1 to 4, BH represents blue light host material, and ET represents electron transport material. The ratios of the two materials in the table are all weight ratios.

[0148] It can be seen from Table 1 that the thickness of the mixed material layer MML is smaller than the thickness of any one of the first light emitting layer EML1, the second light emitting layer EML2 and the third light emitting layer EML3. The thickness of the mixed material layer MML is smaller than the thickness of the electron transport layer ETL.

[0149] It can be seen from Tables 1 and 2 that when the mass ratio of the blue light host material (BH) to the electron transport material (ET) is in the range of 3:7 to 7:3, the life of the blue light emitting device is significantly improved, and the voltage and efficiency do not change much. When the mass ratio of the first material to the second material is 5:5 or 1:1, the life of the blue light emitting device is improved to the greatest extent.

[0150] It can be seen from Tables 1 and 3 that when the mass ratio of the blue light host material (BH) to the electron transport material (ET) is 5:5, the setting of the mixed material layer has little effect on the changes in the life, voltage and efficiency of the green light-emitting device.

[0151] It can be seen from Tables 1 and 4 that when the mass ratio of the blue light host material (BH) to the electron transport material (ET) is 5:5, the setting of the mixed material layer has little effect on the changes in the life, voltage and efficiency of the red light-emitting device.

[0152] Table 1: Eight different light-emitting devices and their composition

[0153]

[0154] Table 2: Performance comparison of blue light-emitting devices using a mixed material layer of the first material and the second material with different mass ratios and a blue light-emitting device using a hole blocking layer

[0155] structure Voltage efficiency life Device 1 HBL 100％ 100％ 100％ Device 2 BH:ET(3:7) 102％ 94％ 170％ Device 3 BH:ET(5:5) 99％ 96％ 230％ Device 4 BH:ET(7:3) 98％ 96％ 210％

[0156] Table 3: Performance comparison of green light-emitting devices using a mixed material layer of the first material and the second material with different mass ratios and a green light-emitting device using a hole blocking layer

[0157] structure Voltage efficiency life Device 5 HBL 100％ 100％ 100％ Device 6 BH:ET(5:5) 100％ 98％ 100％

[0158] Table 4: Performance comparison of red light-emitting devices using a mixed material layer of the first material and the second material with different mass ratios and a red light-emitting device using a hole blocking layer

[0159] structure Voltage efficiency life Device 7 HBL 100％ 100％ 100％ Device 8 BH:ET(5:5) 100％ 99％ 100％

[0160] Figure 5 This is a graph showing the relationship between the life of a blue light device and time. Figure 6 This is a graph showing the relationship between the life of a green light device and time. Figure 7 This is the relationship between the life of the red light device and time. Figures 5 to 7 As shown, when continuously lit for 200 hours, the life of the blue light device in the display panel provided by the embodiment of the present disclosure is greatly improved compared with device 1, while the life of the red light device and the green light device in the display panel provided by the embodiment of the present disclosure is basically unchanged. That is, the structure of the display panel provided by the embodiment of the present disclosure greatly improves the life of the blue light device, while having basically no effect on the life of the red light device and the green light device.

[0161] It should be noted that, for the sake of clarity, in the drawings used to describe the embodiments of the present disclosure, the thickness of the layer or region is exaggerated. It is understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "under" another element, the element may be "directly" "on" or "under" the other element, or there may be an intermediate element.

[0162] In the embodiments of the present disclosure, the shapes of various elements are only schematically described and are not limited to those shown in the drawings and may be determined according to needs.

[0163] In the absence of conflict, features in the same embodiment and different embodiments of the present disclosure may be combined with each other.

[0164] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A display panel, comprising: an electron transport layer, including an electron transport material; A first light-emitting layer, configured to emit light of a first color, the first light-emitting layer comprising a first host material and a first doping material; as well as a mixed material layer, located between the electron transport layer and the first light-emitting layer, The mixed material layer includes a first material and a second material, the first material is a main material for forming a light-emitting layer emitting the first color light, and the second material includes an electron transport material. The display panel further includes a second light emitting layer, wherein the second light emitting layer is configured to emit a second color light, and the second color light is different from the first color light. The display panel further includes a third light emitting layer, wherein the third light emitting layer is configured to emit a third color light, and each two of the first color light, the second color light and the third color light are different, The electron transport layer is in contact with the second light-emitting layer and the third light-emitting layer, and the mixed material layer is in contact with neither the second light-emitting layer nor the third light-emitting layer.

2. The display panel according to claim 1, wherein: The first material is the same as the first host material.

3. The display panel according to claim 1, wherein: The second material of the mixed material layer and the electron transport material of the electron transport layer are the same.

4. The display panel according to any one of claims 1 to 3, wherein: The mass ratio of the first material to the second material ranges from 3:7 to 7:

3.

5. The display panel according to any one of claims 1 to 3, wherein: The mass ratio of the first material to the second material is 1:

1.

6. The display panel according to any one of claims 1 to 3, wherein: The mixed material layer is in contact with the electron transport layer.

7. The display panel according to any one of claims 1 to 3, wherein: The mixed material layer is in contact with the first light-emitting layer.

8. The display panel according to any one of claims 1 to 3, further comprising a base substrate, wherein: The orthographic projection of the mixed material layer on the base substrate covers the orthographic projection of the first light-emitting layer on the base substrate.

9. The display panel according to claim 8, wherein: The orthographic projection of the mixed material layer on the base substrate does not overlap with the orthographic projection of the second light-emitting layer on the base substrate, and the orthographic projection of the mixed material layer on the base substrate does not overlap with the orthographic projection of the third light-emitting layer on the base substrate.

10. The display panel according to any one of claims 1 to 3, further comprising a first electron blocking layer, a second electron blocking layer and a third electron blocking layer, wherein: The first electron blocking layer is located on a side of the first light-emitting layer away from the electron transport layer, the second electron blocking layer is located on a side of the second light-emitting layer away from the electron transport layer, the third electron blocking layer is located on a side of the third light-emitting layer away from the electron transport layer, the orthographic projection of the first electron blocking layer on the substrate coincides with the orthographic projection of the first light-emitting layer on the substrate, the orthographic projection of the second electron blocking layer on the substrate coincides with the orthographic projection of the second light-emitting layer on the substrate, and the orthographic projection of the third electron blocking layer on the substrate coincides with the orthographic projection of the third light-emitting layer on the substrate. 11 . The display panel according to claim 1 , further comprising a cathode located on a side of the electron transport layer away from the first light emitting layer and an anode located on a side of the first light emitting layer away from the electron transport layer.

12. The display panel according to any one of claims 1 to 3, further comprising at least one of a hole injection layer and a hole transport layer, wherein: The hole injection layer and the hole transport layer are both located on a side of the first light-emitting layer away from the electron transport layer, and the hole transport layer is closer to the first light-emitting layer than the hole injection layer.

13. The display panel according to any one of claims 1 to 3, wherein: The first color light includes blue light.

14. The display panel according to any one of claims 1 to 3, wherein: The mixed material layer is reused as a hole blocking layer.

15. A display device comprising the display panel according to any one of claims 1 to 14.

16. A method for manufacturing a display panel, comprising: forming an electron transport layer using an electron transport material; A first light-emitting layer is formed using a first host material and a first doping material, wherein the first light-emitting layer is configured to emit light of a first color; as well as forming a mixed material layer between the electron transport layer and the first light emitting layer, The mixed material layer includes a first material and a second material, the first material is a main material for forming a light-emitting layer emitting the first color light, and the second material includes an electron transport material. The method further includes forming a second light emitting layer, wherein the second light emitting layer is configured to emit a second color light, the second color light being different from the first color light, The method further includes forming a third light emitting layer, wherein the third light emitting layer is configured to emit a third color light, and each two of the first color light, the second color light, and the third color light are different. The electron transport layer is in contact with the second light-emitting layer and the third light-emitting layer, and the mixed material layer is in contact with neither the second light-emitting layer nor the third light-emitting layer.

17. The method according to claim 16, wherein: The first material is the same as the first host material.

18. The method according to claim 16, wherein: The electron transport layer and the mixed material layer use the same electron transport material.

19. The production method according to any one of claims 16 to 18, wherein: The mass ratio of the first material to the second material ranges from 3:7 to 7:

3.

20. The production method according to any one of claims 16 to 18, wherein: The mass ratio of the first material to the second material is 1:

1.

21. The method according to any one of claims 16 to 18, wherein: The mixed material layer is in contact with the electron transport layer.

22. The method according to any one of claims 16 to 18, wherein: The mixed material layer is in contact with the first light-emitting layer.

23. The manufacturing method according to any one of claims 16 to 18, wherein the first color light comprises blue light, the second color light comprises green light, and the third color light comprises red light.

24. The manufacturing method according to any one of claims 16 to 18, further comprising forming a first electron blocking layer, forming a second electron blocking layer and forming a third electron blocking layer, wherein: The first electron blocking layer is formed on a side of the first light-emitting layer away from the electron transport layer, the second electron blocking layer is formed on a side of the second light-emitting layer away from the electron transport layer, the third electron blocking layer is formed on a side of the third light-emitting layer away from the electron transport layer, the first electron blocking layer and the first light-emitting layer are formed using the same fine metal mask, the second electron blocking layer and the second light-emitting layer are formed using the same fine metal mask, and the third electron blocking layer and the third light-emitting layer are formed using the same fine metal mask.

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