Display panel and display apparatus

Abstract

Disclosed in the present application are a display panel and a display apparatus. The display panel comprises a substrate, a first electrode layer, a hole injection layer, a hole transport layer, a first light-emitting layer, an electron transport layer, an electron injection layer and a second electrode layer, which are arranged in a stacked manner, wherein the electron transport layer is doped with a first doping material; the electron injection layer is doped with a second doping material and a third doping material; and the second doping material comprises a metal material, and the third doping material comprises a complex, which is formed by means of a metal material and a second organic material.

Description

Display panel and display device

[0001] This application claims priority to Chinese patent application No. 202410065285.0 filed on January 16, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present application belongs to the field of display technology, and specifically relates to a display panel and a display device. Background Art

[0003] Compared with liquid crystal display panels, organic light emitting diode (OLED) display panels have the advantages of being thinner and lighter, having better display effects, higher resolution, wider color gamut, lower power consumption, and flexible display. As a result, they have developed rapidly in recent years and have become the preferred display panel type for mobile terminals.

[0004] In a traditional OLED display panel, an electron injection layer (EIL) and an electron transport layer (ETL) are stacked in sequence on the side of the second electrode layer (such as the cathode) facing the first electrode layer (such as the anode). The second electrode layer can be made of a mixture of silver (Ag) and magnesium (Mg), and the doping material in the electron transport layer is a metal material. However, due to the large sheet resistance of the second electrode layer and the defects of the electron transport layer formed by the metal material, the voltage drop of the second electrode layer of the OLED display panel is large, resulting in high overall power consumption of the OLED display panel. Therefore, how to improve the structure of the OLED display panel to reduce the voltage drop of its second electrode layer and reduce power consumption is an urgent problem that technicians in this field need to solve. SUMMARY OF THE INVENTION

[0005] The embodiments of the present application provide a display panel and a display device, which can effectively solve the problems of large voltage drop in the second electrode layer of the existing display panel and high power consumption of the display panel.

[0006] In a first aspect, the present application provides a display panel, comprising:

[0007] substrate;

[0008] A first electrode layer is provided on one side of the substrate,

[0009] a hole injection layer, disposed on a side of the first electrode layer away from the substrate;

[0010] a hole transport layer, disposed on a side of the hole injection layer away from the substrate;

[0011] A first light-emitting layer is provided on a side of the hole transport layer away from the substrate;

[0012] an electron transport layer, disposed on a side of the first light-emitting layer away from the substrate;

[0013] an electron injection layer, disposed on a side of the electron transport layer away from the substrate;

[0014] a second electrode layer, disposed on a side of the electron injection layer away from the substrate;

[0015] The electron transport layer comprises a first organic material layer having electron transport capability and a first doping material doped in the first organic material layer; the electron injection layer comprises a second organic material layer having electron transport capability and a second doping material and a third doping material doped in the second organic material layer;

[0016] The second doping material includes a metal material, and the third doping material includes a complex of the metal material formed by the metal material and a second organic material.

[0017] In a second aspect, the present application provides a display device, comprising a housing and the display panel described above, wherein the housing has an accommodating space, and the display panel is disposed in the accommodating space. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0019] FIG1 is a schematic cross-sectional view of a display panel provided in some embodiments of the present application.

[0020] FIG2 is a schematic cross-sectional view of an electron transport layer and an electron injection layer provided in some embodiments of the present application.

[0021] FIG3 a is a schematic cross-sectional view of a second electrode layer provided in some embodiments of the present application.

[0022] FIG3 b is a schematic cross-sectional view of another second electrode layer provided in some embodiments of the present application.

[0023] FIG4 is a schematic cross-sectional view of another display panel provided in some embodiments of the present application.

[0024] Explanation of the accompanying drawings: 10. substrate; 11. first electrode layer; 12. hole injection layer; 13. hole transport layer; 14. first light-emitting layer; 15. electron transport layer; 151. first organic material layer; 16. electron injection layer; 161. second organic material layer; 1621. first part; 1622. second part; 17. second electrode layer; 171. first sublayer; 172. second sublayer; 18. second hole transport layer; 19. second light-emitting layer; 20. second electron transport layer; 21. first type charge generation layer; 22. second type charge generation layer. Modes for Carrying Out the Invention

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; and "inside" and "outside" refer to the outline of the device.

[0026] The disclosure below provides many different embodiments or examples for realizing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, examples of various specific processes and materials are provided in the present application, but a person of ordinary skill in the art will recognize the application of other processes and / or the use of other materials. Each of the following is described in detail. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments.

[0027] Example 1

[0028] FIG1 is a schematic cross-sectional view of a display panel provided in some embodiments of the present application; FIG2 is a schematic cross-sectional view of an electron transport layer provided in some embodiments of the present application. In combination with FIG1 and FIG2 , in a first aspect, an embodiment of the present application provides a display panel, the display panel comprising a substrate 10, a first electrode layer 11, a hole injection layer 12, a hole transport layer 13, a first light-emitting layer 14, an electron transport layer 15, an electron injection layer 16, and a second electrode layer 17. The first electrode layer 11 is arranged on one side of the substrate 10; the hole injection layer 12 is arranged on a side of the first electrode layer 11 away from the substrate 10; the hole transport layer 13 is arranged on a side of the hole injection layer 12 away from the substrate 10; the first light-emitting layer 14 is arranged on a side of the hole transport layer 13 away from the substrate 10; the electron transport layer 15 is arranged on a side of the first light-emitting layer 14 away from the substrate 10; the electron injection layer 16 is arranged on a side of the electron transport layer 15 away from the substrate 10; and the second electrode layer 17 is arranged on a side of the electron injection layer 16 away from the substrate 10. The electron transport layer 15 includes a first organic material layer 151 having an electron transport capability, and a first dopant material doped in the first organic material layer 151. The electron injection layer 16 includes a second organic material layer 161 having an electron transport capability, and a second dopant material and a third dopant material doped in the second organic material layer 161. The second dopant material includes a metal material, and the third dopant material includes a complex of the metal material formed by the metal material and a second organic material.

[0029] In the display panel provided herein, the electron injection layer 16 disposed between the electron transport layer 15 and the second electrode layer 17 includes not only a second organic material layer 161 having electron transport capability, but also a second doping material and a third doping material doped in the second organic material layer 161. The metal material in the second doping material is in an atomic state and has a relatively low energy level, enabling electron injection, thereby significantly improving the injection efficiency of electrons provided by the second electrode layer 17 to the first light-emitting layer 14. The third doping material comprises a complex formed by the metal material in the second doping material and a second organic material (i.e., the substrate of the second organic material layer 161). The complex of the metal material has an energy level different from that of the metal material and is capable of electron transport, thereby significantly improving the transmission efficiency of electrons provided by the second electrode layer 17 to the first light-emitting layer 14. This can alleviate the problem of a large voltage drop caused by the excessively large sheet resistance of the second electrode layer 17 (e.g., the cathode), thereby reducing the power consumption of the display panel.

[0030] 2 , in some embodiments of the present application, the second organic material layer 161 includes a first portion 1621 and a second portion 1622. The first portion 1621 is disposed on a side of the second portion 1622 away from the second electrode layer 17, and the electron transport layer 15 is disposed on a side of the first portion 1621 away from the second portion 1622. The third doping material is doped in the first portion 1621, and the second doping material is doped in the second portion 1622. The lowest unoccupied molecular orbital energy level of the third doping material is greater than the lowest unoccupied molecular orbital energy level of the second doping material.

[0031] In the display panel provided in the present application, the first portion 1621 is arranged on the side of the second portion 1622 away from the second electrode layer 17, and the electron transport layer 15 is arranged on the side of the first portion 1621 away from the second portion 1622. That is, the second portion 1622 is closer to the second electrode layer 17, and the first portion 1621 is closer to the electron transport layer 15. As mentioned above, since the metal material in the second doping material is in an atomic state, its corresponding energy level is low and can play a role in electron injection. Therefore, when the second doping material doped in the second portion 1622 is closer to the second electrode layer 17, the injection efficiency of electrons provided by the second electrode layer 17 to the first light-emitting layer 14 can be further improved. Since the third doping material is doped in the first portion 1621, and the third doping material includes a complex of the metal material, the energy level of the complex of the metal material is different from that of the metal material, and can play a role in electron transport. Therefore, when the third doping material doped in the first portion 1621 is closer to the electron transport layer 15 , the transport efficiency of electrons provided by the second electrode layer 17 to the first light-emitting layer 14 can be further improved.

[0032] In some embodiments of the present application, the lowest unoccupied molecular orbital energy level of the complex of the metal material is greater than the lowest unoccupied molecular orbital energy level of the metal material.

[0033] In the display panel provided in the present application, since the lowest unoccupied molecular orbital energy level of the complex of the metal material is greater than the lowest unoccupied molecular orbital energy level of the metal material, that is, the lowest unoccupied molecular orbital energy level of the metal material is lower than the lowest unoccupied molecular orbital energy level of the complex of the metal material, the injection efficiency and transmission efficiency of electrons provided by the second electrode layer 17 to the first light-emitting layer 14 can be further improved.

[0034] In some embodiments of the present application, the metal material is dispersed in the second portion 1622 .

[0035] In the display panel provided by this application, the applicant has found that when the metal material is a specific low-cost metal material (such as Yb), blue light absorption is likely to occur, thereby reducing the luminous efficiency of the blue sub-pixel. Therefore, this application disperses the metal material in the second part 1622, thereby minimizing the amount of blue light absorbed by the metal material and improving the luminous efficiency of the blue sub-pixel in the display panel. It should be noted that the role of the dispersed arrangement of the metal material in the second part 1622 is not limited to reducing the metal material's absorption of the blue light band, but can also be used to reduce the metal material's absorption of other bands, and the metal material is not limited to Yb.

[0036] In some embodiments of the present application, the doping concentration of the metal material in the second portion 1622 is 1%-7%.

[0037] In the display panel provided by this application, the applicant has discovered that when the doping concentration of the metal material is too low, it directly affects the concentration of the second doping material in the second portion 1622, thereby affecting the injection efficiency of electrons provided by the second electrode layer 17 to the first light-emitting layer 14. When the doping concentration of the metal material is too high, the device stability of the display panel at high temperatures is reduced, the dispersion of the metal material in the second portion 1622 is reduced, and the luminous efficiency of the display panel is reduced. By setting the doping concentration of the metal material in the second portion 1622 to 1%-7%, this application is able to improve the device stability and luminous efficiency of the display panel at high temperatures while maintaining the injection efficiency of electrons provided by the second electrode layer 17 to the first light-emitting layer 14.

[0038] In some embodiments of the present application, the second electrode layer 17 includes at least one metal, and the lowest unoccupied molecular orbital energy level of the metal material is lower than the lowest unoccupied molecular orbital energy level of any metal in the second electrode layer 17 .

[0039] In the display panel provided in the present application, since the lowest unoccupied molecular orbital energy level of the metal material is lower than the lowest unoccupied molecular orbital energy level of any metal in the second electrode layer 17, the energy level barrier in the electron transmission process can be reduced, thereby improving the device performance of the display panel.

[0040] Figure 3a is a schematic cross-sectional view of a second electrode layer according to some embodiments of the present application; Figure 3b is a schematic cross-sectional view of another second electrode layer according to some embodiments of the present application. Referring to Figures 3a and 3b, in some embodiments of the present application, the second electrode layer 17 includes a first sublayer 171, which is made of a mixture of magnesium and silver.

[0041] As shown in FIG3 a , in the display panel provided by the present application, since the material of the first sublayer 171 is a mixture of magnesium and silver, the sheet resistance of the second electrode layer 17 is relatively large. Furthermore, by providing a second organic material layer 161 having electron transport capability and an electron injection layer 16 doped with a second doping material and a third doping material in the second organic material layer 161, the present application can effectively alleviate the problem of a large voltage drop and high power consumption of the display panel caused by the large sheet resistance of the second electrode layer 17.

[0042] 3 b , in some embodiments of the present application, the second electrode layer 17 further includes a second sub-layer 172 , and the material of the second sub-layer 172 is silver.

[0043] In the display panel provided herein, since the second electrode layer 17 further includes a second sublayer 172 made of silver, the square resistance of the second electrode layer 17 can be reduced, thereby reducing the power consumption of the display panel. Specifically, the second sublayer 172 is disposed on the side of the first sublayer 171 facing away from the substrate 10.

[0044] In some embodiments of the present application, the absolute value of the difference between the lowest unoccupied molecular orbital energy level of the electron transport layer 15 and the lowest unoccupied molecular orbital energy level of the electron injection layer 16 is 0 eV to 0.5 eV.

[0045] In the display panel provided by the present application, the present application controls the absolute value of the difference between the lowest unoccupied molecular orbital energy level of the electron transport layer 15 and the lowest unoccupied molecular orbital energy level of the electron injection layer 16 to be between 0eV and 0.5eV, thereby further reducing the energy level barrier in the electron transport process and improving the device performance of the display panel.

[0046] In some embodiments of the present application, the sum of the thicknesses of the electron transport layer 15 and the electron injection layer 16 is 15 μm to 40 μm.

[0047] In the display panel provided in the present application, the display panel is an OLED display panel. When the sum of the thicknesses of the first electron transport layer 15 and the second electron transport layer 20 is 15 μm to 40 μm, the total thickness of the electron transport layer 15 and the electron injection layer 16 matches the effective thickness of the light-emitting microcavity of the first light-emitting layer 14 in the OLED display panel, thereby improving the luminous efficiency of the display panel.

[0048] In some embodiments of the present application, the first light-emitting layer 14 includes a cavity length adjustment layer and a light-emitting unit layer, the cavity length adjustment layer is arranged on a side of the light-emitting unit layer away from the second electrode layer 17, the light-emitting unit layer includes a plurality of first light-emitting units, a plurality of second light-emitting units and a plurality of third light-emitting units, and the first light-emitting units, the second light-emitting units and the third light-emitting units have different light-emitting colors.

[0049] In some embodiments of the present application, the first organic material layer 151 includes a first organic material, the second organic material layer 161 includes a second organic material, the first organic material and the second organic material are different, and the first organic material and the second organic material each independently include at least one selected from the following groups: pyridine derivatives, pyrimidine derivatives, triazine derivatives, imidazole derivatives, oxazole derivatives, and phenanthroline derivatives.

[0050] In some embodiments of the present application, the first doping material is lithium quinoline, the second doping material is different from the first doping material, the metal material in the second doping material is an active metal, such as alkali metals, alkaline earth metals, lanthanides, and actinides, such as Yb, Li, Cs, etc., and the third doping material is a complex of the active metal.

[0051] In a second aspect, an embodiment of the present application further provides a display device, comprising a housing and a display panel as described above, wherein the housing has an accommodating space, and the display panel is disposed in the accommodating space.

[0052] Example 2

[0053] FIG4 is a cross-sectional schematic diagram of another display panel provided in some embodiments of the present application. Referring to FIG4 , in a first aspect, an embodiment of the present application provides a display panel, the display panel comprising a substrate 10, a first electrode layer 11, a hole injection layer 12, a hole transport layer 13, a first light-emitting layer 14, an electron transport layer 15, an electron injection layer 16, and a second electrode layer 17. The first electrode layer 11 is arranged on one side of the substrate 10; the hole injection layer 12 is arranged on a side of the first electrode layer 11 away from the substrate 10; the hole transport layer 13 is arranged on a side of the hole injection layer 12 away from the substrate 10; the first light-emitting layer 14 is arranged on a side of the hole transport layer 13 away from the substrate 10; the electron transport layer 15 is arranged on a side of the first light-emitting layer 14 away from the substrate 10; the electron injection layer 16 is arranged on a side of the electron transport layer 15 away from the substrate 10; and the second electrode layer 17 is arranged on a side of the electron injection layer 16 away from the substrate 10. The electron transport layer 15 includes a first organic material layer 151 having electron transport capability and a first dopant doped in the first organic material layer 151. The electron injection layer 16 includes a second organic material layer 161 having electron transport capability and a second dopant and a third dopant doped in the second organic material layer 161. The second dopant includes a metal material, and the third dopant includes a complex of the metal material formed by the metal material and a second organic material.

[0054] It should be noted that the structure of the display panel provided in the second embodiment of the present application is similar to the structure of the display panel provided in the first embodiment of the present application, and the same parts will not be described in detail in the second embodiment of the present application.

[0055] In some embodiments of the present application, the display panel further includes a second hole transport layer 18, a second light-emitting layer 19, a second electron transport layer 20, a first type charge generation layer 21, and a second type charge generation layer 22. The second hole transport layer 18 is arranged on a side of the hole injection layer 12 away from the substrate 10, the second light-emitting layer 19 is arranged on a side of the second hole transport layer 18 away from the substrate 10, the second electron transport layer 20 is arranged on a side of the second light-emitting layer 19 away from the substrate 10, the first type charge generation layer 21 is arranged on a side of the second electron transport layer 20 away from the substrate 10, the second type charge generation layer 22 is arranged on a side of the first type charge generation layer 21 away from the substrate 10, and the hole transport layer 13 is arranged on a side of the second type charge generation layer 22 away from the substrate 10.

[0056] In the display panel provided in the present application, since the display panel also includes a second hole transport layer 18, a second light-emitting layer 19, a second electron transport layer 20, a first type charge generation layer 21, and a second type charge generation layer 22 which are stacked in sequence, the first type charge generation layer 21 is used to provide electrons to the second light-emitting layer 19, and the second type charge generation layer 22 is used to provide holes to the first light-emitting layer 14, so that the first light-emitting layer 14 and the second light-emitting layer 19 can realize composite light emission to form a stacked display panel device, thereby extending the service life of the display panel.

[0057] In a second aspect, an embodiment of the present application further provides a display device, comprising a housing and a display panel as described above, wherein the housing has an accommodating space, and the display panel is disposed in the accommodating space.

[0058] In summary, the present application provides a display panel and a display device, wherein the display panel includes: a substrate; a first electrode layer disposed on one side of the substrate; a hole injection layer disposed on a side of the first electrode layer away from the substrate; a hole transport layer disposed on a side of the hole injection layer away from the substrate; a first light-emitting layer disposed on a side of the hole transport layer away from the substrate; an electron transport layer disposed on a side of the first light-emitting layer away from the substrate; an electron injection layer disposed on a side of the electron transport layer away from the substrate; and a second electrode layer disposed on a side of the electron injection layer away from the substrate. The electron transport layer includes a first organic material layer having electron transport capability and a first doping material doped in the first organic material layer; the electron injection layer includes a second organic material layer having electron transport capability and a second doping material and a third doping material doped in the second organic material layer. The second doping material includes a metal material, and the third doping material includes a complex of the metal material formed by the metal material and the second organic material. In the display panel provided by the present application, the electron injection layer disposed between the electron transport layer and the second electrode layer includes not only a second organic material layer having electron transport capability, but also a second doping material and a third doping material doped in the second organic material layer. The metal material in the second doping material is in an atomic state and has a relatively low corresponding energy level, which can act as an electron injector, thereby significantly improving the injection efficiency of electrons provided by the second electrode layer to the first light-emitting layer. The third doping material includes a complex formed by the metal material in the second doping material and a second organic material (i.e., the substrate of the second organic material layer). The energy level of the complex of the metal material is different from that of the metal material, which can act as an electron transporter, thereby significantly improving the transmission efficiency of electrons provided by the second electrode layer to the first light-emitting layer. This can improve the problem of a large voltage drop caused by the excessively large square resistance of the second electrode layer (e.g., the cathode), thereby reducing the power consumption of the display panel.

[0059] The above is a detailed introduction to a display panel and a display device provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, based on the ideas of the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A display panel, the display panel comprising: a substrate; a first electrode layer disposed on one side of the substrate; a hole injection layer disposed on a side of the first electrode layer away from the substrate; a hole transport layer disposed on a side of the hole injection layer away from the substrate; a first light-emitting layer disposed on a side of the hole transport layer away from the substrate; an electron transport layer disposed on a side of the first light-emitting layer away from the substrate; an electron injection layer disposed on a side of the electron transport layer away from the substrate; a second electrode layer disposed on a side of the electron injection layer away from the substrate; wherein, the electron transport layer includes a first organic material layer having electron transport ability and a first doping material doped in the first organic material layer; the electron injection layer includes a second organic material layer having electron transport ability, and a second doping material and a third doping material doped in the second organic material layer; wherein, the second doping material includes a metal material, and the third doping material includes a complex of the metal material formed by the metal material and the second organic material; 2. The display panel according to claim 1, wherein, the second organic material layer includes a first portion and a second portion, the first portion is disposed on a side of the second portion away from the second electrode layer, and the electron transport layer is disposed on a side of the first portion away from the second portion; the third doping material is doped in the first portion, and the second doping material is doped in the second portion; 3. The display panel according to claim 2, wherein, the lowest unoccupied molecular orbital energy level of the third doping material is greater than the lowest unoccupied molecular orbital energy level of the second doping material; 4. The display panel according to claim 2, wherein, the metal material is dispersedly arranged in the second portion; 5. The display panel according to claim 2, wherein, the doping concentration of the metal material in the second portion is 1% - 7%; 6. The display panel according to claim 1, wherein, the second electrode layer includes at least one metal, and the lowest unoccupied molecular orbital energy level of the metal material is less than the lowest unoccupied molecular orbital energy level of any one of the metals in the second electrode layer; 7. The display panel according to claim 6, wherein, the second electrode layer includes a first sub-layer, and the material of the first sub-layer is a mixture of magnesium and silver; 8. The display panel according to claim 7, wherein, the second electrode layer further includes a second sub-layer, and the material of the second sub-layer is silver; 9. The display panel according to claim 8, wherein, the second sub-layer is disposed on a side of the first sub-layer away from the substrate; 10. The display panel according to claim 1, wherein, the absolute value of the difference between the lowest unoccupied molecular orbital energy level of the electron transport layer and the lowest unoccupied molecular orbital energy level of the electron injection layer is 0 eV to 0.5 eV; 11. The display panel according to claim 1, wherein, the sum of the thicknesses of the electron transport layer and the electron injection layer ranges from 15 μm to 40 μm; 12. The display panel according to claim 1, wherein, the first light-emitting layer includes a cavity length adjustment layer and a light-emitting unit layer, the cavity length adjustment layer is disposed on a side of the light-emitting unit layer away from the second electrode layer; the light-emitting unit layer includes a plurality of first light-emitting units, a plurality of second light-emitting units and a plurality of third light-emitting units, and the first light-emitting units, the second light-emitting units and the third light-emitting units have different light-emitting colors.

13. The display panel according to claim 1, wherein, The material of the first organic material layer includes a first organic material, the material of the second organic material layer includes a second organic material, the first organic material and the second organic material are different, and the first organic material and the second organic material are each independently selected from at least one of pyridine derivatives, pyrimidine derivatives, triazine derivatives, imidazole derivatives, oxazole derivatives, and phenanthroline derivatives.

14. The display panel according to claim 1, wherein, The first doping material is lithium quinolate, the second doping material is different from the first doping material, and the metal material in the second doping material is an active metal, and the active metal is selected from alkali metals, alkaline earth metals, lanthanide metals, or actinide metals.

15. The display panel according to claim 14, wherein, The active metal is selected from Yb, Li, or Cs.

16. The display panel according to claim 1, wherein, The display panel further includes a second hole transport layer, a second light-emitting layer, a second electron transport layer, a first type charge generation layer, and a second type charge generation layer; Wherein, the second hole transport layer is disposed on a side of the hole injection layer away from the substrate, the second light-emitting layer is disposed on a side of the second hole transport layer away from the substrate, the second electron transport layer is disposed on a side of the second light-emitting layer away from the substrate, the first type charge generation layer is disposed on a side of the second electron transport layer away from the substrate, the second type charge generation layer is disposed on a side of the first type charge generation layer away from the substrate, and the hole transport layer is disposed on a side of the second type charge generation layer away from the substrate.

17. A display device, the display device includes a housing and a display panel, the housing has an accommodation space, and the display panel is disposed in the accommodation space; The display panel includes: A substrate; A first electrode layer disposed on one side of the substrate; A hole injection layer disposed on a side of the first electrode layer away from the substrate; A hole transport layer disposed on a side of the hole injection layer away from the substrate; A first light-emitting layer disposed on a side of the hole transport layer away from the substrate; An electron transport layer disposed on a side of the first light-emitting layer away from the substrate; An electron injection layer disposed on a side of the electron transport layer away from the substrate; A second electrode layer disposed on a side of the electron injection layer away from the substrate; Wherein, the electron transport layer includes a first organic material layer having electron transport ability, and a first doping material doped in the first organic material layer; the electron injection layer includes a second organic material layer having electron transport ability, and a second doping material and a third doping material doped in the second organic material layer; Wherein, the second doping material includes a metal material, and the third doping material includes a complex of the metal material formed by the metal material and the second organic material.

18. The display device according to claim 17, wherein, The second organic material layer includes a first part and a second part, the first part is disposed on a side of the second part away from the second electrode layer, and the electron transport layer is disposed on a side of the first part away from the second part; The third doping material is doped in the first part, the second doping material is doped in the second part, and the lowest unoccupied molecular orbital energy level of the third doping material is greater than that of the second doping material.

19. The display device according to claim 18, wherein, The metal material is dispersedly arranged in the second part.

20. The display device according to claim 18, wherein The doping concentration of the metal material in the second part is 1% - 7%.

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