Display substrate and display device

Abstract

A display substrate and a display device, the display substrate comprising: a plurality of light emitting devices distributed at different sub-pixel regions, adjacent light emitting devices being separated by a pixel definition layer; the light emitting device comprising a first electrode, a light emitting functional layer and a second electrode arranged in sequence on a substrate in a direction away from the substrate; the light emitting functional layer extending to a surface of the pixel definition layer on a side away from the substrate; a corresponding region of the light emitting functional layer at a contact position of the pixel definition layer and the first electrode being a curved surface, an angle of slope of the curved surface being θ; when the display substrate displays white light at 255 gray scale, each light emitting device satisfies the following formulae: |Δu'v'(horizon)-Δu'v'(vertical)| / 0.004≤1 (1) θ(horizon)-θ(vertical)≤10° (2). The display substrate of the embodiment has smaller color deviation at different angles, and the color deviation at different angles in the horizontal direction and the vertical direction is more similar.

Description

Technical Field

[0001] The embodiments of this application relate to, but are not limited to, the field of display technology, and particularly to a display substrate and a display device. Background Technology

[0002] In recent years, Organic Light Emitting Devices (OLEDs) have gradually attracted more attention as a new type of flat panel display. Due to their characteristics such as active light emission, high brightness, high resolution, wide viewing angle, fast response speed, low power consumption, and flexibility, they have become a popular mainstream display product in the market. As products continue to evolve, customers demand increasingly higher resolution and lower power consumption. This necessitates the development of devices with high efficiency, low voltage, and long lifespan. Device optimization and performance improvement can be achieved by improving the combination of materials in any layer and different layers within the device. Simultaneously, optimizing and increasing the microcavity effect of the entire device can enhance light coupling efficiency.

[0003] As products continue to upgrade, customers have increasingly higher requirements for the display of new products. They are paying more attention to color changes from different viewing angles, as well as color changes at different angles in the horizontal and vertical directions. Furthermore, the difference in color change trends between the horizontal and vertical directions of the display product is an issue that deserves attention and improvement. Summary of the Invention

[0004] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of protection of this application.

[0005] This application provides a display substrate and a display device. The display substrate has a small color shift at different angles, and the color shifts at different angles in the horizontal and vertical directions are more similar.

[0006] This application provides a display substrate comprising: a plurality of light-emitting devices spaced apart in different sub-pixel regions, with adjacent light-emitting devices separated by a pixel definition layer; each light-emitting device comprising a first electrode, a light-emitting functional layer, and a second electrode sequentially disposed on the substrate along a direction away from the substrate; the light-emitting functional layer extending to the surface of the pixel definition layer away from the substrate; the thickness of the light-emitting functional layer changing as it extends from the first electrode to the pixel definition layer; and the region of the light-emitting functional layer corresponding to the contact position between the pixel definition layer and the first electrode being a curved surface with a slope angle of θ.

[0007] When the display substrate displays white light at a grayscale level of 255, each of the light-emitting devices satisfies the following formula:

[0008] |Δu′v′(horizon)-Δu′v′(vertical)| / 0.004≤1 (1)

[0009] θ(horizon)-θ(vertical) ≤10° (2)

[0010] Where θ is the angle between lines BC and BD, B is the intersection of the pixel definition layer and the first electrode, C is the starting point where the thickness of the light-emitting functional layer changes, and D is the ending point where the thickness of the light-emitting functional layer changes; points B, C, and D are selected on the same cross section perpendicular to the substrate.

[0011] |Δu′v′(horizon)-Δu′v′(vertical)| / 0.004 is the absolute value of the color deviation in the horizontal and vertical directions;

[0012]

[0013] u′ n and v′ n Here are the color coordinates for different viewing angles, where u′0 and v′0 are the color coordinates for a 0° viewing angle; different viewing angles refer to the range from -75° to 75°, with each 5° interval starting from 0° as a viewing angle;

[0014] θ (horizon) is the slope angle of the surface in the horizontal direction, and θ (vertical) is the slope angle of the surface in the vertical direction.

[0015] In some embodiments of this application, points C and D may satisfy:

[0016] LC = 101.3% L;

[0017] LD = 101.3% L;

[0018] Wherein, L is the thickness of the light-emitting functional layer located between the first electrode and the second electrode; LC is the thickness of the light-emitting functional layer at point C; and LD is the thickness of the light-emitting functional layer at point D. In some embodiments of this application, the light-emitting device further includes at least two capping layers stacked on the second electrode in a direction away from the substrate, and the refractive index of the capping layers decreases sequentially along the direction away from the substrate.

[0019] In some embodiments of this application, the refractive index difference between two adjacent cover layers is greater than 0.3.

[0020] In some embodiments of this application, the light-emitting device includes a first cover layer and a second cover layer stacked sequentially along a direction away from the substrate, wherein the first cover layer has a refractive index greater than 1.75 in the visible light band, and the second cover layer has a refractive index less than 1.7 in the visible light band.

[0021] In some embodiments of this application, the thickness of the first covering layer can be L1, and the thickness of the second covering layer can be L2; L1 and L2 satisfy: 0.7L1≤L2≤1.3L1.

[0022] In some embodiments of this application, the thickness of the first covering layer can be 600 to 800 angstroms.

[0023] In some embodiments of this application, the plurality of light-emitting devices include red, green, and blue light-emitting devices spaced apart; the thickness of the light-emitting functional layer of the red light-emitting device located between the first electrode and the second electrode is LR, the thickness of the light-emitting functional layer of the green light-emitting device located between the first electrode and the second electrode is LG, and the thickness of the light-emitting functional layer of the blue light-emitting device located between the first electrode and the second electrode is LB; L1 and L2 satisfy at least one of the following conditions:

[0024] a) 1.5 ≤ LR / (L1+L2) ≤ 2;

[0025] b) 1 ≤ LG / (L1 + L2) ≤ 1.6;

[0026] c) 0.7 ≤ LB / (L1 + L2) ≤ 1.4.

[0027] In some embodiments of this application, the first covering layer may include at least one material having the following general formula:

[0028]

[0029] Wherein, Ar1 to Ar3 are each independently hydrogen, deuterium, nitrile, nitro, hydroxyl, carbonyl, ester, imide, amide, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C30 alkoxy, substituted or unsubstituted C5-C30 aryloxy, substituted or unsubstituted C1-C30 alkylthio, arylthio, substituted or unsubstituted C1-C30 alkylsulfonyl, arylsulfonyl, alkenyl, silyl, boron, amino, arylphosphinyl, phosphine oxide, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C5-C30 heteroaryl, or a group represented by general formula II; here, substituted C1-C30 alkyl, substituted C3-C30 cycloalkyl, substituted C1-C30 alkoxy, substituted... C5-C30 aryloxy, substituted C1-C30 alkylthio, substituted C1-C30 alkylsulfonyl, substituted C6-C30 aryl, substituted C5-C30 heteroaryl refer to those substituted with one or more of the following groups: deuterium, nitrile, nitro, hydroxyl, carbonyl, ester, imide, amide, C1-C30 alkyl, C3-C30 cycloalkyl, C1-C30 alkoxy, C5-C30 aryloxy, C1-C30 alkylthio, arylthio, C1-C30 alkylsulfonyl, arylsulfonyl, alkenyl, silyl, boron, amino, arylphosphinyl, phosphine oxide, C6-C30 aryl, C5-C30 heteroaryl; wherein the substituents on adjacent Cs are optionally bonded to each other to form a ring; and at least one of Ar1 to Ar3 is a group represented by general formula II;

[0030] X is either S or O;

[0031] L represents a substituted or unsubstituted C6-C30 arylene or a substituted or unsubstituted C5-C30 heteroarylene; here, substituted C6-C30 arylene or substituted C5-C30 heteroarylene refers to a group substituted with one or more of the following groups: deuterium, nitrile, nitro, hydroxyl, carbonyl, ester, imide, amide, C1-C30 alkyl, C3-C30 cycloalkyl, C1-C30 alkoxy, C5-C30 aryloxy, C1-C30 alkylthio, arylthio, C1-C30 alkylsulfonyl, arylsulfonyl, alkenyl, silyl, boronyl, amino, arylphosphinyl, phosphine oxide, C6-C30 aryl, and C5-C30 heteroarylene.

[0032] In some embodiments of this application, any one or two of Ar1 to Ar3 may be selected from the following groups:

[0033]

[0034]

[0035]

[0036] In some embodiments of this application, L in general formula II may be selected from the following groups:

[0037]

[0038] In some embodiments of this application, the material of the second covering layer may contain any one or more of the following groups: cycloalkyl containing a non-conjugated segment, adamantane containing a non-conjugated segment, amine containing a non-conjugated segment, ester containing a non-conjugated segment, nitro, sulfonic acid, phosphoroxy, halogen, and cyano.

[0039] In some embodiments of this application, the second covering layer may include a material having the following general formula:

[0040]

[0041] Wherein, Ar4 and Ar5 are each independently hydrogen, halogen, nitro, nitrile, substituted or unsubstituted amide, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C5-C30 heteroaryl, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted heteroalkyl, substituted or unsubstituted C1-C30 alkoxy, substituted or unsubstituted thioether, substituted or unsubstituted silyl, substituted or unsubstituted phosphooxy; here, substituted amide, substituted aryl, substituted heteroaryl, substituted alkyl, substituted heteroalkyl, substituted alkoxy, substituted thioether Ether group, substituted silyl group, substituted phosphoxy group refers to a group substituted with one or more of the following groups: deuterium, nitrile, nitro, hydroxyl, carbonyl, ester, imide, amide, C1-C30 alkyl, C3-C30 cycloalkyl, C1-C30 alkoxy, C5-C30 aryloxy, C1-C30 alkylthio, arylthio, C1-C30 alkylsulfonyl, arylsulfonyl, alkenyl, silyl, boronyl, amino, arylphosphinyl, phosphine oxide, C6-C30 aryl, C5-C30 heteroaryl; wherein the substituents on adjacent carbons are optionally bonded to each other to form a ring;

[0042] L1 and L2 are each independently a substituted or unsubstituted C6-C30 arylene or a substituted or unsubstituted C5-C30 heteroarylene; here, substituted C6-C30 arylene and substituted C5-C30 heteroarylene refer to those substituted by one or more of the following groups: deuterium, nitrile, nitro, hydroxyl, carbonyl, ester, imide, amide, C1-C30 alkyl, C3-C30 cycloalkyl, C1-C30 alkoxy, C5-C30 aryloxy, C1-C30 alkylthio, arylthio, C1-C30 alkylsulfonyl, arylsulfonyl, alkenyl, silyl, boronyl, amino, arylphosphinyl, phosphine oxide, C6-C30 aryl, and C5-C30 heteroarylene.

[0043] In some embodiments of this application, the display substrate may further include isolation pillars located on the side of the pixel definition layer away from the substrate, and the isolation pillars are configured to space a common film layer between the plurality of light-emitting devices.

[0044] In some embodiments of this application, the height of the isolation column may be ≤2 micrometers.

[0045] In some embodiments of this application, the light-emitting functional layer may include: a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting layer, a hole blocking layer, an electron transport layer, and an electron injection layer.

[0046] In some embodiments of this application, the material of the hole injection layer may include a transition metal oxide; or, the material of the hole injection layer may include a hole transport material and a p-type dopant.

[0047] The transition metal oxide may include any one or more of the following: molybdenum oxide, titanium oxide, vanadium oxide, rhenium oxide, ruthenium oxide, chromium oxide, zirconium oxide, hafnium oxide, tantalum oxide, silver oxide, tungsten oxide, and manganese oxide.

[0048] The p-type dopant may include any one or more of 2,3,6,7,10,11-hexacyano-1,4,5,8,9,12-hexaazabenzophenanthrene, 2,3,5,6-tetrafluoro-7,7',8,8'-tetracyano-p-benzoquinone, and 1,2,3-tris[(cyano)(4-cyano-2,3,5,6-tetrafluorophenyl)methylene]cyclopropane;

[0049] The hole transport material may include any one or more of aromatic amine hole transport materials, dimethylfluorene hole transport materials, and carbazole hole transport materials.

[0050] In some embodiments of this application, the material of the hole transport layer may include any one or more of aromatic amine hole transport materials, dimethylfluorene hole transport materials, and carbazole hole transport materials.

[0051] In some embodiments of this application, the material of the electron blocking layer may include any one or more of aromatic amine electron blocking materials, dimethylfluorene electron blocking materials, and carbazole electron blocking materials.

[0052] In some embodiments of this application, the light-emitting layer may include a red light-emitting material, a green light-emitting material, or a blue light-emitting material;

[0053] The red luminescent material may include any one or more of the DCM-type red luminescent materials and the metal complex-type red luminescent materials;

[0054] The green luminescent material may include any one or more of the following: coumarin dyes, quinacrine copper derivatives, polycyclic aromatic hydrocarbons, diamine anthracene derivatives, carbazole derivatives, and metal complexes.

[0055] The blue luminescent material may include any one or more of the following: pyrene derivative blue luminescent materials, anthracene derivative blue luminescent materials, fluorene derivative blue luminescent materials, perylene derivative blue luminescent materials, styrene-amine derivative blue luminescent materials, and metal complex blue luminescent materials.

[0056] In some embodiments of this application, the material of the hole blocking layer may include any one or more of the following: benzimidazole derivative hole blocking materials, imidazopyridine derivative hole blocking materials, benzimidazolephenanthridine derivative hole blocking materials, pyrimidine derivative hole blocking materials, triazine derivative hole blocking materials, quinoline derivative hole blocking materials, isoquinoline derivative hole blocking materials, and phenanthrene derivative hole blocking materials.

[0057] In some embodiments of this application, the material of the electron transport layer may include any one or more of the following: benzimidazole derivative electron transport materials, imidazopyridine derivative electron transport materials, benzimidazolephenanthridine derivative electron transport materials, pyrimidine derivative electron transport materials, triazine derivative electron transport materials, quinoline derivative electron transport materials, isoquinoline derivative electron transport materials, and phenanthrene derivative electron transport materials.

[0058] In some embodiments of this application, the material of the electron injection layer may include any one or more of alkali metal electron injection materials and metal electron injection materials.

[0059] This application also provides a display device, which includes the display substrate described in this application embodiment.

[0060] Other features and advantages of this application will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the application. Other advantages of this application can be realized and obtained by means of the solutions described in the description and the accompanying drawings. Attached Figure Description

[0061] The accompanying drawings are used to provide an understanding of the technical solutions of this application and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of this application and do not constitute a limitation on the technical solutions of this application.

[0062] Figure 1 This is a schematic diagram of the structure of a display substrate exemplified in this application;

[0063] Figure 2 for Figure 1 A magnified view of a portion of the image;

[0064] Figure 3 This is a schematic diagram of the structure of a light-emitting device on a display substrate, as exemplified in this application;

[0065] Figure 4 This is a schematic diagram of the slope angle θ in a scanning electron microscope image of an exemplary display substrate of this application;

[0066] Figure 5 A cross-sectional structural schematic diagram of another display substrate as an exemplary embodiment of this application;

[0067] Figure 6 This is a cross-sectional structural schematic diagram of another display substrate according to an exemplary embodiment of this application;

[0068] Figure 7 This is a scanning electron microscope image of an exemplary device according to an embodiment of this application in the horizontal direction;

[0069] Figure 8 for Figure 7 Scanning electron microscope image of the device in the vertical direction;

[0070] Figure 9 This is a scanning electron microscope image of the comparative device in the horizontal direction.

[0071] Figure 10 for Figure 9 Scanning electron microscope image of the device in the vertical direction;

[0072] Figure 11 This is a schematic diagram illustrating the color shift of an exemplary device as a function of angle, according to an embodiment of this application.

[0073] Figure 12 This is a schematic diagram showing the color shift of the comparative device in this application as a function of angle.

[0074] The meanings of the symbols in the attached diagram are as follows:

[0075] 10-First electrode; 20-Light-emitting functional layer; 30-Second electrode; 41-First cover layer; 42-Second cover layer; 100-Substrate; 201-Red light-emitting device; 202-Green light-emitting device; 203-Blue light-emitting device; 301-Pixel definition layer; 302-First isolation structure; 303-Second isolation structure; 401-First encapsulation layer; 402-Second encapsulation layer; 403-Third encapsulation layer. Detailed Implementation

[0076] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be arbitrarily combined with each other.

[0077] The embodiments of this application are not necessarily limited to the dimensions shown in the drawings. The shapes and sizes of the components in the drawings are preferred embodiments, but other shapes and sizes are also possible. Furthermore, the drawings schematically illustrate ideal examples, and the embodiments of this application are not limited to the shapes or values ​​shown in the drawings.

[0078] The size and proportional relationships between the various film layers or components in the accompanying drawings of this application can be used as a reference in actual processes and represent embodiments with better technical effects, but are not limited thereto. For example, the width-to-length ratio of the light-emitting layer, the thickness of each film layer, and the spacing can be adjusted according to actual needs.

[0079] The ordinal numbers such as "first" and "second" in this application are used to avoid confusion among the constituent elements and do not indicate any order, quantity, or importance.

[0080] In this application, for convenience, terms such as "middle," "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer" are used to indicate orientation or positional relationships in conjunction with the accompanying drawings. This is solely for the purpose of facilitating the description and simplification of this specification, and does not imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application. The positional relationships of the constituent elements may be appropriately changed depending on the direction in which each constituent element is described. Therefore, the application is not limited to the terms described in the disclosure and may be appropriately replaced as appropriate.

[0081] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection, an indirect connection via an intermediate component, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0082] In this application, "film" and "layer" can be interchanged. For example, sometimes "light-emitting layer" can be replaced with "light-emitting film". Similarly, sometimes "insulating film" can be replaced with "insulating layer".

[0083] This application provides a display substrate. Figure 1This is a schematic diagram of the structure of a display substrate exemplified in this application; Figure 2 for Figure 1 A magnified view of a portion of the image; Figure 3 This is a schematic diagram of the structure of a light-emitting device on a display substrate, as exemplified by this application (taking red light-emitting device 201 as an example); Figure 4 This is a schematic diagram of the slope angle θ in a scanning electron microscope image of a display substrate that is an example of this application.

[0084] like Figures 1 to 4 As shown, the display substrate includes multiple light-emitting devices spaced apart in different sub-pixel areas, such as a red light-emitting device 201 located in a red sub-pixel, a green light-emitting device 202 located in a green sub-pixel, and a blue light-emitting device 203 located in a blue sub-pixel; adjacent light-emitting devices are separated by an isolation structure, the isolation structure including a pixel definition layer 301 on the substrate between the two adjacent light-emitting devices;

[0085] The light-emitting device includes a first electrode 10, a light-emitting functional layer 20, and a second electrode 30 sequentially disposed on the substrate 100 along a direction away from the substrate 100.

[0086] The light-emitting functional layer extends to the surface of the pixel definition layer 301 on the side away from the substrate 100; the thickness of the light-emitting functional layer changes during the process of the light-emitting functional layer extending from the first electrode 10 to the pixel definition layer 301; the area of ​​the light-emitting functional layer at the contact position between the pixel definition layer 301 and the first electrode 10 is a curved surface, and the slope angle of the curved surface is θ.

[0087] When the display substrate displays white light at a grayscale level of 255, each of the light-emitting devices satisfies the following formula:

[0088] |Δu′v′(horizon)-Δu′v′(vertical)| / 0.004≤1 (1)

[0089] θ(horizon)-θ(vertical) ≤10° (2)

[0090] Where θ is the angle between lines BC and BD, B is the intersection of the pixel definition layer and the first electrode, C is the starting point where the thickness of the light-emitting functional layer changes, and D is the ending point where the thickness of the light-emitting functional layer changes; points B, C, and D are selected on the same cross section perpendicular to the substrate.

[0091] |Δu′v′(horizon)-Δu′v′(vertical)| / 0.004 is the absolute value of the color deviation in the horizontal and vertical directions;

[0092]

[0093] u′ n and v′ n Here are the color coordinates for different viewing angles, where u′0 and v′0 are the color coordinates for a 0° viewing angle; different viewing angles refer to the range from -75° to 75°, with each 5° interval starting from 0° as a viewing angle;

[0094] θ (horizon) is the slope angle of the surface in the horizontal direction, and θ (vertical) is the slope angle of the surface in the vertical direction.

[0095] It should be noted that formulas (1) and (2) are for the same light-emitting device, but multiple different light-emitting devices of the display substrate in this application embodiment satisfy formulas (1) and (2).

[0096] The display substrate of this application embodiment has a smaller color deviation at different angles, and the color deviations at different angles in the horizontal and vertical directions are more similar.

[0097] In some embodiments of this application, points C and D may satisfy:

[0098] LC = 101.3% L;

[0099] LD = 101.3% L;

[0100] Wherein, L is the thickness of the light-emitting functional layer located between the first electrode and the second electrode; LC is the thickness of the light-emitting functional layer at point C; and LD is the thickness of the light-emitting functional layer at point D.

[0101] During the process of extending the light-emitting functional layer from the first electrode to the pixel definition layer, the thickness of the light-emitting functional layer changes as follows: it extends a length of thickness L on the surface of the first electrode, and then the thickness first increases and then decreases during the process of extending to the pixel definition layer, and then it extends a length of thickness L on the surface of the pixel definition layer.

[0102] like Figure 2 and Figure 4As shown, a straight line AB is drawn along the horizontal direction of the upper surface of the first electrode 10 (e.g., an anode), with B being the intersection of the pixel definition layer 301 and the upper surface of the first electrode 10. The thickness of the light-emitting functional layer 20 located between the first electrode 10 and the second electrode 30 is the optical thickness of the EI device. Within the same sub-pixel, each film layer of the light-emitting functional layer is deposited on the relatively flat surface of the first electrode 10, and the thickness of a film layer is the same in different regions. Therefore, along the direction from A to B, the thickness of the light-emitting functional layer is the optical thickness L of the EI device, and the surface of the light-emitting functional layer on the side away from the substrate 100 is parallel to line AB. At the junction of the first electrode 10 and the pixel definition layer 301, there is a corner, and the thickness of the light-emitting functional layer will change, generally increasing first and then decreasing until it returns to approximately the same as the optical thickness L of the EI device. After the thickness of the light-emitting functional layer returns to approximately the same as the optical thickness L of the EI device, the light-emitting functional layer extends for a certain length on the surface of the pixel definition layer 301, maintaining a thickness of approximately L. Therefore, the region corresponding to the contact position between the pixel definition layer 301 and the first electrode 10 of the light-emitting functional layer is a curved surface. One end of this curved surface is the starting point C where the thickness of the light-emitting functional layer changes (e.g., the point where the thickness LC of the light-emitting functional layer is 101.3% L), and the other end of this curved surface is the ending point D where the thickness of the light-emitting functional layer changes (e.g., the point where the thickness LD of the light-emitting functional layer is 101.3% L). The center of this curved surface is the intersection point B of the pixel definition layer 301 and the upper surface of the first electrode 10. Points B, C, and D are selected on the same cross-section perpendicular to the substrate 100. Therefore, the slope angle θ of this curved surface is the angle between the straight lines BC and BD.

[0103] When calculating the value of θ, you can first use trigonometric functions to calculate θ1 and θ2, and then calculate the value of θ.

[0104] In some embodiments of this application, θ(horizon) > 30° and θ(vertical) > 30°.

[0105] In some embodiments of this application, the light-emitting device may further include at least two capping layers stacked along a direction away from the substrate, and the refractive index of the capping layers decreases sequentially along the direction away from the substrate.

[0106] The design of multiple overlays can make the slope angle θ of the curved surface more stable.

[0107] In some embodiments of this application, the refractive index difference between two adjacent cover layers can be greater than 0.3.

[0108] In some embodiments of this application, such as Figure 3As shown, the light-emitting device may include a first cover layer 41 and a second cover layer 42 stacked sequentially along a direction away from the substrate 100. The first cover layer 41 has a refractive index greater than 1.75 in the visible light band, and the second cover layer 42 has a refractive index less than 1.7 in the visible light band.

[0109] For example, the refractive index n1 of the first covering layer in the visible light band can satisfy: 1.75≤n1≤2.

[0110] For example, the refractive index n2 of the second coating layer in the visible light band can satisfy: 1.4≤n2≤1.7.

[0111] In some embodiments of this application, the thickness of the first covering layer can be L1, and the thickness of the second covering layer can be L2; L1 and L2 satisfy: 0.7L1≤L2≤1.3L1.

[0112] For example, L2 can be 0.7L1, 0.8L1, 0.9L1, L1, 1.1L1, 1.2L1 or 1.3L1.

[0113] When L1 and L2 satisfy 0.7L1≤L2≤1.3L1, it is beneficial for the display substrate to display white light at 255 gray levels, and the light-emitting device satisfies the above formulas (1) and (2).

[0114] In some embodiments of this application, the thickness of the first cover layer can be from 600 angstroms to 800 angstroms. For example, the thickness of the first cover layer can be 600 angstroms, 620 angstroms, 640 angstroms, 660 angstroms, 680 angstroms, 700 angstroms, 720 angstroms, 740 angstroms, 760 angstroms, 780 angstroms or 800 angstroms.

[0115] In some embodiments of this application, the plurality of light-emitting devices include red light-emitting devices, green light-emitting devices, and blue light-emitting devices spaced apart;

[0116] The thickness of the light-emitting functional layer of the red light-emitting device located between the first electrode and the second electrode is LR; the thickness of the light-emitting functional layer of the green light-emitting device located between the first electrode and the second electrode is LG; and the thickness of the light-emitting functional layer of the blue light-emitting device located between the first electrode and the second electrode is LB; L1 and L2 satisfy at least one of the following conditions:

[0117] a) 1.5 ≤ LR / (L1+L2) ≤ 2;

[0118] b) 1 ≤ LG / (L1 + L2) ≤ 1.6;

[0119] c) 0.7 ≤ LB / (L1 + L2) ≤ 1.4.

[0120] In some embodiments of this application, L1 and L2 simultaneously satisfy 1.5≤LR / (L1+L2)≤2, 1≤LG / (L1+L2)≤1.6 and 0.7≤LB / (L1+L2)≤1.4.

[0121] When L1 and L2 satisfy any one or more of the following conditions: 1.5≤LR / (L1+L2)≤2, 1≤LG / (L1+L2)≤1.6, 0.7≤LB / (L1+L2)≤1.4, it is beneficial for the display substrate to satisfy the above formulas (1) and (2) when displaying white light at 255 gray levels.

[0122] In some embodiments of this application, the first covering layer may include at least one material having the following general formula:

[0123]

[0124] Wherein, Ar1 to Ar3 are each independently hydrogen, deuterium, nitrile, nitro, hydroxyl, carbonyl, ester, imide, amide, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C30 alkoxy, substituted or unsubstituted C5-C30 aryloxy, substituted or unsubstituted C1-C30 alkylthio, arylthio, substituted or unsubstituted C1-C30 alkylsulfonyl, arylsulfonyl, alkenyl, silyl, boron, amino, arylphosphinyl, phosphine oxide, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C5-C30 heteroaryl, or a group represented by general formula II; here, substituted C1-C30 alkyl, substituted C3-C30 cycloalkyl, substituted C1-C30 alkoxy, substituted... C5-C30 aryloxy, substituted C1-C30 alkylthio, substituted C1-C30 alkylsulfonyl, substituted C6-C30 aryl, substituted C5-C30 heteroaryl refer to those substituted with one or more of the following groups: deuterium, nitrile, nitro, hydroxyl, carbonyl, ester, imide, amide, C1-C30 alkyl, C3-C30 cycloalkyl, C1-C30 alkoxy, C5-C30 aryloxy, C1-C30 alkylthio, arylthio, C1-C30 alkylsulfonyl, arylsulfonyl, alkenyl, silyl, boron, amino, arylphosphinyl, phosphine oxide, C6-C30 aryl, C5-C30 heteroaryl; wherein the substituents on adjacent Cs are optionally bonded to each other to form a ring; and at least one of Ar1 to Ar3 is a group represented by general formula II;

[0125] X is either S or O;

[0126] L represents a substituted or unsubstituted C6-C30 arylene or a substituted or unsubstituted C5-C30 heteroarylene; here, substituted C6-C30 arylene or substituted C5-C30 heteroarylene refers to a group substituted with one or more of the following groups: deuterium, nitrile, nitro, hydroxyl, carbonyl, ester, imide, amide, C1-C30 alkyl, C3-C30 cycloalkyl, C1-C30 alkoxy, C5-C30 aryloxy, C1-C30 alkylthio, arylthio, C1-C30 alkylsulfonyl, arylsulfonyl, alkenyl, silyl, boronyl, amino, arylphosphinyl, phosphine oxide, C6-C30 aryl, and C5-C30 heteroarylene.

[0127] In some embodiments of this application, any one or two of Ar1 to Ar3 may be selected from the following groups:

[0128]

[0129]

[0130]

[0131] In some embodiments of this application, L in general formula II may be selected from the following groups:

[0132]

[0133]

[0134] In some embodiments of this application, the material of the second covering layer may contain any one or more of the following groups: cycloalkyl containing a non-conjugated segment, adamantane containing a non-conjugated segment, amine containing a non-conjugated segment, ester containing a non-conjugated segment, nitro, sulfonic acid, phosphoroxy, halogen, and cyano.

[0135] In some embodiments of this application, the second covering layer may include a material having the following general formula:

[0136]

[0137] Wherein, Ar4 and Ar5 are each independently hydrogen, halogen, nitro, nitrile, substituted or unsubstituted amide, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C5-C30 heteroaryl, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted heteroalkyl, substituted or unsubstituted C1-C30 alkoxy, substituted or unsubstituted thioether, substituted or unsubstituted silyl, substituted or unsubstituted phosphooxy; here, substituted amide, substituted aryl, substituted heteroaryl, substituted alkyl, substituted heteroalkyl, substituted alkoxy, substituted thioether Ether group, substituted silyl group, substituted phosphoxy group refers to a group substituted with one or more of the following groups: deuterium, nitrile, nitro, hydroxyl, carbonyl, ester, imide, amide, C1-C30 alkyl, C3-C30 cycloalkyl, C1-C30 alkoxy, C5-C30 aryloxy, C1-C30 alkylthio, arylthio, C1-C30 alkylsulfonyl, arylsulfonyl, alkenyl, silyl, boronyl, amino, arylphosphinyl, phosphine oxide, C6-C30 aryl, C5-C30 heteroaryl; wherein the substituents on adjacent carbons are optionally bonded to each other to form a ring;

[0138] L1 and L2 are each independently a substituted or unsubstituted C6-C30 arylene or a substituted or unsubstituted C5-C30 heteroarylene; here, substituted C6-C30 arylene and substituted C5-C30 heteroarylene refer to those substituted by one or more of the following groups: deuterium, nitrile, nitro, hydroxyl, carbonyl, ester, imide, amide, C1-C30 alkyl, C3-C30 cycloalkyl, C1-C30 alkoxy, C5-C30 aryloxy, C1-C30 alkylthio, arylthio, C1-C30 alkylsulfonyl, arylsulfonyl, alkenyl, silyl, boronyl, amino, arylphosphinyl, phosphine oxide, C6-C30 aryl, and C5-C30 heteroarylene.

[0139] In some embodiments of this application, different light-emitting devices are separated by pixel definition layers. However, there may be shared film layers, such as encapsulation layers, that extend continuously between multiple light-emitting devices. These shared film layers connect different sub-pixels, which may lead to color crosstalk. To solve this problem, the display substrate may further include isolation pillars located on the side of the pixel definition layer away from the substrate, and the isolation pillars are configured to space the shared film layers between the multiple light-emitting devices.

[0140] In some embodiments of this application, the height of the isolation column may be ≤2 micrometers.

[0141] When the height of the isolation column does not exceed 2 micrometers, the obstruction of light by the isolation column can be reduced.

[0142] In some embodiments of this application, the light-emitting functional layer may further include: a hole injection layer (HIL), a hole transport layer (HTL), an electron block layer (EBL), an emitting layer (EML), a hole block layer (HBL), an electron transport layer (ETL), and an electron injection layer (EIL).

[0143] In some embodiments of this application, the material of the hole injection layer may include a transition metal oxide; or, the material of the hole injection layer may include a hole transport material and a p-type dopant.

[0144] In some embodiments of this application, the transition metal oxide may include any one or more of molybdenum oxide, titanium oxide, vanadium oxide, rhenium oxide, ruthenium oxide, chromium oxide, zirconium oxide, hafnium oxide, tantalum oxide, silver oxide, tungsten oxide, and manganese oxide;

[0145] In some embodiments of this application, the p-type dopant may include any one or more of 2,3,6,7,10,11-hexacyano-1,4,5,8,9,12-hexaazabenzophenanthrene, 2,3,5,6-tetrafluoro-7,7',8,8'-tetracyano-p-quinone dimethyl (F4TCNQ), and 1,2,3-tris[(cyano)(4-cyano-2,3,5,6-tetrafluorophenyl)methylene]cyclopropane.

[0146] In some embodiments of this application, the hole transport material may include any one or more of aromatic amine hole transport materials, dimethylfluorene hole transport materials, and carbazole hole transport materials.

[0147] In some embodiments of this application, the material of the hole transport layer may include any one or more of aromatic amine hole transport materials, dimethylfluorene hole transport materials, and carbazole hole transport materials.

[0148] For example, the hole transport material may include any one or more of 4,4'-bis[N-(1-naphthyl)-N-phenylamino]biphenyl (NPB), N,N'-bis(3-methylphenyl)-N,N'-diphenyl-[1,1'-biphenyl]-4,4'-diamine (TPD), 4-phenyl-4'-(9-phenylfluorene-9-yl)triphenylamine (BAFLP), 4,4'-bis[N-(9,9-dimethylfluorene-2-yl)-N-phenylamino]biphenyl (DFLDPBi), 4,4'-bis(9-carbazolyl)biphenyl (CBP), and 9-phenyl-3-[4-(10-phenyl-9-anthrayl)phenyl]-9H-carbazole (PCzPA).

[0149] In some embodiments of this application, the material of the electron blocking layer may include any one or more of aromatic amine electron blocking materials, dimethylfluorene electron blocking materials, and carbazole electron blocking materials.

[0150] For example, the material of the electron blocking layer may include any one or more of 4,4'-bis[N-(1-naphthyl)-N-phenylamino]biphenyl (NPB), N,N'-bis(3-methylphenyl)-N,N'-diphenyl-[1,1'-biphenyl]-4,4'-diamine (TPD), 4-phenyl-4'-(9-phenylfluorene-9-yl)triphenylamine (BAFLP), 4,4'-bis[N-(9,9-dimethylfluorene-2-yl)-N-phenylamino]biphenyl (DFLDPBi), 4,4'-bis(9-carbazolyl)biphenyl (CBP), and 9-phenyl-3-[4-(10-phenyl-9-anthrayl)phenyl]-9H-carbazole (PCzPA).

[0151] In some embodiments of this application, the light-emitting layer may include a red light-emitting material, a green light-emitting material, or a blue light-emitting material.

[0152] The red luminescent material may include any one or more of the DCM-type red luminescent materials and the metal complex-type red luminescent materials.

[0153] For example, the red luminescent material may include any one or more of 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran (DCM), 4-(dicyanomethylene)-2-tert-butyl-6-(1,1,7,7-tetramethyljulonidin-9-enyl)-4H-pyran (DCJTB), bis(1-phenylisoquinoline)(acetylacetone)iridium(III))(Ir(piq)2(acac)), octaethylporphyrin platinum (abbreviated as PtOEP), and bis(2-(2'-benzothiophene)pyridine-N,C3')(acetylacetone)iridium (abbreviated as Ir(btp)2(acac).

[0154] The green luminescent material may include any one or more of the following: coumarin dyes, quinacrine copper derivatives, polycyclic aromatic hydrocarbons, diamine anthracene derivatives, carbazole derivatives, and metal complexes.

[0155] For example, the green luminescent material may include any one or more of the following: coumarin 6 (C-6), coumarin 545T (C-525T), quinacridone copper (QA), N,N'-dimethylquinacridone (DMQA), 5,12-diphenylnaphthonaphthalene (DPT), N10,N10'-diphenyl-N10,N10'-dibenzoyl-9,9'-dianthracene-10,10'-diamine (abbreviated as BA-NPB), aluminum(III)tris(8-hydroxyquinoline) (abbreviated as Alq3), iridium(2-phenylpyridine)triiridium (Ir(ppy)3), and iridium(2-phenylpyridine)acetylacetonate (Ir(ppy)2(acac)).

[0156] The blue luminescent material may include any one or more of the following: pyrene derivative blue luminescent materials, anthracene derivative blue luminescent materials, fluorene derivative blue luminescent materials, perylene derivative blue luminescent materials, styrene-amine derivative blue luminescent materials, and metal complex blue luminescent materials.

[0157] For example, the blue luminescent material may include any one or more of N1,N6-bis([1,1'-biphenyl]-2-yl)-N1,N6-bis([1,1'-biphenyl]-4-yl)pyrene-1,6-diamine, 9,10-bis-(2-naphthyl)anthracene (ADN), 2-methyl-9,10-bis-2-naphthylanthracene (MADN), 2,5,8,11-tetra-tert-butylperylene (TBPe), 4,4'-bis[4-(diphenylamino)styryl]biphenyl (BDAV Bi), 4,4'-bis[4-(di-p-tolylamino)styryl]biphenyl (DPAV Bi), and bis(4,6-difluorophenylpyridine-C2,N)pyridinecarboxyiridium (FIrpic).

[0158] In some embodiments of this application, the material of the hole blocking layer may include any one or more of the following: benzimidazole derivative hole blocking materials, imidazopyridine derivative hole blocking materials, benzimidazolephenanthridine derivative hole blocking materials, pyrimidine derivative hole blocking materials, triazine derivative hole blocking materials, quinoline derivative hole blocking materials, isoquinoline derivative hole blocking materials, and phenanthrene derivative hole blocking materials.

[0159] For example, the hole-blocking layer material may include any one or more of 2-(4-biphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD), 1,3-bis[5-(p-tert-butylphenyl)-1,3,4-oxadiazole-2-yl]benzene (OXD-7), 3-(4-tert-butylphenyl)-4-phenyl-5-(4-biphenyl)-1,2,4-triazole (TAZ), 3-(4-tert-butylphenyl)-4-(4-ethylphenyl)-5-(4-biphenyl)-1,2,4-triazole (p-EtTAZ), phenanthroline (BPhen), (BCP), and 4,4'-bis(5-methylbenzoxazol-2-yl)stilbene (BzOs).

[0160] In some embodiments of this application, the material of the electron transport layer may include any one or more of the following: benzimidazole derivative electron transport materials, imidazopyridine derivative electron transport materials, benzimidazolephenanthridine derivative electron transport materials, pyrimidine derivative electron transport materials, triazine derivative electron transport materials, quinoline derivative electron transport materials, isoquinoline derivative electron transport materials, and phenanthrene derivative electron transport materials.

[0161] For example, the material of the electron transport layer may include any one or more of 2-(4-biphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD), 1,3-bis[5-(p-tert-butylphenyl)-1,3,4-oxadiazole-2-yl]benzene (OXD-7), 3-(4-tert-butylphenyl)-4-phenyl-5-(4-biphenyl)-1,2,4-triazole (TAZ), 3-(4-tert-butylphenyl)-4-(4-ethylphenyl)-5-(4-biphenyl)-1,2,4-triazole (p-EtTAZ), phenanthroline (BPhen), (BCP), and 4,4'-bis(5-methylbenzoxazol-2-yl)stilbene (BzOs).

[0162] In some embodiments of this application, the material of the electron injection layer may include any one or more of alkali metal electron injection materials and metal electron injection materials.

[0163] For example, the electron injection layer material may include any one or more of LiF, Yb, Mg, and Ca.

[0164] In some embodiments of this application, the first electrode may include an anode, which may be formed using a material with a high work function. For example, for bottom-emitting devices, the anode may be a transparent oxide material, such as indium tin oxide (ITO) or indium zinc oxide (IZO). Alternatively, for top-emitting devices, the anode may be a composite structure of metal and transparent oxide, such as Ag / ITO, Ag / IZO, Al / ITO, Al / IZO, or ITO / Ag / ITO, which can ensure good reflectivity.

[0165] In some embodiments of this application, the second electrode may include a cathode, and the second electrode may be formed of a metal with a low work function such as Al, Ag, or Mg, or an alloy containing a metal material with a low work function.

[0166] In some embodiments of this application, the display substrate may be an electroluminescent device, such as an OLED.

[0167] The display substrate of this application embodiment can be obtained through various manufacturing processes, as illustrated below.

[0168] In one exemplary embodiment, a display substrate can be manufactured using a fine mask evaporation process, which may include the following steps:

[0169] S1: A high work function material, such as ITO, IZO or ZnO, is deposited on the substrate 100 to form an anode;

[0170] S2: An organic insulating material such as polyimide, benzocyclobutene resin, acrylate, etc., is deposited on a substrate 100 with an anode, and the film layer formed by the above organic insulating material is patterned to form a plurality of pixel definition layers 301 with spaced distribution.

[0171] S3: Multiple light-emitting functional layers of the light-emitting device are deposited using a fine mask and a regular mask to obtain a red light-emitting device 201 located in a red sub-pixel, a green light-emitting device 202 located in a green sub-pixel, and a blue light-emitting device 203 located in a blue sub-pixel; adjacent light-emitting devices are separated by a pixel definition layer 301.

[0172] Among them, the functional layer prepared with a fine mask is patterned and deposited only in the pixel area, while the functional layer prepared with a regular mask is a shared film layer that covers the pixel definition layer and the pixel area.

[0173] S4: Sequentially deposit a first encapsulation layer 401, a second encapsulation layer 402, and a third encapsulation layer 403 covering the light-emitting functional layer on the substrate surface obtained in S3, to obtain the following: Figure 1 The display substrate shown.

[0174] In an exemplary embodiment, a display substrate can be manufactured using a fine mask evaporation process and a photolithography process, which may include the following steps:

[0175] S10: A high work function material, such as ITO, IZO or ZnO, is deposited on the substrate 100 to form an anode;

[0176] S20: An organic insulating material such as polyimide, benzocyclobutene resin, acrylate, etc., is deposited on a substrate 100 with an anode, and the film layer formed by the above organic insulating material is patterned to form a plurality of pixel definition layers 301 with spaced distribution.

[0177] S30: Organic insulating materials such as polyimide, benzocyclobutene resin, and acrylate are deposited again on the substrate surface obtained in S20 to form an insulating layer covering each pixel definition layer 301; a negative photosensitive material is used in conjunction with a photomask, and the insulating layer is patterned by photolithography to form a first isolation structure 302 on each pixel definition layer 301. The first isolation structure 302 can be an isolation pillar, for example, an inverted trapezoidal isolation pillar;

[0178] S40: Multiple light-emitting functional layers of the light-emitting device are deposited using a fine mask and a regular mask to obtain a red light-emitting device 201 located in a red sub-pixel, a green light-emitting device 202 located in a green sub-pixel, and a blue light-emitting device 203 located in a blue sub-pixel; adjacent light-emitting devices are separated by a pixel definition layer 301 and a first isolation structure 302.

[0179] S50: On the substrate surface obtained in S30, a first encapsulation layer 401, a second encapsulation layer 402, and a third encapsulation layer 403 covering the light-emitting functional layer are sequentially deposited to obtain the following: Figure 5 The display substrate shown.

[0180] The design and manufacturing costs of fine photomasks are relatively high. Photolithography can be used to reduce the use of fine photomasks and lower costs.

[0181] In one exemplary embodiment, the display substrate can be manufactured by photolithography, which may include the following steps:

[0182] S100: A high work function material, such as ITO, IZO or ZnO, is deposited on the substrate 100 to form an anode;

[0183] S200: An organic insulating material such as polyimide, benzocyclobutene resin, acrylate, etc., is deposited on a substrate 100 with an anode, and the film layer formed by the above organic insulating material is patterned to form a plurality of pixel definition layers 301 with spaced distribution.

[0184] S300: A first conductive material and a second conductive material, such as a metal or conductive metal oxide, are sequentially deposited on the substrate surface obtained in S20. Under the same etching conditions, the etching rate of the second conductive material is lower than that of the first conductive material. Then, an etching reagent is used to etch the film layer formed by the first and second conductive materials to form a first isolation structure 302 and a second isolation structure 303 located on the side of the pixel definition layer 301 away from the substrate. The first isolation structure 302 can be a columnar isolation pillar, and the second isolation structure 303 can be a layered isolation layer. The orthogonal projection of the first isolation structure 302 on the substrate 100 falls within the range of the orthogonal projection of the second isolation structure 303 on the substrate 100. By using conductive materials to form the first isolation structure 302 and the second isolation structure 303, the anode can be led out of the light-emitting device.

[0185] S400: Without using a fine mask, deposit the red light-emitting functional layer and cathode layer of the red light-emitting device on the substrate obtained in S300, and form the first encapsulation layer 401 on the cathode using chemical vapor deposition; wherein, the cathode and the first encapsulation layer 401 simultaneously cover the red sub-pixel, green sub-pixel, blue sub-pixel, each pixel definition layer 301, each second isolation structure 302 and each third isolation structure 303; deposit negative photoresist in the area corresponding to the red sub-pixel, and etch away the red light-emitting functional layer, cathode layer and first encapsulation layer on the remaining areas, leaving only the red light-emitting functional layer, cathode layer and first encapsulation layer 401 of the red sub-pixel, thus completing the fabrication and encapsulation of the red light-emitting device;

[0186] This step involves independently packaging the red light-emitting device, which prevents it from being affected by subsequent photolithography processes.

[0187] S500: Following step S400, complete the fabrication and packaging of the green light-emitting device in the green sub-pixel, and complete the fabrication and packaging of the blue light-emitting device in the blue sub-pixel; as shown... Figure 6 As shown, the first encapsulation layer 401 of the three sub-pixels is connected together to form a continuous first encapsulation layer 401;

[0188] S600: A second encapsulation layer 402 covering the first encapsulation layer 401, the second isolation structure 302 and the third isolation structure 303 are formed on the substrate surface obtained in S500 by inkjet printing process.

[0189] S700: A third encapsulation layer 403 is deposited on the second encapsulation layer 402 to obtain the following... Figure 6 The display substrate shown.

[0190] This application also provides a display device, which includes the display substrate described in this application embodiment.

[0191] In some embodiments of this application, the display device can be any product or component with display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, navigator, in-vehicle display, smartwatch, or smart bracelet.

[0192] The advantages of the display substrate of this application will be illustrated below through specific device embodiments.

[0193] The structural formulas of some of the raw materials used are shown below.

[0194]

[0195]

[0196] Device structure and thickness

[0197] Devices in embodiments of this application:

[0198] ITO / m-MTDATA:F4TCNQ 3%10nm / m-MTDATA 100nm / BEBL 5nm / BH:BD 5%20nm / TPBI 5nm / BCP:Liq 1:1 30nm / Yb 1nm / Mg:Ag 13nm / CP1 65nm / CP2 85nm

[0199] ITO / m-MTDATA:F4TCNQ 3%10nm / m-MTDATA 100nm / GEBL 30nm / GH:GD 10%35nm / TPBI 5nm / BCP:Liq 1:1 30nm / Yb 1nm / Mg:Ag 13nm / CP1 65nm / CP2 85nm

[0200] ITO / m-MTDATA:F4TCNQ 3%10nm / m-MTDATA 100nm / REBL 80nm / RH:RD 3%45nm / TPBI 5nm / BCP:Liq 1:1 30nm / Yb 1nm / Mg:Ag 13nm / CP1 65nm / CP2 85nm

[0201] Comparison devices

[0202] The only difference between the device and the embodiment of this application is that LiF is used instead of CP2.

[0203] Both the devices in this application and the comparative devices are packaged in TFE.

[0204] Figure 7 This is a scanning electron microscope image of an exemplary device according to an embodiment of this application in the horizontal direction; Figure 8 for Figure 7 Scanning electron microscope image of the device in the vertical direction; Figure 9 This is a scanning electron microscope image of the comparative device in the horizontal direction. Figure 10 for Figure 9 The scanning electron microscope image of the device in the vertical direction.

[0205] The slope angle θ of the device in this application embodiment and the comparative device are shown in Table 1 and Figures 7 to 10 As shown.

[0206] Table 1

[0207] Comparison devices CP1 / LiF 73° 89° 16° Devices in the embodiments of this application CP1 / CP2 113° 115° 2°

[0208] Figure 11 This is a schematic diagram illustrating the color shift of an exemplary device as a function of angle, according to an embodiment of this application. Figure 12 This is a schematic diagram showing the color shift of the comparative device in this application as a function of angle.

[0209] The color shifts of the devices in the embodiments and the comparative devices are shown in Table 2 and Figures 11 to 12 As shown.

[0210] Table 2

[0211]

[0212]

[0213] It can be seen that, whether in the horizontal or vertical direction, at the same angle, the color shift of the device in this application embodiment is significantly smaller than that of the comparative device; moreover, the absolute values ​​of the color deviation values ​​of the device in this application embodiment at different angles in the horizontal and vertical directions are significantly smaller, indicating that the color shift of the device in this application embodiment at different angles in the horizontal and vertical directions is more similar.

[0214] While the embodiments disclosed in this application are as described above, the content is merely for the purpose of facilitating understanding of this application and is not intended to limit this application. Any person skilled in the art to which this application pertains may make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in this application; however, the scope of protection of this application shall still be determined by the scope defined in the appended claims.

Claims

1. A display substrate, characterized in that, include: Multiple light-emitting devices are spaced apart in different sub-pixel regions, with adjacent light-emitting devices separated by a pixel definition layer. Each light-emitting device includes a first electrode, a light-emitting functional layer, a second electrode, and at least two cover layers sequentially disposed on the substrate in a direction away from the substrate. The light-emitting functional layer, the second electrode, and the at least two cover layers extend to the surface of the pixel definition layer away from the substrate. As the light-emitting functional layer, the second electrode, and the at least two cover layers extend from the first electrode to the pixel definition layer, the total thickness of the light-emitting functional layer, the second electrode, and the at least two cover layers changes. The region corresponding to the contact position between the pixel definition layer and the first electrode of the light-emitting functional layer, the second electrode, and the at least two cover layers is a curved surface with a slope angle of θ. When the display substrate displays white light at a grayscale level of 255, each of the light-emitting devices satisfies the following formula: | (horizon)- (vertical)| / 0.004≤1 (1) θ(horizon)-θ(vertical)≤10° (2) Where θ is the angle between lines BC and BD, B is the intersection of the pixel definition layer and the first electrode, C is the starting point where the total thickness of the light-emitting functional layer, the second electrode, and the at least two cover layers changes, and D is the ending point where the total thickness of the light-emitting functional layer, the second electrode, and the at least two cover layers changes; points B, C, and D are selected on the same cross section perpendicular to the substrate. | (Horizon) - (vertical) | / 0.004 represents the absolute value of the color deviation in the horizontal and vertical directions; ； and For color coordinates from different viewpoints, and The color coordinates are at a 0° viewing angle; different viewing angles refer to the range from -75° to 75°, with each 5° interval starting from 0° as a viewing angle; θ (horizon) is the slope angle of the surface in the horizontal direction, and θ (vertical) is the slope angle of the surface in the vertical direction; The plurality of light-emitting devices include red, green, and blue light-emitting devices spaced apart. The total thickness of the light-emitting functional layer, the second electrode, and the at least two capping layers of the red light-emitting device located between the first and second electrodes is LR; the total thickness of the light-emitting functional layer, the second electrode, and the at least two capping layers of the green light-emitting device located between the first and second electrodes is LG; and the total thickness of the light-emitting functional layer, the second electrode, and the at least two capping layers of the blue light-emitting device located between the first and second electrodes is LB. The at least two capping layers include a first capping layer and a second capping layer stacked sequentially in a direction away from the substrate. The thickness of the first capping layer is L1, and the thickness of the second capping layer is L2. L1 and L2 satisfy the following: a) 1.5≤LR / (L1+L2)≤2; b) 1≤LG / (L1+L2)≤1.6; c) 0.7≤LB / (L1+L2)≤1.4; The material of the capping layer furthest from the substrate contains any one or more of the following groups: cycloalkyl containing a non-conjugated segment, adamantane containing a non-conjugated segment, amine containing a non-conjugated segment, ester containing a non-conjugated segment, nitro, sulfonic acid, halogen, and cyano. The adamantane containing the non-conjugated segment is a material having the following general formula: Formula III Wherein, Ar4 and Ar5 are each independently hydrogen, halogen, nitro, nitrile, substituted or unsubstituted amide, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted heteroalkyl, substituted or unsubstituted C1-C30 alkoxy, substituted or unsubstituted thioether, substituted or unsubstituted silyl, or substituted or unsubstituted phosphooxy; here, substituted amide, substituted aryl, substituted alkyl, substituted heteroalkyl, substituted alkoxy, substituted thioether, or substituted silyl Alkyl, substituted phosphoxy means substituted with one or more of the following groups: deuterium, nitrile, nitro, hydroxyl, carbonyl, ester, imide, amide, C1-C30 alkyl, C3-C30 cycloalkyl, C1-C30 alkoxy, C5-C30 aryloxy, C1-C30 alkylthio, arylthio, C1-C30 alkylsulfonyl, arylsulfonyl, alkenyl, silyl, boronyl, amino, arylphosphinyl, phosphine oxide, C6-C30 aryl; wherein the substituents on adjacent carbons optionally combine with each other to form a ring; L1 and L2 are each independently a substituted or unsubstituted C6-C30 arylene group; here, a substituted C6-C30 arylene group is one that is substituted by one or more of the following groups: deuterium, nitrile, nitro, hydroxyl, carbonyl, ester, imide, amide, C1-C30 alkyl, C3-C30 cycloalkyl, C1-C30 alkoxy, C5-C30 aryloxy, C1-C30 alkylthio, arylthio, C1-C30 alkylsulfonyl, arylsulfonyl, alkenyl, silyl, boron, amino, arylphosphinyl, phosphine oxide, and C6-C30 aryl.

2. The display substrate according to claim 1, characterized in that, Points C and D satisfy: LC = 101.3% L; LD = 101.3% L; Wherein, L is the total thickness of the light-emitting functional layer, the second electrode, and the at least two covering layers located between the first electrode and the second electrode; LC is the thickness of the light-emitting functional layer, the second electrode, and the at least two covering layers at point C; and LD is the thickness of the light-emitting functional layer, the second electrode, and the at least two covering layers at point D.

3. The display substrate according to claim 1, characterized in that, The refractive index of the capping layer decreases sequentially along the direction away from the substrate.

4. The display substrate according to claim 3, characterized in that, The refractive index difference between two adjacent cover layers is greater than 0.

3.

5. The display substrate according to claim 4, characterized in that, The first coating layer has a refractive index greater than 1.75 in the visible light band, and the second coating layer has a refractive index less than 1.7 in the visible light band.

6. The display substrate according to claim 5, characterized in that, L1 and L2 satisfy: 0.7L1≤L2≤1.3L1.

7. The display substrate according to claim 6, characterized in that, The thickness of the first covering layer is 600 to 800 angstroms.

8. The display substrate according to any one of claims 5 to 7, characterized in that, The first covering layer comprises at least one material having the following general formula: Wherein, Ar1 to Ar3 are each independently hydrogen, deuterium, nitrile, nitro, hydroxyl, carbonyl, ester, imide, amide, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C30 alkoxy, substituted or unsubstituted C5-C30 aryloxy, substituted or unsubstituted C1-C30 alkylthio, arylthio, substituted or unsubstituted C1-C30 alkylsulfonyl, arylsulfonyl, alkenyl, silyl, boron, amino, arylphosphinyl, phosphine oxide, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C5-C30 heteroaryl, or a group represented by general formula II; here, substituted C1-C30 alkyl, substituted C3-C30 cycloalkyl, substituted C1-C30 alkoxy, substituted... C5-C30 aryloxy, substituted C1-C30 alkylthio, substituted C1-C30 alkylsulfonyl, substituted C6-C30 aryl, substituted C5-C30 heteroaryl refer to those substituted with one or more of the following groups: deuterium, nitrile, nitro, hydroxyl, carbonyl, ester, imide, amide, C1-C30 alkyl, C3-C30 cycloalkyl, C1-C30 alkoxy, C5-C30 aryloxy, C1-C30 alkylthio, arylthio, C1-C30 alkylsulfonyl, arylsulfonyl, alkenyl, silyl, boron, amino, arylphosphinyl, phosphine oxide, C6-C30 aryl, C5-C30 heteroaryl; wherein the substituents on adjacent Cs are optionally bonded to each other to form a ring; and at least one of Ar1 to Ar3 is a group represented by general formula II; X is either S or O; L represents a substituted or unsubstituted C6-C30 arylene or a substituted or unsubstituted C5-C30 heteroarylene; here, substituted C6-C30 arylene or substituted C5-C30 heteroarylene refers to a group substituted with one or more of the following groups: deuterium, nitrile, nitro, hydroxyl, carbonyl, ester, imide, amide, C1-C30 alkyl, C3-C30 cycloalkyl, C1-C30 alkoxy, C5-C30 aryloxy, C1-C30 alkylthio, arylthio, C1-C30 alkylsulfonyl, arylsulfonyl, alkenyl, silyl, boronyl, amino, arylphosphinyl, phosphine oxide, C6-C30 aryl, and C5-C30 heteroarylene.

9. The display substrate according to claim 8, characterized in that, One or two of Ar1 to Ar3 are selected from the following groups: 。 10. The display substrate according to claim 8, characterized in that, In general formula II, L is selected from the following groups: 。 11. The display substrate according to any one of claims 1 to 7, characterized in that, It also includes isolation pillars located on the side of the pixel definition layer away from the substrate, the isolation pillars being configured to space a common film layer between the plurality of light-emitting devices; The height of the isolation column is ≤2 micrometers.

12. The display substrate according to any one of claims 1 to 7, characterized in that, The light-emitting functional layer includes: a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting layer, a hole blocking layer, an electron transport layer, and an electron injection layer.

13. The display substrate according to claim 12, characterized in that, The hole injection layer is made of a transition metal oxide; or, the hole injection layer is made of a hole transport material and a p-type dopant. The transition metal oxides include any one or more of the following: molybdenum oxide, titanium oxide, vanadium oxide, rhenium oxide, ruthenium oxide, chromium oxide, zirconium oxide, hafnium oxide, tantalum oxide, silver oxide, tungsten oxide, and manganese oxide. The p-type dopant includes any one or more of 2,3,6,7,10,11-hexacyano-1,4,5,8,9,12-hexaazabenzophenanthrene, 2,3,5,6-tetrafluoro-7,7',8,8'-tetracyano-p-benzoquinone, and 1,2,3-tris[(cyano)(4-cyano-2,3,5,6-tetrafluorophenyl)methylene]cyclopropane; The hole transport material includes any one or more of aromatic amine hole transport materials, dimethylfluorene hole transport materials, and carbazole hole transport materials.

14. The display substrate according to claim 12, characterized in that, The material of the hole transport layer includes any one or more of aromatic amine hole transport materials, dimethylfluorene hole transport materials, and carbazole hole transport materials.

15. The display substrate according to claim 12, characterized in that, The electron blocking layer is made of any one or more of the following: aromatic amine electron blocking materials, dimethylfluorene electron blocking materials, and carbazole electron blocking materials.

16. The display substrate according to claim 12, characterized in that, The light-emitting layer includes red light-emitting material, green light-emitting material, or blue light-emitting material; The red luminescent material includes any one or more of the DCM-type red luminescent materials and the metal complex-type red luminescent materials; The green luminescent material includes any one or more of the following: coumarin dyes, quinacrine copper derivatives, polycyclic aromatic hydrocarbons, diamine anthracene derivatives, carbazole derivatives, and metal complexes. The blue luminescent material includes any one or more of the following: pyrene derivative blue luminescent materials, anthracene derivative blue luminescent materials, fluorene derivative blue luminescent materials, perylene derivative blue luminescent materials, styrene-amine derivative blue luminescent materials, and metal complex blue luminescent materials.

17. The display substrate according to claim 12, characterized in that, The hole-blocking layer is made of any one or more of the following: benzimidazole derivative hole-blocking materials, imidazopyridine derivative hole-blocking materials, benzimidazolephenanthridine derivative hole-blocking materials, pyrimidine derivative hole-blocking materials, triazine derivative hole-blocking materials, quinoline derivative hole-blocking materials, isoquinoline derivative hole-blocking materials, and phenanthrene derivative hole-blocking materials.

18. The display substrate according to claim 12, characterized in that, The material of the electron transport layer includes any one or more of the following: benzimidazole derivative electron transport materials, imidazopyridine derivative electron transport materials, benzimidazolephenanthridine derivative electron transport materials, pyrimidine derivative electron transport materials, triazine derivative electron transport materials, quinoline derivative electron transport materials, isoquinoline derivative electron transport materials, and phenanthrene derivative electron transport materials.

19. The display substrate according to claim 12, characterized in that, The material of the electron injection layer includes any one or more of alkali metal electron injection materials and metal electron injection materials.

20. A display device, characterized in that, Includes a display substrate according to any one of claims 1 to 19.

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