Display panel, display module and display device

Abstract

The invention discloses a display panel, a display module and a display device, the display panel comprises a substrate and a multi-color light-emitting device arranged on the substrate, and the light-emitting device comprises a first electrode layer, a first stacking layer, a charge generation layer, a second stacking layer and a second electrode layer; the second stacking layer comprises a red light emitting layer and a green light emitting layer which are adjacent to each other, and the green light emitting layer is located on the side, close to the second electrode layer, of the red light emitting layer; wherein a first distance is formed between one side, close to the green light emitting layer, of the red light emitting layer and one side, close to the electron charge generating layer, of the hole charge generating layer, a second distance is formed between one side, close to the red light emitting layer, of the green light emitting layer and one side, close to the green light emitting layer, of the second electrode layer, and the first distance is smaller than the second distance; the highest occupied molecular orbital energy level of the preparation material of the second hole blocking layer is 6.0 eV to 6.3 eV, and the lowest unoccupied molecular orbital energy level of the preparation material of the second hole blocking layer is 2.4 eV to 2.8 eV.

Description

Technical Field

[0001] The present disclosure belongs to the technical field of display devices, and particularly relates to a display panel, a display module, and a display device. Background Art

[0002] In the related art, white organic light emitting diode (WOLED) devices often have the defect of poor spectral stability.

[0003] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present disclosure, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0004] The present disclosure provides a display panel, a display module, and a display device.

[0005] A display panel provided by an embodiment of the present disclosure, the display panel includes a substrate and light emitting devices of multiple colors arranged on the substrate according to a preset rule, and the light emitting devices include a first electrode layer, a first stacked layer, a charge generation layer, a second stacked layer, and a second electrode layer which are sequentially stacked;

[0006] The first stacked layer includes a blue light emitting layer;

[0007] The charge generation layer includes a hole charge generation layer and an electron charge generation layer which are arranged adjacent to each other, and the electron charge generation layer is located on the side close to the first stacked layer;

[0008] The second stacked layer includes a red light emitting layer and a green light emitting layer which are arranged adjacent to each other, and the green light emitting layer is located on the side of the red light emitting layer close to the second electrode layer; the second stacked layer further includes a second hole blocking layer, and the second hole blocking layer is located on the side of the green light emitting layer close to the second electrode layer;

[0009] Wherein, there is a first distance between the side of the red light emitting layer close to the green light emitting layer and the side of the hole charge generation layer close to the electron charge generation layer, and there is a second distance between the side of the green light emitting layer close to the red light emitting layer and the side of the second electrode layer close to the green light emitting layer, and the first distance is less than the second distance; the highest occupied molecular orbital energy level of the material for preparing 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.

[0010] In some embodiments, the first distance is The second distance is The difference between the second distance and the first distance is less than or equal to

[0011] In some embodiments, there is a third distance between the side of the second hole blocking layer close to the green light emitting layer and the side of the second electrode layer close to the green light emitting layer, and the third distance is

[0012] In some embodiments, the material for preparing the second hole blocking layer includes a compound represented by General Formula I,

[0013]

[0014] In General Formula I, L is selected from the groups represented by Formula L 1 to Formula L 6 as shown:

[0015]

[0016] In General Formula I, R 1 and R 2 are the same as or different from each other, and R 1 and R 2 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 alkynyl with 2 to 40 carbon atoms, substituted or unsubstituted cycloalkyl with 3 to 40 carbon atoms, substituted or unsubstituted heterocycloalkyl with 3 to 40 ring atoms, substituted or unsubstituted aryl with 6 to 60 carbon atoms, substituted or unsubstituted heteroaryl with 5 to 60 ring 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;

[0017] In General Formula I, R 3 and R 4 are the same as or different from each other, and R 3 and R 4Each independently selects hydrogen, deuterium, halogen, cyano, nitro, a substituted or unsubstituted alkyl group having 1 to 40 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 40 carbon atoms, a substituted or unsubstituted alkynyl group having 2 to 40 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 40 carbon atoms, a substituted or unsubstituted heterocycloalkyl group having 3 to 40 ring atoms, a substituted or unsubstituted aryl group having 6 to 60 carbon atoms, a substituted or unsubstituted heteroaryl group having 5 to 60 ring atoms, a substituted or unsubstituted alkoxy group having 1 to 40 carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 60 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 40 carbon atoms, and a substituted or unsubstituted arylsilyl group having 6 to 60 carbon atoms, R 3 and R 4 are not fused to each other or R 3 and R 4 are fused to each other to form a five-membered or six-membered ring.

[0018] In some embodiments, in general formula I, R 1 and R 2 are the same as or different from each other, R 1 and R 2 each independently selected from substituted or unsubstituted aryl groups having 6 to 18 carbon atoms;

[0019] In general formula I, R 3 and R 4 are the same as or different from each other, R 3 and R 4 each independently selected from hydrogen, deuterium; or, R 3 and R 4 each independently selected from substituted or unsubstituted alkyl groups having 1 to 6 carbon atoms, and R 3 and R 4 are fused to each other to form a five-membered or six-membered ring.

[0020] In some embodiments, the compound represented by general formula I is represented by any one of the compounds represented by Formula 1 to Formula 20:

[0021]

[0022]

[0023]

[0024] In some embodiments, the light-emitting device further includes a thin-film encapsulation layer and a color filter layer. The thin-film encapsulation layer is disposed on a side of the second electrode layer away from the second stacked layer, and the color filter layer is disposed on a side of the thin-film encapsulation layer away from the second electrode layer. The color filter layer includes a red color filter layer, a green color filter layer, and a blue color filter layer. The red color filter layer is configured to emit red light, the green color filter layer is configured to emit green light, and the blue color filter layer is configured to emit blue light.

[0025] In some embodiments, the light-emitting device further includes a planarization layer. The planarization layer is disposed on a side of the color filter layer close to the thin-film encapsulation layer and / or the planarization layer is disposed on a side of the color filter layer away from the thin-film encapsulation layer.

[0026] A display module provided by an embodiment of the present disclosure includes the above-mentioned display panel.

[0027] A display device provided by an embodiment of the present disclosure includes the above-mentioned display module.

[0028] The embodiments of the present disclosure at least have the following beneficial effects:

[0029] In the above-mentioned display panel, by making the first distance between the side of the red light-emitting layer close to the green light-emitting layer and the side of the hole charge generation layer close to the electron charge generation layer less than the second distance between the side of the green light-emitting layer close to the red light-emitting layer and the side of the second electrode layer close to the green light-emitting layer, the interface position between the green light-emitting layer and the red light-emitting layer can be adjusted to a certain extent. At the same time, by making the energy level of the material for preparing the second hole blocking layer match the first distance and the second distance, the imbalance between holes and electrons can be reduced to a certain extent, so that the offset of the recombination center under different current / voltage driving can be reduced to a certain extent, and the recombination center can be made as close as possible to the interface between the red light-emitting layer and the green light-emitting layer, thereby improving the spectral stability of the display panel, and at the same time improving the efficiency and lifespan of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0031] Figure 1 A schematic structural diagram of the display panel in the embodiment of the present disclosure is shown.

[0032] Reference Numerals:

[0033] 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 manners

[0034] The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Apparently, the described embodiments are only a part rather than all of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present disclosure without creative efforts shall fall within the protection scope of the present disclosure.

[0035] In addition, the present disclosure may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or arrangements discussed. In addition, the present disclosure provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0036] The present disclosure will be described below with reference to the accompanying drawings and specific embodiments:

[0037] Organic Light-Emitting Diode (OLED) devices have achieved an increasingly important position in people's production and life. As a new generation of display technology, OLED devices have the advantages of soft emission, fast response speed, full color saturation, wide viewing angle, etc., and are gradually considered by the industry to be the most ideal display technology with broad application prospects.

[0038] According to the different directions of light emission, OLED devices can be divided into bottom-emission OLED devices and top-emission OLED devices. In bottom-emission OLED devices, since the thin-film transistor part cannot transmit light, the light-emitting area becomes smaller; in top-emission OLED devices, the transparent electrode is on the light-emitting side of the light-emitting layer, and the reflective electrode is on the light-incident side of the light-emitting layer, which can make the light emit from the direction opposite to the substrate. The top-emission OLED device increases the light-transmitting area. Therefore, the more widely studied OLED devices are mainly top-emission.

[0039] A white organic light-emitting diode (WOLED) device realizes different colors by white light passing through a color filter layer, and has the advantage of being easy to achieve top emission.

[0040] In the related art, WOLED devices usually set the red light-emitting layer and the green light-emitting layer in direct contact. However, under different current drives, the recombination center often shifts, resulting in poor spectral stability of the WOLED, and also affecting the efficiency and lifespan of the WOLED.

[0041] The inventors of the present disclosure found through research that in WOLED devices, limited by the materials currently applied to 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. Then, when the green light-emitting layer and the red light-emitting layer are arranged adjacent to each other, it is easy to cause an imbalance between holes and electrons, which will lead to a shift of the recombination center, thereby affecting the efficiency and lifespan of the WOLED device.

[0042] Based on the research findings of the inventors of the present disclosure, the following inventive concept is proposed: by controlling the magnitude of the first distance between the side of the red light-emitting layer close to the green light-emitting layer and the side of the hole charge generation layer close to the electron charge generation layer, and the second distance between the side of the green light-emitting layer close to the red light-emitting layer and the side of the second electrode layer close to the green light-emitting layer, to offset the thickness difference between the green light-emitting layer and the red light-emitting layer to a certain extent, and at the same time, matching the preparation materials of the hole blocking layer with energy levels, so as to balance holes and electrons, thereby achieving the purpose of avoiding the shift of the recombination center, and further improving the efficiency and lifespan of the WOLED device.

[0043] Based on the above inventive concept, a display panel proposed in an embodiment of the present disclosure, as Figure 1 shown, the display panel includes a substrate and light-emitting devices of various colors arranged on the substrate according to a preset rule. The light-emitting devices include a first electrode layer, a first stacked layer, a charge generation layer, a second stacked layer, and a second electrode layer which are sequentially stacked;

[0044] The first stacked layer includes a blue light-emitting layer;

[0045] The charge generation layer includes a hole charge generation layer and an electron charge generation layer which are arranged adjacent to each other, and the electron charge generation layer is located on the side close to the first stacked layer;

[0046] The second stacked layer includes a red light-emitting layer and a green light-emitting layer which are arranged adjacent to each other, and the green light-emitting layer is located on the side of the red light-emitting layer close to the second electrode layer; the second stacked layer further includes a second hole blocking layer, and the second hole blocking layer is located on the side of the green light-emitting layer close to the second electrode layer;

[0047] Wherein, there is a first distance between the side of the red light-emitting layer close to the green light-emitting layer and the side of the hole charge generation layer close to the electron charge generation layer, and there is a second distance between the side of the green light-emitting layer close to the red light-emitting layer and the side of the second electrode layer close to the green light-emitting layer, and the first distance is less than the second distance; the highest occupied molecular orbital energy level of the material for preparing 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.

[0048] For the display panel provided by the embodiment of the present disclosure, by making the first distance between the side of the red light-emitting layer close to the green light-emitting layer and the side of the hole charge generation layer close to the electron charge generation layer less than the second distance between the side of the green light-emitting layer close to the red light-emitting layer and the side of the second electrode layer close to the green light-emitting layer, the interface position between the green light-emitting layer and the red light-emitting layer can be adjusted to a certain extent. At the same time, by making the energy level of the material for preparing the second hole blocking layer match the first distance and the second distance, the imbalance between holes and electrons can be reduced to a certain extent, so that the offset of the recombination center under different current / voltage drives can be reduced to a certain extent, and the recombination center can be made as close as possible to the interface between the red light-emitting layer and the green light-emitting layer, thereby improving the spectral stability of the display panel, and at the same time improving the efficiency and lifespan of the display panel.

[0049] As an optional implementation manner, as Figure 1 shown, the first distance is The second distance is The difference between the second distance and the first distance is less than or equal to

[0050] In some embodiments of the present disclosure, the inventors of the present disclosure found through research that the offset amount of the recombination center is generally less than As Figure 1 shown, by making the first distance be The second distance is The difference between the second distance and the first distance is less than or equal to It can ensure that the first distance is less than the second distance, so as to offset the offset of the recombination center to a certain extent by the difference between the second distance and the first distance, and make the recombination center as close as possible to the interface between the red light emitting layer and the green light emitting layer.

[0051] In some embodiments of the present disclosure, optionally, the difference between the second distance and the first distance is

[0052] In some embodiments of the present disclosure, optionally, the first distance is The second distance is The difference between the second distance and the first distance is

[0053] In some embodiments of the present disclosure, optionally, the first distance can be The second distance can be The difference between the second distance and the first distance can be

[0054] As an alternative embodiment, as Figure 1 shown, there is a third distance between the side of the second hole blocking layer close to the green light emitting layer and the side of the second electrode layer close to the green light emitting layer, and the third distance is

[0055] In some embodiments of the present disclosure, as Figure 1 shown, by making the third distance between the side of the second hole blocking layer close to the green light emitting layer and the side of the second electrode layer close to the green light emitting layer be That is to say, the thickness of the green light emitting layer is Then, the thickness difference between the green light emitting layer and the red light emitting layer can be reduced to a certain extent, and at the same time, the interface position between the green light emitting layer and the red light emitting layer can be adapted to the recombination center.

[0056] As an alternative embodiment, the material for preparing the second hole blocking layer includes the compound shown in General Formula I;

[0057]

[0058] In General Formula I, L is selected from the groups shown in Formula L 1 to Formula L 6 shown:

[0059]

[0060]

[0061] In General Formula I, R 1 and R 2 are the same as or different from each other, R1 and R 2 each independently selected from hydrogen, deuterium, halogen, cyano, nitro, substituted or unsubstituted alkyl having 1 to 40 carbon atoms, substituted or unsubstituted alkenyl having 2 to 40 carbon atoms, substituted or unsubstituted alkynyl having 2 to 40 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 40 carbon atoms, substituted or unsubstituted heterocycloalkyl having 3 to 40 ring atoms, substituted or unsubstituted aryl having 6 to 60 carbon atoms, substituted or unsubstituted heteroaryl having 5 to 60 ring atoms, substituted or unsubstituted alkoxy having 1 to 40 carbon atoms, substituted or unsubstituted aryloxy having 6 to 60 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 40 carbon atoms, and substituted or unsubstituted arylsilyl having 6 to 60 carbon atoms;

[0062] In general formula I, R 3 and R 4 are the same as or different from each other, R 3 and R 4 each independently selected from hydrogen, deuterium, halogen, cyano, nitro, substituted or unsubstituted alkyl having 1 to 40 carbon atoms, substituted or unsubstituted alkenyl having 2 to 40 carbon atoms, substituted or unsubstituted alkynyl having 2 to 40 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 40 carbon atoms, substituted or unsubstituted heterocycloalkyl having 3 to 40 ring atoms, substituted or unsubstituted aryl having 6 to 60 carbon atoms, substituted or unsubstituted heteroaryl having 5 to 60 ring atoms, substituted or unsubstituted alkoxy having 1 to 40 carbon atoms, substituted or unsubstituted aryloxy having 6 to 60 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 40 carbon atoms, and substituted or unsubstituted arylsilyl having 6 to 60 carbon atoms, R 3 and R 4 are not fused to each other or R 3 and R 4 are fused to each other to form a five-membered or six-membered ring.

[0063] In some embodiments of the present disclosure, the compound represented by the above general formula I can be used as a preparation material for the second hole blocking layer, and the highest occupied molecular orbital energy level of the compound represented by the 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, which can make the energy level of the second hole blocking layer in the display panel match the imbalance degree of holes and electrons and the thickness difference between the green light emitting layer phase and the red light emitting layer, so as to adjust the position of the recombination center, and can make the recombination center located closer to the interface between the green light emitting layer phase and the red light emitting layer, that is to say, the offset of the recombination center can be reduced to a certain extent, thereby improving the spectral stability of the display panel, and at the same time, the efficiency and lifetime of the display panel can also be improved.

[0064] As an alternative embodiment, in General Formula I, R 1 and R 2 are the same as or different from each other, R 1 and R 2 each independently selected from substituted or unsubstituted aryl groups having 6 to 18 carbon atoms; in General Formula I, R 3 and R 4 are the same as or different from each other, R 3 and R 4 each independently selected from hydrogen, deuterium; or, R 3 and R 4 each independently selected from substituted or unsubstituted alkyl groups having 1 to 6 carbon atoms, and R 3 and R 4 are fused to each other to form a five-membered or six-membered ring.

[0065] In some embodiments of the present disclosure, when the compound represented by the above General Formula I is used as the preparation material for the second hole blocking layer, it can meet the requirement that the highest occupied molecular orbital energy level reaches above 6.0 eV, can effectively block holes, and thus provide higher luminous efficiency, improve the stability of the display panel, and thus can improve the efficiency and lifespan of the display panel.

[0066] As an alternative embodiment, the compound represented by General Formula I is represented by any one of the compounds represented by Formula 1 to Formula 20:

[0067]

[0068]

[0069]

[0070] In some embodiments of the present disclosure, the compounds represented by Formula 1 to Formula 20 can meet the requirement that the highest occupied molecular orbital energy level reaches above 6.0 eV, can effectively block holes, and thus provide higher luminous efficiency, improve the stability of the display panel, and thus can improve the efficiency and lifespan of the display panel.

[0071] In some embodiments of the present disclosure, the compounds represented by Formula 1 to Formula 20 can be prepared by the preparation methods known in the art. Exemplarily, the preparation method of the compound represented by Formula 5 of the present disclosure includes the following steps:

[0072] <Step 1> Synthesis of 2'-bromospiro[cyclohexane-1,9'-fluorene]

[0073]

[0074] 2-Bromo-9H-fluorene (100 g, 407.96 mmol) was placed in a 2 L reactor, 500 mL of THF was added, and the mixture was stirred. It was then placed in an ice bath and the internal temperature was set to -0 °C. After adding KOtBu (93.8 g, 1019 mmol) in portions over 15 minutes, the mixture was stirred for 10 minutes. 1,5-Dibromopentane (42.7 g, 407.93 mmol) was added dropwise over 5 minutes. The temperature was slowly raised to room temperature and the mixture was stirred for 8 hours. After the reaction was completed, the mixture was extracted with dichloromethane and MgSO 4 was added and filtered. After removing the solvent from the filtered organic layer, the target compound 2'-bromospiro[cyclohexane-1,9'-fluorene] (78.2 g, yield 61%) was obtained by column chromatography.

[0075] 1 H-NMR: δ 1.58 (m, 2H) 1.77 (m, 8H), 7.33 (m, 2H), 7.55 (d, 1H), 7.74 (d, 1H), 7.85 (m, 3H)

[0076] <Step 2> Synthesis of Nucleus 1

[0077]

[0078] 2'-Bromospiro[cyclohexane-1,9'-fluorene] (78.2.2 g, 249.6 mmol), 4,4,4',4',5,5,5',5'-octamethyl-2,2'-bi(1,3,2-dioxaborolane) (76 g, 299.5 mmol), Pd(dppf)Cl 2 (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 completed, the mixture was extracted with dichloromethane and MgSO4 was added and filtered. After removing the solvent from the filtered organic layer, the target compound Nucleus 1 (70.2 g, yield 78%) was obtained by column chromatography.

[0079] 1 H-NMR: δ 1.57 (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)

[0080] <Step 3>Synthesis of the compound shown in Formula 5

[0081]

[0082] Add 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), Cs 2 CO 3 (9.4 g, 29.1 mmol), and Xphos (0.69 g, 1.45 mmol) into 100 ml of toluene, 25 ml of EtOH, and 25 ml of H 2 O. Heat under reflux for 12 hours. After the reaction is completed, extract with dichloromethane and add MgSO 4 Filter. After removing the solvent of the filtered organic layer, obtain the target compound shown in Formula 5 (5.3 g, yield 67%) by column chromatography.

[0083] As an alternative embodiment, 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 close to the second hole blocking layer, the second electron transport layer is located on the side of the second electron injection layer close to the second hole blocking layer, the second electron blocking layer is located on the side of the red light emitting layer close to the hole charge generation layer, and the second hole transport layer is located on the side of the second electron blocking layer close to the hole charge generation layer.

[0084] In some embodiments of the present disclosure, the display panel may, according to design requirements, make the second stacked layer further include 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.

[0085] As an alternative embodiment, the first stacked layer further includes any one or more of 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 close to the blue light emitting layer, the first hole transport layer is located on the side of the first hole injection layer close to the blue light emitting layer, the first electron blocking layer is located on the side of the first hole transport layer close to the blue light emitting layer, the first hole blocking layer is located on the side of the blue light emitting layer close to the electron charge generation layer, and the first electron transport layer is located on the side of the first hole blocking layer close to the electron charge generation layer.

[0086] In some embodiments of the present disclosure, according to design requirements, the first stacking layer may further include any one or more of 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.

[0087] In some embodiments of the present disclosure, the substrate may be selected from any transparent rigid or flexible substrate material. For example, the substrate may be glass or polyimide.

[0088] In some embodiments of the present disclosure, the first electrode layer may be an anode, and the material for preparing the anode is selected from electrode materials with a high work function. Optionally, the material for preparing the anode may be a metal material, such as an alloy composed of any one or several of copper (Cu), gold (Au), silver (Ag), iron (Fe), chromium (Cr), nickel (Ni), palladium (Pd), and platinum (Pt); the material for preparing the anode may also be a metal oxide, such as any one or several of indium oxide (In 2 O3), zinc oxide (ZnO), indium tin oxide (ITO), and indium zinc oxide (IZO). The material for preparing the anode may also be a self-conductive polymer, such as any one or several of polyaniline, polypyrrole, poly(3-methylthiophene), carbon nanotubes (CNT), and graphene oxide (GO). The material for preparing the anode may also be a composite electrode formed by 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 material for preparing the anode may also be a material that helps hole injection and its combination, including known materials suitable for making an anode.

[0089] In some embodiments of the present disclosure, the second electrode layer may be a cathode. The material for preparing the cathode may be selected from electrode materials with a low work function, so as to easily inject electrons into the organic layer between the first electrode layer and the second electrode layer. Optionally, the second electrode layer may have both good light transmittance and conductivity. Optionally, the material for preparing the cathode may be a metal material, a metal oxide or a metal alloy, such as any one of 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), ytterbium silver alloy (Yb:Ag), lithium aluminum alloy (Li:Al), and lithium calcium magnesium alloy (Li:Ca:Al); the material for preparing the cathode may also be a laminated structure composed of a metal and a metal compound material, 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 material for preparing the cathode may also be a material that helps electron injection and its combination, including known materials suitable for making cathodes.

[0090] In some embodiments of the present disclosure, the material for preparing the first hole injection layer may be an inorganic oxide, such as any one or several 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 may be a dopant with a strong electron-withdrawing system, such as F4TCNQ and HATCN; the material for preparing the first hole injection layer may also be P-type doped with a p-dopant, and the first hole injection layer is formed by co-evaporation.

[0091] In some embodiments of the present disclosure, the materials for preparing the first hole transport layer and the second hole transport layer may be the same or different. Optionally, the materials for preparing the first hole transport layer and the second hole transport layer may each independently be selected from arylamine or carbazole materials having 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-phenylfluoren-9-yl)triphenylamine (BAFLP), 4,4'-bis[N-(9,9-dimethylfluoren-2-yl)-N-phenylamino]biphenyl (DFLDPBi), 4,4'-bis(9-carbazolyl)biphenyl (CBP), and 9-phenyl-3-[4-(10-phenyl-9-anthryl)phenyl]-9H-carbazole (PCzPA) may be used, etc.

[0092] In some embodiments of the present disclosure, the materials for preparing 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 may each independently be selected from arylamine or carbazole materials having 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-phenylfluoren-9-yl)triphenylamine (BAFLP), 4,4'-bis[N-(9,9-dimethylfluoren-2-yl)-N-phenylamino]biphenyl (DFLDPBi), 4,4'-bis(9-carbazolyl)biphenyl (CBP), and 9-phenyl-3-[4-(10-phenyl-9-anthryl)phenyl]-9H-carbazole (PCzPA) may be used, etc.

[0093] In some embodiments of the present disclosure, the material for preparing the first hole blocking layer may be the same as the material for preparing the second hole blocking layer. The material for preparing the first hole blocking layer may also be different from the material for preparing the second hole blocking layer. For example, the material for preparing the first hole blocking layer may be a heterocyclic aromatic compound, such as imidazole derivatives including benzimidazole derivatives, imidazopyridine derivatives, and benzimidazophenanthridine derivatives; the material for preparing the first hole blocking layer may be oxazine derivatives such as pyrimidine derivatives and triazine derivatives; the material for preparing the first hole blocking layer may also be compounds containing a nitrogen six-membered ring structure such as quinoline derivatives, isoquinoline derivatives, and phenanthroline derivatives, among which, compounds having a phosphine oxide-based substituent on the heterocycle are also included; 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD), 1,3-bis[5-(p-tert-butylphenyl)-1,3,4-oxadiazol-2-yl]benzene (OXD-7), 3-(4-tert-butylphenyl)-4-phenyl-5-(4-biphenylyl)-1,2,4-triazole (TAZ), 3-(4-tert-butylphenyl)-4-(4-ethylphenyl)-5-(4-biphenylyl)-1,2,4-triazole (p-EtTAZ), bathocuproine (BPhen), bathocuproin (BCP), 4,4'-bis(5-methylbenzoxazol-2-yl)stilbene (BzOs), and 1,3,4-diazole may also be used.

[0094] In some embodiments of the present disclosure, the materials for preparing the first electron transport layer and the second electron transport layer may be the same or different, and the materials for preparing the first electron transport layer and the second electron transport layer may be selected from materials having good electron transport characteristics. Optionally, the materials for preparing the first electron transport layer and the second electron transport layer may each independently be selected from heterocyclic aromatic compounds, such as imidazole derivatives including benzimidazole derivatives, imidazopyridine derivatives, and benzimidazophenanthridine derivatives; the materials for preparing the first electron transport layer and the second electron transport layer may each independently be selected from pyrazine derivatives such as pyrimidine derivatives and triazine derivatives; the materials for preparing the first electron transport layer and the second electron transport layer may each independently be selected from compounds containing a nitrogen six-membered ring structure such as quinoline derivatives, isoquinoline derivatives, and phenanthroline derivatives, including compounds having a phosphine oxide-based substituent on the heterocycle; the materials for preparing the first electron transport layer and the second electron transport layer may each independently be selected from 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD), 1,3-bis[5-(p-tert-butylphenyl)-1,3,4-oxadiazol-2-yl]benzene (OXD-7), 3-(4-tert-butylphenyl)-4-phenyl-5-(4-biphenylyl)-1,2,4-triazole (TAZ), 3-(4-tert-butylphenyl)-4-(4-ethylphenyl)-5-(4-biphenylyl)-1,2,4-triazole (p-EtTAZ), bathophenanthroline (BPhen), bathocuproine (BCP), 4,4'-bis(5-methylbenzoxazol-2-yl)stilbene (BzOs), and 1,3,4-diazole, etc.

[0095] In some embodiments of the present disclosure, the material for preparing the second electron injection layer is selected from materials having the ability to transport electrons, and at the same time, it is also required to have the effect of injecting electrons from the cathode and excellent thin film forming properties. The material for preparing the second electron injection layer may be any one or more of alkali metal materials, metal materials, alkali metal compounds, and metal compounds. For example, any one or more of lithium fluoride (LiF), ytterbium (Yb), magnesium (Mg), and calcium (Ca).

[0096] In some embodiments of the present disclosure, the blue light emitting layer, the red light emitting layer, and the green light emitting layer all belong to the light emitting layer, and the materials for preparing the light emitting layer may be a phosphorescent host material and a phosphorescent guest material; it may also be a fluorescent host material and a fluorescent guest material. It should be noted that the phosphorescent host material may include one material or two or more materials; the fluorescent host material may include one material or two or more materials.

[0097] In some embodiments of the present disclosure, the host material of the blue light emitting layer may be selected from anthracene derivatives such as ADN and MADN; the guest material of the blue light emitting layer may be selected from pyrene derivatives, fluorene derivatives, perylene derivatives, styrylamine derivatives, and metal complexes, such as TBPe, BDAVBi, DPAVBi, and FIrpic.

[0098] In some embodiments of the present disclosure, the host material of the red light emitting layer may be selected from DCM series materials such as DCM, DCJTB, and DCJTI; the guest material of the red light emitting layer may be a metal complex, such as Ir(piq)2(acac), PtOEP, and Ir(btp)2(acac).

[0099] In some embodiments of the present disclosure, the host material of the green light emitting layer may be selected from, for example, coumarin dyes, quinacridone derivatives, polycyclic aromatic hydrocarbons, diaminoanthracene derivatives, and carbazole derivatives, such as DMQA, BA-NPB, and Alq3; the guest material of the green light emitting layer may be a metal complex, such as Ir(ppy)3 and Ir(ppy)2(acac).

[0100] As an alternative embodiment, optionally, a first light emitting auxiliary layer is provided on one side of the blue light emitting layer close to the first hole transport layer, and / or a second light emitting auxiliary layer is provided on one side of the red light emitting layer close to the second hole transport layer, and / or a third light emitting auxiliary layer is provided on one side of the green light emitting layer close to the second hole transport layer.

[0101] In some embodiments of the present disclosure, the first light emitting auxiliary layer has good hole transport performance and can form a multi-layer hole transport layer structure with the first hole transport layer. The first light emitting auxiliary layer is mainly used to assist the first hole transport layer, enabling the holes transferred from the anode to move smoothly to the blue light emitting layer, and can block the electrons transferred from the cathode to confine the electrons within the blue light emitting layer, reducing the potential barrier between the first hole transport layer and the blue light emitting layer, which can, to a certain extent, reduce the driving voltage of the display panel, improve the utilization rate of holes, and thus improve the efficiency and lifespan of the display panel. The functions of the second light emitting auxiliary layer and the third light emitting auxiliary layer are the same as those of the first light emitting auxiliary layer and will not be elaborated herein. The preparation materials of the first light emitting auxiliary layer, the second light emitting auxiliary layer, and the third light emitting auxiliary layer may each independently be selected from arylamine-based or carbazole-based materials, such as CBP and PCzPA.

[0102] As an alternative embodiment, the light-emitting device further includes a thin-film encapsulation layer and a color filter layer. The thin-film encapsulation layer is disposed on a side of the second electrode layer away from the second stacked layer, and the color filter layer is disposed on a side of the thin-film encapsulation layer away from the second electrode layer. The color filter layer includes a red color filter layer, a green color filter layer, and a blue color filter layer. The red color filter layer is configured to emit red light, the green color filter layer is configured to emit green light, and the blue color filter layer is configured to emit blue light.

[0103] In some embodiments of the present disclosure, the thin-film encapsulation layer covers a 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.

[0104] In some embodiments of the present disclosure, the light-emitting devices of multiple colors in the display panel may include blue light-emitting devices, red light-emitting devices, and green light-emitting devices. Correspondingly, the color filter layer includes a red color filter layer, a green color filter layer, and a blue color filter layer. The red color filter layer is configured to emit red light, the green color filter layer is configured to emit green light, and the blue color filter layer is configured to emit blue light. Then, the cooperation of the red light-emitting device and the red color filter layer can cause the display panel to emit red light, the cooperation of the green light-emitting device and the green color filter layer can cause the display panel to emit green light, and the cooperation of the blue light-emitting device and the blue color filter layer can cause the display panel to emit blue light.

[0105] As an alternative embodiment, the light-emitting device further includes a planarization layer. The planarization layer is disposed on a side of the color filter layer close to the thin-film encapsulation layer and / or the planarization layer is disposed on a side of the color filter layer away from the thin-film encapsulation layer.

[0106] In some embodiments of the present disclosure, by disposing the planarization layer on a side of the color filter layer close to the thin-film encapsulation layer and / or on a side of the color 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 is convenient for the subsequent setting of the structural layer; on the other hand, the planarization layer can reduce the internal stress concentration, making the display panel more uniform and stable.

[0107] In some embodiments of the present disclosure, such as Figure 1As shown, the display panel includes an anode (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 (Cathode), a thin film encapsulation layer (TFE), a first planarization layer, a filter layer, and a second planarization layer, which are stacked in sequence.

[0108] In an embodiment of the present disclosure, the display panel has the strongest peaks in the wavelength bands of 500 nm to 540 nm and 600 nm to 650 nm, respectively. When driven at a voltage of 6.5 V, the intensity difference between the strongest peak in the 500 nm to 540 nm wavelength band and the strongest peak in the 600 nm to 650 nm wavelength band of the display panel is the first intensity difference X1. When driven at a voltage of 9 V, the intensity difference between the strongest peak in the 500 nm to 540 nm wavelength band and the strongest peak in the 600 nm to 650 nm wavelength band of the display panel is the second intensity difference X2. Then, the intensity difference ratio Y = X1 / X2 of the first intensity difference X1 and the second intensity difference X2 can reflect the spectral stability of the display panel. Through experimental verification, the intensity difference ratio Y of the display panel in the embodiment of the present disclosure is less than 0.7. It can be seen that the spectral fluctuation of the display panel in the embodiment of the present disclosure is small, and high spectral stability can be achieved. At the same time, the efficiency and lifespan of the display panel can also be improved.

[0109] The display panel in the embodiment of the present disclosure can be prepared by conventional methods. For example, each structural layer in the display panel can be prepared by vacuum evaporation. Those skilled in the art can select a suitable preparation method according to the structure of the display panel in the embodiment of the present disclosure, which will not be elaborated here.

[0110] The following further illustrates the display panel of the present application in combination with experimental data.

[0111] Example 1

[0112] As Figure 1As shown, the display panel of Embodiment 1 includes an anode (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 (Cathode), a thin film encapsulation layer (TFE), a first planarization layer, a filter layer, and a second planarization layer, which are stacked in sequence.

[0113] Among them, 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 light 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 (Cathode) is The first distance is The second distance is The third distance is

[0114] Among them, the preparation materials of the first hole injection layer (HIL1) and the second hole injection layer (HIL1) include the compound shown in Formula A-1:

[0115]

[0116] The materials for preparing the first hole transport layer (HTL1) and the second hole transport layer (HTL2) respectively include the compound shown in Formula A-2:

[0117]

[0118] The material for preparing the first electron blocking layer (EBL1) includes the compound shown in Formula A-3:

[0119]

[0120] The materials for preparing the blue light emitting layer (B-EML) include the compounds shown in Formula A-4 and Formula A-5:

[0121]

[0122] The materials for preparing the first hole blocking layer (HBL1) and the second hole blocking layer (HBL2) respectively include the compound shown in Formula 3:

[0123]

[0124] The materials for preparing the first electron transport layer (ETL1), the second electron transport layer (ETL2) and the hole charge generation layer (P-CGL) respectively include the compounds shown in Formula A-6 and Formula A-7:

[0125]

[0126] The materials for preparing the electron charge generation layer (N-CGL) respectively include the compound shown in Formula A-8:

[0127]

[0128]

[0129] The materials for preparing the second electron blocking layer (EBL2) respectively include the compound shown in Formula A-9:

[0130]

[0131] The materials for preparing the red light emitting layer (R-EML) respectively include the compounds shown in Formula A-11, Formula A-11 and Formula A-12:

[0132]

[0133] The materials for preparing the green light emitting layer (G-EML) respectively include the compounds shown in Formula A-13, Formula A-14 and Formula A-15:

[0134]

[0135] The preparation material of the second electron injection layer (EIL2) includes Yb.

[0136] The display panel of Example 1 was tested, and the result showed that the intensity difference ratio Y was 0.5.

[0137] Examples 2 to 10

[0138] The structural layers of the display panels of Examples 2 to 10 and the preparation materials of each structural layer are the same as those of Example 1. The differences between the display panels of Examples 2 to 10 and Example 1 are shown in Table 1.

[0139] Comparative Examples 1 to 5

[0140] The structural layers of the display panels of Comparative Examples 1 to 5 and the preparation materials of each structural layer are the same as those of Example 1. The differences between the display panels of Comparative Examples 1 to 5 and Example 1 are shown in Table 1. Among them, the comparative compounds are as

[0141] shown in Formula 21:

[0142]

[0143] 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.

[0144] Table 1 Differences between Examples and Comparative Examples and Experimental Results of Spectral Stability

[0145]

[0146]

[0147] It can be seen from the experimental results in Table 1 that for the display panels of Examples 1 to 10 of the present disclosure, the intensity difference ratio Y can be made less than 0.7. Thus, it can be known that for the display panels of the examples of the present disclosure, by controlling the first distance, the second distance, the third distance, and the preparation material of the second hole blocking layer, the charge transport performance of the display panel can be improved, and to a certain extent, the shift of the recombination center can be reduced, the spectral fluctuation of the display panel can be made smaller, high spectral stability can be achieved, and at the same time, the efficiency and lifespan of the display panel can be improved.

[0148] As can be seen from the experimental results in Table 1, since the third distance of the display panel in Comparative Example 1 is relatively large, the charge transport performance of the display panel cannot be effectively improved, resulting in an intensity difference ratio Y of 1.1 and a relatively large spectral fluctuation of the display panel. Since the highest occupied molecular orbital energy level and the lowest unoccupied molecular orbital energy level of the material for preparing the second hole blocking layer of the display panel in Comparative Example 2 do not match the display panel, the intensity difference ratio Y is 0.8, which is also significantly higher than the spectral fluctuation range of the display panel of the embodiment of the present disclosure. Since the third distance of the display panel in Comparative Example 3 is relatively large, and the highest occupied molecular orbital energy level and the lowest unoccupied molecular orbital energy level of the material for preparing the second hole blocking layer do not match the display panel, the intensity difference ratio Y is as high as 1.4, which is significantly higher than the spectral fluctuation range of the display panel of the embodiment of the present disclosure. Since the difference between the second distance and the first distance of the display panel in Comparative Example 4 is relatively large, the intensity difference ratio Y is also increased to 0.9, which is significantly higher than the spectral fluctuation range of the display panel of the embodiment of the present disclosure. Since the difference between the second distance and the first distance of the display panel in Comparative Example 5 is relatively large, and at the same time, the highest occupied molecular orbital energy level and the lowest unoccupied molecular orbital energy level of the material for preparing the second hole blocking layer do not match the display panel, the intensity difference ratio Y is as high as 1.7, which is significantly higher than the spectral fluctuation range of the display panel of the embodiment of the present disclosure. Since the difference between the second distance and the first distance of the display panel in Comparative Example 6 is relatively small, the intensity difference ratio Y is also increased, which is relatively higher than the spectral fluctuation range of the display panel of the embodiment of the present disclosure. Since the third distance of the display panel in Comparative Example 7 is relatively small, the intensity difference ratio Y is also increased to 0.87, which is significantly higher than the spectral fluctuation range of the display panel of the embodiment of the present disclosure.

[0149] Based on the same inventive concept, an embodiment of the present disclosure provides a display module, and the display module includes the above-mentioned display panel.

[0150] Since the display module provided by the present invention includes the display panel of the above technical solution, the display module provided by the present invention has all the beneficial effects of the above display panel, which will not be elaborated herein.

[0151] Based on the same inventive concept, an embodiment of the present disclosure provides a display device, and the display device includes the above-mentioned display module.

[0152] Since the display device provided by the present invention includes the display module of the above technical solution, the display device provided by the present invention has all the beneficial effects of the above display module, which will not be elaborated herein.

[0153] In this disclosure, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and diagonally above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and diagonally below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0154] In addition, in this disclosure, descriptions such as "first", "second", etc. are for descriptive purposes only, and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second" may explicitly or implicitly include one or more of the said features. In the description of this disclosure, "a plurality of" means two or more, unless otherwise clearly and specifically defined.

[0155] In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this disclosure.

[0156] Although the embodiments of this disclosure have been shown and described, those of ordinary skill in the art can understand that: various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and purposes of this disclosure, and the scope of this disclosure is defined by the claims and their equivalents.

Claims

1. A display panel, characterized in that: The display panel includes a substrate and light-emitting devices of multiple colors arranged on the substrate according to a preset rule, wherein the light-emitting devices include a first electrode layer, a first stacked layer, a charge generation layer, a second stacked layer and a second electrode layer stacked in sequence; 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 which are arranged adjacent to each other, and the electron charge generation layer is located on a side close to the first stacked layer; The second stacked layer includes a red light emitting layer and a green light emitting layer which are arranged adjacent to each other, and the green light emitting layer is located on a side of the red light emitting layer close to the second electrode layer; the second stacked layer also includes a second hole blocking layer, and the second hole blocking layer is located on a side of the green light emitting layer close to the second electrode layer; Among them, there is a first distance between the side of the red light emitting layer close to the green light emitting layer and the side of the hole charge generating layer close to the electron charge generating layer, and there is a second distance between the side of the green light emitting layer close to the red light emitting layer and the side of the second electrode layer close to the green light emitting layer, and the first distance is smaller than the second distance; the highest occupied molecular orbital energy level of the preparation material of the second hole blocking layer is 6.0eV~6.3eV, and the lowest unoccupied molecular orbital energy level is 2.4eV~2.8eV.

2. The display panel according to 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 according to claim 1, wherein: There is a third distance between the side of the second hole blocking layer close to the green light emitting layer and the side of the second electrode layer close to the green light emitting layer, and the third distance is 4. The display panel according to claim 3, wherein: The preparation material of the second hole blocking layer includes a compound shown in general formula I, In the general formula I, L is selected from the linking groups shown in formula L1 to formula L6: In the general formula I, R1 and R2 are the same as or different from each other, and R1 and R2 are each independently selected from hydrogen, deuterium, halogen, cyano, nitro, substituted or unsubstituted alkyl having 1 to 40 carbon atoms, substituted or unsubstituted alkenyl having 2 to 40 carbon atoms, substituted or unsubstituted alkynyl having 2 to 40 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 40 carbon atoms, substituted or unsubstituted heterocycloalkyl having 3 to 40 atomic nuclei, substituted or unsubstituted aryl having 6 to 60 carbon atoms, substituted or unsubstituted heteroaryl having 5 to 60 atomic nuclei, substituted or unsubstituted alkoxy having 1 to 40 carbon atoms, substituted or unsubstituted aryloxy having 6 to 60 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 40 carbon atoms, and substituted or unsubstituted arylsilyl having 6 to 60 carbon atoms; In the general formula I, R3 and R4 are the same or different from each other, and R3 and R4 are each independently selected from hydrogen, deuterium, halogen, cyano, nitro, substituted or unsubstituted alkyl having 1 to 40 carbon atoms, substituted or unsubstituted alkenyl having 2 to 40 carbon atoms, substituted or unsubstituted alkynyl having 2 to 40 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 40 carbon atoms, substituted or unsubstituted heterocycloalkyl having 3 to 40 atomic nuclei, substituted or unsubstituted An aryl group having 6 to 60 carbon atoms, a substituted or unsubstituted heteroaryl group having 5 to 60 atomic nuclei, a substituted or unsubstituted alkoxy group having 1 to 40 carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 60 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 40 carbon atoms, and a substituted or unsubstituted arylsilyl group having 6 to 60 carbon atoms, R3 and R4 are not fused to each other or R3 and R4 are fused to each other to form a five-membered ring or a six-membered ring.

5. The display panel according to claim 4, wherein: In the general formula I, R1 and R2 are the same or different from each other, and R1 and R2 are each independently selected from a substituted or unsubstituted aromatic group having 6 to 18 carbon atoms; In the general formula I, R3 and R4 are the same or different from each other, and R3 and R4 are each independently selected from hydrogen and deuterium; or, R3 and R4 are each independently selected from a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, and R3 and R4 are fused to form a five-membered ring or a six-membered ring.

6. The display panel according to claim 4, wherein: The compound represented by the general formula I is represented by any one of the compounds represented by formula 1 to formula 20:

7. The display panel according to any one of claims 3 to 6, characterized in that: The light-emitting device also includes a thin-film encapsulation layer and a filter layer, the thin-film encapsulation layer is arranged on a side of the second electrode layer away from the second stacked layer, and the filter layer is arranged on a 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 according to claim 7, wherein: The light emitting device further comprises a planarization layer, wherein the planarization layer is arranged on a side of the filter layer close to the thin film encapsulation layer and / or the planarization layer is arranged on a side of the filter layer far from the thin film encapsulation layer.

9. A display module, characterized in that: The display module comprises the display panel as described in any one of claims 1 to 8.

10. A display device, characterized in that: The display device comprises the display module as claimed in claim 9.

Images