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 first light-emitting layer, a first charge generation layer and a second light-emitting layer, which are arranged in a stacked manner, wherein the second light-emitting layer comprises a plurality of second light-emitting units displaying a first color; and first light-emitting units and the second light-emitting units both comprise any one of a fluorescent doping material, a phosphorescent doping material and a delayed fluorescent doping material, and the first light-emitting units and the second light-emitting units include different doping materials.

Description

Display panel and display device

[0001] This application claims priority to Chinese patent application No. 202410063105.5 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 displays, organic light-emitting diode (OLED) display panels have the advantages of being lighter, thinner, having better display effects, higher resolution, wider color gamut, and flexible display. As a result, they have developed rapidly in recent years and have become the preferred display panel type in small-size applications, and are gradually expanding into medium and large-size applications.

[0004] The medium and large-sized OLED display fields have higher requirements for display stability. This has led to an increase in the application demand for tandem OLED devices, which have great advantages in terms of device display life. Major display manufacturers have also invested resources in technology and product development.

[0005] Researchers of this application have discovered that, due to limitations imposed by the properties of the dopant material itself, a light-emitting layer comprising only one dopant material often suffers from a problem of being unable to strike a balance between luminous efficiency and lifetime. However, in conventional stacked OLED devices, the two light-emitting layers in a sub-pixel of a certain color (any one of red, green, and blue) have the same dopant material. This same dopant material ensures that the two light-emitting layers displaying the same color have the same luminous efficiency and lifetime characteristics. This, in turn, results in the problem that sub-pixels of a certain color in existing stacked OLED devices cannot strike a balance between luminous lifetime and luminous efficiency. SUMMARY OF THE INVENTION

[0006] The embodiments of the present application provide a display panel and a display device, which can effectively solve the problem in the related art that sub-pixels used to display a certain color in a stacked OLED device cannot take into account both luminous lifetime and luminous efficiency.

[0007] In a first aspect, an embodiment of the present application provides a display panel, comprising: a substrate; a first electrode layer, arranged on one side of the substrate; a first light-emitting layer, arranged on a side of the first electrode layer away from the substrate, the first light-emitting layer comprising a plurality of first light-emitting units displaying a first color; a first charge generating layer, arranged on a side of the first light-emitting layer away from the substrate; a second light-emitting layer, arranged on a side of the first charge generating layer away from the substrate, the second light-emitting layer comprising a plurality of second light-emitting units displaying the first color; wherein the first light-emitting unit and the second light-emitting unit both comprise any one of a fluorescent doping material, a phosphorescent doping material and a delayed fluorescent doping material, and the first light-emitting unit and the second light-emitting unit contain different doping materials.

[0008] 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

[0009] 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.

[0010] FIG1 is a cross-sectional schematic diagram of a first display panel provided in an embodiment of the present application.

[0011] FIG2 is a cross-sectional schematic diagram of a second display panel provided in an embodiment of the present application.

[0012] FIG3 is a schematic cross-sectional view of a third display panel provided in an embodiment of the present application.

[0013] FIG4 is a schematic cross-sectional view of a fourth display panel provided in an embodiment of the present application.

[0014] FIG5 is a schematic cross-sectional view of a fifth display panel provided in an embodiment of the present application.

[0015] FIG6 is a schematic cross-sectional view of a sixth display panel provided in an embodiment of the present application.

[0016] FIG7 is a schematic cross-sectional view of a first light-emitting unit including a phosphorescent dopant material provided in an embodiment of the present application.

[0017] FIG8 is a schematic cross-sectional view of a second light-emitting unit including a phosphorescent dopant material provided in an embodiment of the present application.

[0018] FIG9 is a schematic cross-sectional view of a seventh display panel provided in an embodiment of the present application.

[0019] FIG10 is a schematic cross-sectional view of an eighth display panel provided in an embodiment of the present application.

[0020] FIG11 is a schematic cross-sectional view of a ninth display panel provided in an embodiment of the present application.

[0021] Explanation of the reference numerals: 10, substrate; 20, first electrode layer; 30, first light-emitting layer; 31, first light-emitting unit; 311, first light-emitting sublayer; 33, third light-emitting unit; 35, fifth light-emitting unit; 40, first charge generation layer; 41, first type first charge generation layer; 42, second type first charge generation layer; 50, second light-emitting layer; 52, second light-emitting unit; 521, second light-emitting sublayer; 54, fourth light-emitting unit; 56, sixth light-emitting unit; 60, second electrode layer; 70, second charge generation layer; 71, first type second charge generation layer; 7 2. Second type second charge generation layer; 80. Third light-emitting layer; 87. Seventh light-emitting unit; 88. Eighth light-emitting unit; 89. Ninth light-emitting unit; M0. Driving circuit layer; M1. Hole injection layer; M2. First hole transport layer; M3. First cavity length adjustment layer; M4. First electron transport layer; M5. Second hole transport layer; M6. Second cavity length adjustment layer; M7. Hole blocking layer; M8. Second electron transport layer; M9. Electron injection layer; M10. Capping layer; M11. Third hole transport layer; M12. Third cavity length adjustment layer; M13. Third electron transport layer. Modes for Carrying Out the Invention

[0022] 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.

[0023] 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.

[0024] Example 1

[0025] Figure 1 is a schematic cross-sectional view of a first display panel provided in some embodiments of the present application; Figure 2 is a schematic cross-sectional view of a second display panel provided in some embodiments of the present application; Figure 3 is a schematic cross-sectional view of a third display panel provided in some embodiments of the present application; Figure 4 is a schematic cross-sectional view of a fourth display panel provided in some embodiments of the present application; Figure 5 is a schematic cross-sectional view of a fifth display panel provided in some embodiments of the present application; and Figure 6 is a schematic cross-sectional view of a sixth display panel provided in some embodiments of the present application. Referring to Figures 1 to 6 , in a first aspect, the display panel provided in Example 1 of the present application includes a substrate 10, a first electrode layer 20, a first light-emitting layer 30, a first charge generation layer 40, and a second light-emitting layer 50. The first electrode layer 20 is disposed on one side of the substrate 10; the first light-emitting layer 30 is disposed on a side of the first electrode layer 20 away from the substrate 10, and the first light-emitting layer 30 includes a plurality of first light-emitting units 31 that display a first color; the first charge generation layer 40 is disposed on a side of the first light-emitting layer 30 away from the substrate 10; and the second light-emitting layer 50 is disposed on a side of the first charge generation layer 40 away from the substrate 10, and the second light-emitting layer 50 includes a plurality of second light-emitting units 52 that display the first color. The first light-emitting units 31 and the second light-emitting units 52 each include any one of a fluorescent dopant material, a phosphorescent dopant material, and a delayed fluorescent dopant material, and the first light-emitting units 31 and the second light-emitting units 52 include different dopant materials.

[0026] In the display panel provided in the present application, since the first light-emitting unit 31 and the second light-emitting unit 52 contain different doping materials, the luminous efficiency characteristics of the first light-emitting unit 31 can be different from the luminous efficiency characteristics of the second light-emitting unit 52, and the life characteristics of the first light-emitting unit 31 can be different from the life characteristics of the second light-emitting unit 52. It can also be combined with the composite light-emitting structure of the stacked first light-emitting unit 31 and the second light-emitting unit 52, so that the sub-pixels of the first color displayed by the display panel have the advantages of high luminous efficiency and long life.

[0027] In some embodiments of the present application, the first color may be red, green, or blue, and the sub-pixel displaying the first color may be a red sub-pixel, a green sub-pixel, or a blue sub-pixel.

[0028] In some embodiments of the present application, the first color is blue, and the sub-pixel displaying the first color is a blue sub-pixel. Specifically, researchers have found that, at present, the balance between the luminous efficiency and lifespan of blue light-emitting units of different doping types is poor. That is, the luminous efficiency of a blue light-emitting unit of one doping type is higher and can meet the low power consumption standard, but its lifespan is shorter and it is difficult to meet the user's usage needs; while the lifespan of a blue light-emitting unit of another doping type is longer and can meet the user's usage needs, but its luminous efficiency is poor and cannot meet the low power consumption standard. Therefore, it is preferred to improve the doping type of the first light-emitting unit 31 and the second light-emitting unit 52 in the sub-pixel displaying blue, so that the sub-pixel displaying blue on the display panel has the advantages of both high luminous efficiency and long lifespan.

[0029] In some embodiments of the present application, a difference between a peak of a spectrum emitted by the first light-emitting unit 31 and a peak of a spectrum emitted by the second light-emitting unit 52 is less than or equal to 10 nm.

[0030] The basic working principle of the display panel of the stacked structure provided in the embodiment of the present application is that electrons and holes are respectively recombined in the first light-emitting layer 30 and the second light-emitting layer 50, thereby achieving light emission. The first charge generation layer 40 in the display panel is arranged between the first light-emitting layer 30 and the second light-emitting layer 50, and is used to play the role of charge generation and separation. That is, the first charge generation layer 40 is used to generate one type of electron or hole, so that it migrates to the first light-emitting layer 30 and recombines with the other type of electron or hole in the first light-emitting layer 30, thereby achieving light emission. The first charge generation layer 40 is also used to generate another type of electron or hole, so that it migrates to the second light-emitting layer 50 and recombines with the one type of electron or hole in the second light-emitting layer 50, thereby achieving light emission. Therefore, the first light-emitting unit 31 in the first light-emitting layer 30 and the second light-emitting unit 52 in the second light-emitting layer 50 will achieve light emission under the action of the first charge generation layer 40, and jointly affect the display effect of the sub-pixel displaying the first color in the display panel. The present application makes the difference between the peak of the spectrum emitted by the first light-emitting unit 31 and the peak of the spectrum emitted by the second light-emitting unit 52 less than or equal to 10nm, thereby controlling the spectral difference of the first light-emitting unit 31 and the spectral difference of the second light-emitting unit 52 within a reasonable range, and then controlling the half-wave width corresponding to the synthetic spectrum of the first light-emitting unit 31 and the second light-emitting unit 52, thereby improving the display effect of the sub-pixel displaying the first color in the display panel.

[0031] In some embodiments of the present application, the first charge generation layer 40 includes a first-type first charge generation layer 41 and a second-type first charge generation layer 42, wherein the second-type first charge generation layer 42 is disposed on a side of the first-type first charge generation layer 41 away from the substrate 10. Referring to FIG. 1 to FIG. 6 , optionally, the first-type first charge generation layer 41 is doped with an N-type, and the first-type first charge generation layer 41 is used to provide electrons to the first light-emitting layer 30; the second-type first charge generation layer 42 is doped with a P-type, and the second-type first charge generation layer 42 is used to provide holes to the first light-emitting layer 30.

[0032] Of course, in other embodiments of the present application, the doping type of the first-type first charge generation layer 41 is P-type, and the first-type first charge generation layer 41 is used to provide holes to the first light-emitting layer 30; the doping type of the second-type first charge generation layer 42 is N-type, and the second-type first charge generation layer 42 is used to provide electrons to the first light-emitting layer 30.

[0033] In some embodiments of the present application, the half-wave width of the spectrum emitted by the first light-emitting unit 31 is less than or equal to 15 nm; the half-wave width of the spectrum emitted by the second light-emitting unit 52 is less than or equal to 15 nm.

[0034] In the display panel provided by the present application, the first light-emitting unit 31 in the first light-emitting layer 30 and the second light-emitting unit 52 in the second light-emitting layer 50 emit light under the action of the first charge generation layer 40, and jointly affect the display effect of the sub-pixel displaying the first color in the display panel. By ensuring that the half-wave width of the spectrum emitted by the first light-emitting unit 31 is less than or equal to 15 nm and the half-wave width of the spectrum emitted by the second light-emitting unit 52 is less than or equal to 15 nm, the difference in the half-wave width of the first light-emitting unit 31 and the difference in the half-wave width of the second light-emitting unit 52 can be controlled within a reasonable range. Furthermore, the half-wave width corresponding to the composite spectrum of the first light-emitting unit 31 and the second light-emitting unit 52 can be controlled, thereby improving the display effect of the sub-pixel displaying the first color in the display panel.

[0035] In some embodiments of the present application, the first light-emitting layer 30 further includes a plurality of third light-emitting units 33 displaying a second color, and a plurality of fifth light-emitting units 35 displaying a third color; the second light-emitting layer 50 further includes a plurality of fourth light-emitting units 54 displaying a second color, and a plurality of sixth light-emitting units 56 displaying a third color; wherein the third light-emitting unit 33, the fourth light-emitting unit 54, the fifth light-emitting unit 35 and the sixth light-emitting unit 56 all include the phosphorescent doping material.

[0036] In the display panel provided in this application, for example, the first color is blue, the second color is red, and the third color is green. Researchers in this application have found that a standard luminous efficiency value and a standard lifespan value are pre-set, wherein the standard luminous efficiency value is higher than the luminous efficiency of the first light-emitting unit 31 or the second light-emitting unit 52 with the lower luminous efficiency, and the standard lifespan value is higher than the lifespan value of the first light-emitting unit 31 or the second light-emitting unit 52 with the shorter lifespan.

[0037] When the light-emitting units in the sub-pixel displaying red (i.e., the third light-emitting unit 33 and the fourth light-emitting unit 54) include the phosphorescent doping material, the luminous efficiency of the third light-emitting unit 33 and the luminous efficiency of the fourth light-emitting unit 54 are both higher than the luminous efficiency standard value, and the lifespan value of the third light-emitting unit 33 and the lifespan value of the fourth light-emitting unit 54 are both higher than the lifespan standard value.

[0038] When the light-emitting units in the sub-pixel displaying green (i.e., the fifth light-emitting unit 35 and the sixth light-emitting unit 56) include the phosphorescent doping material, the luminous efficiency of the fifth light-emitting unit 35 and the luminous efficiency of the sixth light-emitting unit 56 are both higher than the luminous efficiency standard value, and the lifespan value of the fifth light-emitting unit 35 and the lifespan value of the sixth light-emitting unit 56 are both higher than the lifespan standard value.

[0039] 1 , the first light emitting unit 31 includes a fluorescent dopant material, and the second light emitting unit 52 includes a phosphorescent dopant material.

[0040] 2 , the first light emitting unit 31 includes a phosphorescent dopant material, and the second light emitting unit 52 includes a fluorescent dopant material.

[0041] 3 , the first light emitting unit 31 includes a fluorescent doping material, and the second light emitting unit 52 includes a delayed fluorescent doping material.

[0042] 4 , the first light emitting unit 31 includes a delayed fluorescent dopant material, and the second light emitting unit 52 includes a fluorescent dopant material.

[0043] 5 , the first light emitting unit 31 includes a phosphorescent dopant material, and the second light emitting unit 52 includes a delayed fluorescent dopant material.

[0044] 6 , the first light emitting unit 31 includes a delayed fluorescent dopant material, and the second light emitting unit 52 includes a phosphorescent dopant material.

[0045] In some embodiments of the present application, in a direction perpendicular to the substrate 10 , the thickness of the first light emitting unit 31 is the same as the thickness of the second light emitting unit 52 .

[0046] In the display panel provided by this application, since the first light-emitting unit 31 and the second light-emitting unit 52 contain different doping materials, the doping processes of the first light-emitting unit 31 and the second light-emitting unit 52 are different, which increases the cost of forming the sub-pixel displaying the first color. The researchers of this application found that by making the thickness of the first light-emitting unit 31 and the thickness of the second light-emitting unit 52 the same in the direction perpendicular to the substrate 10, the film formation process of the base film of the first light-emitting unit 31 and the base film of the second light-emitting unit 52 can be made the same, thereby improving the film formation stability of the first light-emitting unit 31 and the second light-emitting unit 52, reducing the process difficulty and manufacturing cost.

[0047] In some embodiments of the present application, one of the first light-emitting unit 31 and the second light-emitting unit 52 includes a phosphorescent dopant material. When the first light-emitting unit 31 includes a phosphorescent dopant material, the thickness of the first light-emitting unit 31 is greater than the thickness of the second light-emitting unit 52 in a direction perpendicular to the substrate 10. When the second light-emitting unit 52 includes a phosphorescent dopant material, the thickness of the second light-emitting unit 52 is greater than the thickness of the first light-emitting unit 31 in a direction perpendicular to the substrate 10. As shown in Figures 2 and 5, the first light-emitting unit 31 includes a phosphorescent dopant material, and the thickness of the first light-emitting unit 31 is greater than the thickness of the second light-emitting unit 52. As shown in Figures 1 and 6, the second light-emitting unit 52 includes a phosphorescent dopant material, and the thickness of the second light-emitting unit 52 is greater than the thickness of the first light-emitting unit 31 in a direction perpendicular to the substrate 10.

[0048] The researchers of this application discovered that the luminescent units doped with phosphorescent dopant materials have high luminous efficiency but relatively low lifespan. Therefore, it is necessary to extend the lifespan of the luminescent units doped with phosphorescent dopant materials as much as possible through structural adjustments. In addition, the applicant unexpectedly discovered that by increasing the thickness, the lifespan of the luminescent units doped with phosphorescent dopant materials can be effectively extended. When the thickness is increased to the same level, the lifespan of the luminescent units doped with phosphorescent dopant materials is increased to a greater extent.

[0049] Therefore, when the first light-emitting unit 31 includes a phosphorescent doping material, the present application can effectively extend the life of the first light-emitting unit 31 by making the thickness of the first light-emitting unit 31 greater than the thickness of the second light-emitting unit 52 in a direction perpendicular to the substrate 10, thereby extending the life of the sub-pixel displaying the first color, and making the sub-pixel displaying the first color better matched with the sub-pixel displaying the second color and the sub-pixel displaying the third color.

[0050] Similarly, when the second light-emitting unit 52 includes a phosphorescent doped material, the present application can effectively extend the life of the second light-emitting unit 52 by making the thickness of the second light-emitting unit 52 greater than the thickness of the first light-emitting unit 31 in a direction perpendicular to the substrate 10, thereby extending the life of the sub-pixel displaying the first color, and making the sub-pixel displaying the first color better matched with the sub-pixel displaying the second color and the sub-pixel displaying the third color.

[0051] In some embodiments of the present application, the display panel further includes: a second electrode layer 60, which is arranged on the side of the second light-emitting layer 50 away from the substrate 10; wherein, when the first electrode layer 20 is an anode, the second light-emitting unit 52 includes a phosphorescent dopant material; when the second electrode layer 60 is an anode, the first light-emitting unit 31 includes a phosphorescent dopant material.

[0052] Researchers of this application have found that the distance between the light-emitting unit doped with phosphorescent doping material and the anode has a significant impact on the life of the light-emitting unit doped with phosphorescent doping material. Therefore, this application makes the second light-emitting unit 52 include phosphorescent doping material when the first electrode layer 20 is the anode, and makes the first light-emitting unit 31 include phosphorescent doping material when the second electrode layer 60 is the anode, so that the light-emitting unit including phosphorescent doping material can be arranged on the side of the other light-emitting unit away from the anode, thereby increasing the distance between the light-emitting unit including phosphorescent doping material and the anode, and extending the life of the light-emitting unit including phosphorescent doping material.

[0053] Figure 7 is a schematic cross-sectional view of a first light-emitting unit including a phosphorescent dopant material provided in some embodiments of the present application; Figure 8 is a schematic cross-sectional view of a second light-emitting unit including a phosphorescent dopant material provided in some embodiments of the present application. Referring to Figures 7 and 8, in some embodiments of the present application, one of the first light-emitting unit 31 and the second light-emitting unit 52 includes a phosphorescent dopant material. When the first light-emitting unit 31 includes a phosphorescent dopant material, the first light-emitting unit 31 includes a plurality of first light-emitting sublayers 311, each of which is provided with a phosphorescent dopant material; when the second light-emitting unit 52 includes a phosphorescent dopant material, the second light-emitting unit 52 includes a plurality of second light-emitting sublayers 521, each of which is provided with a phosphorescent dopant material.

[0054] The researchers of this application have found that by setting a sub-film layer for the light-emitting unit doped with phosphorescent doping material, the life of the light-emitting unit doped with phosphorescent doping material can be effectively extended. Therefore, this application extends the life of the first light-emitting unit 31 by including a plurality of first light-emitting sublayers 311 in the first light-emitting unit 31 when the first light-emitting unit 31 includes a phosphorescent doping material, and each of the first light-emitting sublayers 311 is provided with a phosphorescent doping material; and extends the life of the second light-emitting unit 52 by including a plurality of second light-emitting sublayers 521 in the second light-emitting unit 52 when the second light-emitting unit 52 includes a phosphorescent doping material.

[0055] In some embodiments of the present application, the display panel further includes a driving circuit layer M0 , which is disposed between the substrate 10 and the first electrode layer 20 , and includes a plurality of thin film transistors.

[0056] In some embodiments of the present application, the display panel further includes a hole injection layer M1, a first hole transport layer M2, a first cavity length adjustment layer M3, a first electron transport layer M4, a second hole transport layer M5, a second cavity length adjustment layer M6, a hole blocking layer M7, a second electron transport layer M8, an electron injection layer M9, and a capping layer M10, which are sequentially stacked on the side of the first electrode layer 20 away from the substrate 10. It should be noted that the stacked display panel architecture may further include at least one other blocking layer (not shown in the figure), the thickness of which is the same as that of the hole blocking layer M7.

[0057] The researchers of this application conducted the first verification experiment on the laminated display panel shown in Figure 1, in which the first color is blue, the first light-emitting unit 31 includes a fluorescent dopant material, and the second light-emitting unit 52 includes a phosphorescent dopant material. The first electrode layer 20 is an anode; the hole injection layer M1 has a thickness of 10nm; the first hole transport layer M2 has a thickness of 25nm; the first light-emitting unit 31 has a thickness of 20nm; the first electron transport layer M4 has a thickness of 20nm; the first type first charge generation layer 41 has a thickness of 10nm; the second type first charge generation layer 42 has a thickness of 10nm; the second hole transport layer M5 has a thickness of 30nm; the second light-emitting unit 52 has a thickness of 20nm; the hole blocking layer M7 has a thickness of 5nm; the second electron transport layer M8 has a thickness of 30nm; and the electron injection layer M9 has a thickness of 1nm.

[0058] The researchers of this application conducted a second verification experiment on the laminated display panel shown in Figure 2, in which the first color is blue, the first light-emitting unit 31 includes a phosphorescent dopant material, and the second light-emitting unit 52 includes a fluorescent dopant material. The first electrode layer 20 is an anode; the hole injection layer M1 has a thickness of 10 nm; the first hole transport layer M2 has a thickness of 25 nm; the first light-emitting unit 31 has a thickness of 20 nm; the first electron transport layer M4 has a thickness of 20 nm; the first type first charge generation layer 41 has a thickness of 10 nm; the second type first charge generation layer 42 has a thickness of 10 nm; the second hole transport layer M5 has a thickness of 30 nm; the second light-emitting unit 52 has a thickness of 20 nm; the hole blocking layer M7 has a thickness of 5 nm; the second electron transport layer M8 has a thickness of 30 nm; and the electron injection layer M9 has a thickness of 1 nm.

[0059] In addition, the researchers of this application conducted a third verification experiment on a laminated display panel in the related art, in which the first color is blue, the first light-emitting unit 31 includes a fluorescent dopant material, and the second light-emitting unit 52 includes a fluorescent dopant material. The first electrode layer 20 is an anode; the thickness of the hole injection layer M1 is 10nm; the thickness of the first hole transport layer M2 is 25nm; the thickness of the first light-emitting unit 31 is 20nm; the thickness of the first electron transport layer M4 is 20nm; the thickness of the first type first charge generation layer 41 is 10nm; the thickness of the second type first charge generation layer 42 is 10nm; the thickness of the second hole transport layer M5 is 30nm; the thickness of the second light-emitting unit 52 is 20nm; the thickness of the hole blocking layer M7 is 5nm; the thickness of the second electron transport layer M8 is 30nm; and the thickness of the electron injection layer M9 is 1nm.

[0060] The three aforementioned verification tests all involved sequentially depositing the aforementioned material layers under high vacuum conditions. The voltage and luminous efficiency of the resulting laminated display panels were recorded under the same brightness (1000 nits), and the lifetime of the resulting laminated display panels was also recorded under the same brightness (1000 nits).

[0061] The verification results show:

[0062] The voltage of the laminated display panel targeted in the first verification experiment was 6.58V, the luminous efficiency was 21.03cd / A, and the lifespan was 2820h. The standard luminous efficiency was set at 20cd / A, and the standard lifespan was 2000h, which meets actual application requirements.

[0063] The voltage of the laminated display panel targeted by the second verification experiment was 6.57V, the luminous efficiency value was 22.79cd / A, and the lifespan value was 2480h. The standard luminous efficiency value was set to 20cd / A, and the standard lifespan value was set to 2000h, which meets actual application requirements.

[0064] The voltage of the laminated display panel targeted by the third verification experiment was 6.45V, the luminous efficiency value was 15.05cd / A, and the lifespan value was 3450h. The set luminous efficiency standard value was 20cd / A, and the lifespan standard value was 2000h, which did not meet actual application requirements.

[0065] In a second aspect, an embodiment of the present application provides a display device, comprising a housing and any one of the display panels described above, wherein the housing has an accommodating space, and the display panel is disposed in the accommodating space.

[0066] Example 2

[0067] Figure 9 is a cross-sectional schematic diagram of the seventh display panel provided in some embodiments of the present application; Figure 10 is a cross-sectional schematic diagram of the eighth display panel provided in some embodiments of the present application; and Figure 11 is a cross-sectional schematic diagram of the ninth display panel provided in some embodiments of the present application. Referring to Figures 9-11, in the first aspect, the display panel provided in the second embodiment of the present application includes a substrate 10, a first electrode layer 20, a first light-emitting layer 30, a first charge generation layer 40, and a second light-emitting layer 50. The first electrode layer 20 is arranged on one side of the substrate 10; the first light-emitting layer 30 is arranged on a side of the first electrode layer 20 away from the substrate 10, and the first light-emitting layer 30 includes a plurality of first light-emitting units 31 that display a first color; the first charge generation layer 40 is arranged on a side of the first light-emitting layer 30 away from the substrate 10; the second light-emitting layer 50 is arranged on a side of the first charge generation layer 40 away from the substrate 10, and the second light-emitting layer 50 includes a plurality of second light-emitting units 52 that display the first color. The first light emitting unit 31 and the second light emitting unit 52 both include any one of a fluorescent dopant material, a phosphorescent dopant material, and a delayed fluorescent dopant material, and the first light emitting unit 31 and the second light emitting unit 52 include different dopant materials.

[0068] 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.

[0069] In some embodiments of the present application, the display panel further includes: a second charge generation layer 70 disposed on a side of the second light-emitting layer 50 away from the substrate 10; and a third light-emitting layer 80 disposed on a side of the second charge generation layer 70 away from the substrate 10, wherein the third light-emitting layer 80 includes a plurality of seventh light-emitting units 87 that display a first color. The first light-emitting units 31, the second light-emitting units 52, and the seventh light-emitting units 87 each include any one of a fluorescent dopant material, a phosphorescent dopant material, and a delayed fluorescent dopant material, and the first light-emitting units 31, the second light-emitting units 52, and the seventh light-emitting units 87 include different dopant materials.

[0070] In the display panel provided in the embodiment of the present application, since the display panel also includes a third light-emitting layer 80, the third light-emitting layer 80 includes a seventh light-emitting unit 87 that displays the same color as the first light-emitting unit 31 and the second light-emitting unit 52, and the first light-emitting unit 31, the second light-emitting unit 52 and the seventh light-emitting unit 87 all include any one of a fluorescent doping material, a phosphorescent doping material, and a delayed fluorescence doping material, and the first light-emitting unit 31, the second light-emitting unit 52 and the seventh light-emitting unit 87 contain different doping materials. Therefore, the luminous efficiency characteristics of the first light-emitting unit 31, the second light-emitting unit 52 and the seventh light-emitting unit 87 can be made different, and the lifespan characteristics of the first light-emitting unit 31, the second light-emitting unit 52 and the seventh light-emitting unit 87 can be made different. Moreover, the light-emitting efficiency of the sub-pixel displaying the first color can be further improved, and the lifespan of the sub-pixel displaying the first color can be extended by combining with the composite light-emitting structure of the stacked first light-emitting unit 31, the second light-emitting unit 52 and the seventh light-emitting unit 87.

[0071] In some embodiments of the present application, the first color is blue, the second color is red, and the third color is green.

[0072] 9-11 , the first light emitting unit 31 includes a fluorescent dopant material, the second light emitting unit 52 includes a delayed fluorescent dopant material, the seventh light emitting unit 87 includes a phosphorescent dopant material, and the first electrode layer 20 is an anode.

[0073] In the display panel provided in the present application, since the seventh light-emitting unit 87 of the phosphorescent doped material is the light-emitting unit farthest from the anode among the first light-emitting unit 31, the second light-emitting unit 52, and the seventh light-emitting unit 87 that display the first color, the lifespan of the seventh light-emitting unit 87 including the phosphorescent doped material can be further improved.

[0074] Continuing with reference to Figure 9, in some embodiments of the present application, the third light-emitting layer 80 also includes a plurality of eighth light-emitting units 88 displaying the second color and a plurality of ninth light-emitting units 89 displaying the third color. The third light-emitting unit 33, the fourth light-emitting unit 54, the fifth light-emitting unit 35, the sixth light-emitting unit 56, the eighth light-emitting unit 88, and the ninth light-emitting unit 89 all include the phosphorescent doping material, so as to reduce the doping type of the third light-emitting unit 33, the fourth light-emitting unit 54, the fifth light-emitting unit 35, the sixth light-emitting unit 56, the eighth light-emitting unit 88, and the ninth light-emitting unit 89, thereby reducing material costs while basically meeting the requirements of luminous efficiency and life of sub-pixels displaying the second color and sub-pixels displaying the third color.

[0075] Continuing with reference to Figure 10, in some embodiments of the present application, the third light-emitting layer 80 also includes a plurality of eighth light-emitting units 88 displaying the second color and a plurality of ninth light-emitting units 89 displaying the third color. The third light-emitting unit 33, the fourth light-emitting unit 54, the fifth light-emitting unit 35, and the sixth light-emitting unit 56 all include the phosphorescent doping material, and the eighth light-emitting unit 88 and the ninth light-emitting unit 89 all include fluorescent doping materials to further improve the luminous efficiency or lifespan of the sub-pixels displaying the second color and the sub-pixels displaying the third color.

[0076] Continuing with reference to Figure 11, in some embodiments of the present application, the third light-emitting layer 80 also includes a plurality of eighth light-emitting units 88 displaying the second color and a plurality of ninth light-emitting units 89 displaying the third color. The third light-emitting unit 33, the fourth light-emitting unit 54, the fifth light-emitting unit 35, and the sixth light-emitting unit 56 all include the phosphorescent doping material, and the eighth light-emitting unit 88 and the ninth light-emitting unit 89 all include delayed fluorescence doping materials to further improve the luminous efficiency or lifespan of the sub-pixels displaying the second color and the sub-pixels displaying the third color.

[0077] In some embodiments of the present application, the third light-emitting layer 80 also includes a plurality of eighth light-emitting units 88 displaying a second color and a plurality of ninth light-emitting units 89 displaying a third color. The third light-emitting unit 33, the fourth light-emitting unit 54, the fifth light-emitting unit 35, and the sixth light-emitting unit 56 all include the phosphorescent doping material. The eighth light-emitting unit 88 includes one of a fluorescent doping material and a delayed fluorescent doping material. The ninth light-emitting unit 89 includes the other of a fluorescent doping material and a delayed fluorescent doping material.

[0078] In some embodiments of the present application, the second charge generation layer 70 includes a first-type second charge generation layer 71 and a second-type second charge generation layer 72 .

[0079] In some embodiments of the present application, the display panel further includes a third hole transport layer M11 , a third cavity length adjustment layer M12 , and a third electron transport layer M13 , which are sequentially stacked in a direction away from the substrate 10 .

[0080] In a second aspect, an embodiment of the present application provides a display device, comprising a housing and any one of the display panels described above, wherein the housing has an accommodating space, and the display panel is disposed in the accommodating space.

[0081] In summary, the present application provides a display panel and a display device. The display panel includes a substrate, a first electrode layer, a first light-emitting layer, a first charge generation layer, and a second light-emitting layer, wherein the first electrode layer is disposed on one side of the substrate; the first light-emitting layer is disposed on a side of the first electrode layer away from the substrate, and the first light-emitting layer includes a plurality of first light-emitting units that display a first color; the first charge generation layer is disposed on a side of the first light-emitting layer away from the substrate; and the second light-emitting layer is disposed on a side of the first charge generation layer away from the substrate, and the second light-emitting layer includes a plurality of second light-emitting units that display the first color. The first light-emitting unit and the second light-emitting unit each include any one of a fluorescent dopant material, a phosphorescent dopant material, and a delayed fluorescent dopant material, and the first light-emitting unit and the second light-emitting unit include different dopant materials. In the display panel and display device provided in the present application, since the first light-emitting unit and the second light-emitting unit contain different doping materials, the luminous efficiency characteristics of the first light-emitting unit can be different from the luminous efficiency characteristics of the second light-emitting unit, and the life characteristics of the first light-emitting unit can be different from the life characteristics of the second light-emitting unit. Combined with the composite light-emitting structure of the stacked first light-emitting unit and the second light-emitting unit, the sub-pixels of the first color displayed by the display panel have the advantages of high luminous efficiency and long life.

[0082] 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 first light-emitting layer disposed on the side of the first electrode layer away from the substrate, the first light-emitting layer including a plurality of first light-emitting units that emit a first color; A first charge generation layer disposed on the side of the first light-emitting layer away from the substrate; A second light-emitting layer disposed on the side of the first charge generation layer away from the substrate, the second light-emitting layer including a plurality of second light-emitting units that emit the first color; Wherein, both the first light-emitting unit and the second light-emitting unit include any one of a fluorescent doping material, a phosphorescent doping material, and a delayed fluorescence doping material, and the first light-emitting unit and the second light-emitting unit contain different doping materials.

2. The display panel according to claim 1, wherein, The difference between the peak of the spectrum emitted by the first light-emitting unit and the peak of the spectrum emitted by the second light-emitting unit is less than or equal to 10 nm.

3. The display panel according to claim 2, wherein, The full width at half maximum of the spectrum emitted by the first light-emitting unit is less than or equal to 15 nm; The full width at half maximum of the spectrum emitted by the second light-emitting unit is less than or equal to 15 nm.

4. The display panel according to claim 1, wherein The first color is blue.

5. The display panel according to claim 1, wherein, The first charge generation layer includes a first-type first charge generation layer and a second-type first charge generation layer, and the second-type first charge generation layer is disposed on the side of the first-type first charge generation layer away from the substrate; The doping type of the first-type first charge generation layer is N-type, and the doping type of the second-type first charge generation layer is P-type; or, the doping type of the first-type first charge generation layer is P-type, and the doping type of the second-type first charge generation layer is N-type.

6. The display panel according to claim 1, wherein, The first light-emitting layer further includes a plurality of third light-emitting units that emit a second color and a plurality of fifth light-emitting units that emit a third color; the second light-emitting layer further includes a plurality of fourth light-emitting units that emit the second color and a plurality of sixth light-emitting units that emit the third color; Wherein, the third light-emitting unit, the fourth light-emitting unit, the fifth light-emitting unit, and the sixth light-emitting unit all include the phosphorescent doping material.

7. The display panel according to claim 6, wherein, The second color is red, and the third color is green.

8. The display panel according to claim 1, wherein, In the direction perpendicular to the substrate, the thickness of the first light-emitting unit is the same as the thickness of the second light-emitting unit.

9. The display panel according to claim 1, wherein, One of the first light-emitting unit and the second light-emitting unit includes a phosphorescent doping material, When the first light-emitting unit includes a phosphorescent doping material, in the direction perpendicular to the substrate, the thickness of the first light-emitting unit is greater than the thickness of the second light-emitting unit; When the second light-emitting unit includes a phosphorescent doping material, in the direction perpendicular to the substrate, the thickness of the second light-emitting unit is greater than the thickness of the first light-emitting unit.

10. The display panel according to claim 9, wherein, The display panel further includes: A second electrode layer disposed on the side of the second light-emitting layer away from the substrate; wherein, When the first electrode layer is an anode, the second light-emitting unit includes a phosphorescent doping material; When the second electrode layer is an anode, the first light-emitting unit includes a phosphorescent doping material.

11. The display panel according to claim 1, wherein, One of the first light-emitting unit and the second light-emitting unit includes a phosphorescent doping material, When the first light-emitting unit includes a phosphorescent doping material, the first light-emitting unit includes a plurality of first light-emitting sub-layers, and the phosphorescent doping material is disposed in each of the first light-emitting sub-layers; When the second light-emitting unit includes a phosphorescent doping material, the second light-emitting unit includes a plurality of second light-emitting sub-layers, and the phosphorescent doping material is disposed in each of the second light-emitting sub-layers.

12. The display panel according to claim 1, wherein, The display panel further includes a driving circuit layer disposed between the substrate and the first electrode layer, and the driving circuit layer includes a plurality of thin film transistors.

13. The display panel according to claim 1, wherein, The display panel further includes a hole injection layer, a first hole transport layer, a first cavity length adjustment layer, a first electron transport layer, a second hole transport layer, a second cavity length adjustment layer, a hole blocking layer, a second electron transport layer, an electron injection layer, a second electrode layer, and a capping layer sequentially stacked on a side of the first electrode layer away from the substrate; The hole injection layer, the first hole transport layer, and the first cavity length adjustment layer are located between the first electrode layer and the first light-emitting layer, the first electron transport layer is located between the first light-emitting layer and the first charge generation layer, the second hole transport layer and the second cavity length adjustment layer are located between the first charge generation layer and the second light-emitting layer, the hole blocking layer, the second electron transport layer, and the electron injection layer are located between the second light-emitting layer and the second electrode layer, the second electrode layer is located on a side of the second light-emitting layer away from the substrate, and the capping layer is located on a side of the second electrode layer away from the substrate.

14. The display panel according to claim 1, wherein, The display panel further includes: a second charge generation layer disposed on a side of the second light-emitting layer away from the substrate; a third light-emitting layer disposed on a side of the second charge generation layer away from the substrate, and the third light-emitting layer includes a plurality of seventh light-emitting units that display a first color; Wherein, the first light-emitting unit, the second light-emitting unit, and the seventh light-emitting unit each include any one of a fluorescent doping material, a phosphorescent doping material, and a delayed fluorescence doping material, and the first light-emitting unit, the second light-emitting unit, and the seventh light-emitting unit contain different doping materials.

15. The display panel according to claim 14, wherein, The first light-emitting unit includes a fluorescent doping material, the second light-emitting unit includes a delayed fluorescence doping material, the seventh light-emitting unit includes a phosphorescent doping material, and the first electrode layer is an anode.

16. The display panel according to claim 14, wherein, The first light-emitting layer further includes a plurality of third light-emitting units that display a second color and a plurality of fifth light-emitting units that display a third color; the second light-emitting layer further includes a plurality of fourth light-emitting units that display a second color and a plurality of sixth light-emitting units that display a third color; the third light-emitting layer further includes a plurality of eighth light-emitting units that display a second color and a plurality of ninth light-emitting units that display a third color; The third light-emitting unit, the fourth light-emitting unit, the fifth light-emitting unit, the sixth light-emitting unit, the eighth light-emitting unit, and the ninth light-emitting unit each include the phosphorescent doping material.

17. The display panel according to claim 14, wherein, The first light-emitting layer further includes a plurality of third light-emitting units that display a second color and a plurality of fifth light-emitting units that display a third color; the second light-emitting layer further includes a plurality of fourth light-emitting units that display the second color and a plurality of sixth light-emitting units that display the third color; the third light-emitting layer further includes a plurality of eighth light-emitting units that display the second color and a plurality of ninth light-emitting units that display the third color; The third light-emitting unit, the fourth light-emitting unit, the fifth light-emitting unit, and the sixth light-emitting unit all include the phosphorescent doping material, and each of the eighth light-emitting unit and the ninth light-emitting unit includes any one of the fluorescent doping material and the delayed fluorescent doping material.

18. The display panel according to claim 14, wherein, The second charge generation layer includes a first-type second charge generation layer and a second-type second charge generation layer.

19. 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 first light-emitting layer disposed on a side of the first electrode layer away from the substrate, the first light-emitting layer includes a plurality of first light-emitting units that display a first color; A first charge generation layer disposed on a side of the first light-emitting layer away from the substrate; A second light-emitting layer disposed on a side of the first charge generation layer away from the substrate, the second light-emitting layer includes a plurality of second light-emitting units that display the first color; Wherein, each of the first light-emitting unit and the second light-emitting unit includes any one of a fluorescent doping material, a phosphorescent doping material, and a delayed fluorescent doping material, and the first light-emitting unit and the second light-emitting unit contain different doping materials.

20. The display device according to claim 19, wherein, The difference between the peak of the spectrum emitted by the first light-emitting unit and the peak of the spectrum emitted by the second light-emitting unit is less than or equal to 10 nm.

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