CN112909195B - Organic light emitting display device, display panel and display apparatus - Google Patents
Organic light emitting display device, display panel and display apparatus Download PDFInfo
- Publication number
- CN112909195B CN112909195B CN202110127466.8A CN202110127466A CN112909195B CN 112909195 B CN112909195 B CN 112909195B CN 202110127466 A CN202110127466 A CN 202110127466A CN 112909195 B CN112909195 B CN 112909195B
- Authority
- CN
- China
- Prior art keywords
- optionally substituted
- display device
- organic
- electron transport
- organic light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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]
- H10K50/14—Carrier transporting layers
- H10K50/16—Electron transporting layers
- H10K50/165—Electron transporting layers comprising dopants
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
Abstract
The invention discloses an organic light-emitting display device and a display surfaceA panel and a display device. The organic light-emitting display device comprises an electron transport layer positioned between a light-emitting layer and a cathode, wherein the electron transport layer comprises an electron transport material and an organic doping material, and the organic doping material enables the infrared spectrum of the electron transport material to be shifted to the direction of low wave number in at least one stretching vibration peak of a fingerprint area, and the shift is more than or equal to 5cm ‑1 . According to the embodiment of the invention, the organic light-emitting display device can have higher luminous efficiency and longer device life.
Description
Technical Field
The invention relates to the technical field of display, in particular to an organic light-emitting display device, a display panel and a display device.
Background
An Organic Light Emitting Display device based on Organic Light Emitting Display (OLED) technology is driven by an electric field, and electrons and holes are injected into a Light Emitting layer from a cathode and an anode respectively and are recombined to realize Light Emitting Display.
Generally, in an OLED device, due to the characteristics of the organic material itself, the electron injection and transport capability is low, the number of recombination of electrons and holes in the light emitting layer is limited, and the light emitting efficiency of the OLED device is ultimately affected. Therefore, improving the electron injection and transport capability of the OLED device is an important direction to improve the light emitting efficiency. How to improve the luminous efficiency of the OLED device and make the device have longer service life is an important problem in the research and development field of display technology.
Disclosure of Invention
The invention provides an organic light-emitting display device, a display panel and a display device, aiming at ensuring that the organic light-emitting display device simultaneously has higher luminous efficiency and longer service life of the device.
The invention provides an organic light-emitting display (OLED) device, which comprises an electron transport layer positioned between a light-emitting layer and a cathode, wherein the electron transport layer comprises an electron transport material and an organic doping material, and the organic doping material enables the infrared spectrum of the electron transport material to be shifted to the direction of low wave number in at least one stretching vibration peak of a fingerprint area, and the shift is more than or equal to 5cm -1 。
The OLED device provided by the invention is characterized in that the organic doping material is introduced into the electron transport layerStrong intermolecular interaction is formed between the organic doping material and the electron transport material, so that at least one stretching vibration peak of the infrared spectrum of the electron transport material after doping in a fingerprint region generates a low wave number direction of more than or equal to 5cm relative to the electron transport material before doping -1 Displacement of (2). Therefore, the electron injection and transmission capability of the electron transmission material is effectively enhanced, so that the current density of the OLED device can be improved, and higher luminous efficiency can be obtained. Meanwhile, the OLED device can obtain higher stability and longer service life.
In any of the embodiments of the present invention, the displacement of the stretching vibration peak is 5cm -1 ～200cm -1 . Preferably, the displacement of the peak of the stretching vibration is 10cm -1 ～200cm -1 . Preferably, the displacement of the peak of the stretching vibration is 10cm -1 ～100cm -1 。
In any embodiment of the invention, the infrared spectrum fingerprint area of the electron transport material is 1300cm -1 ～650cm -1 In the wavenumber range of (c).
In any of the embodiments of the present invention, the stretching vibration peak is a peak having the largest integrated area of the fingerprint region or a peak having the highest peak height.
In any of the embodiments of the present invention, the organic doping material is selected from one or more of an optionally substituted fused ring aromatic compound and derivatives thereof, an optionally substituted biphenyl and derivatives thereof.
In any embodiment of the present invention, the organic doping material is selected from one or more of an optionally substituted 14-to 40-membered fused ring aromatic hydrocarbon compound and a derivative thereof, an optionally substituted 18-to 36-membered biphenyl and a derivative thereof.
In any embodiment of the invention, the organic doping material is selected from one or more of optionally substituted anthracene, optionally substituted phenanthrene, optionally substituted pyrene, optionally substituted picene, optionally substituted benzanthracene, optionally substituted triphenylene, optionally substituted benzopyrene, optionally substituted dibenzanthracene, optionally substituted dibenzphenanthrene, optionally substituted dibenzpyrene, optionally substituted coronene, optionally substituted terphenyl, optionally substituted tetrabiphenyl, optionally substituted pentabiphenyl, optionally substituted hexabiphenyl.
In any of the embodiments of the present invention, the organic doping material is uniformly doped in the electron transport layer.
In any embodiment of the present invention, the organic doping material accounts for 1% to 10% of the mass of the electron transport layer.
A second aspect of the invention provides a display panel comprising an OLED device according to the invention. The display panel of the invention adopts the OLED device, thus having higher luminous efficiency, higher stability and longer service life.
A third aspect of the invention provides a display device comprising a display panel according to the invention. The display device of the invention adopts the display panel of the invention, thus having higher luminous display efficiency and stability.
Drawings
Other features, objects and advantages of the invention will become apparent from the following detailed description of non-limiting embodiments thereof, when read in conjunction with the accompanying drawings, in which like reference characters designate the same or similar parts throughout the figures thereof, and which are not to scale.
Fig. 1 is a schematic structural view of an organic light emitting display device according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present invention.
Fig. 3 is a graph of voltage-current density of the organic light emitting display devices of examples 1 to 3 and comparative example 1.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.
It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
For the sake of brevity, only some numerical ranges are explicitly disclosed herein. However, any lower limit may be combined with any upper limit to form ranges not explicitly recited; and any lower limit may be combined with any other lower limit to form a range not explicitly recited, and similarly any upper limit may be combined with any other upper limit to form a range not explicitly recited. Also, although not explicitly recited, each point or individual numerical value between the endpoints of a range is encompassed within that range. Thus, each point or individual value may, as its lower or upper limit, be combined with any other point or individual value or with other lower or upper limits to form ranges not explicitly recited.
In the description herein, the terms "above" and "below" are intended to include the present numbers, and the meaning of "a plurality" is two or more unless otherwise indicated.
In the OLED device, an electron transport layer is generally disposed between the light emitting layer and the cathode to ensure that electrons injected from the cathode can be transported to the light emitting layer to be recombined with holes, so as to obtain high light emitting efficiency. The inventors found that doping an alkali metal or an alkali metal compound having a low work function as an N-type dopant in the electron transport layer can improve the electron mobility to some extent, but the alkali metal and the alkali metal compound have defects of high reactivity and high diffusivity, which may affect the stability and the lifetime of the device.
The inventors have further conducted extensive studies to provide a scheme for enhancing electron injection and transport capabilities of the electron transport layer using an organic dopant material that forms strong intermolecular interactions with the electron transport material. By adopting the scheme, the OLED device has higher luminous efficiency and longer service life.
Based on this, the present invention provides an OLED device. The OLED device comprises an electron transport layer positioned between a light emitting layer and a cathode, wherein the electron transport layer comprises an electron transport material and an organic doping material, and the organic doping material enables the infrared spectrum of the electron transport material to be shifted to the low wave number direction in at least one stretching vibration peak of a fingerprint area, and the shift is more than or equal to 5cm -1 。
The infrared spectra of the electron transport material before and after doping with the organic dopant material can be determined using instruments and methods known in the art. Such as an infrared spectrometer (e.g., a fourier transform infrared spectrometer of the FTIR-1500 type). The infrared spectrum of the electron transport material before doping can adopt a KBr tablet method to test the electron transport material which is not doped with the organic doping material; the infrared spectrum of the doped electron transport material can be tested by adopting a KBr tablet pressing method on the electron transport material doped with the organic doping material. Preferably, the electron transport material which is not doped with the organic doping material can be made into a membrane by adopting a spin coating method or a vacuum evaporation method, and the electron transport material and the organic doping material can be made into the membrane by adopting the spin coating method or the vacuum co-evaporation method; the infrared spectra of the film samples were separately tested for analysis.
In the infrared spectrum of electron transport materials, the fingerprint region is a meaning known in the art. The infrared characteristic peak of the fingerprint area has strong characteristic and can reflect the tiny change of molecules. Optionally, the fingerprint area is 1300cm -1 ～650cm -1 The wavenumber range of (2).
In the infrared spectrum of the electron transport material, the displacement of the characteristic peak with larger integral area or higher peak height of the fingerprint area can be selected to represent the intermolecular interaction of the organic doping material to the electron transport material. Alternatively, the stretching vibration peak is a peak having the largest integrated area of the fingerprint region or a peak having the highest peak height.
In the OLED device provided by the invention, the organic doping material is introduced into the electron transport layer, and strong intermolecular interaction is formed between the organic doping material and the electron transport material, so that at least one stretching vibration peak of the infrared spectrum of the doped electron transport material in a fingerprint region generates a low wave number direction of more than or equal to 5cm relative to the electron transport material before doping -1 Of (2). Therefore, the electron injection and transmission capability of the electron transmission material is effectively enhanced, so that the current density of the OLED device can be improved, and higher luminous efficiency can be obtained.
Without wishing to be bound by any theory, by making the strong intermolecular interaction of the organic doping material with the electron transport material satisfy the above conditions, the electron cloud distribution of the electron transport material can be changed, the LUMO level of the electron transport material is reduced, and thus the potential barrier for electron injection and transport can be reduced, thereby improving the electron injection and transport capabilities, and achieving the purpose of improving the light emitting efficiency of the OLED device. The improvement of the electron injection and transmission capability is also beneficial to reducing the working voltage of the OLED device. In addition, the stability of the electron transport layer doped with the organic doping material is good, so that the OLED device can obtain high stability and long service life.
In some embodiments, the organic doping material causes the infrared spectrum of the electron transport material to occur by greater than or equal to 5cm in the low wavenumber direction of at least one stretching vibration peak in the fingerprint region -1 Greater than or equal to 8cm -1 Greater than or equal to 10cm -1 Greater than or equal to 12cm -1 Greater than or equal to 15cm -1 Greater than or equal to 20cm -1 Greater than or equal to 30cm -1 Greater than or equal to 40cm -1 Greater than or equal to 50cm -1 Or greater than or equal to 60cm -1 Displacement of (2). Organic doping material to electron transport materialThe material has stronger intermolecular interaction, and can further reduce the potential barrier of electron injection and transmission, thereby further improving the electron injection and transmission capability, further improving the luminous efficiency of the OLED device, and further reducing the working voltage.
In some embodiments, the organic doping material shifts the infrared spectrum of the electron transport material in the low wavenumber direction of at least one stretching vibration peak in the fingerprint region, and the shift is less than or equal to 200cm -1 Less than or equal to 180cm -1 Less than or equal to 150cm -1 Less than or equal to 120cm -1 Less than or equal to 100cm -1 Less than or equal to 90cm -1 Less than or equal to 80cm -1 Less than or equal to 60cm -1 Less than or equal to 50cm -1 Less than or equal to 30cm -1 Or less than or equal to 20cm -1 . The organic doping material has proper strength for intermolecular interaction of the electron transport material, is favorable for matching electron transport and hole transport of the OLED device, promotes the balance of electrons and holes injected into the light emitting layer, and is favorable for improving the light emitting efficiency of the OLED device.
In some embodiments, the organic doping material shifts the infrared spectrum of the electron transport material by 5cm in the low wavenumber direction of at least one stretching vibration peak in the fingerprint region -1 ～200cm -1 ，10cm -1 ～200cm -1 ，20cm -1 ～200cm -1 ，10cm -1 ～150cm -1 ，20cm -1 ～150cm -1 ，30cm -1 ～120cm -1 ，50cm -1 ～150cm -1 ，10cm -1 ～100cm -1 ，8cm -1 ～50cm -1 ，10cm -1 ～20cm -1 ，20cm -1 ～100cm -1 Or 20cm -1 ～80cm -1 And the like.
In the OLED device of the present invention, the organic doping material may be any organic material that can shift the infrared spectrum of the electron transport material appropriately in the low wave number direction of at least one stretching vibration peak in the fingerprint region. In some embodiments, the organic doping material is a material having a conjugated effect. Further, the organic doping material may be selected from one or more of an optionally substituted fused ring aromatic compound and derivatives thereof, an optionally substituted biphenyl and derivatives thereof.
The term "fused ring aromatic compound" is a polycyclic organic compound in which two or more benzene rings share a ring edge. In some embodiments, the fused ring aromatic compound includes an optionally substituted 14-to 40-membered fused ring aromatic compound. In each embodiment, the 14-to 40-membered fused ring aromatic hydrocarbon compound, that is, the fused ring aromatic hydrocarbon compound, may contain 14 to 40 carbon atoms for forming a fused ring. Alternatively, the fused ring aromatic compound includes an optionally substituted 14-to 30-membered fused ring aromatic compound, or an optionally substituted 14-to 22-membered fused ring aromatic compound.
As an example, the fused ring aromatic compound may include one or more of optionally substituted anthracene, optionally substituted phenanthrene, optionally substituted pyrene, optionally substituted picene, optionally substituted benzanthracene, optionally substituted triphenylene, optionally substituted benzopyrene, optionally substituted dibenzoanthracene, optionally substituted dibenzophenanthrene, optionally substituted dibenzopyrene, optionally substituted coronene. Examples of benzanthracenes may include tetracene, 1, 2-benzo [ A ]]Anthracene, and the like. Examples of dibenzoanthracenes can include pentacene, perylene, 1,2:5, 6-dibenzoanthracene, 1,2:7, 8-dibenzoanthracene, and the like. Examples of triphenylenes can include
3, 4-triphenylene, and the like. Examples of dibenzophenanthrenes may include dibenzo [ C, G ]]Phenanthrene, 2,3:6, 7-dibenzophenanthrene, 1,2:5, 6-dibenzophenanthrene, and the like. Examples of benzopyrenes may include 1, 2-benzopyrene (also known as 3, 4-benzopyrene), 4, 5-benzopyrene, and the like. Examples of dibenzopyrenes may include dibenzo [ a, h ]]Pyrene, dibenzo [ b, h ]]Pyrene and the like.
The term "biphenyl" is a multi-benzene ring organic compound formed by two or more phenyl groups connected together. In some embodiments, biphenyl includes an optionally substituted 18-to 36-membered biphenyl. In various embodiments, 18-to 36-membered biphenyls, i.e., biphenyls, can contain 18 to 36 carbon atoms for forming a benzene ring. Optionally, the biphenyl includes an optionally substituted 18-to 30-membered biphenyl, or an optionally substituted 18-to 24-membered biphenyl.
As an example, biphenyl includes one or more of optionally substituted terphenyl, optionally substituted quaterphenyl, optionally substituted pentabiphenyl, optionally substituted hexabiphenyl. Examples of terphenyls may include p-terphenyl, o-terphenyl, m-terphenyl. Examples of the quaterphenyl group may include p-quaterphenyl group, 3 '-diphenylbiphenyl group, 2, 3' -diphenylbiphenyl group, and the like. Examples of pentabiphenyls may include p-pentabiphenyl, M-pentabiphenyl, and the like. Examples of hexabiphenyls may include p-hexabiphenyls and the like.
In other embodiments, the organic doping material may also be selected from derivative compounds obtained by replacing one or more benzene rings in the above-described fused-ring aromatic hydrocarbon compounds or biphenyls with carbocyclic rings (e.g., cyclopentadiene, cycloheptatriene, etc.). Where a plurality may be 2 or 3, etc.
The organic doping material can also be selected from the derivative compounds obtained by replacing one or more carbon(s) on the ring(s) in the fused ring aromatic hydrocarbon compound or biphenyl or derivative compound with elements (such as N, O, S, Si and the like) except carbon. The number of the plurality of the.
The condensed ring aromatic hydrocarbon compound, the biphenyl and the derivatives thereof have stronger conjugation effect in the molecular structure, and can enhance the interaction with the electron transport material, thereby improving the electron injection and transport capability of the electron transport material.
When a compound is referred to as "substituted," the feature may have one or more substituents, unless otherwise specified. The term "substituent" has the broadest meaning known to those of ordinary skill in the art and includes such fragments (moiety): which occupies the position normally occupied by the hydrogen atom or atoms attached to the parent compound. In some embodiments, the substituent may be a common organic moiety known in the art, which may have a molecular weight (e.g., the sum of the atomic masses of the atoms of the substituent) of 15 to 50g/mol, 15 to 100g/mol, 15 to 200g/mol, or 15 to 500 g/mol. Some substituents include F, Cl, Br, I, NO 2 、C 1-12 H 3-25 、C 1-12 H 1-25 O、C 1-12 H 1-25 O 2 、C1-12H 3-26 N、C 1-12 H 1-26 NO、C 1-12 H 3-27 N 2 、C 1-12 F 3-25 Substituted or unsubstituted phenyl, substituted or unsubstituted naphthyl, substituted or unsubstituted C3-C10 heteroaryl, and the like.
Throughout this specification, compounds or substituents of compounds are disclosed in groups or ranges. It is expressly intended that such description include each individual sub-combination of members of these groups and ranges. For example, integers in the range of 14-30 are expressly contemplated to disclose 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, and 30 individually. Accordingly, other groups or ranges are expressly contemplated.
In the OLED device of the present invention, the electron transport material may be selected from materials known in the art. As an example, the electron transport material may be selected from oxadiazole derivatives such as BpyOXD, BpyOXDPy, OXD-7, and the like; metal chelates such as Alq 3; azole derivatives such as oxazole, triazole, triazobenzene, imidazole, thiazole, benzothiazole, TPBi, and the like; a quinoline derivative; an oxinoid derivative; for example, diazophenanthrene derivatives such as BCP and BPhen.
In some embodiments, the mass ratio of the organic doping material in the electron transport layer may be 1% to 10%, for example, 2% to 8%, 1% to 5%, 2% to 6%, 3% to 7%, 4% to 6%, or 5% to 10%.
In some embodiments, the organic doping material is uniformly doped in the electron transport layer. Therefore, the organic doping material can better exert the effects, so that the OLED device has higher luminous efficiency, longer service life and lower working voltage.
In the OLED device of the present invention, the electron transport layer including the electron transport material and the dopant material may be prepared using a vacuum co-evaporation method or a spin coating method.
In the OLED device of the present invention, the light-emitting layer may comprise a light-emitting material as known in the art. Further, the light emitting material may include a host material and a guest material. The light emitting material may be selected from light emitting materials known in the art for use in organic light emitting devices. The light emitting material may be a fluorescent light emitting material, a phosphorescent light emitting material, or the like, and may be a blue light emitting material, a green light emitting material, a red light emitting material, or the like. The matching and selection of the host material and the guest material can be performed by those skilled in the art according to the different luminescent principles and luminescent colors.
In the OLED device of the present invention, materials known in the art can be used for the cathode. As an example, the cathode material may be selected from aluminum, magnesium, silver, indium, tin, titanium, metal oxides, metal halides, and the like.
The OLED device of the present invention also includes an anode. The anode is positioned on the side of the light-emitting layer facing away from the cathode. The anode may be made of any material known in the art. As an example, the anode material may include a metal such as copper, gold, silver, iron, chromium, nickel, manganese, palladium, platinum, and alloys thereof, a metal oxide such as indium oxide, zinc oxide, indium tin oxide ITO, indium zinc oxide IZO, and the like.
In some embodiments, the OLED device of the present invention may also optionally include other functional film layers. The other functional film layers may include one or more of an electron injection layer between the cathode and the electron transport layer, a hole blocking layer between the electron transport layer and the light emitting layer, a hole transport layer between the light emitting layer and the anode, an electron blocking layer between the light emitting layer and the hole transport layer, and a hole injection layer between the anode and the hole transport layer. The materials of the layers (e.g., electron injecting material, hole blocking material, electron blocking material, hole transporting material, hole injecting material) can each be selected from the corresponding materials known in the art.
The organic light emitting display device may be a top emission device or a bottom emission device.
Fig. 1 is a schematic structural view of an organic light emitting display device 100 as one example. As shown in fig. 1, the organic light emitting display device 100 includes a substrate 1, an anode 2, a hole injection layer 3, a hole transport layer 4, an electron blocking layer 5, a light emitting layer 6, a hole blocking layer 7, an electron transport layer 8, an electron injection layer 9, a cathode 10, and a capping layer 11, which are sequentially stacked. The arrows in the figure indicate the light direction. The organic light emitting display device 100 is a top emission device. The substrate 1, the hole injection layer 3, the hole transport layer 4, the electron blocking layer 5, the hole blocking layer 7, and the electron injection layer 9 are not essential film layers, and those skilled in the art can select them according to actual needs.
The present invention also provides a display panel including the organic light emitting display device according to the present invention. Fig. 2 is a schematic structural diagram of a display panel 200 as an example. As shown in fig. 2, the display panel 200 includes a substrate 210 and organic light emitting units 220 arrayed on the substrate 210. The organic light emitting unit 220 serves to emit light to display image information. Each organic light emitting unit 220 may include the organic light emitting display device 100 according to the present application, and further include a pixel circuit device 221 for driving the organic light emitting display device 100 to emit light, and other optional modules known in the art.
The organic light emitting display device 100 is spaced apart from the pixel circuit device 221 by a planarization layer, and the anode 2 or the cathode 10 of the organic light emitting display device 100 is electrically connected to the connection electrode of the pixel circuit device 221. As an example, the pixel circuit device 221 is located on the substrate 210, and may include one or more thin film transistors TFT and one or more storage capacitors Cst. The above-described TFT may be a top gate type TFT or a bottom gate type TFT. The planarization layer is located on a side of the pixel circuit device 221 facing away from the substrate 210. The anode 2 or the cathode 10 of the organic light emitting display device 100 is electrically connected to a connection electrode (e.g., a drain electrode D) of the pixel circuit device 221 through the planarization layer.
In the organic light emitting display device 100, the light emitting layer 6 is generally positioned within a pixel opening of the pixel defining layer. One of the anode 2 and the cathode 10 remote from the substrate 210, and other organic film layers (e.g., the electron injection layer 9, the electron transport layer 8, the hole blocking layer 7, the electron blocking layer 5, the hole transport layer 4, the hole injection layer 3) other than the light-emitting layer 6 may be common layers. The common layer is generally formed continuously so as to be shared by the plurality of organic light emitting units 220.
An encapsulation layer 230 is also typically disposed on the side of the organic light emitting device 100 facing away from the substrate 210. The encapsulation layer 230 may include one or more of polyolefin, polyvinyl chloride, polystyrene, Polyimide (PI), polyethylene terephthalate (PET), epoxy, phenolic, silicon oxide, silicon nitride, silicon-based oxynitride, and the like.
In the present application, optional technical features in the organic light emitting device are also applicable to the display panel, and the display panel obtains corresponding beneficial effects, which are not described herein again.
The invention also provides a display device comprising the display panel according to the invention. The display device of the invention can have higher luminous efficiency due to the adoption of the display panel.
Examples of display devices may be, for example, cell phones, tablet computers, smart learning machines, and the like.
In the present application, the selectable technical features of the display panel are also applicable to the display device, and the display device obtains corresponding beneficial effects, which are not described herein again.
Examples
The present disclosure is more particularly described in the following examples that are intended as illustrative only, since various modifications and changes within the scope of the present disclosure will be apparent to those skilled in the art. Unless otherwise stated, all reagents used in the following examples are commercially available or synthesized according to conventional methods, and the instruments used in the examples are commercially available.
Example 1
The present embodiment provides an OLED device, which has a structure as shown in fig. 1, and includes a substrate 1, an anode 2, a hole injection layer 3, a hole transport layer 4, an electron blocking layer 5, a light emitting layer 6, a hole blocking layer 7, an electron transport layer 8, an electron injection layer 9, a cathode 10, and a capping layer 11, which are sequentially stacked, where arrows in fig. 1 represent the light emitting direction of the device.
The specific preparation steps of the OLED device are as follows:
a glass substrate 1 with an Indium Tin Oxide (ITO) anode 2 (the thickness is 15nm) is sequentially cleaned by isopropanol and deionized water in an ultrasonic mode, dried and then placed in a vacuum chamber.
A hole injection layer 3 was formed by vacuum-evaporating a hole injection material a on the ITO anode 2 to a thickness of 10 nm.
A hole transport layer 4 was formed by vacuum vapor-depositing a hole transport material b on the hole injection layer 3 to a thickness of 100 nm.
An electron blocking layer 5 was formed on the hole transport layer 4 by vacuum evaporation of an electron blocking material c to a thickness of 50 nm.
A light-emitting host material d and a light-emitting guest material e are co-evaporated on the electron blocking layer 5 in vacuum with a doping amount of 10% (mass ratio) to form a light-emitting layer 6 with a thickness of 20 nm.
A hole-blocking layer 7 was formed on the light-emitting layer 6 by vacuum deposition of a hole-blocking material f to a thickness of 5 nm.
An electron transport material g and a dopant material h were vacuum co-evaporated on the hole blocking layer 7 with a dopant amount of 10% (mass ratio) to form an electron transport layer 8 with a thickness of 15 nm.
An electron injection layer 9 was formed on the electron transport layer 8 by vacuum evaporation of an electron injection material i, and the thickness was 5 nm.
A magnesium-silver cathode 10 was vacuum-deposited on the electron injection layer 9 to a thickness of 15 nm.
A capping layer 11 was formed by vacuum evaporation of a capping layer material j on the aluminum cathode 10 to a thickness of 80 nm.
The preparation methods of the OLED devices in examples 2 to 5 and comparative examples 1 to 3 are similar to application example 1, except that the doping material h and the doping amount of the electron transport layer 8 are changed as detailed in table 1.
The compounds used in the preparation of each of the above OLED devices were as follows:
hole injection material a: 2,3,6,7,10, 11-hexacyano-1, 4,5,8,9, 12-hexaazatriphenylene (HAT-CN)
Hole transport material b: 4,4' -Cyclohexylbis [ N, N-bis (4-methylphenyl) aniline (TAPC)
Electron blocking material c: 4,4',4 "-Tris (carbazol-9-yl) triphenylamine (TCTA)
Luminescent host material d: 4, 4-bis (9-Carbazole) Biphenyl (CBP)
Light-emitting guest material e: tris (2-phenylpyridine) iridium Ir (ppy) 3
Hole blocking material f: BCP
Electron transport material g: TPBi
Doping material h 1: p-tetrabiphenyl
Doping material h 2: p-penta biphenyl
Doping material h 3: p-hexa biphenyl
Doping material h 4: 1, 2-benzopyrene
Doping material h 5: 1,2:5, 6-dibenzoanthracenes
Doping material h 6: LiF
Doping material h 7: 1, 5-diazabicyclo [4.3.0] -5-nonene (DBN)
Electron injection material i: yb of
Capping layer material j: n, N '-diphenyl-N, N' - (1-naphthyl) -1,1 '-biphenyl-4, 4' -diamine (NPB)
Test section
1. The infrared spectrum of the electron transport material before and after the organic doping material is doped is tested by adopting an FTIR-1500 Fourier transform infrared spectrometer. Preparing an electron transmission material which is not doped with an organic doping material into a membrane by adopting a spin-coating method, and preparing the electron transmission material and the organic doping material into the membrane by adopting the spin-coating method; the infrared spectra of the film samples were separately tested for analysis. Selecting fingerprint region (wave number range 1300 cm) -1 ～650cm -1 ) And (3) a stretching vibration peak with the highest peak height to characterize the intermolecular interaction of the organic doping material on the electron transport material. The test results are shown in table 1.
2. Performance evaluation of OLED devices: IVL data were tested using a keithley 2400/PR 705. And calculating the current density of the device according to the current divided by the light-emitting area, and drawing a voltage-current density curve. The operating voltage of the OLED device is the voltage corresponding to a luminance of 10000nits (green light). The current efficiency was used to evaluate the device luminous efficiency. The lifetime test of the device uses keithley3706 power supply, and the hamamatsu silicon photodiode detects the lifetime of the device when the brightness decays to the same percentage of the initial brightness. The test results are shown in fig. 1 and table 1.
TABLE 1
Fig. 1 shows the current densities of the OLED devices of examples 1-3 and comparative example 1 at different voltages. As can be seen from FIG. 1, by introducing the organic doping material into the electron transport layer, and making the infrared spectrum of the electron transport material after doping produce a stretching vibration peak in the fingerprint region relative to the electron transport material before doping, which produces a lower wavenumber direction of greater than or equal to 5cm -1 The electron injection and transmission capability of the electron transmission material are enhanced, so that the current density of the OLED device is improved. And as can be seen from the data in table 1, the luminous efficiency of the OLED devices of examples 1 to 3 is significantly improved, the operating voltage of the devices is significantly reduced, and the lifetime of the devices is significantly increased as compared with the undoped OLED device of comparative example 1.
As can be seen from the comparison between examples 1-5 and comparative examples 2-3, the doping scheme of the invention not only enables the OLED device to obtain higher luminous efficiency, but also improves the service life of the device and reduces the working voltage of the device. Comparative example 2 and comparative example 3, which are doped with an alkali metal compound and an organic base, respectively, have higher operating voltage of the device, especially lower lifetime of the device, although the luminous efficiency of the OLED device is also higher.
In accordance with the above-described embodiments of the present invention, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and their full scope and equivalents.
Claims (12)
1. An organic light-emitting display device comprising an electron transport layer disposed between a light-emitting layer and a cathode, the electron transport layer comprising an electron transport material and an organic dopant material, the organic dopant material shifting the infrared spectrum of the electron transport material in the low wavenumber direction of at least one stretching vibration peak in the fingerprint region, the shift being greater than or equal to 5cm -1 。
2. The organic light emitting display device of claim 1, wherein the fingerprint region is 1300cm -1 ～650cm -1 The wave number range of (d); and/or the presence of a gas in the gas,
the stretching vibration peak is the peak with the largest integral area of the fingerprint area or the peak with the highest peak height.
3. An organic light-emitting display device according to claim 1 or 2, wherein the displacement is 5cm -1 ～200cm -1 。
4. The organic light-emitting display device according to claim 3, wherein the displacement is 10cm -1 ～200cm -1 。
5. The organic light-emitting display device according to claim 3, wherein the displacement is 10cm -1 ～100cm -1 。
6. The organic light-emitting display device according to claim 1, wherein the organic doping material is selected from one or more of an optionally substituted fused ring aromatic hydrocarbon compound and a derivative thereof, an optionally substituted biphenyl and a derivative thereof.
7. The organic light-emitting display device according to claim 1, wherein the organic doping material is selected from one or more of an optionally substituted 14-to 40-membered fused ring aromatic hydrocarbon compound and a derivative thereof, an optionally substituted 18-to 36-membered biphenyl and a derivative thereof.
8. An organic light-emitting display device according to claim 1, wherein the organic doping material is selected from one or more of optionally substituted anthracene, optionally substituted phenanthrene, optionally substituted pyrene, optionally substituted picene, optionally substituted benzanthracene, optionally substituted triphenylene, optionally substituted benzopyrene, optionally substituted dibenzoanthracene, optionally substituted dibenzophenanthrene, optionally substituted dibenzopyrene, optionally substituted coronene, optionally substituted terphenyl, optionally substituted tetrabiphenyl, optionally substituted pentabiphenyl, optionally substituted hexabiphenyl.
9. The organic light-emitting display device of claim 1, wherein the organic doping material is uniformly doped in the electron transport layer.
10. The organic light-emitting display device according to claim 1, wherein the organic doping material is 1% to 10% by mass of the electron transport layer.
11. A display panel comprising the organic light emitting display device according to any one of claims 1 to 10.
12. A display device comprising the display panel according to claim 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110127466.8A CN112909195B (en) | 2021-01-29 | 2021-01-29 | Organic light emitting display device, display panel and display apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110127466.8A CN112909195B (en) | 2021-01-29 | 2021-01-29 | Organic light emitting display device, display panel and display apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112909195A CN112909195A (en) | 2021-06-04 |
| CN112909195B true CN112909195B (en) | 2022-09-30 |
Family
ID=76121285
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110127466.8A Active CN112909195B (en) | 2021-01-29 | 2021-01-29 | Organic light emitting display device, display panel and display apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112909195B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6387546B1 (en) * | 1998-05-19 | 2002-05-14 | Sanyo Electric Co., Ltd. | Organic electroluminescent device |
| CN1700829A (en) * | 2004-05-21 | 2005-11-23 | 株式会社半导体能源研究所 | Light-emitting element |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3825725B2 (en) * | 1998-05-19 | 2006-09-27 | 三洋電機株式会社 | Organic electroluminescence device |
-
2021
- 2021-01-29 CN CN202110127466.8A patent/CN112909195B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6387546B1 (en) * | 1998-05-19 | 2002-05-14 | Sanyo Electric Co., Ltd. | Organic electroluminescent device |
| CN1700829A (en) * | 2004-05-21 | 2005-11-23 | 株式会社半导体能源研究所 | Light-emitting element |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112909195A (en) | 2021-06-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6922008B2 (en) | Light emitting elements, light emitting devices, electronic devices and lighting devices | |
| CN106068267B (en) | Electronics padded coaming and Organnic electroluminescent device comprising it | |
| KR101914652B1 (en) | Organic compound and Organic light emitting diode and organic emitting display device including the same | |
| TWI478624B (en) | Organic electroluminescent elements | |
| CN101404323B (en) | Light-emitting component, display unit and e-machine | |
| KR101688317B1 (en) | Organic light emitting diode having low operating voltage and method for fabricating the same | |
| US9136495B2 (en) | Organic light-emitting device | |
| CN103827257B (en) | Organic light emitting diode | |
| US7843129B2 (en) | White organic light emitting device and display apparatus and lighting apparatus comprising the same | |
| KR101453874B1 (en) | White organic light emitting device | |
| CN110492007B (en) | Acridine compound and application thereof in organic electroluminescent device | |
| JP2005100921A (en) | Organic el element and display | |
| JP2004006287A (en) | Organic electroluminescent device | |
| JP5458554B2 (en) | Organic electroluminescence device and display device | |
| KR100965590B1 (en) | Organic Light Emitting Display Device | |
| TWI391467B (en) | Organic electroluminescent device and display apparatus | |
| CN104241536A (en) | Organic light-emitting device | |
| US20120119196A1 (en) | Organic electroluminescent element | |
| CN114057718A (en) | Triphenylamine derivative, preparation, organic photoelectric device and display or lighting device | |
| CN112909195B (en) | Organic light emitting display device, display panel and display apparatus | |
| JP2004200104A (en) | Organic electroluminescent element and display device | |
| KR101999709B1 (en) | Organic light emitting device | |
| CN111864097A (en) | Organic electroluminescent device and display device thereof | |
| KR20210016971A (en) | Organic electroluminescent device | |
| JP2004200103A (en) | Organic electroluminescent element and display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |