Organic electroluminescence device and display device

An electroluminescent device and luminescent technology, which is applied in the direction of electric solid-state devices, electrical components, semiconductor devices, etc., can solve the problems of low luminous efficiency and low life of devices, achieve good transmission performance, improve luminous efficiency and life, and prolong The effect of service life

Active Publication Date: 2019-04-19
YUNGU GUAN TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the thermally activated delayed fluorescence devices at the present stage, there are often situations where the device luminous efficiency is low and the lifetime is low.

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 1-11

[0062] Such as image 3 As shown, each of Embodiments 1-11 provides an organic electroluminescent device, which successively includes an anode, a hole injection layer (HIL), a hole transport layer (HTL), a light emitting layer (EML), a hole blocking layer (HBL) ), electron transport layer (ETL), electron injection layer (EIL) and cathode.

[0063] The device structure of embodiment 1 is ITO / HATCN (10nm) / NPB (40nm) / main body: 30%T-76:5%F-8 (30nm) / hole blocking (5nm) / TPBI (30nm) / LiF ( 1nm) / Al(200nm).

[0064] The device structure of Examples 2-11 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 hole blocking layer.

[0065] In the organic electroluminescent devices provided in Examples 1-11, the specific selection and doping concentration of the materials of the light-emitting layer and the hole blocking layer, and the test results of the corresponding organic electroluminesce...

Embodiment 12-15

[0080] Such as image 3 As shown, Examples 12-15 respectively provide an organic electroluminescence device, the device structure is basically the same as that of Example 1, the only difference is 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 1, 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. When the doping concentration of the TADF material in the light-emitting layer is 10-40wt%, the OLED device has relatively optimal luminous efficiency and service life....

Embodiment 16-19

[0086] Such as image 3 As shown, Examples 16-19 respectively provide an organic electroluminescence device, the structure of the device is basically the same as that of Example 2, the only difference lies in the thickness of the hole blocking layer. Table 4 shows the thickness of the hole blocking layer and the test results of the corresponding organic electroluminescent devices in specific examples 15-18.

[0087] From Table 4 and in conjunction with the test results of the aforementioned Examples 1-15, it can be known that when the light-emitting layer uses TADF material as the sensitizer, and the hole blocking layer contains TADF material, as the thickness of the hole blocking layer changes, the OLED device Both luminous efficiency and service life have changed. When the thickness of the hole 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 hole blocking la...

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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 a hole 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 hole blocking layer includes a secondthermally activated delayed fluorescence material. The TADF material is adopted in the light-emitting layer as the sensitizer, and meanwhile, the TADF material is used in the hole blocking layer, so that the light-emitting efficiency of the organic electroluminescence device can be improved, and the service life of the organic electroluminescence 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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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H01L27/32
CPCH10K59/10H10K50/121H10K50/18
Inventor 李国孟张跃威魏金贝李梦真
Owner YUNGU GUAN TECH CO LTD
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