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Organic electroluminescent device and display device

An electroluminescent device and electroluminescent technology, which are applied in the direction of electro-solid devices, electrical components, semiconductor devices, etc., can solve the problems of low luminous efficiency and low lifespan of devices, and achieve the goal of improving luminous efficiency, reducing energy level barriers, improving Effect of Luminous Efficiency and Lifespan

Inactive Publication Date: 2019-02-26
YUNGU GUAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the use of TADF materials in the light-emitting layer of organic electroluminescent devices often has low luminous efficiency and low lifespan.

Method used

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  • Organic electroluminescent device and display device
  • Organic electroluminescent device and display device
  • Organic electroluminescent device and display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-7

[0054] Embodiments 1-7 respectively provide an organic electroluminescent device, such as figure 2 As shown, the device structure sequentially includes ITO anode, hole injection layer (HIL), hole transport layer (HTL), electron blocking layer (EBL), light emitting layer (EML), electron transport layer (ETL), electron injection layer (EIL) and cathode.

[0055] Wherein, the material of the hole injection layer is HATCN, and generally the total thickness is 5-30nm, which is 10nm in this embodiment. The material of the hole transport layer is a common material for HTL in OLEDs, NPB in this embodiment, and the total thickness is generally 5-500 nm, and 40 nm in this embodiment. The thickness of the electron blocking layer is generally 1-500nm, which is 5nm in this embodiment. The host material (Host) of the luminescent layer is consistent with the material of the electron blocking layer, the guest material is TADF material (TADF Emitter), and the doping concentration is 0.1-50w...

Embodiment 8-10

[0072] Embodiment 8-10 provides a kind of organic electroluminescent device respectively, and its device structure comprises ITO anode, hole injection layer (HIL), hole transport layer (HTL), electron blocking layer (EBL), light-emitting layer (EML) successively. ), electron transport layer (ETL), electron injection layer (EIL) and cathode, see for details image 3 . Among them, the host material (Host) of the light-emitting layer is the same as that of the electron blocking layer (EBL), and TADF material is used as the sensitizer of the light-emitting layer, and traditional fluorescent dyes are used as the guest material of the light-emitting layer (ie Fluorescent dyes). The materials and thicknesses used for other functional layers are consistent with those in Examples 1-7, the thickness of the light-emitting layer is 30 nm, and the thickness of the hole blocking layer is 5 nm.

[0073] Refer to Table 2 for the specific material selection and doping concentration of the lig...

Embodiment 11-14

[0082] Embodiments 11-14 respectively provide an organic electroluminescent device, the device structure of which is consistent with that of Embodiment 2, for details, please refer to figure 2 . The material and thickness used for each functional layer of the OLED device in Examples 11-14 are basically the same as those in Example 2, the only difference lies in the thickness of the electron blocking layer. The thicknesses of the electron blocking layers in Examples 11-14 are 1 nm, 10 nm, 100 nm and 150 nm respectively, and the performance test results of the corresponding OLED devices are shown in Table 3.

[0083] table 3

[0084]

[0085] It can be seen from Table 3 that when the host material of the light-emitting layer is consistent with the material used for the electron blocking layer, the luminous efficiency and lifetime of the organic electroluminescent device will change as the thickness of the electron blocking layer changes. From the test results of Examples 1...

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Abstract

The present invention provides an organic electroluminescent device and a display device. The organic electroluminescent device comprises a light-emitting layer and an electron blocking layer. The material of the light-emitting layer comprises a main body material, and the material of the electron blocking layer is the same as the main body material. According to the organic electroluminescent device provided by the invention, the same material is used as the main body material of the light-emitting layer and the electron blocking layer, the energy level barrier between the main body materialof the light-emitting layer and the material of the electron blocking layer in the device can be effectively reduced, the starting voltage of the device is reduced, the efficiency is improved, and theservice life of the device is improved.

Description

technical field [0001] The invention belongs to the field of display technology, and in particular relates to an organic electroluminescent device and a display device. Background technique [0002] Organic electroluminescent devices are provided with a light-emitting layer between the electron-transporting layer and the hole-transporting layer, and a cathode and an anode are further arranged outside it, and electrons and holes are injected into the device by an external voltage and recombine in the light-emitting layer to form an excitation layer. A photon, a device that emits photons and deactivates them through the process of fluorescence or phosphorescence. Because of its full solid state, self-illumination, wide viewing angle, fast response, low driving voltage, low energy consumption and many other characteristics, it has great application prospects in the field of display and lighting. [0003] In recent years, a new generation of thermally activated delayed fluoresc...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L27/32
CPCH10K59/10H10K50/121H10K50/12H10K50/18
Inventor 李国孟魏金贝李梦真李维维何麟
Owner YUNGU GUAN TECH CO LTD
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