Organic electroluminescent device and display panel

Abstract

The invention discloses an organic light-emitting device, and a light-emitting unit comprises a first light-emitting layer, a first electron blocking layer, a second light-emitting layer and a second electron blocking layer. At least one light emitting unit further comprises an isolation layer arranged between the first electron blocking layer and the second electron blocking layer, and the orthographic projection of the isolation layer on the substrate covers the orthographic projection of the first electron blocking layer on the substrate and covers the orthographic projection of the second electron blocking layer on the substrate; the transverse conductivity of the isolation layer is lower than the transverse conductivity of the first electron blocking layer and the transverse conductivity of the second electron blocking layer. The transverse conductivity of the isolation layer is smaller than the transverse conductivity of the first electron blocking layer and the transverse conductivity of the second electron blocking layer, the isolation layer is beneficial for reducing transverse conductivity between the first light-emitting layer and the second light-emitting layer, and then the possibility of color crosstalk is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of light sources, and in particular to an organic electroluminescent device and a display panel. Background Art

[0002] Organic electroluminescent devices are an advanced display technology that has the advantages of self-luminescence, high contrast, low power consumption, and flexibility. When designing devices, ideally, the three primary color devices of red, green, and blue can work independently to achieve the best display effect. However, in actual products, due to the crosstalk phenomenon of different colors in the light-emitting unit, the display effect will be affected, resulting in impure colors and reduced image quality. Summary of the invention

[0003] In view of this, the present application provides an organic electroluminescent device and a display panel, aiming to improve the crosstalk phenomenon of different colors in a light-emitting unit.

[0004] The embodiment of the present application is implemented as follows: in a first aspect, an organic electroluminescent device is provided, comprising:

[0005] substrate;

[0006] A first electrode is disposed on one side of the substrate;

[0007] at least one light-emitting unit, disposed on a side of the first electrode facing away from the substrate;

[0008] A second electrode is disposed on a side of the light-emitting unit away from the first electrode;

[0009] Each of the light emitting units comprises:

[0010] A first light-emitting layer is disposed on a side of the first electrode away from the substrate;

[0011] A first electron blocking layer is disposed between the first electrode and the first light-emitting layer;

[0012] A second light-emitting layer is disposed on a side of the first electrode away from the substrate and is disposed adjacent to the first light-emitting layer in the same layer;

[0013] A second electron blocking layer is disposed between the first electrode and the second light-emitting layer;

[0014] At least one of the light emitting units further comprises:

[0015] an isolation layer, disposed between the first electron blocking layer and the second electron blocking layer, wherein the orthographic projection of the isolation layer on the substrate covers the orthographic projection of the first electron blocking layer on the substrate, and covers the orthographic projection of the second electron blocking layer on the substrate;

[0016] The lateral conductivity of the isolation layer is lower than the lateral conductivity of the first electron blocking layer and the second electron blocking layer.

[0017] Optionally, in some embodiments of the present application, the first electron blocking layer is arranged on the side of the isolation layer away from the first electrode, and the first electron blocking layer is arranged in contact with the first light-emitting layer; the second electron blocking layer is arranged on the side of the isolation layer close to the first electrode, and the second electron blocking layer is arranged in non-contact with the second light-emitting layer.

[0018] Optionally, in some embodiments of the present application, the first electron blocking layer is arranged on a side of the isolation layer close to the first electrode, and the first electron blocking layer is arranged in non-contact with the first light-emitting layer; the second electron blocking layer is arranged on a side of the isolation layer away from the first electrode, and the second electron blocking layer is arranged in contact with the second light-emitting layer.

[0019] Optionally, in some embodiments of the present application, the first light-emitting layer includes a red light-emitting layer, and the second light-emitting layer includes a green light-emitting layer.

[0020] Optionally, in some embodiments of the present application, the first electron blocking layer includes a red electron blocking layer, and the second electron blocking layer includes a green electron blocking layer.

[0021] Optionally, in some embodiments of the present application, each of the light-emitting units further includes:

[0022] A third light-emitting layer is disposed on the substrate and is disposed adjacent to the first light-emitting layer and / or the second light-emitting layer in the same layer;

[0023] A third electron blocking layer is disposed between the third light-emitting layer and the first electrode;

[0024] Wherein, the third electron blocking layer and the isolation layer are in the same layer and made of the same material.

[0025] Optionally, in some embodiments of the present application, the third light-emitting layer includes a blue light-emitting layer, the third electron blocking layer includes a blue electron blocking layer, and the blue electron blocking layer and the isolation layer are in the same layer and made of the same material.

[0026] Optionally, in some embodiments of the present application, the light-emitting unit includes two stacked light-emitting units, and each of the light-emitting units includes an isolation layer.

[0027] Optionally, in some embodiments of the present application, a charge generation layer is further included, and the charge generation layer is arranged between two adjacent light-emitting units.

[0028] Optionally, in some embodiments of the present application, the thickness of the isolation layer is less than or equal to 20 nm.

[0029] Optionally, in some embodiments of the present application, the thickness of the isolation layer is less than or equal to 10 nm.

[0030] Optionally, in some embodiments of the present application, the isolation layer includes a first isolation layer and a second isolation layer, and the first isolation layer and the second isolation layer are arranged in the same layer; the lateral conductivity of the first isolation layer is less than or greater than the lateral conductivity of the second isolation layer.

[0031] Optionally, in some embodiments of the present application, the isolation layer includes a first isolation layer and a second isolation layer, the first isolation layer has a lateral conductivity smaller than or larger than that of the second isolation layer, and the first isolation layer and the second isolation layer are not arranged on the same layer.

[0032] In a second aspect, a display panel is provided, comprising the aforementioned organic electroluminescent device.

[0033] The organic electroluminescent device of the present application has an isolation layer disposed between the first electron blocking layer and the second electron blocking layer. The lateral conductivity of the isolation layer is smaller than that of the first electron blocking layer and the second electron blocking layer. The isolation layer is beneficial to reducing the lateral conductivity between the first light-emitting layer and the second light-emitting layer, thereby reducing the possibility of color crosstalk. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 It is a structural schematic diagram of a light-emitting device provided by the prior art;

[0036] Figure 2 is a schematic structural diagram of a light-emitting device provided in an embodiment of the present application;

[0037] Figure 3 is a schematic structural diagram of another light-emitting device provided in an embodiment of the present application;

[0038] Figure 4 is a schematic structural diagram of another light-emitting device provided in an embodiment of the present application;

[0039] Figure 5 is a schematic structural diagram of another light-emitting device provided in an embodiment of the present application;

[0040] Figure 6 is a schematic structural diagram of another light-emitting device provided in an embodiment of the present application;

[0041] Figure 7 is a schematic structural diagram of another light-emitting device provided in an embodiment of the present application;

[0042] Figure 8 is a schematic structural diagram of another light-emitting device provided in an embodiment of the present application;

[0043] Fig. 9 It is a schematic diagram of the structure of another light-emitting device provided in an embodiment of the present application.

[0044] Reference numerals:

[0045] 100. Substrate;

[0046] 200, a first electrode;

[0047] 300, light-emitting unit; 301, first light-emitting layer; 302, first electron blocking layer; 303, second light-emitting layer; 304, second electron blocking layer; 305, third light-emitting layer; 306, third electron blocking layer; 307, hole injection layer; 308, hole transport layer; 309, hole blocking layer; 310, electron transport layer; 311, electron injection layer; 312, charge generation layer;

[0048] 400. a second electrode;

[0049] 500. Isolation layer. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0052] In this application, unless otherwise stated, directional words such as "upper" and "lower" generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inner" and "outer" refer to the outline of the device. In addition, in the description of this application, the term "including" means "including but not limited to". The terms first, second, third, etc. are used only as labels and do not impose numerical requirements or establish an order.

[0053] In this application, "and / or" describes the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural.

[0054] In the present application, "at least one" means one or more, and "plurality" means two or more. "One or more", "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single items or plural items. For example, "at least one of a, b, or c", or "at least one of a, b, and c" can all mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be single or multiple, respectively.

[0055] In the present application, when a layer is formed "on" another layer, the so-called "on" is a broad concept, which may indicate that the formed another layer is adjacent to the certain layer, or may indicate that there are other spacing structural layers between the another layer and the certain layer. For example, when a second electrode is formed "on" the first carrier functional layer, the so-called "on" may indicate that the formed second electrode is adjacent to the first carrier functional layer, or may indicate that there are other spacing structural layers between the second electrode and the first carrier functional layer, such as a light-emitting layer.

[0056] Various embodiments of the present application may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be understood as a rigid limitation on the scope of the present application; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numerical values ​​within the range. For example, the range description from 1 to 6 should be considered to have specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which apply regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.

[0057] See also Figure 1At present, most of the light-emitting devices on the market include a substrate 100, a first electrode 200, a second electrode 400, and a light-emitting unit 300 disposed between the first electrode 200 and the second electrode 400. The light-emitting unit 300 usually includes red, green, and blue, and the red, green, and blue need to work independently. However, in actual products, color crosstalk may occur between adjacent colors of the three primary colors.

[0058] In view of this, the first aspect of the present application provides an organic electroluminescent device, comprising:

[0059] substrate;

[0060] A first electrode is disposed on one side of the substrate;

[0061] At least one light-emitting unit is disposed on a side of the first electrode facing away from the substrate;

[0062] A second electrode is disposed on a side of the light emitting unit away from the first electrode;

[0063] Each light emitting unit comprises:

[0064] A first light-emitting layer is arranged on a side of the first electrode away from the substrate;

[0065] A first electron blocking layer is disposed between the first electrode and the first light-emitting layer;

[0066] A second light-emitting layer is arranged on a side of the first electrode away from the substrate and is arranged adjacent to the first light-emitting layer in the same layer;

[0067] A second electron blocking layer is disposed between the first electrode and the second light-emitting layer;

[0068] At least one light emitting unit further comprises:

[0069] An isolation layer is disposed between the first electron blocking layer and the second electron blocking layer, and an orthographic projection of the isolation layer on the substrate covers an orthographic projection of the first electron blocking layer on the substrate, and covers an orthographic projection of the second electron blocking layer on the substrate;

[0070] The lateral conductivity of the isolation layer is lower than the lateral conductivity of the first electron blocking layer and the second electron blocking layer.

[0071] The present application sets an isolation layer in at least one light-emitting unit, and the lateral conductivity of the isolation layer is lower than the lateral conductivity of the first electron blocking layer and the second electron blocking layer, so as to reduce the possibility of lateral conduction between adjacent colors, thereby reducing the crosstalk effect of adjacent color pixels.

[0072] In some embodiments of the present application, the substrate may be a rigid substrate or a flexible substrate. The material of the substrate may include but is not limited to one or more of glass, silicon wafer, polycarbonate, polymethyl methacrylate, polyethylene terephthalate, polyethylene naphthalate, polyamide and polyether sulfone.

[0073] In some embodiments of the present application, the first electrode and the second electrode are electrodes known in the art for light-emitting devices, for example, they may independently include but are not limited to doped metal oxide electrodes, composite electrodes, graphene electrodes, carbon nanotube electrodes, metal single-substance electrodes or alloy electrodes. The material of the doped metal oxide electrode may include but is not limited to one or more of indium-doped tin oxide (ITO), fluorine-doped tin oxide (FTO), antimony-doped tin oxide (ATO), aluminum-doped zinc oxide (AZO), gallium-doped zinc oxide (GZO), indium-doped zinc oxide (IZO), magnesium-doped zinc oxide (MZO), aluminum-doped magnesium oxide (AMO), and cadmium-doped zinc oxide. The composite electrode is an electrode formed by stacking two or more layers of conductive materials, such as AZO / Ag / AZO, AZO / Al / AZO, ITO / Ag / ITO, ITO / Al / ITO, ZnO / Ag / ZnO, ZnO / Al / ZnO, TiO2 / Ag / TiO2, TiO2 / Al / TiO2, ZnS / Ag / ZnS, ZnS / Al / ZnS, Ca / Al, LiF / Ca, LiF / Al, BaF2 / Al, CsF / Al, CaCO3 / Al, BaF2 / Ca / Al, etc., where " / " represents a stacked structure, for example, AZO / Ag / AZO represents a composite electrode including a sequentially stacked AZO layer, an Ag layer, and an AZO layer. The material of the metal single substance electrode may include, but is not limited to, one or more of Ag, Ni, Pt, Au, Ir, Cu, Mo, Al, Ca, Mg, and Ba. Alloy electrodes include, but are not limited to, Au:Mg alloy electrodes and Ag:Mg alloy electrodes.

[0074] In some embodiments of the present application, the first electrode may be an anode. The anode is an electrode with a relatively high work function, for example, it may include but is not limited to a doped metal oxide electrode with a relatively high work function, a metal single substance electrode with a relatively high work function, and a carbon nanotube electrode. The metal single substance electrode with a relatively high work function may be selected from but is not limited to Ni, Pt, Au, Ag, Ir, etc.

[0075] In some embodiments of the present application, the second electrode may be a cathode, and the cathode is an electrode with a relatively low work function, for example, it may include but is not limited to a metal single substance electrode with a relatively low work function, a composite electrode with a relatively low work function, and an alloy electrode with a relatively low work function. The metal single substance electrode with a relatively low work function may be Ca, Ba, Al, Mg, etc. The composite electrode with a relatively low work function may be Ca / Al, LiF / Ca, LiF / Al, BaF2 / Al, CsF / Al, CaCO3 / Al, BaF2 / Ca / Al, etc. The alloy electrode with a relatively low work function may be Au:Mg and Ag:Mg, etc.

[0076] In some embodiments of the present application, the colors of the first light-emitting layer and the second light-emitting layer are not limited. The first light-emitting layer can be any one of a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer, and the second light-emitting layer can also be any one of a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer, but the first light-emitting layer and the second light-emitting layer cannot use light-emitting layers of the same color at the same time.

[0077] In some embodiments of the present application, the first light-emitting layer may be a red light-emitting layer, and the second light-emitting layer may be a green light-emitting layer. There is a color crosstalk effect between the red light-emitting layer and the green light-emitting layer.

[0078] In some embodiments of the present application, the first light-emitting layer may be a green light-emitting layer, and the second light-emitting layer may be a blue light-emitting layer. There is a color crosstalk effect between the green light-emitting layer and the blue light-emitting layer.

[0079] In some embodiments of the present application, the first light-emitting layer may be a red light-emitting layer, and the second light-emitting layer may be a green light-emitting layer; the first electron blocking layer may be a red electron blocking layer, and the second electron blocking layer may be a green electron blocking layer, so that the first electron blocking layer corresponds to the first light-emitting layer, and the second electron blocking layer corresponds to the second light-emitting layer.

[0080] In some embodiments of the present application, the first light-emitting layer may be a green light-emitting layer, the second light-emitting layer may be a blue light-emitting layer, the first electron blocking layer may be a green electron blocking layer, and the second electron blocking layer may be a blue electron blocking layer.

[0081] It should be noted that the overlap between the red light-emitting layer and the green light-emitting layer has a greater impact on the crosstalk between the red and green pixels, so the color crosstalk between the red light-emitting layer and the green light-emitting layer is also more obvious.

[0082] In some embodiments of the present application, the isolation layer may be a material layer with low lateral conductivity.

[0083] It should be noted that, since the isolation layer is arranged between the first electron blocking layer and the second electron blocking layer, the low lateral conductivity can be understood as relative to the lateral conductivity of the first electron blocking layer and the second electron blocking layer. Therefore, the low lateral conductivity does not mean that the conductivity is small, but it is small compared to the lateral conductivity of the first electron blocking layer and the second electron blocking layer.

[0084] In some embodiments of the present application, the isolation layer may be a SPL layer or a blue electron blocking layer.

[0085] It should be noted that both the SPL layer and the blue electron blocking layer can be used as isolation layers to prevent color crosstalk between adjacent light-emitting layers.

[0086] In some embodiments of the present application, the material of the SPL layer includes but is not limited to gallium oxide. Gallium oxide has an ultra-wide bandgap characteristic and can be used in ultra-high power components.

[0087] In some embodiments of the present application, the material of the blue electron blocking layer includes but is not limited to at least one of a cyclometalated iridium compound, gallium oxide, DPEPO, and TAPC.

[0088] In some embodiments of the present application, the positions of the first electron blocking layer and the second electron blocking layer relative to the isolation layer are not fixed. The first electron blocking layer can be on the side of the isolation layer away from the substrate or on the side of the isolation layer close to the substrate; the second electron blocking layer can be on the side of the isolation layer away from the substrate or on the side of the isolation layer close to the substrate.

[0089] In some embodiments of the present application, the first electron blocking layer can be arranged on the side of the isolation layer facing away from the first electrode, and the first electron blocking layer is arranged in contact with the first light-emitting layer; the second electron blocking layer is arranged on the side of the isolation layer close to the first electrode, and the second electron blocking layer is arranged in non-contact with the second light-emitting layer.

[0090] In some embodiments of the present application, the first electron blocking layer is arranged on a side of the isolation layer close to the first electrode, and the first electron blocking layer is arranged in non-contact with the first light-emitting layer; the second electron blocking layer is arranged on a side of the isolation layer away from the first electrode, and the second electron blocking layer is arranged in contact with the second light-emitting layer.

[0091] In some embodiments of the present application, each light emitting unit further includes:

[0092] A third light-emitting layer is disposed on the substrate and is disposed adjacent to the first light-emitting layer and / or the second light-emitting layer in the same layer;

[0093] A third electron blocking layer is disposed between the third light-emitting layer and the first electrode;

[0094] The third electron blocking layer and the isolation layer are made of the same layer and material.

[0095] In some embodiments of the present application, the third light-emitting layer includes a blue light-emitting layer, the third electron blocking layer includes a blue electron blocking layer, and the blue electron blocking layer and the isolation layer are in the same layer and made of the same material.

[0096] It should be noted that the blue electron blocking layer can be used as both a blue electron blocking layer and an isolation layer, and a structure with fewer film layers is used to effectively prevent crosstalk between red and green pixels.

[0097] See also Figure 2 and Figure 3 The light-emitting device includes a first electrode 200, a second electrode 400, and a light-emitting unit 300 arranged between the first electrode 200 and the second electrode 400. The light-emitting unit 300 includes a second electron blocking layer 304, an isolation layer 500, a first electron blocking layer 302, and a light-emitting layer which are sequentially stacked from the first electrode 200 to the second electrode 400. The light-emitting layer includes a first light-emitting layer 301 and a second light-emitting layer 303 which are arranged adjacent to each other in the same layer. The first electron blocking layer 302 is arranged in contact with the first light-emitting layer 301, and the second electron blocking layer 304 is arranged in non-contact with the second light-emitting layer 303. The isolation layer 500 is located between the first electron blocking layer 302 and the second electron blocking layer 304, and the orthographic projection of the isolation layer 500 on the first electrode 200 covers the orthographic projection of the first electron blocking layer 302 on the first electrode 200 and the orthographic projection of the second electron blocking layer 304 on the first electrode 200.

[0098] See also Figure 4 and Figure 5 The light-emitting device includes a first electrode 200, a second electrode 400, and a light-emitting unit 300 disposed between the first electrode 200 and the second electrode 400. The light-emitting unit 300 includes a second electron blocking layer 304, a third electron blocking layer 306, a first electron blocking layer 302, and a light-emitting layer stacked in sequence from the first electrode 200 to the second electrode 400. The light-emitting layer includes a first light-emitting layer 301, a second light-emitting layer 303, and a third light-emitting layer 305. The first light-emitting layer 301, the second light-emitting layer 303, and the third light-emitting layer 305 are in the same layer. They are arranged adjacent to each other, the first electron blocking layer 302 is arranged in contact with the first light-emitting layer 301, the second electron blocking layer 304 is arranged in non-contact with the second light-emitting layer 302, the third electron blocking layer 306 is located between the first electron blocking layer 302 and the second electron blocking layer 304, and the orthographic projection of the third electron blocking layer 306 on the first electrode 200 covers the orthographic projection of the first electron blocking layer 302 on the first electrode 200, the orthographic projection of the second electron blocking layer 304 on the first electrode 200, and the orthographic projection of the third light-emitting layer 305 on the first electrode 200.

[0099] The light-emitting unit may also be provided with some functional layers conventionally used in light-emitting devices to help improve the performance of the light-emitting devices, such as a hole injection layer, a hole transport layer, a hole blocking layer, an electron transport layer and an electron injection layer.

[0100] The material of the hole transport layer can be a material known in the art for the hole transport layer, for example, can be selected from but not limited to 4,4'-N,N'-dicarbazolyl-biphenyl (CBP), poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA), N,N'-diphenyl-N,N'-bis(1-naphthyl)-1,1'-biphenyl-4,4"-diamine (α-NPD), N,N'-diphenyl-N,N'-bis(3-methylphenyl)-(1,1'-biphenyl)-4,4'-diamine (TPD), poly(N,N'-bis(4-butylphenyl)-N,N'-bis(phenyl)benzidine) (Poly-TPD), N,N'-bis(3-butylphenyl)-N,N'-bis(phenyl)benzidine) (Poly-TPD). methylphenyl)-N,N'-bis(phenyl)-spiro(spiro-TPD), N,N'-bis(4-(N,N'-diphenyl-amino)phenyl)-N,N'-diphenylbenzidine (DNTPD), 4,4',4'-tri(N-carbazolyl)-triphenylamine (TCTA), 4,4',4'-tri(N-3-methylphenyl-N-phenylamino)triphenylamine (m-MTDATA), poly[(9,9'-dioctylfluorene-2,7-diyl)-co-(4,4'-(N-(4-sec-butylphenyl)diphenylamine))] (TFB), poly(N-vinylcarbazole) (PVK) and its derivatives, N,N'-di(1-naphthyl)-N,N'-diphenyl-1 ,1'-biphenyl-4-4'-diamine (NPB), spiro NPB, poly(phenylene vinylene) (PPV), poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylene vinylene] (MEH-PPV), poly[2-methoxy-5-(3',7'-dimethyloctyloxy)-1,4-phenylene vinylene] (MOMO-PPV), 2,2',7,7'-tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9'-spirobifluorene (spiro-omeTAD), 4,4'-cyclohexylbis[N,N-di(4-methylphenyl)aniline] (TAPC), 1,3-bis(carbazol-9-yl)benzene (MCP) , polyaniline, polypyrrole, poly(p-)phenylene vinylene, aromatic tertiary amine, polynuclear aromatic tertiary amine, 4,4'-bis(p-carbazolyl)-1,1'-biphenyl compound, N,N,N',N'-tetraarylbenzidine, PEDOT:PSS and its derivatives, polymethacrylate and its derivatives, poly(9,9-octylfluorene) and its derivatives, poly(spirofluorene) and its derivatives, doped graphene, undoped graphene, C60, doped or undoped NiO, doped or undoped MoO3, doped or undoped WO3, doped or undoped V2O5, doped or undoped P-type gallium nitride, doped or undoped CrO3, doped or undoped CuO. One or more.

[0101] The material of the hole injection layer can be a material known in the art for the hole injection layer, for example, it can be selected from but not limited to 2,3,6,7,10,11-hexacyano-1,4,5,8,9,12-hexaazatriphenylene (HAT-CN), PEDOT, PEDOT:PSS, a derivative of PEDOT:PSS doped with s-MoO3 (PEDOT:PSS:s-MoO3), 4,4',4'-tris(N-3-methylphenyl-N-phenylamino)triphenylamine (m-MTDATA), tetracyanoquinodimethane (F4-TCQN), copper phthalocyanine, nickel oxide, molybdenum oxide, tungsten oxide, vanadium oxide, molybdenum sulfide, tungsten sulfide and copper oxide. One or more.

[0102] The material of the electron transport layer is a material known in the art for the electron transport layer, for example, it can be selected from but not limited to one or more of inorganic electron transport materials and organic electron transport materials. Inorganic electron transport materials include but are not limited to doped metal oxide particles, undoped metal oxide particles, ceramic semiconductor materials, IIB-VIA semiconductor materials, IIIA-VA semiconductor materials and IB-IIIA-VIA semiconductor materials. The metal oxide in the undoped metal oxide particles includes but is not limited to one or more of ZnO, TiO2, SnO2, ZrO2, Ta2O5. The metal oxides in the doped metal oxides include but are not limited to one or more of ZnO, TiO2, SnO2, ZrO2, Ta2O5, and Al2O3. The doping elements in the doped metal oxides include but are not limited to one or more of Al, Mg, Li, Mn, Y, La, Cu, Ni, Zr, Ce, In, Ga, and Sn. For example, the doped metal oxides may be aluminum zinc oxide (AZO), lithium-doped zinc oxide (LZO), magnesium-doped zinc oxide (MZO), and tin-doped zinc oxide (Sn-ZnO). Ceramic semiconductor materials include but are not limited to barium titanate. IIB-VIA semiconductor materials include but are not limited to one or more of ZnS, ZnSe, and CdS. IIIA-VA semiconductor materials include but are not limited to one or more of InP and GaP. IB-IIIA-VIA semiconductor materials include but are not limited to one or more of CuInS and CuGaS.

[0103] The organic electron transport material includes, but is not limited to, one or more of quinoxaline compounds, imidazole compounds, triazine compounds, fluorene-containing compounds, and hydroxyquinoline compounds.

[0104] The metal oxide particles include, but are not limited to, one or more of doped metal oxide particles and undoped metal oxide particles. The material of the undoped metal oxide particles includes, but is not limited to, one or more of ZnO, TiO2, SnO2, ZrO2, and Ta2O5. The metal oxide in the doped metal oxide particles includes, but is not limited to, one or more of ZnO, TiO2, SnO2, ZrO2, Ta2O5, and Al2O3, and the doping elements in the doped metal oxide particles include, but are not limited to, one or more of Al, Mg, Li, Mn, Y, La, Cu, Ni, Zr, Ce, In, and Ga. As an example, the material of the doped metal oxide particles can be aluminum zinc oxide (AZO), lithium-doped zinc oxide (LZO), and magnesium-doped zinc oxide (MZO).

[0105] It can be understood that the materials of each layer of the light-emitting device can be adjusted according to the light-emitting requirements of the light-emitting device.

[0106] refer to Figure 6 The light-emitting unit 300 may further include a first electrode 200, a second electrode 400, and a light-emitting unit 300 disposed between the first electrode 200 and the second electrode 400, wherein the light-emitting unit 300 includes a hole injection layer 307, a hole transport layer 308, a second electron blocking layer 304, a third electron blocking layer 306, a first electron blocking layer 302, a light-emitting layer, a hole blocking layer 309, an electron transport layer 310, and an electron injection layer 311, which are sequentially stacked from the first electrode 200 to the second electrode 400, wherein the light-emitting layer includes The first light-emitting layer 301, the second light-emitting layer 303 and the third light-emitting layer 305 are arranged adjacent to each other in the same layer, the first electron blocking layer 302 is arranged corresponding to the first light-emitting layer 301, the second electron blocking layer 304 is arranged corresponding to the second light-emitting layer 303, and the orthographic projection of the third electron blocking layer 306 on the first electrode 200 covers the orthographic projection of the first electron blocking layer 302 on the first electrode 200, covers the orthographic projection of the second electron blocking layer 304 on the first electrode 200, and covers the orthographic projection of the third light-emitting layer 305 on the first electrode 200.

[0107] In some embodiments of the present application, the light-emitting unit includes two stacked light-emitting units, and each light-emitting unit includes an isolation layer.

[0108] In some embodiments of the present application, a charge generation layer is further included, and the charge generation layer is arranged between two adjacent light-emitting units.

[0109] See also Figure 7 and Figure 8The light-emitting device includes a first electrode 200, a second electrode 400, and two groups of stacked light-emitting units 300 disposed between the first electrode 200 and the second electrode 400, and the two adjacent groups of light-emitting units 300 are connected by a charge generation layer 312. The light-emitting unit 300 includes at least a light-emitting layer and an electron blocking layer, the light-emitting layer includes a first light-emitting layer 301 and a second light-emitting layer 303, the electron blocking layer includes a first electron blocking layer 302 and a second electron blocking layer 304, the first light-emitting layer 301 is opposite to the first electron blocking layer 302, and the second light-emitting layer 303 is opposite to the second electron blocking layer 304. Among them, at least one light-emitting unit 300 also includes an isolation layer 500, the isolation layer 500 is located between the first electron blocking layer 302 and the second electron blocking layer 304, and the orthographic projection of the isolation layer 500 on the first electrode 200 covers the orthographic projection of the first electron blocking layer 302 on the first electrode 200 and covers the orthographic projection of the second electron blocking layer 304 on the first electrode 200. Figure 7 and Figure 8 The difference is that the first electron blocking layer 302 may or may not be in contact with the first light-emitting layer 301 , and the second electron blocking layer 304 may or may not be in contact with the second light-emitting layer 303 .

[0110] See also Fig. 9 The light-emitting device includes a first electrode 200, a second electrode 400, and two groups of stacked light-emitting units 300 disposed between the first electrode 200 and the second electrode 400, and the two adjacent groups of light-emitting units 300 are connected through a charge generation layer 312. The light-emitting unit 300 includes a light-emitting layer, an electron blocking layer and an isolation layer 500. The light-emitting layer includes a first light-emitting layer 301 and a second light-emitting layer 303. The electron blocking layer includes a first electron blocking layer 302 and a second electron blocking layer 304. The first light-emitting layer 301 is opposite to the first electron blocking layer 302, and the second light-emitting layer 303 is opposite to the second electron blocking layer 304. Among them, at least one light-emitting unit 300 also includes an isolation layer 500, and the isolation layer 500 is located between the first electron blocking layer 302 and the second electron blocking layer 304. The first electron blocking layer 302 may be in contact with or not in contact with the first light-emitting layer 301, and the second electron blocking layer 304 may be in contact with or not in contact with the second light-emitting layer 303.

[0111] In some embodiments of the present application, the thickness of the isolation layer is less than or equal to 20 nm.

[0112] In some embodiments of the present application, the thickness of the isolation layer is less than or equal to 10 nm.

[0113] It should be noted that for materials with low lateral current, such as EBL_B, which has large resistance, the greater the thickness, the higher the voltage of the light-emitting device will be, resulting in a loss of device performance, so the thickness should not be too large.

[0114] In some embodiments of the present application, the isolation layer includes a first isolation layer and a second isolation layer, and the first isolation layer and the second isolation layer are arranged on the same layer; the lateral conductivity of the first isolation layer is less than or greater than the lateral conductivity of the second isolation layer.

[0115] In some embodiments of the present application, the isolation layer includes a first isolation layer and a second isolation layer, the first isolation layer has a lateral conductivity that is smaller than or greater than that of the second isolation layer, and the first isolation layer and the second isolation layer are not in the same layer or made of the same material.

[0116] In a second aspect, a display panel is provided, comprising the aforementioned organic electroluminescent device.

[0117] The present application is described in detail below by means of specific examples, which are only partial examples of the present application and are not intended to limit the present application. The raw materials used in the following examples are all commercially available products unless otherwise specified.

[0118] Example 1

[0119] A light-emitting device comprises a first electrode and a second electrode and a light-emitting unit arranged between the first electrode and the second electrode; the light-emitting unit comprises a hole injection layer HIL, a hole transport layer HTL, an electron blocking layer EBL, a light-emitting layer EML, a hole blocking layer HBL, an electron transport layer ETL, and an electron injection layer Yb, which are sequentially stacked; wherein the light-emitting layer comprises a red light-emitting layer EML_R, a green light-emitting layer EML_G, and a blue light-emitting layer EML_B, and the red light-emitting layer, the green light-emitting layer, and the blue light-emitting layer are sequentially arranged in the same layer; the electron blocking layer comprises a red electron blocking layer EBL_R, a green electron blocking layer EBL_G, and a blue electron blocking layer EBL_B, and the red electron blocking layer, the green electron blocking layer, and the blue electron blocking layer are sequentially arranged in the same layer; the first electrode is an ITO anode, and the second electrode is a Mg:Ag alloy electrode.

[0120] There is an isolation layer SPL between the hole transport layer HTL and the red electron blocking layer EBL_R, and there is an isolation layer SPL between the green electron blocking layer EBL_G and the green light-emitting layer EML_G. The two isolation layers SPL are the same film layer and are connected.

[0121] The film structure of the light-emitting pixel of the light-emitting device is shown in Table 1.

[0122] Table 1

[0123] Film structure of light-emitting device: R luminous pixel ITO / HIL / HTL / SPL / EBL_R / EML_R / HBL / ETL / Yb / Mg:Ag G luminous pixel ITO / HIL / HTL / EBL_G / SPL / EML_G / HBL / ETL / Yb / Mg:Ag B luminous pixel ITO / HIL / HTL / EBL_B / EML_B / HBL / ETL / Yb / Mg:Ag

[0124] Example 2

[0125] A light-emitting device comprises a first electrode and a second electrode and a light-emitting unit arranged between the first electrode and the second electrode; the light-emitting unit comprises a hole injection layer HIL, a hole transport layer HTL, an electron blocking layer EBL, a light-emitting layer EML, a hole blocking layer HBL, an electron transport layer ETL, and an electron injection layer Yb, which are stacked in sequence; wherein the light-emitting layer comprises a red light-emitting layer EML_R, a green light-emitting layer EML_G, and a blue light-emitting layer EML_B, and the red light-emitting layer EML_R, the green light-emitting layer EML_G, and the blue light-emitting layer EML_B are arranged in the same layer in sequence; the electron blocking layer comprises a red electron blocking layer EBL_R, a green electron blocking layer EBL_G, and a blue electron blocking layer EBL_B, the red electron blocking layer EBL_R is arranged in direct contact with the red light-emitting layer EML_R, the green electron blocking layer EBL_G is arranged in non-contact with the green light-emitting layer EML_G, and EBL_B is used as an isolation layer and is connected in red pixels, green pixels, and blue pixels; the first electrode is an ITO anode, and the second electrode is a Mg:Ag alloy electrode.

[0126] The film structure of the light-emitting pixel of the light-emitting device is shown in Table 2.

[0127] Table 2

[0128]

[0129]

[0130] Example 3

[0131] A light-emitting device comprises a first electrode and a second electrode and a light-emitting unit group arranged between the first electrode and the second electrode, wherein the light-emitting unit group comprises two stacked light-emitting units, the two light-emitting units are connected through a charge generation layer CGL, and each light-emitting unit comprises a hole injection layer HIL, a hole transport layer HTL, an electron blocking layer EBL, a light-emitting layer EML, a hole blocking layer HBL, an electron transport layer ETL, and an electron injection layer Yb which are stacked in sequence; wherein the light-emitting layer comprises a red light-emitting layer EML_R, a green light-emitting layer EML_G, and a blue light-emitting layer EML_B, and the red light-emitting layer The red electron blocking layer EBL_R, the green electron blocking layer EBL_G and the blue electron blocking layer EBL_B are arranged in the same layer in sequence; the electron blocking layer includes a red electron blocking layer EBL_R, a green electron blocking layer EBL_G and a blue electron blocking layer EBL_B, the red electron blocking layer EBL_R is arranged in direct contact with the red light-emitting layer EML_R, the green electron blocking layer EBL_G is arranged in non-contact with the green light-emitting layer EML_G, and EBL_B serves as an isolation layer and is connected in the red pixel, the green pixel and the blue pixel; the first electrode is an ITO anode, and the second electrode is a Mg:Ag alloy electrode.

[0132] The film structure of the light-emitting pixel of the light-emitting device is shown in Table 3.

[0133] Table 3

[0134]

[0135] Comparative Example 1

[0136] A light-emitting device comprises a first electrode, a second electrode and a light-emitting unit arranged between the first electrode and the second electrode; the light-emitting unit comprises a hole injection layer HIL, a hole transport layer HTL, an electron blocking layer EBL, a light-emitting layer EML, a hole blocking layer HBL, an electron transport layer ETL and an electron injection layer Yb which are sequentially stacked from the first electrode to the second electrode; wherein the light-emitting layer comprises a red light-emitting layer EML_R, a green light-emitting layer EML_G and a blue light-emitting layer EML_B, and the red light-emitting layer, the green light-emitting layer and the blue light-emitting layer are sequentially arranged in the same layer; the electron blocking layer comprises a red electron blocking layer EBL_R, a green electron blocking layer EBL_G and a blue electron blocking layer EBL_B, and the red electron blocking layer, the green electron blocking layer and the blue electron blocking layer are sequentially arranged in the same layer; the first electrode is an ITO anode, and the second electrode is a Mg:Ag alloy electrode.

[0137] The film structure of the light-emitting pixel of the light-emitting device is shown in Table 4.

[0138] Table 4

[0139] Film structure of light-emitting device: R luminous pixel ITO / HIL / HTL / EBL_R / EML_R / HBL / ETL / Yb / Mg:Ag G luminous pixel ITO / HIL / HTL / EBL_G / EML_G / HBL / ETL / Yb / Mg:Ag B luminous pixel ITO / HIL / HTL / EBL_B / EML_B / HBL / ETL / Yb / Mg:Ag

[0140] Comparative Example 2

[0141] A light-emitting device comprises a first electrode, a second electrode and a light-emitting unit group arranged between the first electrode and the second electrode; the light-emitting unit group comprises two stacked light-emitting units, the two light-emitting units are connected via a charge generation layer CGL, each light-emitting unit comprises a hole injection layer HIL, a hole transport layer HTL, an electron blocking layer EBL, a light-emitting layer EML, a hole blocking layer HBL, an electron transport layer ETL, and an electron injection layer Yb which are sequentially stacked from the first electrode to the second electrode; wherein the light-emitting layer comprises a red light-emitting layer EML_R, a green light-emitting layer EML_G and a blue light-emitting layer EML_B, and the red light-emitting layer, the green light-emitting layer and the blue light-emitting layer are sequentially arranged in the same layer; the electron blocking layer comprises a red electron blocking layer EBL_R, a green electron blocking layer EBL_G and a blue electron blocking layer EBL_B, and the red electron blocking layer, the green electron blocking layer and the blue electron blocking layer are sequentially arranged in the same layer; the first electrode is an ITO anode, and the second electrode is a Mg:Ag alloy electrode.

[0142] The film structure of the light-emitting pixel of the light-emitting device is shown in Table 5.

[0143] Table 5

[0144]

[0145]

[0146] NTSC color gamut difference detection:

[0147] For the samples of Examples 1-3 and Comparative Examples 1-2, the NTSC color gamut difference between 255 grayscale white and 8 grayscale white at 500 nit brightness was tested and compared, and the test data is shown in Table 6.

[0148] Table 6

[0149]

[0150] From Examples 1-2, Comparative Example 1 and Table 6, it can be seen that for a single-layer light-emitting device, the devices of Examples 1-2 have a lower L255-L8NTSC color gamut difference than Comparative Example 1, indicating that the luminous color is more stable under high brightness and low brightness, and the leakage degree between red and green pixels is improved.

[0151] Similarly, for the double-layer light-emitting device, compared with Example 2, the NTSC color gamut difference under high and low brightness is smaller in Example 3, indicating that the luminous color is more stable under high and low brightness, and the leakage degree between red and green pixels is improved.

[0152] The organic electroluminescent device and display panel provided in the embodiments of the present application are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for technicians in this field, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. An organic electroluminescent device, characterized in that: include: substrate; A first electrode is disposed on one side of the substrate; at least one light-emitting unit, disposed on a side of the first electrode facing away from the substrate; A second electrode is disposed on a side of the light-emitting unit away from the first electrode; Each of the light emitting units comprises: A first light-emitting layer is disposed on a side of the first electrode away from the substrate; A first electron blocking layer is disposed between the first electrode and the first light-emitting layer; A second light-emitting layer is disposed on a side of the first electrode away from the substrate and is disposed adjacent to the first light-emitting layer in the same layer; A second electron blocking layer is disposed between the first electrode and the second light-emitting layer; At least one of the light emitting units further comprises: an isolation layer, disposed between the first electron blocking layer and the second electron blocking layer, wherein the orthographic projection of the isolation layer on the substrate covers the orthographic projection of the first electron blocking layer on the substrate, and covers the orthographic projection of the second electron blocking layer on the substrate; The lateral conductivity of the isolation layer is lower than the lateral conductivity of the first electron blocking layer and the second electron blocking layer.

2. The organic electroluminescent device according to claim 1, characterized in that: The first electron blocking layer is arranged on the side of the isolation layer away from the first electrode, and the first electron blocking layer is arranged in contact with the first light-emitting layer; the second electron blocking layer is arranged on the side of the isolation layer close to the first electrode, and the second electron blocking layer is arranged in non-contact with the second light-emitting layer.

3. The organic electroluminescent device according to claim 1, characterized in that: The first electron blocking layer is arranged on a side of the isolation layer close to the first electrode, and the first electron blocking layer is arranged in non-contact with the first light-emitting layer; the second electron blocking layer is arranged on a side of the isolation layer away from the first electrode, and the second electron blocking layer is arranged in contact with the second light-emitting layer.

4. The organic electroluminescent device according to claim 1, characterized in that: The first light-emitting layer includes a red light-emitting layer, and the second light-emitting layer includes a green light-emitting layer.

5. The organic electroluminescent device according to claim 4, characterized in that: The first electron blocking layer includes a red electron blocking layer, and the second electron blocking layer includes a green electron blocking layer.

6. The organic electroluminescent device according to claim 1, characterized in that: Each of the light emitting units further comprises: A third light-emitting layer is disposed on the substrate and is disposed adjacent to the first light-emitting layer and / or the second light-emitting layer in the same layer; A third electron blocking layer is disposed between the third light-emitting layer and the first electrode; Wherein, the third electron blocking layer and the isolation layer are in the same layer and made of the same material.

7. The organic electroluminescent device according to claim 6, characterized in that: The third light-emitting layer includes a blue light-emitting layer, the third electron blocking layer includes a blue electron blocking layer, and the blue electron blocking layer and the isolation layer are in the same layer and made of the same material.

8. The organic electroluminescent device according to claim 1, characterized in that: The light-emitting unit includes two stacked light-emitting units, and each of the light-emitting units includes an isolation layer.

9. The organic electroluminescent device according to claim 1, characterized in that: It also includes a charge generation layer, which is arranged between two adjacent light-emitting units.

10. The organic electroluminescent device according to claim 1, characterized in that: The thickness of the isolation layer is less than or equal to 20 nm.

11. The organic electroluminescent device according to claim 1, characterized in that: The thickness of the isolation layer is less than or equal to 10 nm.

12. The organic electroluminescent device according to claim 1, characterized in that: The isolation layer includes a first isolation layer and a second isolation layer, wherein the first isolation layer and the second isolation layer are arranged on the same layer; and the transverse conductivity of the first isolation layer is less than or greater than the transverse conductivity of the second isolation layer.

13. The organic electroluminescent device according to claim 1, characterized in that: The isolation layer includes a first isolation layer and a second isolation layer. The first isolation layer has a lateral conductivity that is smaller than or greater than that of the second isolation layer. The first isolation layer and the second isolation layer are not arranged in the same layer.

14. A display panel, characterized in that An organic electroluminescent device comprising any one of claims 1 to 13.

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