WO2024198053A1 - 发光器件及显示面板 - Google Patents
发光器件及显示面板 Download PDFInfo
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- WO2024198053A1 WO2024198053A1 PCT/CN2023/093753 CN2023093753W WO2024198053A1 WO 2024198053 A1 WO2024198053 A1 WO 2024198053A1 CN 2023093753 W CN2023093753 W CN 2023093753W WO 2024198053 A1 WO2024198053 A1 WO 2024198053A1
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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]
- H10K50/19—Tandem OLEDs
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- 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
- H10K59/10—OLED displays
Definitions
- the present application relates to the field of display, and in particular to a light-emitting device and a display panel.
- OLED Organic light-emitting display panels
- the embodiments of the present application provide a light-emitting device and a display panel, which can solve the problems of current series-type light-emitting devices, such as insufficient light-emitting efficiency, insufficient brightness to meet usage requirements, and insufficient lifetime of the light-emitting devices.
- the present application provides a light emitting device, comprising:
- a substrate a first electrode, disposed on the substrate;
- a light-emitting functional layer arranged on a side of the first electrode away from the substrate, the light-emitting functional layer comprising a first light-emitting layer, a charge generation layer and a second light-emitting layer arranged in sequence on the first electrode, the first light-emitting layer comprising a first light-emitting sublayer, and the second light-emitting layer comprising a second light-emitting sublayer;
- a second electrode is arranged on a side of the second light-emitting layer away from the charge generating layer;
- the triplet lifetime of the material of the first luminescent sublayer is greater than that of the material of the second luminescent sublayer.
- the triplet lifetime of the material, the luminescence efficiency of the material of the first luminescent sublayer is less than the luminescence efficiency of the material of the second luminescent sublayer.
- the first light-emitting sublayer includes a first host material and a first doping material, and the first doping material includes a phosphorescent light-emitting material;
- the material of the second light-emitting sublayer includes a second host material and a second doping material, and the second doping material includes a phosphorescent light-emitting material.
- the first doping material includes an iridium (III) complex
- the second doping material includes a platinum (II) complex
- the ligands of the iridium (III) complex and the platinum (II) complex are both multidentate ligands of organic compounds.
- the ligand of the iridium (III) complex includes at least an organic compound containing a dibenzofuran substituent.
- the ligand of the iridium (III) complex includes at least a deuterium group.
- the iridium (III) complex comprises any one of the following compounds:
- the ligand of the platinum (II) complex includes an organic compound containing a phenol oxide anion group.
- the ligand of the platinum (II) complex includes one of a substituted aromatic heterocycle, a substituted heteroaromatic ring and a substituted condensed ring, and the substituted aromatic heterocycle includes at least a tertiary Butyl or deuterated tert-butyl.
- the platinum (II) complex comprises any one of the following compounds:
- the first light-emitting layer further includes: a hole injection layer located between the first electrode and the first light-emitting sublayer, and a hole transport layer located between the first light-emitting sublayer and the hole injection layer;
- the second light-emitting sublayer further includes: an electron injection layer located between the second electrode and the second light-emitting sublayer, and an electron transport layer located between the second light-emitting sublayer and the electron injection layer.
- the present application further provides a display panel, the display panel comprising a light emitting device, wherein the light emitting device comprises:
- a substrate a first electrode, disposed on the substrate;
- a light-emitting functional layer is arranged on a side of the first electrode away from the substrate, and the light-emitting functional layer includes a first light-emitting layer, a charge generation layer and a second light-emitting layer which are arranged on the first electrode in sequence.
- the first light-emitting layer includes a first light-emitting sublayer
- the second light-emitting layer includes a second light-emitting sublayer
- a second electrode is arranged on a side of the second light-emitting layer away from the charge generating layer;
- the triplet lifetime of the material of the first luminescent sublayer is greater than the triplet lifetime of the material of the second luminescent sublayer, and the luminescence efficiency of the material of the first luminescent sublayer is less than the luminescence efficiency of the material of the second luminescent sublayer.
- the first light-emitting sublayer includes a first host material and a first doping material, and the first doping material includes a phosphorescent light-emitting material;
- the material of the second light-emitting sublayer includes a second host material and a second doping material, and the second doping material includes a phosphorescent light-emitting material.
- the first doping material includes an iridium (III) complex
- the second doping material includes a platinum (II) complex
- the ligands of the iridium (III) complex and the platinum (II) complex are both multidentate ligands of organic compounds.
- the ligand of the iridium (III) complex includes at least an organic compound containing a dibenzofuran substituent.
- the ligand of the iridium (III) complex includes at least a deuterium group.
- the iridium (III) complex comprises any one of the following compounds:
- the ligand of the platinum (II) complex comprises Organic compounds containing phenolic anion groups.
- the ligand of the platinum (II) complex includes one of a substituted aromatic heterocycle, a substituted heteroaromatic ring and a substituted condensed ring, and the substituted aromatic heterocycle includes at least a tert-butyl group or a deuterated tert-butyl group.
- the platinum (II) complex comprises any one of the following compounds:
- the first light-emitting layer further includes: a hole injection layer located between the first electrode and the first light-emitting sublayer, and a hole transport layer located between the first light-emitting sublayer and the hole injection layer;
- the second light-emitting sublayer further includes: an electron injection layer located between the second electrode and the second light-emitting sublayer, and an electron transport layer located between the second light-emitting sublayer and the electron injection layer.
- a light-emitting device and a display panel comprising: a substrate; a first electrode, arranged on the substrate; a light-emitting functional layer, arranged on a side of the first electrode away from the substrate, the light-emitting functional layer comprises a first light-emitting layer, a charge generation layer and a second light-emitting layer arranged on the first electrode in sequence, the first light-emitting layer comprises a first light-emitting sublayer, and the second light-emitting layer comprises a second light-emitting sublayer; the second electrode is arranged on a side of the second light-emitting layer away from the charge generation layer; wherein the triplet lifetime of the material of the first light-emitting sublayer is greater than the triplet lifetime of the material of the second light-emitting sublayer, and the luminous efficiency of the material of the first light-emitting sublayer is less than the luminous efficiency of the material of the second light-
- the inventor finds that the first light-emitting sublayer has a greater decisive influence on the lifetime than the second light-emitting sublayer, and the second light-emitting sublayer has a greater decisive influence on the luminous efficiency than the first light-emitting sublayer, and by cooperating with the first light-emitting sublayer with a longer lifetime and the second light-emitting sublayer with a higher luminous efficiency, the light-emitting device has both the effects of long lifetime and high luminous efficiency, so that the lifetime and brightness of the light-emitting device are greatly improved.
- FIG1 is a simulation result showing the contribution of two light-emitting sublayers to the luminous efficiency in a red light-emitting device
- FIG2 is a simulation result of the contribution of two light-emitting sublayers to the luminous efficiency in a green light-emitting device
- FIG3 is a simulation result of the contribution of two light-emitting sublayers to the luminous efficiency in a blue light-emitting device
- FIG4 is a measured result of the contribution of two light-emitting sublayers to the luminous efficiency in a red light-emitting device
- FIG5 is a measured result of the contribution of two light-emitting sublayers to the luminous efficiency in a green light-emitting device
- FIG6 is a measured result of the contribution of two light-emitting sublayers to the luminous efficiency in a blue light-emitting device
- FIG7 is a schematic cross-sectional view of a light emitting device 100 provided in an embodiment of the present application.
- FIG8 is a diagram showing the lifespan measurement results of the improved green light emitting device in the present application.
- FIG. 9 is a schematic diagram of a display panel 200 provided in an embodiment of the present application.
- An embodiment of the present application provides a light-emitting device, which includes: a substrate; a first electrode, arranged on the substrate; a light-emitting functional layer, arranged on a side of the first electrode away from the substrate, the light-emitting functional layer including a first light-emitting layer, a charge generation layer and a second light-emitting layer, which are arranged in sequence on the first electrode, the first light-emitting layer including a first light-emitting sublayer, and the second light-emitting layer including a second light-emitting sublayer; a second electrode, arranged on a side of the second light-emitting layer away from the charge generation layer; wherein the triplet lifetime of the material of the first light-emitting sublayer is greater than the triplet lifetime of the material of the second light-emitting sublayer, and the luminescence efficiency of the material of the first light-emitting sublayer is less than the luminescence efficiency of the material of the second light-emitting sublayer.
- the embodiments of the present application further provide a display panel including the above-mentioned light-emitting device, which will be described in detail below. It should be noted that the description order of the following embodiments is not intended to limit the preferred order of the embodiments.
- the brightness can theoretically reach twice that of a traditional light-emitting device. Similarly, at the same brightness, the lifespan can reach twice that of a traditional light-emitting device.
- the brightness of a tandem light-emitting device is only about 1.6 times that of a traditional light-emitting device, which limits the application of tandem light-emitting device products. Please refer to Figures 1 to 6.
- Figure 1 is a simulation result of the contribution of two light-emitting sublayers to the luminous efficiency in a red light-emitting device
- Figure 2 is a simulation result of the contribution of two light-emitting sublayers to the luminous efficiency in a green light-emitting device.
- Figure 3 is the simulation results of the contribution of the two light-emitting sublayers to the luminous efficiency in a blue light-emitting device
- Figure 4 is the measured results of the contribution of the two light-emitting sublayers to the luminous efficiency in a red light-emitting device
- Figure 5 is the measured results of the contribution of the two light-emitting sublayers to the luminous efficiency in a green light-emitting device
- Figure 6 is the measured results of the contribution of the two light-emitting sublayers to the luminous efficiency in a blue light-emitting device.
- the condition “R-reference” indicates that both luminescent sublayers in the red light-emitting device emit light
- the condition “R-EML1” indicates that only the first luminescent sublayer in the red light-emitting device emits light
- the condition “R-EML2” indicates that only the second luminescent sublayer in the red light-emitting device emits light
- the condition “G-reference” indicates that both luminescent sublayers in the green light-emitting device emit light
- the condition “G-EML1” indicates that only the first luminescent sublayer in the green light-emitting device emits light
- the condition “G-EML2” indicates that only the second luminescent sublayer in the green light-emitting device emits light
- the condition “B-reference” indicates that both luminescent sublayers in the blue light-emitting device emit light
- the condition “B-EML1” indicates that only the first luminescent sublayer in the blue light-emitting device emits light
- the luminous efficiency in the series light-emitting device is less than the sum of the luminous efficiency of the first light-emitting sublayer and the luminous efficiency of the second light-emitting sublayer, and the second light-emitting sublayer contributes more to the luminous efficiency of the series light-emitting device than the first light-emitting sublayer. This phenomenon is particularly prominent in green light-emitting devices.
- the luminous efficiency in the series light-emitting device is less than the sum of the luminous efficiency of the first light-emitting sublayer and the luminous efficiency of the second light-emitting sublayer, and the second light-emitting sublayer contributes more to the luminous efficiency of the series light-emitting device than the first light-emitting sublayer. This phenomenon is particularly prominent in green light-emitting devices.
- the simulation results of Figures 1 to 3 and the measured results of Figures 4 to 6 all show that the second light-emitting sublayer contributes more to the luminous efficiency of the light-emitting device 100 or the display panel 200 than the first light-emitting sublayer.
- the inventors also found that the first light-emitting sublayer contributes more to the life of the light-emitting device 100 or the display panel 200 than the second light-emitting sublayer.
- FIG. 7 is a schematic diagram of a cross-sectional structure of a light emitting device 100 provided in an embodiment of the present application.
- the embodiment of the present application provides a light emitting device 100, which includes a substrate 10, a first electrode 11, a light emitting functional layer 230 and a second electrode 12; the first electrode 11 is disposed on the substrate 10; the light emitting functional layer 230 Layer 230 is arranged on the side of the first electrode 11 away from the substrate 10, and the light-emitting functional layer 230 includes a first light-emitting layer 20, a charge generation layer 40 and a second light-emitting layer 30 arranged in sequence on the first electrode 11, the first light-emitting layer 20 includes a first light-emitting sublayer 21, and the second light-emitting layer 30 includes a second light-emitting sublayer 31; the second electrode 12 is arranged on the side of the second light-emitting layer 30 away from the charge generation layer 40; wherein the triplet lifetime of the material of the first light-emitting sublayer 21 is greater than the triplet lifetime of the material of the second light-emitting sublayer 31, and the luminescence efficiency of the material of the first
- the light emitting device 100 includes an anode and a cathode arranged opposite to each other, the first electrode 11 can be the anode, and the second electrode 12 can be the cathode.
- the first light emitting layer 20 and the second light emitting layer 30 are arranged in series between the first electrode 11 and the second electrode 12, and the second electrode 12 is arranged on a side of the first light emitting layer 20 away from the first electrode 11.
- the second light-emitting layer 30 contributes more to the luminous efficiency of the light-emitting device 100 or the display panel 200 than the first light-emitting layer 20, the luminous efficiency of the material of the first light-emitting sublayer 21 is lower than the luminous efficiency of the material of the second light-emitting sublayer 31, or the luminous efficiency of the material of the second light-emitting sublayer 31 is higher than the luminous efficiency of the material of the first light-emitting sublayer 21.
- Providing a second light-emitting layer 30 with high luminous efficiency can greatly improve the luminous efficiency of the light-emitting device 100 or the display panel 200.
- the light-emitting device 100 or the display panel 200 has both a long life and a high light-emitting efficiency, so that the life and brightness of the light-emitting device 100 or the display panel 200 are greatly improved.
- the inventors found that the first luminous sublayer 21 has a greater decisive influence on the lifespan than the second luminous sublayer 31, and the second luminous sublayer 31 has a greater decisive influence on the luminous efficiency than the first luminous sublayer 21.
- the light-emitting device 100 has the effects of both a long lifespan and a high luminous efficiency, so that the lifespan and brightness of the light-emitting device 100 are improved. The degree has been greatly improved.
- the first light-emitting sublayer 21 includes a first host material and a first doping material, the first doping material includes a phosphorescent material; the material of the second light-emitting sublayer 31 includes a second host material and a second doping material, the second doping material includes a phosphorescent material.
- phosphorescent material when a phosphorescent material emits light, all excitons formed in a singlet excited state or a triplet excited state can participate in the light emission. Most phosphorescent doped materials can achieve rapid decay from a singlet state to a triplet state to achieve light emission. Compared with fluorescent materials, the light emission efficiency of phosphorescent materials is greatly improved.
- the first doping material includes a first phosphorescent material; the second doping material includes a second phosphorescent material; the life of the first phosphorescent material is greater than the life of the second phosphorescent material, and the luminous efficiency of the first phosphorescent material is less than the luminous efficiency of the second phosphorescent material.
- the life of the first phosphorescent material is greater than the life of the second phosphorescent material, so that the life of the first light-emitting layer 20 is greater than the life of the second light-emitting layer 30.
- the luminous efficiency of the first phosphorescent material is less than the luminous efficiency of the second phosphorescent material, so that the luminous efficiency of the first light-emitting layer 20 is less than the luminous efficiency of the second light-emitting layer 30.
- the doping volume percentage of the first doping material is 4% to 12%.
- the doping volume percentage of the second doping material is 4% to 12%.
- the first doping material includes an iridium (III) complex
- the second doping material includes a platinum (II) complex
- the ligands of the iridium (III) complex and the platinum (II) complex are both organic compound multidentate ligands.
- the iridium ligand material is composed of a metal-centered iridium (Ir) ion and three bidentate ligands with unit negative charge.
- This hexacoordinated metal iridium complex presents an octahedral configuration in space.
- this type of material also has corresponding disadvantages, that is, it is easy to form self-quenching after film formation (i.e. self-stacking), resulting in low luminous efficiency of the light-emitting device, but the iridium ligand material has a higher quantum efficiency and a shorter triplet lifetime, and has its own natural advantages in lifetime.
- the platinum metal ions in the platinum (Pt) ligand material have a d8 configuration electronic configuration, so the platinum ligand material always tends to form a planar quadrilateral geometric configuration.
- LLCT Ligand to Ligand Charge Transfer
- MLCT Metal to Ligand Charge Transfer
- MMLCT Metal to Metal Charge Transfer
- dd* metal-center charge transfer
- the ligand of the iridium (III) complex includes at least an organic compound containing a dibenzofuran substituent.
- the radiative deactivation rate of the triplet excited state of dibenzofuran is slow, and by adjusting the degree of spin-orbit coupling and vibrational coupling, part of the triplet state can be allowed to transform into the singlet state, thereby improving the lifetime.
- the ligand of the iridium(III) complex includes at least a deuterium group.
- the substituent of the ligand of the iridium ligand material includes deuterium.
- the carbon-deuterium bond is shorter than the carbon-hydrogen bond, has a larger bond energy, and is more stable, which can maximize the life of the light-emitting device 100.
- the iridium (III) complex comprises any of the following compounds:
- the ligand of the platinum (II) complex comprises an organic compound containing a phenoxide anion group.
- the phenoloxy anion group is a strong field ligand, which can increase the MLCT (Metal to Ligand Charge Transfer) of the molecule after its introduction, thereby improving the luminescence efficiency.
- MLCT Metal to Ligand Charge Transfer
- the phenoxide anion group can be represented as Ph-O ⁇ .
- the ligand of the platinum (II) complex includes one of a substituted aromatic heterocycle, a substituted heteroaromatic ring, and a substituted condensed ring, and the substituted aromatic heterocycle includes at least a tert-butyl group or a deuterated tert-butyl group.
- the terminal tert-butyl group can reduce the effect of the ⁇ - ⁇ conjugated bond between molecules, thereby avoiding the TTA (triplet-triplet annihilation) effect and improving the luminous efficiency of the molecules of the platinum ligand material in the light-emitting device.
- a tert-butyl group needs to be introduced into the aromatic heterocyclic ring or the condensed ring, because the ⁇ - ⁇ stacking of the condensed ring is large and will quench the light.
- the introduction of the tert-butyl group is to separate the condensed ring between the two molecules.
- the LUMO mainly falls on the electron-withdrawing group, and the condensed ring is a larger electron-withdrawing group.
- the platinum (II) complex comprises any of the following compounds:
- the first light-emitting layer 20 also includes: a hole injection layer 22 located between the first electrode 11 and the first light-emitting sublayer 21, and a hole transport layer 23 located between the first light-emitting sublayer 21 and the hole injection layer 22;
- the second light-emitting layer 30 also includes: an electron injection layer 32 located between the second electrode 12 and the second light-emitting sublayer 31, and an electron transport layer 33 located between the second light-emitting sublayer 31 and the electron injection layer 32.
- the first light-emitting layer 20 may further include a first electron transport layer 24 between the charge generation layer 40 and the first light-emitting sublayer 21
- the second light-emitting layer 30 may further include a first hole transport layer 34 between the charge generation layer 40 and the second light-emitting sublayer 31 .
- the first light-emitting layer 20 and the second light-emitting layer 30 may have any structure in the prior art, which is not limited here.
- the light emitting device 100 further includes a charge generation layer 40 located between the first light emitting layer 20 and the second light emitting layer 30 .
- the charge generation layer 40 can transfer holes and/or electrons between the first light-emitting layer 20 and the second light-emitting layer 30, thereby realizing independent light emission of the first light-emitting layer 20 and the second light-emitting layer 30, thereby improving the current efficiency of the light-emitting device 100, and the lifespan and light-emitting efficiency of the light-emitting device 100 are both improved.
- the present application tests the luminous efficiency and triplet lifetime of the prior art and the technical solution implemented in the present application. Please refer to Table 1 and FIG8 for the specific results.
- the structures of the light-emitting devices of the prior art and the improved technical solution of the present application are the same, except that the materials of the first light-emitting layer 20 and the second light-emitting layer 30 in the light-emitting device in the prior art are the same, while the improved green light-emitting device uses the light-emitting device in the above embodiment, and the doping volume percentage of the first doping material is 4% to 12%, and the doping volume percentage of the second doping material is 4% to 12%.
- Table 1 compares the measured luminous efficiency and life data of an improved green light-emitting device in the prior art and the present application;
- FIG. 8 is a graph showing the measured life results of the improved green light-emitting device in the present application.
- the first doping material in the improved green light-emitting device includes an iridium ligand material and the second doping material includes a platinum ligand material. It can be seen from Table 1 that, compared with the light-emitting device in the prior art, the luminous efficiency of the improved light-emitting device is improved to 105%, and the lifespan is improved to 139%, and the lifespan improvement is more significant.
- FIG. 9 is a schematic diagram of a display panel 200 provided in an embodiment of the present application.
- the present application also provides a display panel 200 , which includes the light emitting device 100 according to any one of the above embodiments.
- the display panel 200 includes a substrate 201 and a plurality of light emitting devices disposed on the substrate 201. 100.
- the plurality of light emitting devices 100 may all be white light emitting devices, and the display panel 200 may further include a color resist layer, and the color resist layer selectively transmits light emitted by the white light emitting devices to achieve color display.
- the plurality of light emitting devices 100 may include a red light emitting device, a green light emitting device and a blue light emitting device, and at least one of the red light emitting device, the green light emitting device and the blue light emitting device adopts the light emitting device 100 of any one of the above embodiments.
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Abstract
本申请公开了一种发光器件及显示面板，发光功能层包括依次设置在第一电极上的第一发光层、电荷产生层和第二发光层，第一发光层包括第一发光子层，第二发光层包括第二发光子层；其中，第一发光子层的材料的三重态寿命大于第二发光子层的材料的三重态寿命，第一发光子层的材料的发光效率小于第二发光子层的材料的发光效率。
Description
本申请涉及显示领域，具体涉及一种发光器件及显示面板。
有机发光显示面板(OLED)已经广泛用于人们生活中，例如手机、电脑、车载等的显示屏幕。随着显示技术的发展以及人们对显示技术的进步要求，人们对显示面板的亮度、寿命等显示品质要求越来越高，已经开发了具有双层发光单元的串联式发光器件(Tandem发光器件)，用以提升亮度、寿命等性能。
然而，当前的串联式发光器件仍然存在发光效率不够高，亮度达不到使用需求，发光器件的寿命(lifetime)不够长的问题。
本申请实施例提供了一种发光器件及显示面板，可以解决当前的串联式发光器件仍然存在的发光效率不够高，亮度达不到使用需求，发光器件的寿命(lifetime)不够长的问题。
本申请实施例提供了一种发光器件，其中，包括：
衬底；第一电极，设置在所述衬底上；
发光功能层，设置在所述第一电极远离所述衬底的一面，所述发光功能层包括依次设置在所述第一电极上的第一发光层、电荷产生层和第二发光层，所述第一发光层包括第一发光子层，所述第二发光层包括第二发光子层；
第二电极，设置在所述第二发光层远离所述电荷产生层的一面；
其中，所述第一发光子层的材料的三重态寿命大于所述第二发光子层的材
料的三重态寿命，所述第一发光子层的材料的发光效率小于所述第二发光子层的材料的发光效率。
可选的，在本申请的一些实施例中，其中，所述第一发光子层包括第一主体材料和第一掺杂材料，所述第一掺杂材料包括磷光发光材料；
所述第二发光子层的材料包括第二主体材料和第二掺杂材料，所述第二掺杂材料包括磷光发光材料。
可选的，在本申请的一些实施例中，其中，所述第一掺杂材料包括铱(III)配合物，所述第二掺杂材料包括铂(II)配合物，所述铱(III)配合物和所述铂(II)配合物的配体均为有机化合物多齿配体。
可选的，在本申请的一些实施例中，其中，所述铱(III)配合物的配体至少包括含有二苯并呋喃取代基的有机化合物。
可选的，在本申请的一些实施例中，其中，所述铱(III)配合物的配体至少包括氘基团。
可选的，在本申请的一些实施例中，其中，所述铱(III)配合物包括下述化合物中任一种：
可选的，在本申请的一些实施例中，其中，所述铂(II)配合物的配体包括含有酚氧负离子基团的有机化合物。
可选的，在本申请的一些实施例中，其中，所述铂(II)配合物的配体包括取代芳杂、取代杂芳环和取代稠环中的一种，所述取代的芳杂环上至少包括叔
丁基或氘代叔丁基。
可选的，在本申请的一些实施例中，其中，所述铂(II)配合物包括下述化合物中任一种：
可选的，在本申请的一些实施例中，其中，所述第一发光层还包括：位于所述第一电极与所述第一发光子层之间的空穴注入层，以及位于所述第一发光子层与所述空穴注入层之间的空穴传输层；
所述第二发光子层还包括：位于所述第二电极与所述第二发光子层之间的电子注入层，以及位于所述第二发光子层与所述电子注入层之间的电子传输层。
相应地，本申请还提供了一种显示面板，所述显示面板包括发光器件，其中，所述发光器件包括：
衬底；第一电极，设置在所述衬底上；
发光功能层，设置在所述第一电极远离所述衬底的一面，所述发光功能层包括依次设置在所述第一电极上的第一发光层、电荷产生层和第二发光层，所
述第一发光层包括第一发光子层，所述第二发光层包括第二发光子层；
第二电极，设置在所述第二发光层远离所述电荷产生层的一面；
其中，所述第一发光子层的材料的三重态寿命大于所述第二发光子层的材料的三重态寿命，所述第一发光子层的材料的发光效率小于所述第二发光子层的材料的发光效率。
可选的，在本申请的一些实施例中，其中，所述第一发光子层包括第一主体材料和第一掺杂材料，所述第一掺杂材料包括磷光发光材料；
所述第二发光子层的材料包括第二主体材料和第二掺杂材料，所述第二掺杂材料包括磷光发光材料。
可选的，在本申请的一些实施例中，其中，所述第一掺杂材料包括铱(III)配合物，所述第二掺杂材料包括铂(II)配合物，所述铱(III)配合物和所述铂(II)配合物的配体均为有机化合物多齿配体。
可选的，在本申请的一些实施例中，其中，所述铱(III)配合物的配体至少包括含有二苯并呋喃取代基的有机化合物。
可选的，在本申请的一些实施例中，其中，所述铱(III)配合物的配体至少包括氘基团。
可选的，在本申请的一些实施例中，其中，所述铱(III)配合物包括下述化合物中任一种：
可选的，在本申请的一些实施例中，其中，所述铂(II)配合物的配体包括
含有酚氧负离子基团的有机化合物。
可选的，在本申请的一些实施例中，其中，所述铂(II)配合物的配体包括取代芳杂、取代杂芳环和取代稠环中的一种，所述取代的芳杂环上至少包括叔丁基或氘代叔丁基。
可选的，在本申请的一些实施例中，其中，所述铂(II)配合物包括下述化合物中任一种：
可选的，在本申请的一些实施例中，其中，所述第一发光层还包括：位于所述第一电极与所述第一发光子层之间的空穴注入层，以及位于所述第一发光子层与所述空穴注入层之间的空穴传输层；
所述第二发光子层还包括：位于所述第二电极与所述第二发光子层之间的电子注入层，以及位于所述第二发光子层与所述电子注入层之间的电子传输层。
本申请中，提供了一种发光器件及显示面板，发光器件包括：衬底；第一电极，设置在衬底上；发光功能层，设置在第一电极远离衬底的一面，发光功能层包括依次设置在第一电极上的第一发光层、电荷产生层和第二发光层，第一发光层包括第一发光子层，第二发光层包括第二发光子层；第二电极，设置在第二发光层远离电荷产生层的一面；其中，第一发光子层的材料的三重态寿命大于第二发光子层的材料的三重态寿命，第一发光子层的材料的发光效率小于第二发光子层的材料的发光效率。本申请，通过在发光器件中使用更高寿命的第一发光子层，在发光器件中使用更高发光效率的第二发光子层，发明人发现第一发光子层相比于第二发光子层对寿命具有更大决定性影响，第二发光子层相比于第一发光子层对发光效率具有更大决定性影响，通过具有更长寿命的第一发光子层与具有更高发光效率的第二发光子层配合，使得发光器件同时具有长寿命和高发光效率的效果，使得发光器件的寿命和亮度均得到极大提升。
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为红色发光器件中两个发光子层对发光效率的贡献的仿真结果；
图2为绿色发光器件中两个发光子层对发光效率的贡献的仿真结果；
图3为蓝色发光器件中两个发光子层对发光效率的贡献的仿真结果；
图4为红色发光器件中两个发光子层对发光效率的贡献的实测结果；
图5为绿色发光器件中两个发光子层对发光效率的贡献的实测结果；
图6为蓝色发光器件中两个发光子层对发光效率的贡献的实测结果；
图7为本申请实施例提供的一种发光器件100的一种截面结构示意图；
图8是本申请中改进后绿色发光器件的寿命实测结果图；
图9本申请实施例提供的一种显示面板200的示意图。
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。此外，应当理解的是，此处所描述的具体实施方式仅用于说明和解释本申请，并不用于限制本申请。在本申请中，在未作相反说明的情况下，使用的方位词如“上”和“下”通常是指装置实际使用或工作状态下的上和下，具体为附图中的图面方向；而“内”和“外”则是针对装置的轮廓而言的。
本申请实施例提供了一种发光器件，发光器件包括：衬底；第一电极，设置在衬底上；发光功能层，设置在第一电极远离衬底的一面，发光功能层包括依次设置在第一电极上的第一发光层、电荷产生层和第二发光层，第一发光层包括第一发光子层，第二发光层包括第二发光子层；第二电极，设置在第二发光层远离电荷产生层的一面；其中，第一发光子层的材料的三重态寿命大于第二发光子层的材料的三重态寿命，第一发光子层的材料的发光效率小于第二发光子层的材料的发光效率。
本申请的实施例还提供了一种包含上述发光器件的显示面板，以下分别进行详细说明。需说明的是，以下实施例的描述顺序不作为对实施例优选顺序的限定。
在串联式发光器件中，理论上亮度可以达到传统发光器件的两倍，同理，同一亮度下，寿命即可以达到传统发光器件的两倍。但实际上，串联式发光器件的亮度因为微腔效应及表面等离子体效应(SPPS)的损失，串联式发光器件的亮度仅为传统发光器件的1.6倍左右，使得串联式发光器件产品的应用受到了限制。请参阅图1至图6，图1为红色发光器件中两个发光子层对发光效率的贡献的仿真结果；图2为绿色发光器件中两个发光子层对发光效率的贡献
的仿真结果；图3为蓝色发光器件中两个发光子层对发光效率的贡献的仿真结果；图4为红色发光器件中两个发光子层对发光效率的贡献的实测结果；图5为绿色发光器件中两个发光子层对发光效率的贡献的实测结果；图6为蓝色发光器件中两个发光子层对发光效率的贡献的实测结果。条件“R-参考”表示红色发光器件中两个发光子层均发光，条件“R-EML1”表示红色发光器件中仅第一发光子层发光，条件“R-EML2”表示红色发光器件中仅第二发光子层发光；条件“G-参考”表示绿色发光器件中两个发光子层均发光，条件“G-EML1”表示绿色发光器件中仅第一发光子层发光，条件“G-EML2”表示绿色发光器件中仅第二发光子层发光；条件“B-参考”表示蓝色发光器件中两个发光子层均发光，条件“B-EML1”表示蓝色发光器件中仅第一发光子层发光，条件“B-EML2”表示蓝色发光器件中仅第二发光子层发光。
从图1至图3的仿真结果中可以发现，串联式发光器件中发光效率小于第一发光子层的发光效率和第二发光子层的发光效率之和，且第二发光子层对串联式发光器件的发光效率贡献较第一发光子层大，此现象在绿色发光器件中表现尤为突出。
从图4至图6的实测结果中可以发现，串联式发光器件中发光效率小于第一发光子层的发光效率和第二发光子层的发光效率之和，且第二发光子层对串联式发光器件的发光效率贡献较第一发光子层大，此现象在绿色发光器件中表现尤为突出。
图1至图3的仿真结果和图4至图6的实测结果均说明了第二发光子层对发光器件100或显示面板200的发光效率的贡献大于第一发光子层上。此外，发明人还发现：第一发光子层对发光器件100或显示面板200的寿命的贡献大于第二发光子层。
实施例一
请参阅图7，图7为本申请实施例提供的一种发光器件100的一种截面结构示意图。
本申请实施例提供了一种发光器件100，发光器件100包括衬底10、第一电极11、发光功能层230和第二电极12；第一电极11设置在衬底10上；发光功能
层230设置在第一电极11远离衬底10的一面，发光功能层230包括依次设置在第一电极11上的第一发光层20、电荷产生层40和第二发光层30，第一发光层20包括第一发光子层21，第二发光层30包括第二发光子层31；第二电极12设置在第二发光层30远离电荷产生层40的一面；其中，第一发光子层21的材料的三重态寿命大于第二发光子层31的材料的三重态寿命，第一发光子层21的材料的发光效率小于第二发光子层31的材料的发光效率。
具体地，发光器件100包括相对设置的阳极和阴极，第一电极11可以为阳极，第二电极12可以为阴极。第一发光层20和第二发光层30串联设置在第一电极11与第二电极12之间，第二电极12设置在第一发光层20远离第一电极11的一侧。
具体地，发明人发现：第一发光层20对发光器件100或显示面板200的寿命的贡献大于第二发光层30，第一发光子层21的材料的三重态寿命大于第二发光子层31的材料的三重态寿命，设置长寿命的第一发光层20，可以极大的提升了发光器件100或显示面板200的寿命。
具体地，发明人发现：第二发光层30对发光器件100或显示面板200的发光效率的贡献大于第一发光层20，第一发光子层21的材料的发光效率小于第二发光子层31的材料的发光效率，或第二发光子层31的材料的发光效率大于第一发光子层21的材料的发光效率，设置高发光效率的第二发光层30，可以极大的提升了发光器件100或显示面板200的发光效率。
具体地，通过具有更长寿命的第一发光层20与具有更高发光效率的第二发光层30配合，使得发光器件100或显示面板200同时具有长寿命和高发光效率的效果，使得发光器件100或显示面板200的寿命和亮度均得到极大的提升。
在本实施例中，通过在发光器件100中使用更高寿命的第一发光子层21，在发光器件100中使用更高发光效率的第二发光子层31，发明人发现第一发光子层21相比于第二发光子层31对寿命具有更大决定性影响，第二发光子层31相比于第一发光子层21对发光效率具有更大决定性影响，通过具有更长寿命的第一发光子层21与具有更高发光效率的第二发光子层31配合，使得发光器件100同时具有长寿命和高发光效率的效果，使得发光器件100的寿命和亮
度均得到极大提升。
在一些实施例中，第一发光子层21包括第一主体材料和第一掺杂材料，第一掺杂材料包括磷光发光材料；第二发光子层31的材料包括第二主体材料和第二掺杂材料，第二掺杂材料包括磷光发光材料。
具体地，磷光发光材料发光时，以单重激发态或三重激发态形成的所有激子均可以参与发光，大多数的磷光掺杂材料都能实现单重态到三重态的迅速衰变实现发光，磷光发光材料与荧光发光材料相比，其发光效率极大提高。
具体地，进一步地，第一掺杂材料包括第一磷光发光材料；第二掺杂材料包括第二磷光发光材料；第一磷光发光材料的寿命大于第二磷光发光材料的寿命，第一磷光发光材料的发光效率小于第二磷光发光材料的发光效率。第一磷光发光材料的寿命大于第二磷光发光材料的寿命，使得第一发光层20的寿命大于第二发光层30的寿命。第一磷光发光材料的发光效率小于第二磷光发光材料的发光效率，使得第一发光层20的发光效率小于第二发光层30的发光效率。
进一步地，第一掺杂材料的掺杂体积百分比为4％～12％。
进一步地，第二掺杂材料的掺杂体积百分比为4％～12％。
在一些实施例中，第一掺杂材料包括铱(III)配合物，第二掺杂材料包括铂(II)配合物，铱(III)配合物和铂(II)配合物的配体均为有机化合物多齿配体。
具体地，铱配体材料是由一个金属中心铱(Ir)离子和三个带单位负电荷的双齿配体组成。这种六配位的金属铱配合物在空间上呈现出八面体构型。但该类材料也有相应的弊端，就是容易在成膜(即自堆积)后形成自猝灭，导致发光器件发光效率低，但铱配体材料拥有较高的量子效率及较短的三重态寿命，在寿命上有其自身天然的优势。
具体地，铂(Pt)配体材料中铂金属离子拥有一个d8的构型电子组态，所以说铂配体材料总倾向去构成平面四边形的几何构型，在磷光发射过程中存在若干种不同的高效激发态：LLCT(Ligand to Ligand Charge Transfer，配体-配体电荷转移)、MLCT(Metal to Ligand Charge Transfer，金属-配体电荷转移)、MMLCT(Metal to Metal Charge Transfer，金属-金属电荷抓你)和单体中金属中心电荷转移(dd*)激发态，使发光器件的发光效率增强。
在一些实施例中，铱(III)配合物的配体至少包括含有二苯并呋喃取代基的有机化合物。
具体地，二苯并呋喃的三重激发态的辐射失活速率较慢，通过调节自旋轨道耦合和振动耦合的程度，可以允许部分的三重态向单重态转变，从而提高寿命。
在一些实施例中，铱(III)配合物的配体至少包括氘基团。
具体地，铱配体材料的配体的取代基包括氘，碳-氘键较碳-氢键更短，键能更大，更为稳定，可以最大化提升发光器件100的寿命。
在一些实施例中，铱(III)配合物包括下述化合物中任一种：
在一些实施例中，铂(II)配合物的配体包括含有酚氧负离子基团的有机化合物。
具体地，酚氧负离子基团是强场配体，引入后可以增加分子的MLCT(Metal to Ligand Charge Transfer，金属-配体电荷转移)，从而提升发光效率。
具体地，酚氧负离子基团可以表示为Ph-O-。
在一些实施例中，铂(II)配合物的配体包括取代芳杂、取代杂芳环和取代稠环中的一种，取代的芳杂环上至少包括叔丁基或氘代叔丁基。
具体地，末端含叔丁基可以减小分子间的π-π共轭键作用，从而避免TTA(三线态-三线态湮灭)效应，提升铂配体材料的分子在发光器件中的发光效率。
具体地，芳杂环或稠环上需要引入叔丁基，因为稠环的π-π堆积较大，会猝灭光，引入叔丁基就是为了隔开两个分子之间的稠环。另外，LUMO主要落在吸电子基上，而稠环是较大的吸电子基。
在一些实施例中，铂(II)配合物包括下述化合物中任一种：
在一些实施例中，第一发光层20还包括：位于第一电极11与第一发光子层21之间的空穴注入层22，以及位于第一发光子层21与空穴注入层22之间的空穴传输层23；第二发光层30还包括：位于第二电极12与第二发光子层31之间的电子注入层32，以及位于第二发光子层31与电子注入层32之间的电子传输层33。
具体地，第一发光层20还可以包括电荷产生层40与第一发光子层21之间的第一电子传输层24，第二发光层30还可以包括电荷产生层40与第二发光子层31之间的第一空穴传输层34。
具体地的，第一发光层20和第二发光层30可以为现有技术中任一种结构，在此不限定。
进一步地，在一些实施例中，发光器件100还包括位于第一发光层20和第二发光层30之间的电荷产生层40。
具体地，当从第一电极11或/和第二电极12注入载流子，电荷产生层40能够在第一发光层20和第二发光层30之间传递空穴或/和电子，实现第一发光层20和第二发光层30独立的发光，提升了发光器件100的电流效率，发光器件100的寿命和发光效率均得到提升。
实验数据说明：
本申请对现有技术和本申请实施的技术方案进行发光效率和三重态寿命的检测，具体结果参阅表格1和图8。
现有技术和本申请改进的技术方案的发光器件的结构相同，不同之处在于现有技术中发光器件中第一发光层20和第二发光层30材料相同，而改进后的绿色发光器件使用上述实施例中的发光器件，第一掺杂材料的掺杂体积百分比为4％～12％，第二掺杂材料的掺杂体积百分比为4％～12％。
表格1对比了现有技术和本申请一种改进后绿色发光器件的实测发光效率和寿命数据；图8是本申请中改进后绿色发光器件的寿命实测结果图。
可以看出，改进后的绿色发光器件中第一掺杂材料包括铱配体材料且第二掺杂材料包括铂配体材料，从表格1中可以看出，相比于现有技术的发光器件，改进后的发光器件的发光效率提升至了105％，寿命提升至了139％，寿命提升更加显著。
表格1，发光效率和寿命实测数据
实施例二
请参阅图9，图9本申请实施例提供的一种显示面板200的示意图。
本申请还提供了一种显示面板200，显示面板200包括上述实施例中任一项的发光器件100。
具体地，显示面板200包括基底201和设置于基底201上的多个发光器件
100。
具体地，多个发光器件100可以均为白光发光器件，显示面板200还可以包括色阻层，通过色阻层选择性透过白光发光器件发出的光线，实现彩色显示。
具体地，多个发光器件100可以包括红光发光器件、绿光发光器件和蓝光发光器件，红光发光器件、绿光发光器件和蓝光发光器件中至少一种采用上述实施例中的任一项的发光器件100。
以上对本申请实施例所提供的一种发光器件及显示面板进行了详细介绍，本文中应用了具体个例对本申请的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本申请的方法及其核心思想；同时，对于本领域的技术人员，依据本申请的思想，在具体实施方式及应用范围上均会有改变之处，综上所述，本说明书内容不应理解为对本申请的限制。
Claims (20)
- 一种发光器件，其中，包括：衬底；第一电极，设置在所述衬底上；发光功能层，设置在所述第一电极远离所述衬底的一面，所述发光功能层包括依次设置在所述第一电极上的第一发光层、电荷产生层和第二发光层，所述第一发光层包括第一发光子层，所述第二发光层包括第二发光子层；第二电极，设置在所述第二发光层远离所述电荷产生层的一面；其中，所述第一发光子层的材料的三重态寿命大于所述第二发光子层的材料的三重态寿命，所述第一发光子层的材料的发光效率小于所述第二发光子层的材料的发光效率。
- 如权利要求1所述的发光器件，其中，所述第一发光子层包括第一主体材料和第一掺杂材料，所述第一掺杂材料包括磷光发光材料；所述第二发光子层的材料包括第二主体材料和第二掺杂材料，所述第二掺杂材料包括磷光发光材料。
- 如权利要求2所述的发光器件，其中，所述第一掺杂材料包括铱(III)配合物，所述第二掺杂材料包括铂(II)配合物，所述铱(III)配合物和所述铂(II)配合物的配体均为有机化合物多齿配体。
- 如权利要求3所述的发光器件，其中，所述铱(III)配合物的配体至少包括含有二苯并呋喃取代基的有机化合物。
- 如权利要求3所述的发光器件，其中，所述铱(III)配合物的配体至少包括氘基团。
- 如权利要求3所述的发光器件，其中，所述铱(III)配合物包括下述化合物中任一种：
- 如权利要求3所述的发光器件，其中，所述铂(II)配合物的配体包括含有酚氧负离子基团的有机化合物。
- 如权利要求3所述的发光器件，其中，所述铂(II)配合物的配体包括取代芳杂、取代杂芳环和取代稠环中的一种，所述取代的芳杂环上至少包括叔丁基或氘代叔丁基。
- 如权利要求3所述的发光器件，其中，所述铂(II)配合物包括下述化合物中任一种：
- 如权利要求3所述的发光器件，其中，所述第一发光层还包括：位于所述第一电极与所述第一发光子层之间的空穴注入层，以及位于所述第一发光子层与所述空穴注入层之间的空穴传输层；所述第二发光子层还包括：位于所述第二电极与所述第二发光子层之间的电子注入层，以及位于所述第二发光子层与所述电子注入层之间的电子传输层。
- 一种显示面板，包括发光器件，其中，所述发光器件包括：衬底；第一电极，设置在所述衬底上；发光功能层，设置在所述第一电极远离所述衬底的一面，所述发光功能层包括依次设置在所述第一电极上的第一发光层、电荷产生层和第二发光层，所述第一发光层包括第一发光子层，所述第二发光层包括第二发光子层；第二电极，设置在所述第二发光层远离所述电荷产生层的一面；其中，所述第一发光子层的材料的三重态寿命大于所述第二发光子层的材料的三重态寿命，所述第一发光子层的材料的发光效率小于所述第二发光子层的材料的发光效率。
- 如权利要求11所述的显示面板，其中，所述第一发光子层包括第一主体材料和第一掺杂材料，所述第一掺杂材料包括磷光发光材料；所述第二发光子层的材料包括第二主体材料和第二掺杂材料，所述第二掺杂材料包括磷光发光材料。
- 如权利要求12所述的显示面板，其中，所述第一掺杂材料包括铱(III)配合物，所述第二掺杂材料包括铂(II)配合物，所述铱(III)配合物和所述铂(II)配合物的配体均为有机化合物多齿配体。
- 如权利要求13所述的显示面板，其中，所述铱(III)配合物的配体至少包括含有二苯并呋喃取代基的有机化合物。
- 如权利要求13所述的显示面板，其中，所述铱(III)配合物的配体至少包括氘基团。
- 如权利要求13所述的显示面板，其中，所述铱(III)配合物包括下述化合物中任一种：
- 如权利要求13所述的显示面板，其中，所述铂(II)配合物的配体包括含有酚氧负离子基团的有机化合物。
- 如权利要求13所述的显示面板，其中，所述铂(II)配合物的配体包括取代芳杂、取代杂芳环和取代稠环中的一种，所述取代的芳杂环上至少包括叔丁基或氘代叔丁基。
- 如权利要求13所述的显示面板，其中，所述铂(II)配合物包括下述化合物中任一种：
- 如权利要求13所述的显示面板，其中，所述第一发光层还包括：位于所述第一电极与所述第一发光子层之间的空穴注入层，以及位于所述第一发光子层与所述空穴注入层之间的空穴传输层；所述第二发光子层还包括：位于所述第二电极与所述第二发光子层之间的电子注入层，以及位于所述第二发光子层与所述电子注入层之间的电子传输层。
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| CN114665034A (zh) * | 2020-12-24 | 2022-06-24 | 乐金显示有限公司 | 发光装置和包括该发光装置的发光显示装置 |
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- 2023-03-31 CN CN202310350820.2A patent/CN117460279A/zh active Pending
- 2023-05-12 WO PCT/CN2023/093753 patent/WO2024198053A1/zh not_active Ceased
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| WO2005101912A1 (ja) * | 2004-04-14 | 2005-10-27 | Konica Minolta Holdings, Inc. | 有機エレクトロルミネッセンス素子、表示装置及び照明装置 |
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