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A kind of organic electroluminescent device and display device

An electroluminescent device and electroluminescent technology, applied in the direction of electric solid devices, electrical components, semiconductor devices, etc., can solve the problems of low lifespan and low luminous efficiency of devices, reduce energy level barriers, improve luminous efficiency, reduce The effect of turn-on voltage

Active Publication Date: 2021-11-16
YUNGU GUAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A kind of organic electroluminescent device and display device
  • A kind of organic electroluminescent device and display device
  • A kind of organic electroluminescent device and display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-8

[0055] Embodiments 1-8 respectively provide an organic electroluminescent device, such as figure 2 As shown, the device structure includes an ITO anode, a hole injection layer (HIL), a hole transport layer (HTL), an emission layer (EML), a hole blocking layer (HBL), an electron transport layer (ETL), and an electron injection layer. layer (EIL) and cathode.

[0056] 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 host material (Host) of the luminescent layer is consistent with the material of the hole blocking layer, the guest material is TADF material (TADFEmitter), and the doping concentration is 0.1-50wt%; the thickness of the luminescent layer is generally 1-200nm, and the present embodiment is 30nm ...

Embodiment 9-14

[0072] Embodiments 9-14 respectively provide an organic electroluminescent device, such as image 3 As shown, the device structure includes an ITO anode, a hole injection layer (HIL), a hole transport layer (HTL), an emission layer (EML), a hole blocking layer (HBL), an electron transport layer (ETL), and an electron injection layer. layer (EIL) and cathode. Wherein, the host material (Host) of the light-emitting layer is the same as that of the hole-blocking layer, and TADF material is used as a sensitizer of the light-emitting layer, and traditional fluorescent dyes are used as guest materials (ie Fluorescentdyes) of the light-emitting layer. The materials and thicknesses used for other functional layers are consistent with those in Examples 1-8, the thickness of the light-emitting layer is 30 nm, and the thickness of the hole blocking layer is 5 nm.

[0073] See Table 2 for the material selection and doping concentration of the specific light-emitting layer and the hole bl...

Embodiment 15-18

[0083] Embodiments 15-18 respectively provide an organic electroluminescent device, the device structure of which is consistent with that of Embodiments 1-8, for details, please refer to figure 2 . The material and thickness used for each functional layer of the OLED device in Examples 15-18 are basically the same as those in Example 2, and the only difference lies in the thickness of the hole blocking layer. The thicknesses of the hole blocking layers in Examples 15-18 are 1 nm, 10 nm, 50 nm and 100 nm respectively, and the performance test results of the corresponding OLED devices are shown in Table 3.

[0084] table 3

[0085]

[0086] It can be seen from Table 3 that when the host material of the light-emitting layer is consistent with the material of the hole-blocking layer, the luminous efficiency and lifespan of the organic electroluminescent device will change as the thickness of the hole-blocking layer changes. According to the test results of Examples 15-18 and...

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Abstract

The invention provides an organic electroluminescent device and a display device. The organic electroluminescent device comprises a light-emitting layer and a hole blocking layer, wherein: the material of the light-emitting layer includes a host material; the material constituting the hole blocking layer is the same as the host material. The organic electroluminescent device provided by the present invention uses the same material as the main material of the light-emitting layer and the hole blocking layer, which can effectively reduce the energy level barrier between the main body of the light-emitting layer and the hole blocking layer in the OLED device, and reduce the energy level of the device. The turn-on voltage improves the luminous efficiency and the life of the device at the same time.

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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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/50H01L51/54
CPCH10K50/121H10K50/12H10K50/18H10K50/11H10K2101/10
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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