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Organic electroluminescent device and display device

An electroluminescent device and electroluminescent technology, which are applied in electric solid devices, electrical components, semiconductor devices, etc., can solve the problems of poor color purity, high exciton concentration, efficiency roll-off, etc., and improve the exciton utilization rate. , widening the composite area, reducing the effect of efficiency roll-off

Active Publication Date: 2019-02-22
YUNGU GUAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thermally activated delayed fluorescent dyes can achieve 100% internal quantum efficiency without metal, but the exciton concentration is too high under high voltage, the efficiency rolls off seriously and the spectrum is too broad, and the color purity is not good

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

[0078] The glass plate coated with the ITO transparent conductive layer was ultrasonically treated in a commercial cleaning agent, rinsed in deionized water, ultrasonically degreased in acetone: ethanol mixed solvent, baked in a clean environment until the water was completely removed, and treated with ultraviolet light. and ozone cleaning, and bombard the surface with a low-energy positive ion beam;

[0079] Place the above-mentioned glass substrate with the anode in a vacuum chamber and evacuate to 1×10 -5 ~9×10 -3Pa, the compound HI-2 was vacuum-evaporated on the above-mentioned anode layer as a hole injection layer, the evaporation rate was 0.1nm / s, and the evaporation film thickness was 10nm;

[0080] The compound HT-28 was vacuum evaporated on the surface of the hole injection layer as the hole transport layer of the device, the evaporation rate was 0.1nm / s, and the total film thickness was 40nm;

[0081] The first light-emitting layer of the device is vacuum-evaporate...

Embodiment 2～5

[0090] The preparation method of the organic electroluminescent device in Examples 2 to 5 is basically the same as that of Example 1, the only difference is that the material selection, doping concentration and / or thickness of the first light-emitting layer and the second light-emitting layer are different, specifically the first The materials, doping concentrations and thicknesses used for the light-emitting layer and the second light-emitting layer are shown in Table 3, and the materials and thicknesses of other functional layers are shown in Table 2.

[0091] Material, doping concentration and thickness of OLED device light-emitting layer in Table 3 Examples 2-5

[0092]

[0093] In Examples 2 to 5, the first sensitizer and the second sensitizer are different, and the first dye and the second dye are the same; for the specific structures of the first light-emitting layer and the second light-emitting layer, please refer to image 3 .

Embodiment 6～10

[0095] The preparation method of the organic electroluminescent device in Examples 6-10 is basically the same as that of Example 1, the only difference lies in the material selection, doping concentration and / or thickness of the first light-emitting layer and the second light-emitting layer. Specifically, the materials, doping concentrations and thicknesses used in the first light-emitting layer and the second light-emitting layer are shown in Table 4, and the materials and thicknesses of other functional layers can be found in Table 2.

[0096] Material, doping concentration and thickness of OLED device light-emitting layer in Table 4 Examples 6-10

[0097]

[0098] In Examples 6-10, the first dye and the second dye are different, and the specific structure of the first light-emitting layer and the second light-emitting layer in the OLED device can refer to Figure 4 .

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Abstract

The present invention provides an organic electroluminescent device and a display device. The organic electroluminescent device comprises a first luminescent layer and a second luminescent layer. Thematerial of the first luminescent layer comprises a first main material, a first sensitizer and a first dye. The material of the second luminescent layer comprises a second main material, a second sensitizer and a second dye. An exciplex can be formed between the first main material and the second main material. The first sensitizer and the second sensitizer are both thermally activated delayed fluorescent materials. The first dye and the second dye are both conventional fluorescent dyes. The organic electroluminescent device provided by the invention can improve device efficiency, reduces efficiency roll-off, and improves color purity.

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 electroluminescence devices (referred to as OLED devices) have attracted widespread attention due to many advantages such as self-luminescence, wide viewing angle, and high contrast. At present, the light-emitting layer of an organic electroluminescent device is generally composed of a host material doped with a dye, such as a host material doped with a traditional fluorescent dye. However, due to spin prohibition, traditional fluorescent materials can only utilize 25% of singlet excitons, and almost all triplet excitons are lost in the form of non-radiative transitions, so the external quantum efficiency is only limited to about 5%. . Therefore, making full use of triplet excitons is the most common way to improve the efficiency of organic electroluminescent devices. ...

Claims

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Application Information

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IPC IPC(8): H01L51/50
CPCH10K50/121H10K50/125
Inventor 魏金贝李国孟李维维李梦真何麟
Owner YUNGU GUAN TECH CO LTD
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