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Organic light-emitting device and display device

An electroluminescent device, electroluminescent technology, applied in the direction of electro-solid devices, electrical components, semiconductor devices, etc., can solve the problems of low life, low efficiency, color shift of the screen, etc., to improve the life of the device, improve efficiency, improve The effect of the rollon phenomenon

Active Publication Date: 2020-11-13
KUNSHAN NEW FLAT PANEL DISPLAY TECH CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in TASF light-emitting devices, there are often the following problems: (1) the efficiency of the device is low when the brightness of the device is low. If this device structure is applied to the screen body, it is easy to have defects such as color shift of the screen body at low gray levels; (2) This kind of roll on phenomenon also often leads to a low life of the TASF light-emitting device

Method used

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  • Organic light-emitting device and display device
  • Organic light-emitting device and display device
  • Organic light-emitting device and display device

Examples

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preparation example Construction

[0077] The invention also provides a preparation method of the organic electroluminescence device, which comprises sequentially depositing an anode, a hole transport region, a light-emitting layer, an electron transport region and a cathode on a substrate, and then encapsulating. Wherein, when preparing the light-emitting layer, a multi-source co-evaporation method is used. The deposition methods of the anode, the hole transport region, the electron transport region and the cathode are the same as the existing methods in the art.

[0078] An embodiment of the present invention also provides a display device, which includes the organic electroluminescent device as provided above. Specifically, the display device may be an OLED display panel, and any product or component with a display function, such as a TV, a digital camera, a mobile phone, a tablet computer, etc. including the display panel. The display device has the same advantages as that of the above-mentioned organic el...

Embodiment 1-10

[0081] Embodiment 1-10, comparative example 1-3

[0082] The organic electroluminescent devices provided by Examples 1-10 and Comparative Examples 1-3 adopt a preparation method provided by the present invention, and the specific preparation method is as follows:

[0083] (1) The glass plate coated with the ITO transparent conductive layer is ultrasonically treated in a commercial cleaning agent, rinsed in deionized water, ultrasonically degreased in acetone: ethanol mixed solvent, and baked in a clean environment until the water is completely removed , cleaning with UV light and ozone, and bombarding the surface with a beam of low-energy cations;

[0084] (2) Place the above-mentioned glass substrate with the anode in a vacuum chamber, and evacuate to less than 1×10 -5 Pa, vacuum-deposit HI-3 on the above-mentioned anode layer film as a hole injection layer, the evaporation rate is 0.1nm / s, and the evaporation film thickness is 2nm;

[0085] (3) The hole transport layer HT-...

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Abstract

The invention relates to an organic light-emitting device and a display device. The organic light-emitting device comprises a first electrode, a second electrode and an organic layer located between the first electrode and the second electrode, wherein the organic layer comprises an electron blocking layer and a light emitting layer; the light emitting layer contains a host material, a thermal activation delayed fluorescence sensitizer and a boron-containing fluorescent dye, and the electron blocking layer contains an electron blocking material; the triplet state energy level of the host material is less than or equal to the triplet state energy level of the electron blocking material; and the LUMO energy level of the boron-containing fluorescent dye is less than or equal to the LUMO energy level of the electron blocking material. According to the invention, the specific dye is selected, and the energy level relationship among the host material, the dye and the electron blocking material is set, so that the efficiency of the device under low brightness is effectively improved, the phenomenon that the efficiency of the device is obviously improved along with the increase of the brightness is improved, and the service life of the device is prolonged.

Description

technical field [0001] The invention relates to the technical field of organic electroluminescence, in particular to an organic electroluminescence device and a display device. Background technique [0002] Thermally activated sensitized fluorescence (TASF) means that when thermally activated delayed fluorescence (TADF) materials are used as sensitizers, the energy of the host material is transferred to the TADF material, and then its triplet energy passes through the reverse intersystem crossing (RISC) The process returns to the singlet state, and then the energy is transferred to the doped fluorescent dye to emit light, which can realize the complete energy transfer from the host to the dye molecule, so that the traditional fluorescent doped dye can also break through the 25% internal quantum efficiency limit. [0003] However, in TASF light-emitting devices, there are often the following problems: (1) the efficiency of the device is low when the brightness of the device i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H01L51/56H01L27/32
CPCH10K59/00H10K50/12H10K50/11H10K2101/10H10K50/18H10K71/00
Inventor 李国孟席昭洋高孝裕李梦真李飞霞张义波
Owner KUNSHAN NEW FLAT PANEL DISPLAY TECH CENT