Display panel, display module and display apparatus
Patent Information
- Application Number
- PCT/CN2026/072011
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2025-02-26
- Filing Date
- 2026-01-12
- Publication Date
- 2026-09-03
Smart Images
Figure CN2026072011_03092026_PF_FP_ABST
Abstract
Description
A display panel, a display module, and a display device. Cross-reference of related applications
[0001] This application claims priority to Chinese patent application No. 202510220425.1, filed on February 26, 2025, the entire contents of which are incorporated herein by reference. Technical Field
[0002] This disclosure belongs to the field of display device technology, and particularly relates to a display panel, display module and display device. Background Technology
[0003] In related technologies, white organic light-emitting diode (WOLED) devices often suffer from poor spectral stability.
[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention
[0005] This disclosure provides a display panel, a display module, and a display device.
[0006] This disclosure provides a display panel, which includes a substrate and multiple color light-emitting devices disposed on the substrate according to a preset rule. Each light-emitting device includes a first electrode layer, a first stacked layer, a charge generation layer, a second stacked layer, and a second electrode layer stacked sequentially. The first stacked layer includes a blue light-emitting layer. The charge generation layer includes a hole charge generation layer and an electron charge generation layer disposed adjacent to each other, with the electron charge generation layer located near the first stacked layer. The second stacked layer includes a red light-emitting layer and a green light-emitting layer disposed adjacent to each other, with the green light-emitting layer located near the second electrode layer of the red light-emitting layer. The second stacked layer further includes a second hole blocking layer, which is located on the side of the green light-emitting layer near the second electrode layer. A first distance exists between the side of the red light-emitting layer near the green light-emitting layer and the side of the hole charge generating layer near the electron charge generating layer, and a second distance exists between the side of the green light-emitting layer near the red light-emitting layer and the side of the second electrode layer near the green light-emitting layer. The first distance is less than the second distance. The material used to prepare the second hole blocking layer has a highest occupied molecular orbital energy level of 6.0 eV to 6.3 eV and a lowest unoccupied molecular orbital energy level of 2.4 eV to 2.8 eV.
[0007] In some implementations, the first distance is The second distance is The difference between the second distance and the first distance is less than or equal to
[0008] In some embodiments, a third distance exists between the side of the second hole-blocking layer near the green light-emitting layer and the side of the second electrode layer near the green light-emitting layer, the third distance being...
[0009] In some embodiments, the material used to prepare the second hole-blocking layer includes a compound represented by general formula I:
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[0011]
[0012] In general formula I, L is selected from the groups shown in formulas L1 to L6:
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[0019] In general formula I, R1 and R2 may be the same or different from each other, and R1 and R2 are each independently selected from hydrogen, deuterium, halogen, cyano, nitro, alkyl with 1 to 40 substituted or unsubstituted carbon atoms, alkenyl with 2 to 40 substituted or unsubstituted carbon atoms, alkynyl with 2 to 40 substituted or unsubstituted carbon atoms, cycloalkyl with 3 to 40 substituted or unsubstituted carbon atoms, heterocycloalkyl with 3 to 40 substituted or unsubstituted carbon atoms, aryl with 6 to 60 substituted or unsubstituted carbon atoms, heteroaryl with 5 to 60 substituted or unsubstituted carbon atoms, alkoxy with 1 to 40 substituted or unsubstituted carbon atoms, aryloxy with 6 to 60 substituted or unsubstituted carbon atoms, alkylsilyl with 3 to 40 substituted or unsubstituted carbon atoms, and arylsilyl with 6 to 60 substituted or unsubstituted carbon atoms; in general formula I, R3 and R4 are the same as each other. Alternatively, R3 and R4 may be independently selected from hydrogen, deuterium, halogen, cyano, nitro, substituted or unsubstituted alkyl with 1 to 40 carbon atoms, substituted or unsubstituted alkenyl with 2 to 40 carbon atoms, substituted or unsubstituted alkynyl with 2 to 40 carbon atoms, substituted or unsubstituted cycloalkyl with 3 to 40 carbon atoms, substituted or unsubstituted heterocyclic alkyl with 3 to 40 carbon atoms, substituted or unsubstituted aryl with 6 to 60 carbon atoms, substituted or unsubstituted heteroaryl with 5 to 60 carbon atoms, substituted or unsubstituted alkoxy with 1 to 40 carbon atoms, substituted or unsubstituted aryloxy with 6 to 60 carbon atoms, substituted or unsubstituted alkylsilyl with 3 to 40 carbon atoms, and substituted or unsubstituted arylsilyl with 6 to 60 carbon atoms. R3 and R4 may be unfused or fused together to form a five-membered or six-membered ring.
[0020] In some embodiments, in general formula I, R1 and R2 may be the same or different from each other, and R1 and R2 are each independently selected from aryl groups having 6 to 18 carbon atoms, whether substituted or unsubstituted; in general formula I, R3 and R4 may be the same or different from each other, and R3 and R4 are each independently selected from hydrogen or deuterium; or, R3 and R4 are each independently selected from alkyl groups having 1 to 6 carbon atoms, whether substituted or unsubstituted, and R3 and R4 are fused together to form a five-membered ring or a six-membered ring.
[0021] In some embodiments, the compound represented by general formula I is represented by any one of the compounds represented by formulas 1 to 20:
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[0042] In some embodiments, the light-emitting device further includes a thin-film encapsulation layer and a filter layer. The thin-film encapsulation layer is disposed on the side of the second electrode layer away from the second stacked layer, and the filter layer is disposed on the side of the thin-film encapsulation layer away from the second electrode layer. The filter layer includes a red filter layer, a green filter layer, and a blue filter layer. The red filter layer is configured to emit red light, the green filter layer is configured to emit green light, and the blue filter layer is configured to emit blue light.
[0043] In some embodiments, the light-emitting device further includes a planarization layer disposed on the side of the filter layer near the thin-film encapsulation layer and / or the planarization layer disposed on the side of the filter layer away from the thin-film encapsulation layer.
[0044] This disclosure provides a display module, which includes the display panel described above.
[0045] This disclosure provides a display device, which includes the display module described above.
[0046] The embodiments disclosed herein have at least the following beneficial effects:
[0047] The aforementioned display panel, by making the first distance between the side of the red light emitting layer near the green light emitting layer and the side of the hole charge generation layer near the electron charge generation layer smaller than the second distance between the side of the green light emitting layer near the red light emitting layer and the side of the second electrode layer near the green light emitting layer, can adjust the interface position between the green light emitting layer and the red light emitting layer to a certain extent. At the same time, by matching the energy level of the material used to prepare the second hole blocking layer with the first and second distances, the imbalance between holes and electrons can be reduced to a certain extent. This can reduce the recombination center shift under different current / voltage driving conditions to a certain extent, and bring the recombination center as close as possible to the interface between the red light emitting layer and the green light emitting layer. This can improve the spectral stability of the display panel, as well as its efficiency and lifespan. Attached Figure Description
[0048] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0049] Figure 1 shows a schematic diagram of the structure of the display panel in an embodiment of this disclosure.
[0050] Figure label:
[0051] 100, First electrode layer; 200, First stacked layer; 210, First hole injection layer; 220, First hole transport layer; 230, First electron blocking layer; 240, Blue light emitting layer; 250, First hole blocking layer; 260, First electron transport layer; 300, Charge generation layer; 310, Electron charge generation layer; 320, Hole charge generation layer; 400, Second stacked layer; 410, Second hole transport layer; 420, Second electron blocking layer; 430, Red light emitting layer; 440, Green light emitting layer; 450, Second hole blocking layer; 460, Second electron transport layer; 470, Second electron injection layer; 500, Second electrode layer; 600, Thin film encapsulation layer; 700, Filter layer; 800, Planarization layer; 810, First planarization layer; 820, Second planarization layer; First distance L1; Second distance L2; Third distance L3. Detailed Implementation
[0052] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. Based on the embodiments of this disclosure, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this disclosure.
[0053] Furthermore, reference numerals and / or reference letters may be repeated in different examples in this disclosure. Such repetition is for simplification and clarity purposes and does not in itself indicate a relationship between the various embodiments and / or settings discussed. In addition, this disclosure provides examples of various specific processes and materials, but those skilled in the art will recognize the application of other processes and / or the use of other materials.
[0054] This disclosure is described below with reference to the accompanying drawings and specific embodiments:
[0055] Organic light-emitting diode (OLED) devices have gained an increasingly important position in people's production and daily lives. As a new generation of display technology, OLED devices have advantages such as soft light emission, fast response speed, rich color, and wide viewing angle, and are gradually being regarded by the industry as the most ideal display technology with broad application prospects.
[0056] Depending on the direction of light emission, OLED devices can be divided into bottom-emitting OLED devices and top-emitting OLED devices. In bottom-emitting OLED devices, the thin-film transistor portion cannot transmit light, resulting in a smaller light-emitting area. In top-emitting OLED devices, the transparent electrode is located on the light-emitting side of the light-emitting layer, and the reflective electrode is located on the light-incident side of the light-emitting layer. This allows light to be emitted from the opposite direction to the substrate, increasing the light transmission area. Therefore, top-emitting OLED devices are the most widely studied type of OLED device.
[0057] White organic light-emitting diode (WOLED) devices achieve different colors by transmitting white light through a filter layer, and have the advantage of being easy to implement top emission.
[0058] In related technologies, WOLED devices typically place the red and green light-emitting layers in direct contact. However, under different current driving conditions, the recombination center often shifts, resulting in poor spectral stability of WOLEDs and affecting their efficiency and lifespan.
[0059] The inventors of this disclosure have discovered through research that, in WOLD devices, due to the limitations of materials currently used in WOLED devices, the electron migration rate is relatively low, the hole injection efficiency is relatively high, and the thickness of the green light-emitting layer is greater than that of the red light-emitting layer. When the green light-emitting layer and the red light-emitting layer are placed close to each other, an imbalance between holes and electrons is easily caused, which leads to the displacement of the recombination center and thus affects the efficiency and lifespan of the WOLED device.
[0060] Based on the inventor's research findings, the following inventive concept is proposed: By controlling the size of the first distance between the side of the red light emitting layer near the green light emitting layer and the side of the hole charge generation layer near the electron charge generation layer, and the second distance between the side of the green light emitting layer near the red light emitting layer and the side of the second electrode layer near the green light emitting layer, the thickness difference between the green light emitting layer and the red light emitting layer can be offset to a certain extent. At the same time, by using a hole blocking layer material with energy level matching, the holes and electrons can be balanced, thereby avoiding the recombination center shift and improving the efficiency and lifespan of WOLED devices.
[0061] Based on the above inventive concept, the present disclosure proposes a display panel, as shown in FIG1. The display panel includes a substrate and multiple light-emitting devices of various colors disposed on the substrate according to a preset rule. The light-emitting devices include a first electrode layer, a first stacked layer, a charge generating layer, a second stacked layer and a second electrode layer disposed in sequence.
[0062] The first stacked layer includes a blue light-emitting layer;
[0063] The charge generation layer includes a hole charge generation layer and an electron charge generation layer disposed adjacent to each other, with the electron charge generation layer located on the side closer to the first stacked layer;
[0064] The second stacked layer includes a red light emitting layer and a green light emitting layer disposed adjacent to each other, with the green light emitting layer located on the side of the red light emitting layer closer to the second electrode layer; the second stacked layer also includes a second hole blocking layer, which is located on the side of the green light emitting layer closer to the second electrode layer.
[0065] Among them, there is a first distance between the side of the red light emitting layer near the green light emitting layer and the side of the hole charge generating layer near the electron charge generating layer, and there is a second distance between the side of the green light emitting layer near the red light emitting layer and the side of the second electrode layer near the green light emitting layer. The first distance is smaller than the second distance. The highest occupied molecular orbital energy level of the material used to prepare the second hole blocking layer is 6.0 eV to 6.3 eV, and the lowest unoccupied molecular orbital energy level is 2.4 eV to 2.8 eV.
[0066] The display panel proposed in this disclosure, by making the first distance between the side of the red light emitting layer near the green light emitting layer and the side of the hole charge generation layer near the electron charge generation layer smaller than the second distance between the side of the green light emitting layer near the red light emitting layer and the side of the second electrode layer near the green light emitting layer, can adjust the interface position between the green light emitting layer and the red light emitting layer to a certain extent. At the same time, by matching the energy level of the material used to prepare the second hole blocking layer with the first and second distances, the imbalance between holes and electrons can be reduced to a certain extent. This can reduce the recombination center shift under different current / voltage driving conditions to a certain extent, and make the recombination center as close as possible to the interface between the red light emitting layer and the green light emitting layer. This can improve the spectral stability of the display panel, as well as its efficiency and lifespan.
[0067] As one optional implementation, as shown in Figure 1, the first distance is The second distance is The difference between the second distance and the first distance is less than or equal to
[0068] In some embodiments of this disclosure, the inventors have discovered through research that the offset of the composite center is generally less than As shown in Figure 1, by making the first distance... The second distance is The difference between the second distance and the first distance is less than or equal to This ensures that the first distance is less than the second distance, so that the difference between the second distance and the first distance can offset the offset of the composite center to a certain extent, making the composite center as close as possible to the interface between the red light emitting layer and the green light emitting layer.
[0069] In some embodiments of this disclosure, optionally, the difference between the second distance and the first distance is _____.
[0070] In some embodiments of this disclosure, optionally, the first distance is The second distance is The difference between the second distance and the first distance is
[0071] In some embodiments of this disclosure, optionally, the first distance can be The second distance can be The difference between the second distance and the first distance can be
[0072] As an optional implementation, as shown in Figure 1, there is a third distance between the side of the second hole blocking layer near the green light-emitting layer and the side of the second electrode layer near the green light-emitting layer. The third distance is...
[0073] In some embodiments of this disclosure, as shown in FIG1, the third distance between the side of the second hole blocking layer near the green light-emitting layer and the side of the second electrode layer near the green light-emitting layer is... In other words, the thickness of the green light-emitting layer is... This can reduce the thickness difference between the green and red light-emitting layers to a certain extent, while ensuring that the interface position between the green and red light-emitting layers is compatible with the recombination center.
[0074] As an alternative implementation, the material used to prepare the second hole-blocking layer includes compounds represented by general formula I;
[0075]
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[0077] In general formula I, L is selected from the groups shown in formulas L1 to L6:
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[0084] In general formula I, R1 and R2 may be the same as or different from each other, and R1 and R2 are each independently selected from hydrogen, deuterium, halogen, cyano, nitro, alkyl with 1 to 40 substituted or unsubstituted carbon atoms, alkenyl with 2 to 40 substituted or unsubstituted carbon atoms, alkynyl with 2 to 40 substituted or unsubstituted carbon atoms, cycloalkyl with 3 to 40 substituted or unsubstituted carbon atoms, heterocycloalkyl with 3 to 40 substituted or unsubstituted carbon atoms, aryl with 6 to 60 substituted or unsubstituted carbon atoms, heteroaryl with 5 to 60 substituted or unsubstituted carbon atoms, alkoxy with 1 to 40 substituted or unsubstituted carbon atoms, aryloxy with 6 to 60 substituted or unsubstituted carbon atoms, alkylsilyl with 3 to 40 substituted or unsubstituted carbon atoms, and arylsilyl with 6 to 60 substituted or unsubstituted carbon atoms.
[0085] In general formula I, R3 and R4 may be the same as or different from each other, and R3 and R4 are each independently selected from hydrogen, deuterium, halogen, cyano, nitro, substituted or unsubstituted alkyl with 1 to 40 carbon atoms, substituted or unsubstituted alkenyl with 2 to 40 carbon atoms, substituted or unsubstituted ynyl with 2 to 40 carbon atoms, substituted or unsubstituted cycloalkyl with 3 to 40 carbon atoms, substituted or unsubstituted heterocyclic alkyl with 3 to 40 nuclei, substituted or unsubstituted The ring has 6 to 60 aryl carbon atoms, 5 to 60 heteroaryl carbon atoms (substituted or unsubstituted), 1 to 40 alkoxy carbon atoms (substituted or unsubstituted), 6 to 60 aryloxy carbon atoms (substituted or unsubstituted), 3 to 40 alkylsilyl carbon atoms (substituted or unsubstituted), and 6 to 60 arylsilyl carbon atoms (substituted or unsubstituted), wherein R3 and R4 are not fused together or are fused together to form a five-membered or six-membered ring.
[0086] In some embodiments of this disclosure, the compound represented by the above general formula I can be used as a material for preparing the second hole blocking layer. The highest occupied molecular orbital energy level of the compound represented by general formula I is 6.0 eV to 6.3 eV, and the lowest unoccupied molecular orbital energy level is 2.4 eV to 2.8 eV. This allows the energy level of the second hole blocking layer in the display panel to match and adapt to the imbalance between holes and electrons, as well as the thickness difference between the green light emitting layer phase and the red light emitting layer. This allows the position of the recombination center to be controlled, enabling the recombination center to be located closer to the interface between the green light emitting layer phase and the red light emitting layer. In other words, it can reduce the offset of the recombination center to a certain extent, thereby improving the spectral stability of the display panel, as well as improving the efficiency and lifespan of the display panel.
[0087] As an alternative embodiment, in general formula I, R1 and R2 may be the same or different from each other, and R1 and R2 are each independently selected from aryl groups with 6 to 18 carbon atoms, whether substituted or unsubstituted; in general formula I, R3 and R4 may be the same or different from each other, and R3 and R4 are each independently selected from hydrogen or deuterium; or, R3 and R4 are each independently selected from alkyl groups with 1 to 6 carbon atoms, whether substituted or unsubstituted, and R3 and R4 are fused together to form a five-membered ring or a six-membered ring.
[0088] In some embodiments of this disclosure, when the compound represented by the above general formula I is used as the material for preparing the second hole blocking layer, it is possible to achieve a maximum occupied molecular orbital energy level of 6.0 eV or higher, which can effectively block holes and thus provide higher luminous efficiency, improve the stability of the display panel, and thus improve the efficiency and lifespan of the display panel.
[0089] As an alternative implementation, the compound represented by formula I is represented by any one of the compounds represented by formulas 1 to 20:
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[0111] In some embodiments of this disclosure, the compounds represented by Formulas 1 to 20 can satisfy the requirement that the highest occupied molecular orbital energy level reaches above 6.0 eV, effectively blocking holes and thus providing higher luminous efficiency, improving the stability of the display panel, and thus improving the efficiency and lifespan of the display panel.
[0112] In some embodiments of this disclosure, the compounds represented by formulas 1 to 20 can be prepared using methods known in the art. For example, the preparation method of the compound represented by formula 5 of this disclosure includes the following steps:
[0113] <Step 1> Synthesis of 2'-bromospiro[cyclohexane-1,9'-fluorene]
[0114]
[0115] 2-Bromo-9H-fluorene (100 g, 407.96 mmol) was added to a 2 L reactor, followed by the injection of 500 mL of THF and stirring. The reactor was then placed in an ice bath with the internal temperature set to -0 °C. KOtBu (93.8 g, 1019 mmol) was added in portions over 15 minutes, followed by stirring for 10 minutes. 1,5-Dibromopentane (42.7 g, 407.93 mmol) was added dropwise over 5 minutes. The mixture was slowly heated to room temperature and stirred for 8 hours. After the reaction was complete, the mixture was extracted with dichloromethane and filtered through MgSO4. After removing the solvent from the filtered organic layer, column chromatography was used to obtain the target compound 2'-bromospiro[cyclohexane-1,9'-fluorene] (78.2 g, yield 61%).
[0116] 1 H-NMR: δ1.58(m,2H)1.77(m,8H),7.33(m,2H),7.55(d,1H),7.74(d,1H),7.85(m,3H)
[0117] <Step 2> Synthesis of Core 1
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[0119] 2'-Bromospiro[cyclohexane-1,9'-fluorene] (78.2.2 g, 249.6 mmol) and 4,4,4',4',5,5,5',5'-octamethyl-2,2'-bis(1,3,2-dioxaborolane) (76 g, 299.5 mmol), along with Pd(dppf)Cl2 (5.48 g, 7.48 mmol), KOAc (73.5 g, 748.9 mmol), and Xphos (11.9 g, 24.96 mmol), were added to 750 mL of 1,4-dioxane and heated under reflux for 12 hours. After the reaction was complete, the mixture was extracted with dichloromethane and filtered after adding MgSO4. After removing the solvent from the filtered organic layer, the target compound nucleus 1 (70.2 g, yield 78%) was obtained by column chromatography.
[0120] 1 H-NMR: δ1.57(s,12H),1.65(m,2H),1.78(m,8H),7.40(m,2H),7.62(d,1H),7.82(d,1H),7.88(m,3H)
[0121] <Step 3> Synthesis of the compound shown in Formula 5
[0122]
[0123] Nucleus 1 (6.3 g, 17.4 mmol), 2-(3-chlorophenyl)-4,6-diphenyl-1,3,5-triazine (5.0 g, 14.5 mmol), Pd(OAc)2 (0.09 g, 0.43 mmol), Cs2CO3 (9.4 g, 29.1 mmol), and Xphos (0.69 g, 1.45 mmol) were added to 100 mL of toluene, 25 mL of EtOH, and 25 mL of H2O. The mixture was heated under reflux for 12 hours. After the reaction was complete, the mixture was extracted with dichloromethane and filtered with MgSO4. After removing the solvent from the filtered organic layer, column chromatography was used to obtain the target compound Inv3 (5.3 g, 67% yield).
[0124] As an optional implementation, the second stacked layer further includes any one or more of a second electron injection layer, a second electron transport layer, a second electron blocking layer, and a second hole transport layer; the second electron injection layer is located on the side of the second electrode layer near the second hole blocking layer, the second electron transport layer is located on the side of the second electron injection layer near the second hole blocking layer, the second electron blocking layer is located on the side of the red light emitting layer near the hole charge generating layer, and the second hole transport layer is located on the side of the second electron blocking layer near the hole charge generating layer.
[0125] In some embodiments of this disclosure, the display panel may, as required by design, include one or more layers of a second electron injection layer, a second electron transport layer, a second electron blocking layer, and a second hole transport layer in the second stacked layer.
[0126] As an optional implementation, the first stacked layer further includes any one or more of the following: a first hole injection layer, a first hole transport layer, a first electron blocking layer, a first hole blocking layer, and a first electron transport layer. The first hole injection layer is located on the side of the first electrode near the blue light emitting layer, the first hole transport layer is located on the side of the first hole injection layer near the blue light emitting layer, the first electron blocking layer is located on the side of the first hole transport layer near the blue light emitting layer, the first hole blocking layer is located on the side of the blue light emitting layer near the electron charge generation layer, and the first electron transport layer is located on the side of the first hole blocking layer near the electron charge generation layer.
[0127] In some embodiments of this disclosure, the display panel may, according to design requirements, include one or more of the following: a first hole injection layer, a first hole transport layer, a first electron blocking layer, a first hole blocking layer, and a first electron transport layer.
[0128] In some embodiments of this disclosure, the substrate may be selected from any transparent rigid or flexible substrate material, such as glass or polyimide.
[0129] In some embodiments of this disclosure, the first electrode layer may be an anode, and the anode is prepared from an electrode material with a high work function. Optionally, the anode material may be a metallic material, such as an alloy composed of any one or more of copper (Cu), gold (Au), silver (Ag), iron (Fe), chromium (Cr), nickel (Ni), palladium (Pd), and platinum (Pt); the anode material may also be a metal oxide, such as any one or more of indium oxide (In2O3), zinc oxide (ZnO), indium tin oxide (ITO), and indium zinc oxide (IZO). The anode material may also be a self-conductive polymer, such as any one or more of polyaniline, polypyrrole, poly(3-methylthiophene), carbon nanotubes (CNTs), and graphene oxide (GO). The anode material may also be a composite electrode formed from the above materials, such as ITO / Ag / ITO, Ag / IZO, CNT / ITO, CNT / IZO, GO / ITO, and GO / IZO. In addition to the anode materials listed above, the anode preparation materials can also be materials and combinations thereof that facilitate hole injection, including known materials suitable for anodes.
[0130] In some embodiments of this disclosure, the second electrode layer can be a cathode. The cathode material can be an electrode material with a low work function to facilitate electron injection into the organic layer between the first and second electrode layers. Optionally, the second electrode layer can possess both good light transmittance and conductivity. Optionally, the cathode material can be a metallic material, metal oxide, or metal alloy, such as aluminum (Al), silver (Ag), gold (Au), magnesium (Mg), calcium (Ca), ytterbium (Yb), indium (In), lithium (Li), potassium (K), sodium (Na), tin (Sn), titanium (Ti), lead (Pb), samarium (Sm), yttrium (Y), indium tin oxide (ITO), magnesium-silver alloy (Mg:Ag), ytterbium-gold alloy (Yb:Au), and ytterbium-silver alloy (Yb:Ag). The cathode can be any one of lithium-aluminum alloy (Li:Al) and lithium-calcium-magnesium alloy (Li:Ca:Al); the cathode material can also be a multilayer structure composed of metals and metal compounds, such as magnesium / aluminum (Mg / Al), magnesium / silver (Mg / Ag), aluminum / silver (Al / Ag), aluminum / gold (Al / Au), ytterbium / gold (Yb / Au), ytterbium / silver (Yb / Ag), calcium / magnesium (Ca / Mg), calcium / silver (Ca / Ag), and barium / silver (Ba / Ag). In addition to the cathode materials listed above, the cathode material can also be materials and combinations thereof that facilitate electron injection, including known materials suitable for cathodes.
[0131] In some embodiments of this disclosure, the material for preparing the first hole injection layer can be an inorganic oxide, such as 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; the material for preparing the first hole injection layer can be a dopant of a strong electron-withdrawing system, such as F4TCNQ or HATCN; the material for preparing the first hole injection layer can also be p-type doped using p-dopant, and the first hole injection layer is formed by co-evaporation.
[0132] In some embodiments of this disclosure, the materials used to prepare the first hole transport layer and the second hole transport layer may be the same or different. Optionally, the materials used to prepare the first hole transport layer and the second hole transport layer can be independently selected from aromatic amines or carbazole materials with hole transport properties. For example, 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) can be used.
[0133] In some embodiments of this disclosure, the materials used to prepare the first electron blocking layer and the second electron blocking layer may be the same or different. Optionally, the materials for preparing the first electron blocking layer and the second electron blocking layer can be independently selected from aromatic amines or carbazole materials with hole transport properties. For example, 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) can be used.
[0134] In some embodiments of this disclosure, the material used to prepare the first hole-blocking layer can be the same as that used to prepare the second hole-blocking layer. Alternatively, the material used to prepare the first hole-blocking layer can be different from that used to prepare the second hole-blocking layer. For example, the material used to prepare the first hole-blocking layer can be a heterocyclic aromatic compound, such as imidazole derivatives, imidazopyridine derivatives, and benzimidazolephenanthridine derivatives; the material used to prepare the first hole-blocking layer can be pyrimidine derivatives and triazine derivatives; the material used to prepare the first hole-blocking layer can also be a compound containing a nitrogen six-membered ring structure, such as quinoline derivatives, isoquinoline derivatives, and phenanthreneroline derivatives, including compounds with phosphine oxide substituents on the heterocycle; 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), copper oxychloride (BCP), 4,4'-bis(5-methylbenzoxazol-2-yl)stilbene (BzOs), and 1,3,4-diazole, etc.
[0135] In some embodiments of this disclosure, the materials used to prepare the first electron transport layer and the second electron transport layer may be the same or different. The materials used to prepare the first electron transport layer and the second electron transport layer may be selected from materials with good electron transport properties. Optionally, the materials used to prepare the first electron transport layer and the second electron transport layer may each be independently selected from heterocyclic aromatic compounds, such as imidazole derivatives, imidazopyridine derivatives, and benzimidazolephenanthridine derivatives; the materials used to prepare the first electron transport layer and the second electron transport layer may each be independently selected from pyrimidine derivatives and triazine derivatives; the materials used to prepare the first electron transport layer and the second electron transport layer may each be independently selected from compounds containing a nitrogen six-membered ring structure, such as quinoline derivatives, isoquinoline derivatives, and phenanthreneroline derivatives, including compounds with phosphine oxide substituents on the heterocycle .... The materials used to prepare the transport layer can be independently selected from 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), copper oxychloride (BCP), 4,4'-bis(5-methylbenzoxazol-2-yl)stilbene (BzOs), and 1,3,4-diazole, etc.
[0136] In some embodiments of this disclosure, the material used to prepare the second electron injection layer is selected as a material capable of transporting electrons, and it also needs to have the effect of injecting electrons from the cathode and excellent thin film formation performance. The material used to prepare the second electron injection layer can be any one or more of alkali metal materials, metallic materials, alkali metal compounds, and metallic compounds, such as any one or more of lithium fluoride (LiF), ytterbium (Yb), magnesium (Mg), and calcium (Ca).
[0137] In some embodiments of this disclosure, the blue light-emitting layer, the red light-emitting layer, and the green light-emitting layer are all light-emitting layers. The materials used to prepare the light-emitting layers can be phosphorescent host materials and phosphorescent guest materials; they can also be fluorescent host materials and fluorescent guest materials. It should be noted that the phosphorescent host material can include one material or two or more materials; the fluorescent host material can include one material or two or more materials.
[0138] In some embodiments of this disclosure, the host material of the blue light-emitting layer can be selected from anthracene derivatives ADN and MADN; the guest material of the blue light-emitting layer can be selected from pyrene derivatives, fluorene derivatives, perylene derivatives, styrene-amine derivatives, and metal complexes, such as TBPe, BDAVBi, DPAVBi, and FIrpic.
[0139] In some embodiments of this disclosure, the host material of the red light emitting layer can be selected from DCM series materials, such as DCM, DCJTB and DCJTI; the guest material of the red light emitting layer can be a metal complex, such as Ir(piq)2(acac), PtOEP and Ir(btp)2(acac).
[0140] In some embodiments of this disclosure, the host material of the green light-emitting layer can be selected from coumarin dyes, quinacrine copper derivatives, polycyclic aromatic hydrocarbons, diamine anthracene derivatives, and carbazole derivatives, such as DMQA, BA-NPB, and Alq3; the guest material of the green light-emitting layer can be a metal complex, such as Ir(ppy)3 and Ir(ppy)2(acac).
[0141] As an optional implementation, the blue light emitting layer may have a first light-emitting auxiliary layer on the side near the first hole transport layer, and / or the red light emitting layer may have a second light-emitting auxiliary layer on the side near the second hole transport layer, and / or the green light emitting layer may have a third light-emitting auxiliary layer on the side near the second hole transport layer.
[0142] In some embodiments of this disclosure, the first light-emitting auxiliary layer has good hole transport performance and can form a multilayer hole transport layer structure with the first hole transport layer. The first light-emitting auxiliary layer mainly assists the first hole transport layer, enabling holes transferred from the anode to move smoothly to the blue light-emitting layer, and can block electrons transferred from the cathode to confine electrons within the blue light-emitting layer, reducing the potential barrier between the first hole transport layer and the blue light-emitting layer. This can, to a certain extent, reduce the driving voltage of the display panel and improve the hole utilization rate, thereby improving the efficiency and lifespan of the display panel. The functions of the second and third light-emitting auxiliary layers are the same as those of the first light-emitting auxiliary layer, and will not be repeated here. The materials used to prepare the first, second, and third light-emitting auxiliary layers can each be independently selected from aromatic amine or carbazole materials, such as CBP and PCzPA.
[0143] As an optional implementation, the light-emitting device further includes a thin-film encapsulation layer and a filter layer. The thin-film encapsulation layer is disposed on the side of the second electrode layer away from the second stacked layer, and the filter layer is disposed on the side of the thin-film encapsulation layer away from the second electrode layer. The filter layer includes a red filter layer, a green filter layer, and a blue filter layer. The red filter layer is configured to emit red light, the green filter layer is configured to emit green light, and the blue filter layer is configured to emit blue light.
[0144] In some embodiments of this disclosure, a thin-film encapsulation layer covers the side of the second electrode layer away from the second stacked layer to isolate the display panel from the outside world and prevent water and oxygen from eroding the internal structure of the display panel.
[0145] In some embodiments of this disclosure, the multi-color light-emitting devices in the display panel may include blue, red, and green light-emitting devices. Correspondingly, the filter layer includes a red filter layer, a green filter layer, and a blue filter layer. The red filter layer is configured to emit red light, the green filter layer is configured to emit green light, and the blue filter layer is configured to emit blue light. Thus, the red light-emitting device combined with the red filter layer enables the display panel to emit red light, the green light-emitting device combined with the green filter layer enables the display panel to emit green light, and the blue light-emitting device combined with the blue filter layer enables the display panel to emit blue light.
[0146] As an optional implementation, the light-emitting device further includes a planarization layer, which is disposed on the side of the filter layer close to the thin film encapsulation layer and / or on the side of the filter layer away from the thin film encapsulation layer.
[0147] In some embodiments of this disclosure, by providing a planarization layer on the side of the filter layer near the thin film encapsulation layer and / or on the side of the filter layer away from the thin film encapsulation layer, on the one hand, the planarization layer can provide a surface with a certain flatness, which facilitates the setting of subsequent structural layers; on the other hand, the planarization layer can reduce the internal stress concentration, making the display panel more uniform and stable.
[0148] In some embodiments of this disclosure, as shown in FIG1, the display panel includes, in sequence, an anode, a first hole injection layer (HIL1), a first hole transport layer (HTL1), a first electron blocking layer (EBL1), a blue light emitting layer (B-EML), a first hole blocking layer (HBL1), a first electron transport layer (ETL1), an electron charge generating layer (N-CGL), a hole charge generating layer (P-CGL), a second hole transport layer (HTL2), a second electron blocking layer (EBL2), a red light emitting layer (R-EML), a green light emitting layer (G-EML), a second hole blocking layer (HBL2), a second electron transport layer (ETL2), a second electron injection layer (EIL2), a cathode, a thin film encapsulation layer (TFE), a first planarization layer, a filter layer, and a second planarization layer.
[0149] In the embodiments of this disclosure, the display panel exhibits strongest peaks in the 500nm-540nm and 600nm-650nm wavelength bands, respectively. When driven by a 6.5V voltage, the intensity difference between the strongest peak in the 500nm-540nm band and the strongest peak in the 600nm-650nm band is a first intensity difference value X1. When driven by a 9V voltage, the intensity difference between the strongest peak in the 500nm-540nm band and the strongest peak in the 600nm-650nm band is a second intensity difference value X2. The intensity difference ratio Y = X1 / X2 of the first intensity difference value X1 and the second intensity difference value X2 reflects the spectral stability of the display panel. Experimental verification shows that the intensity difference ratio Y of the display panel in the embodiments of this disclosure is less than 0.7. This indicates that the display panel in the embodiments of this disclosure exhibits smaller spectral fluctuations, achieving higher spectral stability, while also improving the efficiency and lifespan of the display panel.
[0150] The display panel of this disclosure embodiment can be prepared using conventional methods. For example, the various structural layers in the display panel can be prepared by vacuum evaporation. Those skilled in the art can select a suitable preparation method based on the structure of the display panel in this disclosure embodiment, which will not be elaborated further here.
[0151] The following description, based on experimental data, further illustrates the display panel of this application.
[0152] Example 1
[0153] As shown in Figure 1, the display panel of Embodiment 1 includes, in sequence, an anode, a first hole injection layer (HIL1), a first hole transport layer (HTL1), a first electron blocking layer (EBL1), a blue light emitting layer (B-EML), a first hole blocking layer (HBL1), a first electron transport layer (ETL1), an electron charge generation layer (N-CGL), a hole charge generation layer (P-CGL), a second hole transport layer (HTL2), a second electron blocking layer (EBL2), a red light emitting layer (R-EML), a green light emitting layer (G-EML), a second hole blocking layer (HBL2), a second electron transport layer (ETL2), a second electron injection layer (EIL2), a cathode, a thin film encapsulation layer (TFE), a first planarization layer, a filter layer, and a second planarization layer.
[0154] The thickness of the first hole injection layer (HIL1) is... The thickness of the first hole transport layer (HTL1) is The thickness of the first electron blocking layer (EBL1) is The thickness of the blue light-emitting layer (B-EML) is The thickness of the first hole blocking layer (HBL1) is The thickness of the first electron transport layer (ETL1) is The thickness of the electron charge generation layer (N-CGL) is The thickness of the hole charge generation layer (P-CGL) is The thickness of the second hole transport layer (HTL2) is The thickness of the second electron blocking layer (EBL2) is The thickness of the red-emitting layer (R-EML) is The thickness of the green light-emitting layer (G-EML) is The thickness of the second hole blocking layer (HBL2) is The thickness of the second electron transport layer (ETL2) is The thickness of the second electron injection layer (EIL2) is The thickness of the cathode is The first distance is The second distance is The third distance is
[0155] The materials used to prepare the first hole injection layer (HIL1) and the second hole injection layer (HIL1) include the compound shown in Formula A-1:
[0156]
[0157]
[0158] The materials used to prepare the first hole transport layer (HTL1) and the second hole transport layer (HTL2) respectively include the compounds shown in Formula A-2:
[0159]
[0160]
[0161] The materials used to prepare the first electron blocking layer (EBL1) include the compound shown in Formula A-3:
[0162]
[0163]
[0164] The materials used to prepare the blue light-emitting layer (B-EML) include compounds shown in formulas A-4 and A-5:
[0165]
[0166]
[0167] The materials used to prepare the first hole-blocking layer (HBL1) and the second hole-blocking layer (HBL2) respectively include the compounds shown in Formula 3:
[0168]
[0169]
[0170] The materials used to prepare the first electron transport layer (ETL1), the second electron transport layer (ETL2), and the hole charge generation layer (P-CGL) include compounds shown in Formula A-6 and Formula A-7, respectively.
[0171]
[0172]
[0173] The materials used to prepare the electron charge generation layer (N-CGL) include compounds represented by formula A-8:
[0174]
[0175]
[0176] The materials used to prepare the second electron blocking layer (EBL2) include compounds shown in Formula A-9:
[0177]
[0178]
[0179] The materials used to prepare the red-emitting layer (R-EML) include compounds shown in formulas A-11, A-12, and A-12, respectively.
[0180]
[0181]
[0182] The materials used to prepare the green luminescent layer (G-EML) include compounds shown in formulas A-13, A-14, and A-15, respectively:
[0183]
[0184]
[0185] The materials used to prepare the second electron injection layer (EIL2) include Yb.
[0186] The display panel of Example 1 was tested, and the results showed that its strength difference ratio Y was 0.5.
[0187] Examples 2 to 10
[0188] The structural layers and the materials used to prepare each structural layer of the display panel in Examples 2 to 10 are the same as those in Example 1. The differences between the display panels in Examples 2 to 10 and those in Example 1 are shown in Table 1.
[0189] Comparative Examples 1 to 5
[0190] The structural layers and materials used to prepare each structural layer of the display panels in Comparative Examples 1 to 5 are the same as those in Example 1. The differences between the display panels of Comparative Examples 1 to 5 and those of Example 1 are shown in Table 1. The comparative compound is shown in Formula 21.
[0191]
[0192]
[0193] The highest occupied molecular orbital energy level of the comparative compound shown in Formula A-16 is 5.8, and the lowest unoccupied molecular orbital energy level is 2.3.
[0194] Table 1. Differences between the Examples and Comparative Examples and Experimental Results on Spectral Stability
[0195]
[0196] As can be seen from the experimental results in Table 1, the display panels of Embodiments 1 to 10 of this disclosure can all achieve an intensity difference ratio Y of less than 0.7. Therefore, it can be seen that by controlling the first distance, the second distance, the third distance and the material used to prepare the second hole blocking layer, the display panels of the embodiments of this disclosure can improve the charge transport performance of the display panel and reduce the shift of the recombination center to a certain extent. This can result in smaller spectral fluctuations in the display panel, achieving higher spectral stability, and also improving the efficiency and lifespan of the display panel.
[0197] As can be seen from the experimental results in Table 1, the large third distance of the display panel in Comparative Example 1 fails to effectively improve the charge transport performance, resulting in an intensity difference ratio Y of 1.1 and significant spectral fluctuations. In Comparative Example 2, the highest occupied molecular orbital energy level and the lowest unoccupied molecular orbital energy level of the material used in the second hole-blocking layer do not match the display panel, resulting in an intensity difference ratio Y of 0.8, which is also significantly higher than the spectral fluctuation range of the display panel in this embodiment. In Comparative Example 3, the large third distance and the inability of the material used in the second hole-blocking layer to match the display panel result in an intensity difference ratio Y as high as 1.4, significantly higher than the spectral fluctuation range of the display panel in this embodiment. Similarly, the large difference between the second and first distances in the display panel of Comparative Example 4 leads to an intensity difference ratio Y of 0.9, significantly higher than the spectral fluctuation range of the display panel in this embodiment. Because the difference between the second distance and the first distance of the display panel in Comparative Example 5 is large, and the highest occupied molecular orbital energy level and the lowest unoccupied molecular orbital energy level of the material used to prepare the second hole blocking layer cannot match the display panel, its intensity difference ratio Y is as high as 1.7, which is significantly higher than the spectral fluctuation range of the display panel in the present disclosure embodiment. Because the difference between the second distance and the first distance of the display panel in Comparative Example 6 is small, its intensity difference ratio Y is also increased, which is relatively higher than the spectral fluctuation range of the display panel in the present disclosure embodiment. Because the third distance of the display panel in Comparative Example 7 is small, its intensity difference ratio Y is also increased to 0.87, which is significantly higher than the spectral fluctuation range of the display panel in the present disclosure embodiment.
[0198] Based on the same inventive concept, this disclosure provides a display module, which includes the display panel described above.
[0199] Since the display module provided by the present invention includes the display panel of the above-mentioned technical solution, the display module provided by the present invention has all the beneficial effects of the above-mentioned display panel, which will not be elaborated here.
[0200] Based on the same inventive concept, this disclosure provides a display device, which includes the display module described above.
[0201] Since the display device provided by the present invention includes the display module of the above-mentioned technical solution, the display device provided by the present invention has all the beneficial effects of the above-mentioned display module, which will not be elaborated here.
[0202] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0203] Furthermore, the use of terms such as "first" and "second" in this disclosure is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this disclosure, "multiple" means two or more, unless otherwise explicitly specified.
[0204] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this disclosure.
[0205] Although embodiments of the present disclosure have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present disclosure, the scope of which is defined by the claims and their equivalents.
Claims
1. A display panel, comprising a substrate and multiple light-emitting devices of various colors disposed on the substrate according to a preset rule, wherein the light-emitting devices comprise a first electrode layer, a first stacked layer, a charge generating layer, a second stacked layer, and a second electrode layer disposed sequentially. The first stacked layer includes a blue light-emitting layer; The charge generation layer includes a hole charge generation layer and an electron charge generation layer disposed adjacent to each other, with the electron charge generation layer located on the side close to the first stacked layer; The second stacked layer includes a red light-emitting layer and a green light-emitting layer disposed adjacent to each other, wherein the green light-emitting layer is located on the side of the red light-emitting layer closer to the second electrode layer; the second stacked layer further includes a second hole-blocking layer, wherein the second hole-blocking layer is located on the side of the green light-emitting layer closer to the second electrode layer; in, There is a first distance between the side of the red light emitting layer near the green light emitting layer and the side of the hole charge generating layer near the electron charge generating layer, and there is a second distance between the side of the green light emitting layer near the red light emitting layer and the side of the second electrode layer near the green light emitting layer. The first distance is less than the second distance. The highest occupied molecular orbital energy level of the material used to prepare the second hole blocking layer is 6.0 eV to 6.3 eV, and the lowest unoccupied molecular orbital energy level is 2.4 eV to 2.8 eV.
2. The display panel as claimed in claim 1, wherein, The first distance is The second distance is The difference between the second distance and the first distance is less than or equal to 3. The display panel as claimed in claim 1, wherein, There is a third distance between the side of the second hole-blocking layer near the green light-emitting layer and the side of the second electrode layer near the green light-emitting layer, the third distance being...
4. The display panel as claimed in claim 3, wherein, The materials used to prepare the second hole-blocking layer include compounds represented by general formula I. In general formula I, L is selected from the linking groups shown in formulas L1 to L6: In general formula I, R1 and R2 may be the same as or different from each other, and R1 and R2 are each independently selected from hydrogen, deuterium, halogen, cyano, nitro, alkyl with 1 to 40 substituted or unsubstituted carbon atoms, alkenyl with 2 to 40 substituted or unsubstituted carbon atoms, alkynyl with 2 to 40 substituted or unsubstituted carbon atoms, cycloalkyl with 3 to 40 substituted or unsubstituted carbon atoms, heterocycloalkyl with 3 to 40 substituted or unsubstituted carbon atoms, aryl with 6 to 60 substituted or unsubstituted carbon atoms, heteroaryl with 5 to 60 substituted or unsubstituted carbon atoms, alkoxy with 1 to 40 substituted or unsubstituted carbon atoms, aryloxy with 6 to 60 substituted or unsubstituted carbon atoms, alkylsilyl with 3 to 40 substituted or unsubstituted carbon atoms, and arylsilyl with 6 to 60 substituted or unsubstituted carbon atoms. In general formula I, R3 and R4 may be the same as or different from each other, and R3 and R4 are each independently selected from hydrogen, deuterium, halogen, cyano, nitro, substituted or unsubstituted alkyl with 1 to 40 carbon atoms, substituted or unsubstituted alkenyl with 2 to 40 carbon atoms, substituted or unsubstituted ynyl with 2 to 40 carbon atoms, substituted or unsubstituted cycloalkyl with 3 to 40 carbon atoms, substituted or unsubstituted heterocyclic alkyl with 3 to 40 nuclei, substituted or unsubstituted The ring has 6 to 60 aryl carbon atoms, 5 to 60 heteroaryl carbon atoms (substituted or unsubstituted), 1 to 40 alkoxy carbon atoms (substituted or unsubstituted), 6 to 60 aryloxy carbon atoms (substituted or unsubstituted), 3 to 40 alkylsilyl carbon atoms (substituted or unsubstituted), and 6 to 60 arylsilyl carbon atoms (substituted or unsubstituted), wherein R3 and R4 are not fused together or are fused together to form a five-membered or six-membered ring.
5. The display panel as claimed in claim 4, wherein, In general formula I, R1 and R2 may be the same or different from each other, and R1 and R2 are each independently selected from aryl groups with 6 to 18 carbon atoms, whether substituted or unsubstituted. In general formula I, R3 and R4 may be the same or different from each other, and R3 and R4 are each independently selected from hydrogen or deuterium; or, R3 and R4 are each independently selected from alkyl groups having 1 to 6 carbon atoms, whether substituted or unsubstituted, and R3 and R4 are fused together to form a five-membered ring or a six-membered ring.
6. The display panel as claimed in claim 4, wherein, The compound represented by general formula I is represented by any one of the compounds represented by formulas 1 to 20:
7. The display panel as described in any one of claims 3 to 6, wherein, The light-emitting device further includes a thin-film encapsulation layer and a filter layer. The thin-film encapsulation layer is disposed on the side of the second electrode layer away from the second stacked layer, and the filter layer is disposed on the side of the thin-film encapsulation layer away from the second electrode layer. The filter layer includes a red filter layer, a green filter layer, and a blue filter layer. The red filter layer is configured to emit red light, the green filter layer is configured to emit green light, and the blue filter layer is configured to emit blue light.
8. The display panel as claimed in claim 7, wherein, The light-emitting device further includes a planarization layer, which is disposed on the side of the filter layer near the thin film encapsulation layer and / or on the side of the filter layer away from the thin film encapsulation layer.
9. A display module comprising a display panel as described in any one of claims 1 to 8.
10. A display device comprising the display module as described in claim 9.