CN112640145A - Organic light emitting diode device, preparation method thereof, display panel and display device - Google Patents
Organic light emitting diode device, preparation method thereof, display panel and display device Download PDFInfo
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- CN112640145A CN112640145A CN201880095898.1A CN201880095898A CN112640145A CN 112640145 A CN112640145 A CN 112640145A CN 201880095898 A CN201880095898 A CN 201880095898A CN 112640145 A CN112640145 A CN 112640145A
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- YVTHLONGBIQYBO-UHFFFAOYSA-N zinc indium(3+) oxygen(2-) Chemical compound [O--].[Zn++].[In+3] YVTHLONGBIQYBO-UHFFFAOYSA-N 0.000 description 1
- TYHJXGDMRRJCRY-UHFFFAOYSA-N zinc indium(3+) oxygen(2-) tin(4+) Chemical compound [O-2].[Zn+2].[Sn+4].[In+3] TYHJXGDMRRJCRY-UHFFFAOYSA-N 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/40—Thermal treatment, e.g. annealing in the presence of a solvent vapour
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Abstract
The embodiment of the application relates to the technical field of display, and provides an organic light-emitting diode device, a preparation method thereof, a display panel (40) and a display device (200), wherein the organic light-emitting diode device comprises: the organic light emitting diode comprises a cathode (11), an anode (13) and an organic light emitting layer (12), wherein the organic light emitting layer (12) comprises an organic light emitting unit (122), the organic light emitting unit (122) comprises a plurality of organic light emitting molecules (1224) with magnetic anisotropy, and each organic light emitting molecule (1224) is arranged in parallel on a light emitting surface (1222) of the organic light emitting unit (122); by making the organic light emitting molecules (1224) parallel to the light emitting surface (1222) of the organic light emitting unit (122), light extraction is facilitated, and the current efficiency of the organic light emitting diode device is improved.
Description
The embodiment of the application relates to the technical field of display, in particular to an organic light emitting diode device, a preparation method thereof, a display panel and a display device.
The Organic Light-Emitting Diode (OLED) display technology has the characteristics of active Light emission, low-voltage driving, high brightness, full color and the like, and by virtue of various advantages, the OLED display technology is widely applied to the fields of mobile phones, computers, televisions and the like.
However, the organic light emitting diode prepared by the evaporation process generally does not undergo additional post-treatment after the evaporation process is completed, and even if the organic light emitting diode prepared by the thermal annealing process is subjected to post-treatment, due to limited energy provided by the thermal annealing process, the re-orientation of light emitting molecules cannot be obviously acted, so that the light emitting molecules in the organic light emitting layer of the organic light emitting diode prepared by the evaporation process tend to be randomly arranged, light extraction is not facilitated, and the current efficiency of the organic light emitting diode is low.
Disclosure of Invention
The embodiment of the application aims to provide an organic light-emitting diode device, a preparation method thereof, a display panel and a display device, so as to solve the technical problem that the current efficiency of the organic light-emitting diode device is not high in the prior art.
The embodiment of the application solves the technical problem and provides the following technical scheme:
an organic light emitting diode device comprising:
an anode;
a cathode;
the organic light-emitting layer is laminated between the anode and the cathode and comprises at least one organic light-emitting unit, each organic light-emitting unit comprises a plurality of organic light-emitting molecules with magnetic anisotropy, and the organic light-emitting molecules are parallel to the light-emitting surface of the organic light-emitting unit.
Optionally, the organic light emitting layer includes a red light emitting unit, a green light emitting unit, and a blue light emitting unit, and the red light emitting unit, the green light emitting unit, and the blue light emitting unit are arranged in the organic light emitting layer.
Optionally, the red light emitting unit includes a plurality of red light emitting molecules with magnetic anisotropy, and each of the red light emitting molecules is parallel to the light emitting surface of the red light emitting unit;
the green light emitting unit comprises a plurality of green light emitting molecules with magnetic anisotropy, and each green light emitting molecule is parallel to a light emitting surface of the green light emitting unit;
the blue light emitting unit comprises a plurality of blue light emitting molecules with magnetic anisotropy, and each blue light emitting molecule is parallel to the light emitting surface of the blue light emitting unit.
Optionally, each of the red light-emitting molecules, each of the green light-emitting molecules, and each of the blue light-emitting molecules are in a chain shape.
Optionally, every two red light-emitting molecules are arranged in a grid shape;
every two green light emitting molecules are mutually arranged in a grid shape;
every two blue light-emitting molecules are mutually arranged in a grid shape.
Optionally, every two red light-emitting molecules are crossed with each other, and a plurality of red light-emitting molecules jointly form a net structure;
every two green light emitting molecules are mutually crossed, and a plurality of green light emitting molecules jointly form a net structure;
every two blue light-emitting molecules are mutually crossed, and a plurality of blue light-emitting molecules jointly form a net structure.
Optionally, the organic light emitting diode device further comprises at least one electron blocking unit stacked between the organic light emitting unit and the anode.
Optionally, the electronic blocking unit includes a red light blocking unit, a green light blocking unit, and a blue light blocking unit;
the red light blocking unit is arranged opposite to the red light emitting unit;
the green light blocking unit is opposite to the green light emitting unit;
the blue light blocking unit is opposite to the blue light emitting unit.
Optionally, each of the organic light emitting molecules contains a plurality of benzene ring structures.
Optionally, the organic light emitting diode device further comprises an electron transport layer and a hole transport layer;
the electron transport layer is stacked between the cathode and the organic light emitting layer and is used for transporting electrons to the organic light emitting unit;
the hole transport layer is stacked between the anode and the organic light emitting layer, and is used for transporting holes to the organic light emitting unit.
Optionally, the organic light emitting diode further comprises a hole injection layer laminated between the hole transport layer and the anode.
Optionally, the organic light emitting diode further comprises an electron injection layer laminated between the electron transport layer and the cathode.
The embodiment of the application also provides the following technical scheme for solving the technical problems:
a method of fabricating an organic light emitting diode device, comprising: providing an organic light-emitting prefabricated layer, wherein the organic light-emitting prefabricated layer comprises at least one organic light-emitting unit, each organic light-emitting unit comprises a plurality of organic light-emitting molecules with magnetic anisotropy, and the organic light-emitting molecules are randomly arranged;
forming a cathode and an anode on two opposite surfaces of the organic light-emitting prefabricated layer respectively;
annealing the organic light-emitting prefabricated layer, the cathode and the anode;
and placing the organic light-emitting prefabricated layer, the cathode and the anode in a magnetic field to enable the organic light-emitting molecules to be parallel to the light-emitting surface of the organic light-emitting unit, thereby obtaining the organic light-emitting diode device.
Optionally, the organic light emitting prefabricated layer includes a red light emitting unit, a green light emitting unit, and a blue light emitting unit.
Optionally, the red light emitting unit comprises a plurality of red light emitting molecules having magnetic anisotropy;
the green light emitting unit includes a plurality of green light emitting molecules having magnetic anisotropy;
the blue light emitting unit includes a plurality of blue light emitting molecules having magnetic anisotropy.
Optionally, the method further comprises forming an electron blocking unit between the organic light emitting unit and the anode.
Optionally, the electronic blocking unit includes a red light blocking unit, a green light blocking unit, and a blue light blocking unit;
the red light blocking unit is arranged opposite to the red light emitting unit;
the green light blocking unit is opposite to the green light emitting unit;
the blue light blocking unit is opposite to the blue light emitting unit.
Optionally, each of the organic light emitting molecules contains a plurality of benzene ring structures.
Optionally, the method further comprises forming an electron transport layer between the cathode and the organic light emitting layer;
a hole transport layer is formed between the anode and the organic light emitting layer.
Optionally, the method further comprises forming a hole injection layer between the hole transport layer and the anode.
Optionally, the method further comprises forming an electron injection layer between the electron transport layer and the cathode.
Alternatively,
the embodiment of the application also provides the following technical scheme for solving the technical problems:
a display panel, comprising: the display unit and the organic light emitting diode device described above,
the embodiment of the application also provides the following technical scheme for solving the technical problems:
a display device, comprising:
a substrate;
a driving layer disposed on the substrate; and
the display panel is disposed on the driving layer, and the driving layer is used for driving the display panel.
Compared with the prior art, the organic light emitting diode device provided in the embodiment of the application changes the random arrangement of the original organic light emitting molecules by enabling the organic light emitting molecules in the organic light emitting layer to be parallel to the light emitting surface of the organic light emitting unit, thereby being beneficial to taking out light, improving the current efficiency of the organic light emitting diode, and simultaneously prolonging the service life of the organic light emitting diode under the same light emitting intensity.
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the structures shown in the drawings without inventive labor.
Fig. 1 is a schematic structural diagram of an organic light emitting diode device according to an embodiment of the present disclosure;
fig. 2 is a schematic structural view of an organic light emitting unit of the organic light emitting diode device in fig. 1;
fig. 3-5 are schematic structural diagrams of organic light emitting diode devices according to various some embodiments;
fig. 6 is a flowchart of a method for manufacturing an organic light emitting diode device according to another embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of a display device according to yet another embodiment of the present application.
In order to facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and specific embodiments. It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical", "horizontal", "left", "right", "inside", "outside" and the like used in the present specification are for illustrative purposes only and express only a substantial positional relationship, for example, with respect to "vertical", if a positional relationship is not strictly vertical for the purpose of achieving a certain object, but is substantially vertical, or utilizes the property of being vertical, it belongs to the category of "vertical" described in the present specification.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In addition, the technical features mentioned in the different embodiments of the present application described below may be combined with each other as long as they do not conflict with each other.
Referring to fig. 1 and fig. 2 together, an organic light emitting diode device 100 according to an embodiment of the present disclosure includes: a cathode 11, an anode 13, and an organic light-emitting layer 12; the anode 13 releases holes under the external voltage. The cathode 11 releases electrons under the action of an external voltage. The organic light emitting layer 12 is stacked between the anode 13 and the cathode 11, the organic light emitting layer 12 includes at least one organic light emitting unit 122, each of the organic light emitting units 122 includes a plurality of organic light emitting molecules 1224 having magnetic anisotropy, and the organic light emitting molecules 1224 are parallel to a light emitting surface 1222 of the organic light emitting unit 122.
In the organic light emitting diode device 100 of the present embodiment, the organic light emitting molecules 1224 in the organic light emitting layer 12 are parallel to the light emitting surface 1224 of the organic light emitting unit 122, so that the random arrangement of the original organic light emitting molecules is changed, which is beneficial to light extraction, and the current efficiency of the organic light emitting diode device 100 is improved, and the service life of the organic light emitting diode device 100 is also prolonged under the same light emitting intensity.
The cathode 11 may be a transmissive electrode or a transflective electrode. In some embodiments, the cathode 11 may be a transmissive electrode having a multi-layer structure.
The anode 13 includes a flexible substrate, a conductive metal wire layer, and a conductive thin film, the conductive metal wire layer being disposed between the flexible substrate and the conductive thin film.
The flexible substrate is made of a material with visible light transmittance of more than 80%, and can be made of terephthalic acid, polyethylene glycol (PET), polyether sulfone (PES), polyethylene naphthalate (PEN), Cyclic Olefin Copolymer (COC) or transparent Polyimide (PI). The flexible substrate may have a thickness of 0.1mm to 0.5 mm.
The conductive film can be made of poly (3, 4-ethylenedioxythiophene)/poly (p-styrenesulfonic acid) (PEDOT: PSS), and the mass ratio of PSS to PEDOT can be 1: 20. the thickness of the conductive film may be 15 μm to 1100 μm.
The conductive metal wire layer comprises a plurality of conductive metal wires, and the plurality of conductive metal wires are arranged on the flexible substrate. In some embodiments, a plurality of the conductive metal lines may also be arranged in a grid.
The diameter of each conductive metal wire is 10-1000 microns, the distance between every two adjacent conductive metal wires is 0.2-10 mm, and the conductive metal wires can be made of gold, silver, aluminum, copper or nickel. The anode 13 is provided with the conductive metal wire layer between the flexible substrate and the conductive film, and the conductive metal wires of the conductive metal wire layer are covered and wrapped by the conductive film to form an internal conductive network, so that the surface resistance is reduced, and the conductive capability of the anode 13 is improved.
In some embodiments, the anode 13 may be a transmissive electrode or a transflective electrode.
In some embodiments, the anode 13 may be a reflective electrode for front surface emission. The anode 13 may have a single-layer structure or a multi-layer structure. The single layer anode may include a metal layer having Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, or a mixture thereof. The multilayer anode includes a metal layer having Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, or a mixture thereof and a transparent conductive oxide layer including a transparent conductive oxide material. The transparent conductive oxide material may include Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), zinc oxide (ZnO), Indium Tin Zinc Oxide (ITZO), and the like. The multilayer anode may have a three-layer structure configured to include a first transparent conductive oxide layer, a metal layer, and a second transparent conductive oxide layer. The multi-layered anode may also have a two-layer structure configured to include a transparent conductive oxide layer and a metal layer. The metal layer may serve as a reflective electrode.
The organic light emitting layer 12 includes at least one organic light emitting unit 122 and at least one electron blocking unit 124, and the electron blocking unit 124 is stacked between the organic light emitting unit 122 and the anode 13 for blocking electrons from being transmitted from the organic light emitting unit 122 to the hole transport layer 16.
The organic light emitting unit 122 is used for emitting light, wherein the color of the light emission may be white light, or may be a color composed of any color proportion.
The organic light emitting unit 122 is prepared by doping a certain proportion of organic light emitting material in a host material. The organic light emitting material has high quantum efficiency and sufficient thermal stability, and sublimes without decomposition. When the electrons and the holes meet in the organic light emitting unit, the electrons are continuously filled from the high orbit into the holes of the low orbit, thereby releasing energy.
The organic light-emitting material is a polymer-based OLED which takes conjugated polymer as a light-emitting material and can adopt a spin coating or ink-jet process.
When an external voltage is applied to the organic light emitting diode device 100, electrons injected into the organic light emitting unit 122 from the cathode 11 and holes injected into the organic light emitting unit 122 from the anode 13 meet and recombine in the organic light emitting unit 122 to form excitons in an excited state, the excitons transfer energy to light emitting molecules under the action of an electric field, the electrons exciting the light emitting molecules transition from a ground state to an excited state, and the electrons of the light emitting molecules release energy mainly in the form of light and return to a stable ground state, thereby generating electroluminescence.
The electron blocking unit 124 can block electrons from moving toward the anode 13, so that the electrons stay in the organic light emitting unit 122 to sufficiently meet and recombine with holes, thereby improving the light emitting efficiency and the service life of the organic light emitting diode device 100.
In some embodiments, the organic light emitting diode device 100 further comprises an electron transport layer 14 and a hole transport layer 16. The electron transport layer 14 is stacked between the cathode 11 and the organic light emitting layer 12, and transports electrons to the organic light emitting unit 122; the hole transport layer 16 is stacked between the anode 13 and the organic light emitting layer 12, and transports holes to the organic light emitting unit 122.
The electron transport layer 14 can effectively inject electrons of the cathode 11 into the organic light emitting layer 12, so that the electrons are recombined with holes in the organic light emitting layer 12, thereby improving the performance of the organic light emitting diode device 100.
The electron transport layer 14 includes, for example, Alq3 (tris (8-hydroxyquinoline) aluminum), TPBi (1,3, 5-tris (1-phenyl-1H-benzo [ d ] imidazol-2-yl) phenyl), BCP (2, 9-dimethyl-4, 7-diphenyl-1, 10-phenanthroline), Bphen (4, 7-diphenyl-1, 10-phenanthroline), TAZ (3- (4-biphenyl) -4-phenyl-5-tert-butylphenyl-1, 2, 4-triazole), NTAZ (4- (naphthalen-1-yl) -3, 5-diphenyl-4H-1, 2, 4-triazole), tBu-PBD (2- (4-biphenyl) -5- (4-tert-butylphenyl) -1,3, 4-oxadiazole), BAlq (bis (2-methyl-8-quinolinol-N1, O8) - (1,1' -biphenyl-4-hydroxy) aluminum), Bebq2 (beryllium bis (benzoquinoline-10-oic acid)), AND (9, 10-bis (naphthalen-2-yl) anthracene), or a mixture thereof.
The hole transport layer 16 can effectively inject holes of the anode 13 into the organic light emitting layer 12, so that the holes are recombined with electrons in the organic light emitting layer 12, thereby improving the performance of the organic light emitting diode device 100.
The hole transport layer 16 may include carbazole-based derivatives such as N-phenylcarbazole, polyvinylcarbazole, etc., fluorine-based derivatives, triphenylamine-based derivatives such as TPD (N, N ' -bis (3-methylphenyl) -N, N ' -diphenyl- [1, 1-biphenyl ] -4,4' -diamine), TCTA (4,4',4 ″ -tris (N-carbazolyl) triphenylamine), etc., NPB (N, N ' -bis (1-naphthyl) -N, N ' -diphenyl benzidine), TAPC (4,4' -cyclohexylidenebis [ N, N-bis (4-methylphenyl) aniline ]), and the like.
Referring to fig. 3, an organic light emitting diode device 100a according to some embodiments of the present disclosure is substantially the same as the organic light emitting diode device 100 shown in fig. 1, except that the organic light emitting layer 12 is an RGB light emitting layer, and includes a red light emitting unit 122a, a green light emitting unit 122b, and a blue light emitting unit 122c, and the red light emitting unit 122a, the green light emitting unit 122b, and the blue light emitting unit 122c are arranged in the organic light emitting layer 12; the electron blocking unit 124 includes a red electron blocking unit 124a, a green electron blocking unit 124b, and a blue electron blocking unit 124c, the red electron blocking unit 124a is disposed opposite to the red light emitting unit 122a, the green electron blocking unit 124b is disposed opposite to the green light emitting unit 122b, and the blue electron blocking unit 124c is disposed opposite to the blue light emitting unit 122 c.
The red light emitting unit 122a includes a plurality of red light emitting molecules having magnetic anisotropy, and the red light emitting molecules are parallel to the light emitting surface of the red light emitting unit 122 a. Each red light-emitting molecule is in a chain shape, every two red light-emitting molecules can be mutually arranged in a grid shape, or every two red light-emitting molecules can be mutually crossed, and a plurality of red light-emitting molecules jointly form a net structure.
Each red light-emitting molecule is an organic light-emitting molecule containing a plurality of benzene ring structures, and the organic light-emitting molecules can adopt PBD Eu (DBM)3(Phen) (tris (dibenzoylmethane) phenanthroline europium) or perylene fluorescent materials. The dopant of the red light emitting unit 122a may be selected from metal complexes, for example, organic metal complexes such as piqir (acac) (bis (1-phenylisoquinoline) acetylacetonatoiridium), PQIr (acac) (bis (1-phenylquinoline) acetylacetonatoiridium), PQIr (tris (1-phenylquinoline) iridium), PtOEP (octaethylporphyrin platinum), and the like. In some embodiments, the red light-emitting unit 122a may include a phosphorescent material, such as Btp2Ir (acac).
The green light emitting unit 122b includes a plurality of green light emitting molecules having magnetic anisotropy, and the green light emitting molecules are parallel to the light emitting surface of the green light emitting unit 122 b. Each green light emitting molecule is in a chain shape, every two green light emitting molecules can be mutually arranged in a grid shape, or every two green light emitting molecules can be mutually crossed, and a plurality of green light emitting molecules jointly form a net structure.
Each of the green light emitting molecules is an organic light emitting molecule having a plurality of benzene ring structures, and the organic light emitting molecule may employ a fluorescent material containing Alq3 (tris (8-hydroxyquinoline) aluminum). The dopant of the green light emitting unit 122b may be selected from metal complexes, for example, organometallic complexes such as ir (ppy)3 (fac-tris (2-phenylpyridine) iridium). The green light emitting unit 122b may include a phosphorescent material, for example, ir (ppy) 3.
The blue light emitting unit 122c includes a plurality of blue light emitting molecules having magnetic anisotropy, and the blue light emitting molecules are parallel to the light emitting surface of the blue light emitting unit 122 c. Each blue light emitting molecule is in a chain shape, every two blue light emitting molecules can be mutually arranged in a grid shape, or every two blue light emitting molecules can be horizontally mutually crossed, and a plurality of blue light emitting molecules jointly form a horizontal net structure.
Each of the blue light emitting molecules is an organic light emitting molecule having a structure containing a plurality of benzene rings, and the organic light emitting molecule may employ a fluorescent material containing any one of spiro-DPVBi, spiro-6P, DSB (distyrylbenzene), DSA (distyryl-arylene), PFO (polyfluorene) based polymer, and PPV (poly (p-phenylenevinylene)) based polymer. The dopant of the blue light emitting unit 122c may be selected from metal complexes, for example, organometallic complexes such as (4,6-F2ppy)2 Irpic.
It is understood that in some embodiments, the organic light emitting layer 12 may select one or two or three of the red light emitting unit 122a, the green light emitting unit 122b and the blue light emitting unit 122c, and a user may further adjust the ratio of the color materials in the red light emitting unit 122a, the green light emitting unit 122b and the blue light emitting unit 122c, so as to adjust the color finally emitted by the organic light emitting diode device 100 a.
When an external voltage is applied to the organic light emitting diode device 100a, the red light emitting unit 122a emits red light, and the red electron blocking unit 124a blocks red electrons from moving toward the hole transport layer 16. The green light emitting unit 122b emits green light, and the green electron blocking unit 124b blocks the green photoelectrons from moving toward the hole transport layer 16. The blue light emitting unit 122c emits blue light, and the blue electron blocking unit 124c blocks blue electrons from moving toward the hole transport layer 16.
Referring to fig. 4, some embodiments of the present application provide an organic light emitting diode device 100b having substantially the same structure as the organic light emitting diode device 100a shown in fig. 3, except that the organic light emitting diode device 100b further includes a hole injection layer 15, and the hole injection layer 15 is stacked between the hole transport layer 16 and the anode 13.
The hole injection layer 15 can effectively inject holes into the hole transport layer 16, and the holes are injected into the organic light emitting layer 12 through the hole transport layer 16, so that the holes meet electrons in the organic light emitting layer 12, on one hand, the increase of the hole injection layer 15 can improve the efficiency of injecting the holes into the organic light emitting layer 12, and on the other hand, the working voltage can be reduced.
The hole injection layer 15 may include, for example, phthalocyanine compounds such as copper phthalocyanine, DNTPD (N, N '-diphenyl-N, N' -bis- [4- (phenyl-m-tolyl-amino) phenyl ] -biphenyl-4, 4 '-diamine), m-MTDATA (4,4',4 ″ -tris (3-methylphenylphenylamino) triphenylamine), TDATA (4,4',4 ″ -tris (N, N-diphenylamine) triphenylamine), 2TNATA (4,4',4 ″ -tris { N- (2-naphthyl) -N-phenylamino } -triphenylamine), PEDOT/PSS (poly (3, 4-ethylenedioxythiophene)/poly (4-styrenesulfonate)), PANI/DBSA (polyaniline/dodecylbenzenesulfonic acid), and the like, PANI/CSA (polyaniline/camphorsulfonic acid), PANI/PSS (polyaniline/poly (4-styrenesulfonate)), and the like.
Referring to fig. 5, an organic light emitting diode device 100c according to some embodiments of the present disclosure has substantially the same structure as the organic light emitting diode device 100b shown in fig. 4, except that the organic light emitting diode device 100c further includes an electron injection layer 17, and the electron injection layer 17 is stacked between the electron transport layer 14 and the cathode 11, it is understood that the hole injection layer 15 may be omitted in some embodiments.
The electron injection layer 17 can effectively inject electrons into the electron transport layer 14, and inject the electrons into the organic light emitting layer 12 through the electron transport layer 14, so that the electrons meet holes in the organic light emitting layer 12, on one hand, the increase of the electron transport layer 14 can improve the efficiency of injecting the electrons into the organic light emitting layer 12, and on the other hand, the increase can also reduce the operating voltage.
The electron injection layer 17 is made of an organic metal complex or an inorganic substance, and in some embodiments, the electron injection layer 17 is made of an alkali metal compound, for example, the electron injection layer 17 is made of LiF, LiQ, NaF, CsF, Cs2CO 3Or made of other suitable material.
It is understood that, as shown herein, the positional relationship between one or more layers of the substance involved in the embodiments of the present application, such as the terms "stacked" or "formed" or "applied" or "disposed", is expressed using terms such as: any terms such as "stacked" or "formed" or "applied" may cover all manner, kinds and techniques of "stacked". For example, sputtering, plating, molding, Chemical Vapor Deposition (CVD), Physical Vapor Deposition (PVD), evaporation, Hybrid Physical-Chemical Vapor Deposition (HPCVD), Plasma Enhanced Chemical Vapor Deposition (PECVD), Low Pressure Chemical Vapor Deposition (LPCVD), and the like.
Referring to fig. 6, another embodiment of the present application provides a method for manufacturing an organic light emitting diode device 100, including:
step S1, providing an organic light-emitting pre-fabricated layer, wherein the organic light-emitting pre-fabricated layer includes at least one organic light-emitting unit 122, each organic light-emitting unit 122 includes a plurality of organic light-emitting molecules 1224 having magnetic anisotropy, and the organic light-emitting molecules 1224 are randomly arranged.
Step S2, forming a cathode 11 and an anode 13 on the two opposite sides of the organic light emitting pre-layer, respectively.
And step S3, annealing the organic light emitting pre-layer, the cathode 11 and the anode 13. Wherein the annealing temperature is 80-100 ℃, and the annealing time is 0.5-1 h.
Step S4, the organic light emitting prefabricated layer, the cathode 11 and the anode 13 are placed in a magnetic field, so that the organic light emitting molecules 1224 are parallel to the light emitting surface 1222 of the organic light emitting unit 122, thereby obtaining the organic light emitting diode device 100.
The magnetic field may be generated by excitation of a permanent magnet or a coil, the intensity of the magnetic field is 0.3T-8T, for example, the magnetic field intensity is 2T or 5T, the direction of the magnetic field lines generated by excitation of the permanent magnet or the coil is parallel to the organic light emitting prefabricated layer, and since the organic light emitting molecules 1224 in the organic light emitting diode device 100 have magnetic anisotropy, the organic light emitting molecules 1224 may be reoriented along the magnetic induction line direction and parallel to the light emitting surface 1222 of the organic light emitting unit 122.
The organic light emitting molecules 1224 parallel to the light emitting surface 1222 of the organic light emitting unit 122 can reduce the surface plasmon effect of the organic light emitting molecules 1224 and the cathode 11, and facilitate the light extraction, so as to improve the current efficiency of the organic light emitting layer 12, and thus improve the efficiency of the organic light emitting diode device 100 at a specific brightness.
In some embodiments, the manufacturing method further includes forming an electron blocking unit 124 between the organic light emitting unit 122 and the anode 13.
In some embodiments, the manufacturing method further includes forming an electron transport layer 14 between the cathode 11 and the organic light emitting layer 12; and forming a hole transport layer 16 between the anode 13 and the organic light emitting layer 12.
In some embodiments, the method of manufacturing further comprises forming a hole injection layer 15 between the hole transport layer 16 and the anode 13.
In some embodiments, the method of manufacturing further comprises forming an electron injection layer 17 between the electron transport layer 14 and the cathode 11.
Referring to fig. 7, another embodiment of the present disclosure further provides a display device 200 including a substrate 20, a driving layer 30, a display panel 40 and a protection layer 50. Wherein the driving layer 30 is used for driving the display panel 40.
The base 20 may use a flexible substrate such as a material including thin glass, metal foil, or plastic base 20, etc. having flexibility, for example, the plastic base 20 has a flexible structure including resin such as Polyimide (PI), Polycarbonate (PC), polyethylene glycol terephthalate (PET), Polyethersulfone (PES), polyethylene film (PEN), Fiber Reinforced Plastic (FRP), etc. coated on both sides of a base film.
The driving layer 30 includes a scan circuit and a switching circuit, the scan circuit is connected to the switching circuit, and the switching circuit is connected to the organic light emitting diode device 100, 100a, 100b, or 100c in the display panel 40.
The scanning circuit scans and selects the corresponding pixel unit through the switching circuit, and applies a driving voltage to the pixel unit to make the pixel unit emit light, thereby displaying an image.
The driving layer 30 may drive the display panel 40 in different driving manners, including a Passive Matrix (PMOLED) driving manner and an Active Matrix (AMOLED) driving manner. When the driving layer 30 adopts a PMOLED mode, the switching circuit may select a Thin-film transistor (TFT) as a switching tube, and static driving or dynamic driving is realized through the action of the scanning circuit. When the driving layer 30 is an AMOLED, the switching circuit may select a Low Temperature polysilicon Thin Film Transistor (LTP-Si TFT), an amorphous silicon TFT, a polysilicon TFT, an oxide semiconductor TFT, or an organic TFT as a switching tube.
The display panel 40 includes the light emitting diode device 100, 100a, 100b, or 100c in any of the embodiments described above.
The protective layer 50 is used to protect the display panel 40, wherein the protective layer 50 may include, for example, ZrO, CeO2、ThO 2And the like. The protective layer 50 may form a transparent film to cover the entire surface of the display panel 40.
As described above, the display device 200 provided by the embodiment of the present application is flexible by being made of a flexible material, and becomes bendable. In some embodiments, the display device 200 is not only bendable but also transparent, for example, the material for manufacturing the display device 200 is a flexible transparent member, the substrate 20 is made of a polymer substance such as transparent plastic, the driving layer 30 is a transparent transistor, and the organic light emitting diode device 100, 100a, 100b or 100c in the display panel 40 is a transparent material, so that the display device 200 can be flexible and transparent.
The transparent transistor is a TFT transistor manufactured from opaque silicon by replacing the related art TFT transistor manufactured from transparent silicon with a TFT transistor manufactured from a transparent substance such as zinc oxide or titanium dioxide. In addition, the transparent electrode may be composed of a material such as Indium Tin Oxide (ITO) or graphene. Graphene has a honeycomb lattice plane structure composed of carbon atoms, and has transparency. In addition, the transparent organic light emitting layer 12 may be implemented using various substances.
By virtue of the flexible property, the display device 200 can implement various application functions by setting a bending parameter such as a bending sensor and using the bending parameter detected by the bending sensor, thereby greatly improving the experience of the user.
Compared with the prior art, the display panel 40 of the display device 200 of the present application provides an organic light emitting diode device 100, 100a, 100b, or 100c, and the organic light emitting molecules in the organic light emitting layer 12 are parallel to the light emitting surface of the organic light emitting unit, so that the random arrangement of the original organic light emitting molecules is changed, which is beneficial to light extraction, and the current efficiency of the organic light emitting diode device 100, 100a, 100b, or 100c is improved, and the service life of the organic light emitting diode device 100, 100a, 100b, or 100c is also prolonged under the same light emitting intensity.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; within the context of the present application, where technical features in the above embodiments or in different embodiments can also be combined, the steps can be implemented in any order and there are many other variations of the different aspects of the present application as described above, which are not provided in detail for the sake of brevity; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (23)
- An organic light emitting diode device, comprising:an anode;a cathode;the organic light-emitting layer is laminated between the anode and the cathode and comprises at least one organic light-emitting unit, each organic light-emitting unit comprises a plurality of organic light-emitting molecules with magnetic anisotropy, and the organic light-emitting molecules are parallel to the light-emitting surface of the organic light-emitting unit.
- The device of claim 1, wherein the organic light emitting layer comprises a red light emitting unit, a green light emitting unit, and a blue light emitting unit, and the red light emitting unit, the green light emitting unit, and the blue light emitting unit are arranged in the organic light emitting layer.
- The organic light-emitting diode device according to claim 2,the red light emitting unit comprises a plurality of red light emitting molecules with magnetic anisotropy, and each red light emitting molecule is parallel to the light emitting surface of the red light emitting unit;the green light emitting unit comprises a plurality of green light emitting molecules with magnetic anisotropy, and each green light emitting molecule is parallel to a light emitting surface of the green light emitting unit;the blue light emitting unit comprises a plurality of blue light emitting molecules with magnetic anisotropy, and each blue light emitting molecule is parallel to the light emitting surface of the blue light emitting unit.
- The organic light-emitting diode device according to claim 3, wherein each of the red light-emitting molecules, each of the green light-emitting molecules, and each of the blue light-emitting molecules are in a chain shape.
- The organic light-emitting diode device according to claim 3,every two red light-emitting molecules are mutually arranged in a grid shape;every two green light emitting molecules are mutually arranged in a grid shape;every two blue light-emitting molecules are mutually arranged in a grid shape.
- The organic light-emitting diode device according to claim 3,every two red light-emitting molecules are mutually crossed, and a plurality of red light-emitting molecules jointly form a net structure;every two green light emitting molecules are mutually crossed, and a plurality of green light emitting molecules jointly form a net structure;every two blue light-emitting molecules are mutually crossed, and a plurality of blue light-emitting molecules jointly form a net structure.
- The organic light-emitting diode device according to claim 2, further comprising at least one electron blocking unit laminated between the organic light-emitting unit and the anode.
- The organic light-emitting diode device according to claim 7,the electronic blocking unit comprises a red light blocking unit, a green light blocking unit and a blue light blocking unit;the red light blocking unit is arranged opposite to the red light emitting unit;the green light blocking unit is opposite to the green light emitting unit;the blue light blocking unit is opposite to the blue light emitting unit.
- The organic light-emitting diode device according to claim 1, wherein each of the organic light-emitting molecules has a plurality of benzene ring structures.
- The organic light-emitting diode device according to claim 1, wherein the organic light-emitting diode device is characterized in thatThe organic light emitting diode device further comprises an electron transport layer and a hole transport layer;the electron transport layer is stacked between the cathode and the organic light emitting layer and is used for transporting electrons to the organic light emitting unit;the hole transport layer is stacked between the anode and the organic light emitting layer, and is used for transporting holes to the organic light emitting unit.
- The organic light-emitting diode device according to claim 10, further comprising a hole injection layer laminated between the hole transport layer and the anode.
- The organic light-emitting diode device according to claim 10, further comprising an electron injection layer laminated between the electron transport layer and the cathode.
- A method for manufacturing an organic light emitting diode device,providing an organic light-emitting prefabricated layer, wherein the organic light-emitting prefabricated layer comprises at least one organic light-emitting unit, each organic light-emitting unit comprises a plurality of organic light-emitting molecules with magnetic anisotropy, and the organic light-emitting molecules are randomly arranged;forming a cathode and an anode on two opposite surfaces of the organic light-emitting prefabricated layer respectively;annealing the organic light-emitting prefabricated layer, the cathode and the anode;and placing the organic light-emitting prefabricated layer, the cathode and the anode in a magnetic field to enable the organic light-emitting molecules to be parallel to the light-emitting surface of the organic light-emitting unit, thereby obtaining the organic light-emitting diode device.
- The method of claim 13,the organic light-emitting prefabricated layer comprises a red light-emitting unit, a green light-emitting unit and a blue light-emitting unit.
- The method of claim 14,the red light emitting unit includes a plurality of red light emitting molecules having magnetic anisotropy;the green light emitting unit includes a plurality of green light emitting molecules having magnetic anisotropy;the blue light emitting unit includes a plurality of blue light emitting molecules having magnetic anisotropy.
- The method of claim 15,the method further includes forming an electron blocking unit between the organic light emitting unit and the anode.
- The method of claim 16,the electronic blocking unit comprises a red light blocking unit, a green light blocking unit and a blue light blocking unit;the red light blocking unit is arranged opposite to the red light emitting unit;the green light blocking unit is opposite to the green light emitting unit;the blue light blocking unit is opposite to the blue light emitting unit.
- The method of claim 13,each organic light-emitting molecule contains a plurality of benzene ring structures.
- The method of claim 13,the method further includes forming an electron transport layer between the cathode and the organic light emitting layer;a hole transport layer is formed between the anode and the organic light emitting layer.
- The method of claim 19,the method also includes forming a hole injection layer between the hole transport layer and the anode.
- The method of claim 19,the method also includes forming an electron injection layer between the electron transport layer and the cathode.
- A display panel comprising the organic light emitting diode device according to any one of claims 1 to 12.
- A display device, comprising:a substrate;a driving layer disposed on the substrate; and the number of the first and second groups,the display panel of claim 22, disposed on the driving layer, the driving layer for driving the display panel.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2018/119558 WO2020113517A1 (en) | 2018-12-06 | 2018-12-06 | Organic light-emitting diode device and manufacturing method therefor, display panel and display device |
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| CN112640145A true CN112640145A (en) | 2021-04-09 |
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| CN201880095898.1A Pending CN112640145A (en) | 2018-12-06 | 2018-12-06 | Organic light emitting diode device, preparation method thereof, display panel and display device |
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| WO (1) | WO2020113517A1 (en) |
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| WO2020113517A1 (en) | 2020-06-11 |
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Application publication date: 20210409 |