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Organic electroluminescence 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 short life and low luminous efficiency of devices, achieve good performance, good transmission performance, improve luminous efficiency and The effect of service life

Inactive Publication Date: 2019-04-19
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, in the current stage of thermally activated delayed fluorescence devices, there are often situations where the device has low luminous efficiency and short life.

Method used

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  • Organic electroluminescence device and display device
  • Organic electroluminescence device and display device
  • Organic electroluminescence device and display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-10

[0062] Such as image 3 As shown, each of Embodiments 1-10 provides an organic electroluminescent device, which successively includes an anode, a hole injection layer (HIL), a hole transport layer (HTL), an electron blocking layer (EBL), and an emission layer (EML). , electron transport layer (ETL), electron injection layer (EIL) and cathode.

[0063] The device structure of embodiment 1 is ITO / HATCN (10nm) / NPB (40nm) / electron barrier (5nm) / host: 30%T-6:5%F-8 (30nm) / TPBI (30nm) / LiF (1nm ) / Al(200nm).

[0064] The device structure of Examples 2-10 is basically the same as that of Example 1, the only difference lies in the materials and / or doping concentrations of the light emitting layer and the electron blocking layer.

[0065] In the organic electroluminescent devices provided in Examples 1-10, the specific selection and doping concentration of materials for the light-emitting layer and the electron blocking layer, and the test results of the corresponding organic electrolum...

Embodiment 11-14

[0080] Such as image 3 As shown, Examples 11-14 respectively provide an organic electroluminescent device, the device structure is basically the same as that of Example 1, the difference is only that the doping concentration of the sensitizer in the light-emitting layer is different, and the specific concentration of the sensitizer in the light-emitting layer is different. The doping concentration and the test results of the corresponding organic electroluminescent devices are shown in Table 3.

[0081] table 3

[0082]

[0083] From the test results in Table 3 combined with Table 2, it can be seen that as the doping concentration of the TADF material used as a sensitizer in the light-emitting layer changes, the luminous efficiency and service life of the corresponding OLED device also change accordingly. In comparison, when the doping concentration of the TADF material in the light-emitting layer is 10-50 wt%, the OLED device has relatively better luminous efficiency and...

Embodiment 15-18

[0086] Such as image 3 As shown, Embodiments 15-18 respectively provide an organic electroluminescent device, the device structure is basically the same as that of Embodiment 2, the only difference lies in the thickness of the electron blocking layer. Table 4 shows the thickness of the electron blocking layer in Examples 15-18 and the test results of the corresponding organic electroluminescent devices.

[0087] From Table 4 and in conjunction with the test results of the aforementioned Examples 1-14, it can be seen that when the light-emitting layer uses TADF material as the sensitizer, and the electron blocking layer contains TADF material, as the thickness of the electron blocking layer changes, the luminous efficiency of the OLED device and service life have changed. When the thickness of the electron blocking layer is 1-50nm, the luminous efficiency of the OLED device is relatively high and the service life is relatively long, especially when the thickness of the electr...

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Abstract

The invention provides an organic electroluminescence device and a display device, and the organic electroluminescence device comprises a light-emitting layer and an electron blocking layer, wherein the material of the light-emitting layer comprises a host material, a guest material and a first thermally activated delayed fluorescence material; the material of the electron blocking layer comprisesa second thermally-activated delayed fluorescent material. The TADF material is used in the electron blocking layer while the TADF material is adopted in the light-emitting layer as the sensitizer, so that the light-emitting efficiency of the organic electroluminescence device can be improved, and the service life of the organic electroluminescence device is prolonged.

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] An organic electroluminescent device is provided with a light-emitting layer between the electron transport layer and the hole transport layer, and a cathode and an anode are further arranged on the side of the electron transport layer and the hole transport layer away from the light-emitting layer, respectively, and the device is supplied with an external voltage. A device that injects electrons and holes into the light-emitting layer and recombines to form excitons in the light-emitting layer, and emits photons 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 d...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L27/32
CPCH10K59/00H10K50/12H10K50/18H10K50/11
Inventor 李国孟孙磊魏金贝李梦真
Owner YUNGU GUAN TECH CO LTD
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