A display panel, a display module and a display device

Abstract

Disclosed are a display panel, a display module and a display device. The display panel comprises a substrate and light-emitting devices of multiple colors arranged on the substrate. The light-emitting device comprises a first electrode layer, a first stack layer, a charge generation layer, a second stack layer and a second electrode layer. The second stack layer comprises a red light-emitting layer and a green light-emitting layer 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 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 have a first distance, and 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 have a second distance. 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-6.3 eV, and the lowest unoccupied molecular orbital energy level is 2.4 eV-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

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

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

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

[0005] The display panel provided by the present disclosure comprises a substrate and a plurality of color light emitting devices arranged on the substrate according to a preset rule, wherein the light emitting device comprises a first electrode layer, a first stack layer, a charge generation layer, a second stack layer and a second electrode layer arranged in sequence.

[0006] The first stack layer comprises a blue light emitting layer.

[0007] The charge generation layer comprises a hole charge generation layer and an electron charge generation layer arranged adjacent to each other, and the electron charge generation layer is located on the side close to the first stack layer.

[0008] The second stack layer comprises a red light emitting layer and a green light emitting layer 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 stack layer further comprises 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] 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 is 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; and the highest occupied molecular orbital energy level of the material for preparing the second hole blocking layer is 6.0 eV-6.3 eV, and the lowest unoccupied molecular orbital energy level is 2.4 eV-2.8 eV.

[0010] In some embodiments, the first distance is 430 Å ~ 480 Å, the second distance is 730 Å ~ 790 Å, and the difference between the second distance and the first distance is less than or equal to 300 Å.

[0011] In some embodiments, the second hole-blocking layer has 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 440 Å ~ 470 Å.

[0012] In some embodiments, the preparation material of the second hole-blocking layer comprises a compound represented by general formula I,

[0013]

[0014] General formula I

[0015] In general formula I, L is selected from groups represented by formula L1 to formula L6:

[0016]

[0017] L1 L2

[0018]

[0019] L3 L4

[0020]

[0021] L5 L6

[0022] In 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 a carbon atom number of 1 to 40, substituted or unsubstituted alkenyl having a carbon atom number of 2 to 40, substituted or unsubstituted alkynyl having a carbon atom number of 2 to 40, substituted or unsubstituted cycloalkyl having a carbon atom number of 3 to 40, substituted or unsubstituted heterocycloalkyl having an atom number of 3 to 40, substituted or unsubstituted aryl having a carbon atom number of 6 to 60, substituted or unsubstituted heteroaryl having an atom number of 5 to 60, substituted or unsubstituted alkoxy having a carbon atom number of 1 to 40, substituted or unsubstituted aryloxy having a carbon atom number of 6 to 60, substituted or unsubstituted alkylsilyl having a carbon atom number of 3 to 40, and substituted or unsubstituted arylsilyl having a carbon atom number of 6 to 60;

[0023] In General Formula I, R3and R4are the same as or different from each other, and each of R3and R4is independently selected from the group consisting of 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 atomic nuclei, a substituted or unsubstituted 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, and R3and R4are not fused with each other or R3and R4are fused with each other to form a five-membered ring or a six-membered ring.

[0024] In some embodiments, in General Formula I, R1and R2are the same as or different from each other, and each of R1and R2is independently selected from a substituted or unsubstituted aryl group having 6 to 18 carbon atoms.

[0025] In General Formula I, R3and R4are the same as or different from each other, and each of R3and R4is independently selected from the group consisting of hydrogen, deuterium; or, each of R3and R4is independently selected from a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, and R3and R4are fused with each other to form a five-membered ring or a six-membered ring.

[0026] In some embodiments, the compound represented by General Formula I is represented by any one of compounds represented by Formulae 1 to 20:

[0027]

[0028] Formula 1 Formula 2

[0029]

[0030] Formula 3 Formula 4

[0031]

[0032] Formula 5 Formula 6

[0033]

[0034] Formula 7 Formula 8

[0035]

[0036] Formula 9 Formula 10

[0037]

[0038] Formula 11 Formula 12

[0039]

[0040] Formula 13 Formula 14

[0041]

[0042] Formula 15 Formula 16

[0043]

[0044] Formula 17 Formula 18

[0045]

[0046] Formula 19 Formula 20.

[0047] In some embodiments, the light emitting device further comprises a thin film encapsulation layer disposed on a side of the second electrode layer away from the second stack layer, and a filter layer disposed on a side of the thin film encapsulation layer away from the second electrode layer; the filter layer comprises 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.

[0048] In some embodiments, the light emitting device further comprises a planarization layer disposed on a side of the filter layer close to the thin film encapsulation layer and / or a planarization layer disposed on a side of the filter layer away from the thin film encapsulation layer.

[0049] The display module provided by the embodiments of the present disclosure includes the display panel described above.

[0050] The display device provided by the embodiments of the present disclosure includes the display module described above.

[0051] The embodiments of the present disclosure have at least the following beneficial effects:

[0052] The display panel can adjust the interface position between the green light emitting layer and the red light emitting layer to a certain extent 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 smaller 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, and can reduce the imbalance between the holes and the electrons to a certain extent by matching the energy level of the preparation material of the second hole blocking layer with the first distance and the second distance, thereby reducing the offset of the recombination center under different current / voltage driving to a certain extent, making the recombination center as close as possible to the interface between the red light emitting layer and the green light emitting layer, and improving the spectral stability of the display panel, and also improving the efficiency and the service life of the display panel. BRIEF DESCRIPTION OF DRAWINGS

[0053] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed in the embodiments will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present disclosure, and other drawings can also be obtained by those skilled in the art without creative labor.

[0054] Figure 1 The structure schematic diagram of the display panel in the embodiments of the present disclosure is shown.

[0055] Reference signs:

[0056] 100, first electrode layer; 200, first stack 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 stack 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 DESCRIPTION

[0057] With reference to the drawings and specific examples described below, the technical solutions in the embodiments of the present disclosure will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present disclosure.

[0058] In addition, the present disclosure can repeatedly refer to numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or settings being discussed. In addition, the present disclosure provides examples of various specific processes and materials, but those of ordinary skill in the art can realize the application of other processes and / or the use of other materials.

[0059] The present disclosure will be described below with reference to the drawings and specific examples:

[0060] Organic light-emitting diode (OLED) devices have become increasingly important in people's production and life. As a new generation of display technology, OLED devices have the advantages of soft light emission, fast response speed, full color saturation, wide viewing angle, etc., and are gradually considered by the industry as the most ideal display technology, and have broad application prospects.

[0061] According to the direction of light emission, OLED devices can be divided into bottom-emitting OLED devices and top-emitting OLED devices. In the bottom-emitting OLED device, the thin-film transistor part cannot transmit light, resulting in a smaller light-emitting area; in the top-emitting OLED device, the transparent electrode is on the light-emitting layer side, and the reflective electrode is on the light-emitting layer side, which can make the light emit from the direction opposite to the substrate, and the top-emitting OLED device increases the light transmission area, so the widely studied OLED device is mainly top-emitting.

[0062] White organic light-emitting diode (WOLED) devices are used to achieve different colors by white light transmission through a light filter layer, and have the advantage of easy top emission.

[0063] In related technologies, the WOLED device usually directly contacts the red light-emitting layer and the green light-emitting layer, but under different current driving, the recombination center often shifts, resulting in poor spectral stability of the WOLED, and also affecting the efficiency and life of the WOLED.

[0064] The present inventors have found through research that, in a WOLED device, the electron migration rate is relatively low, the hole injection efficiency is relatively high, the thickness of the green light emitting layer is greater than the thickness of the red light emitting layer, and the thickness of the green light emitting layer and the thickness of the red light emitting layer are arranged in close proximity to each other, which easily causes imbalance between holes and electrons, and causes the shift of the recombination center, thereby affecting the efficiency and service life of the WOLED device.

[0065] Based on the research findings of the present inventors, the following inventive concept is proposed: by controlling 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, the thickness difference between the green light emitting layer and the red light emitting layer is offset to a certain extent, and the preparation material of the hole blocking layer matched in energy level is matched, so that the holes and electrons are balanced, thereby avoiding the shift of the recombination center, and thereby improving the efficiency and service life of the WOLED device.

[0066] Based on the above inventive concept, a display panel is proposed in the embodiments of the present disclosure, as shown in the drawings, which comprises a substrate and a plurality of color light emitting devices arranged on the substrate according to a preset rule, the light emitting device comprising a first electrode layer, a first stack layer, a charge generation layer, a second stack layer and a second electrode layer arranged in sequence. Figure 1 The first stack layer comprises a blue light emitting layer.

[0067] The charge generation layer comprises a hole charge generation layer and an electron charge generation layer arranged in close proximity to each other, and the electron charge generation layer is located on the side close to the first stack layer.

[0068] The second stack layer comprises a red light emitting layer and a green light emitting layer arranged in close proximity 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 stack layer further comprises 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.

[0069] 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, the first distance is less 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.

[0070] 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, the first distance is less 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.

[0071] The display panel provided by the embodiments of the present disclosure can adjust the interface position between the green light emitting layer and the red light emitting layer to a certain extent 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 smaller 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, and can reduce the imbalance between holes and electrons to a certain extent by matching the energy level of the preparation material of the second hole blocking layer with the first distance and the second distance, thereby reducing the offset of the recombination center under different current / voltage driving to a certain extent, making the recombination center as close as possible to the interface between the red light emitting layer and the green light emitting layer, and improving the spectral stability of the display panel, and also improving the efficiency and service life of the display panel.

[0072] As an optional implementation manner, as shown in Figure 1 The first distance is 430 Å~ 480 Å, the second distance is 730 Å~ 790 Å, and the difference between the second distance and the first distance is less than or equal to 300 Å.

[0073] In some embodiments of the present disclosure, the present inventors have found that the offset of the recombination center is generally less than 300 Å, as shown in Figure 1 The first distance is 430 Å~ 480 Å, the second distance is 730 Å~ 790 Å, and the difference between the second distance and the first distance is less than or equal to 300 Å, which can ensure that the first distance is smaller than the second distance, and the offset of the recombination center is offset to a certain extent by the difference between the second distance and the first distance, so that the recombination center is as close as possible to the interface between the red light emitting layer and the green light emitting layer.

[0074] In some embodiments of the present disclosure, optionally, the difference between the second distance and the first distance is 250 Å~ 300 Å.

[0075] In some embodiments of the present disclosure, optionally, the first distance is 450 Å~ 460 Å, the second distance is 750 Å~ 770 Å, and the difference between the second distance and the first distance is 290 Å~ 300 Å.

[0076] In some embodiments of the present disclosure, optionally, the first distance can be 430 Å, 440 Å, 450 Å, 460 Å, 470 Å, or 480 Å; the second distance can be 730 Å, 740 Å, 750 Å, 760 Å, 770 Å, 780 Å, or 790 Å; and the difference between the second distance and the first distance can be 300 Å, 290 Å, 280 Å, 270 Å, 260 Å, or 250 Å.

[0077] As an optional implementation manner, as shown in Figure 1As shown, 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 is 440 Å ~ 470 Å.

[0078] In some embodiments of the present disclosure, as shown in Figure 1 As 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 440 Å ~ 470 Å, that is, the thickness of the green light emitting layer is 260 Å ~ 350 Å, the thickness difference between the green light emitting layer and the red light emitting layer can be reduced to a certain extent, while ensuring that the interface position between the green light emitting layer and the red light emitting layer is adapted to the recombination center.

[0079] As an optional embodiment, the preparation material of the second hole-blocking layer comprises a compound shown in general formula I;

[0080]

[0081] General formula I

[0082] In general formula I, L is selected from groups shown in formula L1 to formula L6:

[0083]

[0084] L1 L2

[0085]

[0086] L3 L4

[0087]

[0088] L5 L6

[0089] In general formula I, R1 and R2 are the same or different from each other, and R1 and R2 are each independently selected from hydrogen, deuterium, halogen, cyano, nitro, substituted or unsubstituted alkyl with carbon atom number of 1 ~ 40, substituted or unsubstituted alkenyl with carbon atom number of 2 ~ 40, substituted or unsubstituted alkynyl with carbon atom number of 2 ~ 40, substituted or unsubstituted cycloalkyl with carbon atom number of 3 ~ 40, substituted or unsubstituted heterocycloalkyl with atom nucleus number of 3 ~ 40, substituted or unsubstituted aryl with carbon atom number of 6 ~ 60, substituted or unsubstituted heteroaryl with atom nucleus number of 5 ~ 60, substituted or unsubstituted alkoxy with carbon atom number of 1 ~ 40, substituted or unsubstituted aryloxy with carbon atom number of 6 ~ 60, substituted or unsubstituted alkylsilyl with carbon atom number of 3 ~ 40, and substituted or unsubstituted arylsilyl with carbon atom number of 6 ~ 60;

[0090] In the general formula I, R3 and R4 are the same as or different from each other, and each of R3 and R4 is 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 1 to 40 carbon atoms, and substituted or unsubstituted arylsilyl having 6 to 60 carbon atoms, and R3 and R4 are not fused with each other or R3 and R4 are fused with each other to form a five-membered ring or a six-membered ring.

[0091] In some embodiments of the present disclosure, the compound shown in the general formula I above can be used as a material for preparing a second hole blocking layer, and the highest occupied molecular orbital energy level of the compound shown in 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 match the degree of imbalance between holes and electrons, the thickness difference between the green light emitting layer and the red light emitting layer, and the energy level of the second hole blocking layer in the display panel, so as to adjust the position of the recombination center, and the recombination center can be located closer to the interface between the green light emitting layer and the red light emitting layer, that is, the shift of the recombination center can be reduced to a certain extent, and thus the spectral stability of the display panel can be improved, and the efficiency and the service life of the display panel can also be improved.

[0092] As an optional embodiment, in the general formula I, R1 and R2 are the same as or different from each other, and each of R1 and R2 is independently selected from substituted or unsubstituted aryl having 6 to 18 carbon atoms; in the general formula I, R3 and R4 are the same as or different from each other, and each of R3 and R4 is independently selected from hydrogen and deuterium; or, each of R3 and R4 is independently selected from substituted or unsubstituted alkyl having 1 to 6 carbon atoms, and R3 and R4 are fused with each other to form a five-membered ring or a six-membered ring.

[0093] In some embodiments of the present disclosure, when the compound shown in the general formula I above is used as a material for preparing a second hole blocking layer, the highest occupied molecular orbital energy level can be higher than 6.0 eV, which can effectively block holes and thus provide higher light emitting efficiency, improve the stability of the display panel, and thus the efficiency and the service life of the display panel can be improved.

[0094] As an optional embodiment, the compound shown in the general formula I is represented by any one of compounds shown in formula 1 to formula 20.

[0095]

[0096] Formula 1 Formula 2

[0097]

[0098] Formula 3 Formula 4

[0099]

[0100] Formula 5 Formula 6

[0101]

[0102] Formula 7 Formula 8

[0103]

[0104] Formula 9 Formula 10

[0105]

[0106] Formula 11 Formula 12

[0107]

[0108] Formula 13 Formula 14

[0109]

[0110] Formula 15 Formula 16

[0111]

[0112] Formula 17 Formula 18

[0113]

[0114] Formula 19 Formula 20

[0115] In some embodiments of the present disclosure, the compounds shown in Formula 1 to Formula 20 can not only satisfy the highest occupied molecular orbital energy level reaching 6.0 eV or more, but also effectively block holes, and thus provide higher light-emitting efficiency, improve the stability of the display panel, and thus can improve the efficiency and life of the display panel.

[0116] In some embodiments of the present disclosure, the compounds of Formulae 1 to 20 can be prepared by methods known in the art. For example, the compound of Formula 5 can be prepared by the following steps:

[0117] <Step 1> Synthesis of 2'-bromospiro[cyclohexane-1,9'-fluorene]

[0118]

[0119] In a 2L reactor, 2-bromo-9H-fluorene (100 g, 407.96 mmol) was placed and stirred after injecting THF 500 ml, and was placed in an ice bath, and the internal temperature was set to -0°C. After KOtBu (93.8 g, 1019 mmol) was added in portions for 15 minutes, it was stirred for 10 minutes. 1,5-dibromopentane (42.7 g, 407.93 mmol) was added dropwise for 5 minutes. Slowly warmed to room temperature, and stirred for 8 hours. After the reaction was completed, it was extracted with dichloromethane, and filtered by adding MgSO4. 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.

[0120] 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)

[0121] <Step 2> Synthesis of Core 1

[0122]

[0123] To a solution of 2'-bromospiro[cyclohexane-l,9'-fluorene] (78.2.2 g, 249.6 mmol) and 4,4,4',4',5,5,5',5'-octamethyl-2,2'-bi(l,3,2-dioxaborolane) (76 g, 299.5 mmol) and Pd(dppf)Cl2(5.48 g, 7.48 mmol), KOAc (73.5 g, 748.9 mmol), Xphos (11.9 g, 24.96 mmol) in 1,4-Dioxane 750 ml was heated at reflux for 12 hours. After the reaction was completed, it was extracted with dichloromethane and filtered with MgSO4. After removing the solvent from the filtered organic layer, the target compound Core 1 (70.2 g, yield 78%) was obtained by column chromatography.

[0124] 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)

[0125] <Step 3> Synthesis of the compound represented by Formula 5

[0126]

[0127] To a solution of Core 1 (6.3 g, 17.4 mmol) and 2-(3-chlorophenyl)-4,6-diphenyl- 1,3,5-triazine (5.0 g, 14.5 mmol) and Pd(OAc)2(0.09 g, 0.43 mmol), Cs2CO3(9.4 g, 29.1 mmol), Xphos (0.69 g, 1.45 mmol) in Toluene 100 ml, EtOH 25 ml, H2O 25 ml was heated at reflux for 12 hours. After the reaction was completed, it was extracted with dichloromethane and filtered with MgSO4. After removing the solvent from the filtered organic layer, the target compound represented by Formula 5 (5.3 g, yield 67%) was obtained by column chromatography.

[0128] As an optional embodiment, the second stack layer further comprises 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.

[0129] In some embodiments of the present disclosure, the display panel can, according to design needs, make the second stack layer further comprise 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.

[0130] As an optional embodiment, the first stack layer further comprises 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.

[0131] In some embodiments of the present disclosure, the display panel can, according to design needs, make the first stack layer further comprise 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.

[0132] In some embodiments of the present disclosure, the substrate can be selected from any transparent rigid or flexible substrate material, for example, the substrate can be glass or polyimide.

[0133] In some embodiments of the present disclosure, the first electrode layer can be an anode, and the material for preparing the anode can be selected from electrode materials with high work function. Alternatively, the material for preparing the anode can be a metal material, such as any one of copper (Cu), gold (Au), silver (Ag), iron (Fe), chromium (Cr), nickel (Ni), palladium (Pd), and platinum (Pt), or an alloy composed of several of them; the material for preparing the anode can also be a metal oxide, such as any one of indium oxide (In2O3), zinc oxide (ZnO), indium tin oxide (ITO), and indium zinc oxide (IZO), or several of them. The material for preparing the anode can also be a self-conducting polymer, such as any one of polyaniline, polypyrrole, and poly(3-methylthiophene), carbon nanotube (CNT), and graphene oxide (GO), or several of them. The material for preparing the anode can also be a composite electrode formed by the above-mentioned materials, such as ITO / Ag / ITO, Ag / IZO, CNT / ITO, CNT / IZO, GO / ITO, and GO / IZO. In addition to the above-mentioned anode materials, the material for preparing the anode can also be a material facilitating hole injection and combinations thereof, including known materials suitable for anodes.

[0134] In some embodiments of the present disclosure, the second electrode layer can be a cathode, and the material for preparing the cathode can be selected from electrode materials with low work function, so as to easily inject electrons into the organic layer between the first electrode layer and the second electrode layer. Alternatively, the second electrode layer can have good light transmittance and conductivity. Alternatively, the material for preparing the cathode can 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 can 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 above-mentioned cathode materials, the material for preparing the cathode can also be a material facilitating electron injection and combinations thereof, including known materials suitable for cathodes.

[0135] In some embodiments of the present disclosure, the material for preparing the first hole injection layer can 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, manganese oxide; the material for preparing the first hole injection layer can be a dopant of a strong electron-accepting system, such as F4TCNQ, HATCN; the material for preparing the first hole injection layer can also be P-doped by a p-dopant to form the first hole injection layer by co-evaporation.

[0136] In some embodiments of the present disclosure, the material for preparing the first hole transport layer and the material for preparing the second hole transport layer can be the same or different. Optionally, the material for preparing the first hole transport layer and the material for preparing the second hole transport layer can each independently be selected from an aromatic amine or a carbazole material having hole transport properties, such as 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’-di(9-carbazolyl) biphenyl (CBP), and 9-phenyl-3-[4-(10-phenyl-9-anthryl)phenyl]-9H-carbazole (PCzPA), etc.

[0137] In some embodiments of the present disclosure, the material for preparing the first electron blocking layer and the material for preparing the second electron blocking layer can be the same or different. Optionally, the material for preparing the first electron blocking layer and the material for preparing the second electron blocking layer can each independently be selected from an aromatic amine or a carbazole material having hole transport properties, such as 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’-di(9-carbazolyl) biphenyl (CBP), and 9-phenyl-3-[4-(10-phenyl-9-anthryl)phenyl]-9H-carbazole (PCzPA), etc.

[0138] In some embodiments of the present disclosure, the material for preparing the first hole-blocking layer can be the same as the material for preparing the second hole-blocking layer. The material for preparing the first hole-blocking layer can also be different from the material for preparing the second hole-blocking layer. For example, the material for preparing the first hole-blocking layer can be a heterocyclic aromatic compound, such as a benzimidazole derivative, an imidazopyridine derivative, and an imidazo-benzo-phenanthroline derivative, and the like imidazole derivative; the material for preparing the first hole-blocking layer can be a pyrimidine derivative and a triazine derivative, and the like azine derivative; the material for preparing the first hole-blocking layer can also be a quinoline derivative, an isoquinoline derivative, and a phenanthroline derivative, and the like compound containing a nitrogen six-membered ring structure, wherein, the compound also includes a compound having a phosphine oxide-based substituent 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), bathophenanthroline (BPhen), bathocuproin (BCP), 4,4'-bis(5-methylbenzoxazol-2-yl)stilbene (BzOs), and 1,3,4-oxadiazole, and the like can also be used.

[0139] In some embodiments of the present disclosure, the preparation material of the first electron transport layer and the preparation material of the second electron transport layer can be the same or different, and the preparation material of the first electron transport layer and the preparation material of the second electron transport layer can be selected from materials with good electron transport properties. Optionally, the preparation material of the first electron transport layer and the preparation material of the second electron transport layer can each independently be selected from heterocyclic aromatic compounds, such as benzimidazole derivatives, imidazopyridine derivatives, and imidazole derivatives such as benzimidazophenanthroline derivatives; the preparation material of the first electron transport layer and the preparation material of the second electron transport layer can each independently be selected from pyrimidine derivatives and triazine derivatives, and the like; the preparation material of the first electron transport layer and the preparation material of the second electron transport layer can each independently be selected from compounds containing a nitrogen six-membered ring structure, such as quinoline derivatives, isoquinoline derivatives, and phenanthroline derivatives, wherein the compounds also include compounds having a phosphine oxide group as a substituent on the heterocycle; the preparation material of the first electron transport layer and the preparation material of the second electron transport layer can each independently be selected from 2-(4-biphenyl)-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-biphenyl)-1,2,4-triazole (TAZ), 3-(4-tert-butylphenyl)-4-(4-ethylphenyl)-5-(4-biphenyl)-1,2,4-triazole (p-EtTAZ), bathophenanthroline (BPhen), bathocuproin (BCP) 4,4'-bis(5-methylbenzoxazol-2-yl)stilbene (BzOs), and 1,3,4-oxadiazole, and the like.

[0140] In some embodiments of the present disclosure, the preparation material of the second electron injection layer is selected from materials with electron transport capability, and also needs to have the effect of injecting electrons from the cathode and excellent film formation performance. The preparation material of the second electron injection layer can be any one or several of alkali metal materials, metal materials, alkali metal compounds, and metal compounds, such as any one or several of lithium fluoride (LiF), ytterbium (Yb), magnesium (Mg), and calcium (Ca).

[0141] 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 light emitting layers, and the preparation material of the light emitting layer can use phosphorescent host materials and phosphorescent guest materials; or can use 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; and the fluorescent host material can include one material or two or more materials.

[0142] In some embodiments of the present 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, styrylamine derivatives and metal complexes, such as TBPe, BDAVBi, DPAVBi and FIrpic.

[0143] In some embodiments of the present 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).

[0144] In some embodiments of the present disclosure, the host material of the green light emitting layer can be selected from coumarin dyes, quinacridone copper derivatives, polycyclic aromatic hydrocarbons, 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).

[0145] As an optional implementation, the blue light emitting layer is provided with a first light emitting auxiliary layer on the side close to the first hole transport layer, and / or the red light emitting layer is provided with a second light emitting auxiliary layer on the side close to the second hole transport layer, and / or the green light emitting layer is provided with a third light emitting auxiliary layer on the side close to the second hole transport layer.

[0146] In some embodiments of the present disclosure, the first light emitting auxiliary layer has good hole transport performance, can form a multi-layer hole transport layer structure with the first hole transport layer, and is mainly used for assisting the first hole transport layer, so that the holes transferred from the anode can move smoothly to the blue light emitting layer, and the electrons transferred from the cathode can be blocked to limit the electrons in the blue light emitting layer, thereby reducing the potential barrier between the first hole transport layer and the blue light emitting layer, reducing the driving voltage of the display panel to some extent, improving the utilization rate of holes, and improving the efficiency and service life 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, which will not be described here. The preparation materials of the first light emitting auxiliary layer, the second light emitting auxiliary layer and the third light emitting auxiliary layer can be independently selected from arylamine or carbazole materials, such as CBP and PCzPA.

[0147] As an optional implementation, the light-emitting device further comprises a thin film encapsulation layer and a filter layer, the thin film encapsulation layer is arranged on the side of the second electrode layer away from the second stack layer, and the filter layer is arranged on the side of the thin film encapsulation layer away from the second electrode layer; the filter layer comprises 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.

[0148] In some embodiments of the present disclosure, the thin film encapsulation layer covers the side of the second electrode layer away from the second stack layer to isolate the display panel from the outside world and block water and oxygen from corroding the internal structure of the display panel.

[0149] In some embodiments of the present disclosure, the light-emitting device of each color in the display panel can comprise a blue light-emitting device, a red light-emitting device and a green light-emitting device. Correspondingly, the filter layer comprises 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. Then, the red light-emitting device cooperates with the red filter layer to make the display panel emit red light, the green light-emitting device cooperates with the green filter layer to make the display panel emit green light, and the blue light-emitting device cooperates with the blue filter layer to make the display panel emit blue light.

[0150] As an optional implementation, the light-emitting device further comprises a planarization layer, the planarization layer is arranged on the side of the filter layer close to the thin film encapsulation layer and / or the planarization layer is arranged on the side of the filter layer away from the thin film encapsulation layer.

[0151] In some embodiments of the present disclosure, by arranging the planarization layer on the side of the filter layer close to the thin film encapsulation layer and / or 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 is convenient for the arrangement of subsequent structure layers; on the other hand, the planarization layer can reduce the internal stress concentration, so that the display panel is more uniform and stable.

[0152] In some embodiments of the present disclosure, as Figure 1As shown, the display panel comprises, 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 (Cathode), a thin film encapsulation layer (TFE), a first planarization layer, a filter layer, and a second planarization layer.

[0153] In the embodiments of the present disclosure, the display panel has the strongest peaks in the 500 nm-540 nm waveband and the 600 nm-650 nm waveband, respectively. When driven by a voltage of 6.5 V, the intensity difference between the strongest peak in the 500 nm-540 nm waveband and the strongest peak in the 600 nm-650 nm waveband is a first intensity difference X1, and when driven by a voltage of 9 V, the intensity difference between the strongest peak in the 500 nm-540 nm waveband and the strongest peak in the 600 nm-650 nm waveband is a second intensity difference X2. 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. It has been verified by experiments that the intensity difference ratio Y of the display panel of the embodiments of the present disclosure is less than 0.7. It can be seen that the spectral fluctuation of the display panel of the embodiments of the present disclosure is small, and the display panel can achieve high spectral stability, and at the same time, the efficiency and the service life of the display panel can be improved.

[0154] The display panel of the embodiments of the present disclosure can be prepared by a conventional method. 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 embodiments of the present disclosure, and details are not described herein.

[0155] The display panel of the present application is further described below in combination with experimental data.

[0156] Embodiment 1

[0157] As Figure 1As shown, the display panel of Example 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.

[0158] The first hole injection layer (HIL1) has a thickness of 100 Å, the first hole transport layer (HTL1) has a thickness of 80 Å, the first electron blocking layer (EBL1) has a thickness of 50 Å, the blue light emitting layer (B-EML) has a thickness of 220 Å, the first hole blocking layer (HBL1) has a thickness of 50 Å, the first electron transport layer (ETL1) has a thickness of 100 Å, the electron charge generation layer (N-CGL) has a thickness of 100 Å, the hole charge generation layer (P-CGL) has a thickness of 70 Å, the second hole transport layer (HTL2) has a thickness of 230 Å, the second electron blocking layer (EBL2) has a thickness of 50 Å, the red light emitting layer (R-EML) has a thickness of 100 Å, the green light emitting layer (G-EML) has a thickness of 300 Å, the second hole blocking layer (HBL2) has a thickness of 70 Å, the second electron transport layer (ETL2) has a thickness of 40 Å, the second electron injection layer (EIL2) has a thickness of 10 Å, and the cathode has a thickness of 130 Å. The first distance is 450 Å, the second distance is 740 Å, and the third distance is 460 Å.

[0159] The preparation materials of the first hole injection layer (HIL1) and the second hole injection layer (HIL1) include a compound shown in Formula A-1:

[0160]

[0161] Formula A-1

[0162] The preparation materials of the first hole transport layer (HTL1) and the second hole transport layer (HTL2) include a compound shown in Formula A-2, respectively:

[0163]

[0164] Formula A-2

[0165] The material for preparing the first electron blocking layer (EBL1) includes a compound represented by Formula A-3:

[0166]

[0167] Formula A-3

[0168] The material for preparing the blue light emitting layer (B-EML) includes a compound represented by Formula A-4 and Formula A-5:

[0169]

[0170] Formula A-4 Formula A-5

[0171] The material for preparing the first hole blocking layer (HBL1) and the second hole blocking layer (HBL2) includes a compound represented by Formula 3, respectively:

[0172]

[0173] Formula 3

[0174] The material for preparing the first electron transport layer (ETL1), the second electron transport layer (ETL2), and the hole charge generation layer (P-CGL) includes a compound represented by Formula A-6 and Formula A-7, respectively:

[0175]

[0176] Formula A-6 Formula A-7

[0177] The material for preparing the electron charge generation layer (N-CGL) includes a compound represented by Formula A-8, respectively:

[0178]

[0179] Formula A-8

[0180] The material for preparing the second electron blocking layer (EBL2) includes a compound represented by Formula A-9, respectively:

[0181]

[0182] Formula A-9

[0183] The material for preparing the red light emitting layer (R-EML) includes a compound represented by Formula A-11, Formula A-11, and Formula A-12, respectively:

[0184]

[0185] Formula A-10 Formula A-11 Formula A-12

[0186] The preparation materials of the green light-emitting layer (G-EML) respectively include compounds shown in Formula A-13, Formula A-14 and Formula A-15:

[0187]

[0188] Formula A-13 Formula A-14 Formula A-15

[0189] The preparation material of the second electron injection layer (EIL2) includes Yb.

[0190] The display panel of Example 1 is tested, and the result shows that the intensity difference ratio Y thereof is 0.5.

[0191] Examples 2 to 10

[0192] The structural layers of the display panels of Examples 2 to 10 and the preparation materials of the respective structural layers are the same as those of Example 1, and the differences between the display panels of Examples 2 to 10 and Example 1 are shown in Table 1.

[0193] Comparative Examples 1 to 5

[0194] The structural layers of the display panels of Comparative Examples 1 to 5 and the preparation materials of the respective structural layers are the same as those of Example 1, and 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 shown in Formula 21:

[0195]

[0196] Formula A-16

[0197] 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.

[0198] Table 1 Differences between examples and comparative examples and results of spectral stability experiments

[0199]

[0200] As can be seen from the experimental results in Table 1, the display panel of the embodiments 1 to 10 of the present disclosure can make the intensity difference ratio Y less than 0.7, so it can be known that the display panel of the embodiments of the present disclosure can improve the charge transport performance of the display panel by controlling the first distance, the second distance, the third distance and the preparation material of the second hole blocking layer, can reduce the shift of the recombination center to a certain extent, can make the spectral fluctuation of the display panel smaller, can realize higher spectral stability, and can also achieve higher efficiency and longer life of the display panel.

[0201] As can be seen from the experimental results in Table 1, the display panel of the comparative example 1 cannot effectively improve the charge transport performance of the display panel due to the larger third distance, so that the intensity difference ratio Y reaches 1.1, resulting in larger spectral fluctuation of the display panel. The preparation material of the second hole blocking layer of the display panel of the comparative example 2 cannot match the display panel due to the highest occupied molecular orbital energy level and the lowest unoccupied molecular orbital energy level, so that the intensity difference ratio Y is 0.8, which is obviously higher than the spectral fluctuation range of the display panel of the embodiments of the present disclosure. The third distance of the display panel of the comparative example 3 is larger, and the preparation material of the second hole blocking layer cannot match the display panel due to the highest occupied molecular orbital energy level and the lowest unoccupied molecular orbital energy level, so that 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 embodiments of the present disclosure. The difference between the second distance and the first distance of the display panel of the comparative example 4 is large, so that the intensity difference ratio Y is also increased to 0.9, which is obviously higher than the spectral fluctuation range of the display panel of the embodiments of the present disclosure. The difference between the second distance and the first distance of the display panel of the comparative example 5 is large, and the preparation material of the second hole blocking layer cannot match the display panel due to the highest occupied molecular orbital energy level and the lowest unoccupied molecular orbital energy level, so that 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 embodiments of the present disclosure. The difference between the second distance and the first distance of the display panel of the comparative example 6 is small, so that the intensity difference ratio Y is also increased, which is relatively higher than the spectral fluctuation range of the display panel of the embodiments of the present disclosure. The third distance of the display panel of the comparative example 7 is small, so that the intensity difference ratio Y is also increased to 0.87, which is obviously higher than the spectral fluctuation range of the display panel of the embodiments of the present disclosure.

[0202] Based on the same inventive concept, the present disclosure provides a display module, which comprises the display panel described above.

[0203] Since the display module provided by the present disclosure comprises the display panel of the technical solution described above, the display module provided by the present disclosure has all the beneficial effects of the display panel described above, which will not be repeated here.

[0204] Based on the same inventive concept, the display device provided by the present disclosure comprises the display module described above.

[0205] The display device provided by the present disclosure comprises the display module of the technical solution described above, and therefore has all the beneficial effects of the display module described above, which will not be repeated here.

[0206] In the present disclosure, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "under", "below" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0207] In addition, in the present disclosure, the description such as "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present disclosure, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0208] In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor is it within the protection scope required by the present disclosure.

[0209] Although the embodiments of the present disclosure have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present disclosure, and the scope of the present disclosure is defined by the claims and their equivalents.

Claims

1. A display panel, characterized by, The display panel comprises a substrate and light-emitting devices of multiple colors arranged on the substrate according to a preset rule, the light-emitting device comprising a first electrode layer, a first stack layer, a charge generation layer, a second stack layer and a second electrode layer arranged in sequence; The first stack layer comprises a blue light-emitting layer; The charge generation layer comprises a hole charge generation layer and an electron charge generation layer arranged in close proximity to each other, the electron charge generation layer being located on the side close to the first stack layer; The second stack layer comprises a red light-emitting layer and a green light-emitting layer arranged in close proximity to each other, the green light-emitting layer being located on the side of the red light-emitting layer close to the second electrode layer; the second stack layer further comprises a second hole blocking layer, the second hole blocking layer being located on the side of the green light-emitting layer close to the second electrode layer; 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-6.3 eV, and the lowest unoccupied molecular orbital energy level is 2.4 eV-2.8 eV; the first distance is 430 Å-480 Å, and the second distance is 730 Å-790 Å, and the difference between the second distance and the first distance is less than or equal to 360 Å.

2. The display panel of claim 1, wherein, The difference between the second distance and the first distance is less than or equal to 300 Å.

3. The display panel of claim 1, wherein, 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 is 440 Å-470 Å.

4. The display panel of claim 3, wherein, The material for preparing the second hole blocking layer comprises a compound represented by general formula I, General formula I In general formula I, L is selected from linking groups represented by formula L1-L6: L1 L2 L3 L4 L5 L6 In 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 with 1-40 carbon atoms, substituted or unsubstituted alkenyl with 2-40 carbon atoms, substituted or unsubstituted alkynyl with 2-40 carbon atoms, substituted or unsubstituted cycloalkyl with 3-40 carbon atoms, substituted or unsubstituted heterocycloalkyl with 3-40 atomic nuclei, substituted or unsubstituted aryl with 6-60 carbon atoms, substituted or unsubstituted heteroaryl with 5-60 atomic nuclei, substituted or unsubstituted alkoxy with 1-40 carbon atoms, substituted or unsubstituted aryloxy with 6-60 carbon atoms, substituted or unsubstituted alkylsilyl with 1-40 carbon atoms, and substituted or unsubstituted arylsilyl with 6-60 carbon atoms; In the general formula I, R3 and R4 are the same as or different from each other, and each of R3 and R4 is 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 1 to 40 carbon atoms, and substituted or unsubstituted arylsilyl having 6 to 60 carbon atoms, and R3 and R4 are not fused with each other or R3 and R4 are fused with each other to form a five-membered ring or a six-membered ring.

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

6. The display panel of claim 4, wherein, The compound represented by the general formula I is represented by any one of compounds represented by formulae 1 to 20: Formula 1 Formula 2 Formula 3 Formula 4 Formula 5 Formula 6 Formula 7 Formula 8 Formula 9 Formula 10 Formula 11 Formula 12 Formula 13 Formula 14 Formula 15 Formula 16 Formula 17 Formula 18 Formula 19 Formula 20.

7. The display panel according to any one of claims 3 to 6, wherein The light-emitting device further comprises 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 stack 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 comprises 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 of claim 7, wherein, The light-emitting device further comprises a planarization layer, 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 away from the thin film encapsulation layer.

9. A display module, characterized by The display module comprises the display panel according to any one of claims 1 to 8.

10. A display device, characterized by comprising: The display device comprises the display module according to claim 9.

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