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Organic electrofluorescence device and display device

An electroluminescent device and a luminescent technology, which are applied in the direction of electric solid-state devices, electrical components, semiconductor devices, etc., can solve problems such as low lifespan and large device efficiency roll-off, and achieve cost reduction, omission of electronic barrier layers, Reduce the effect of the evaporation chamber

Active Publication Date: 2020-03-24
KUNSHAN GO VISIONOX OPTO ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, thermally activated delayed fluorescence (TADF) electroluminescent devices often have a large roll-off in device efficiency and a low lifetime.

Method used

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  • Organic electrofluorescence device and display device
  • Organic electrofluorescence device and display device
  • Organic electrofluorescence device and display device

Examples

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preparation example Construction

[0079] The invention also provides a preparation method of the organic electroluminescence device, which comprises sequentially depositing a first electrode, an organic layer and a second electrode on a substrate, and then encapsulating. Wherein, when preparing the light-emitting layer, the method of multi-source co-evaporation can be used to adjust the evaporation rate of the host material and the evaporation rate of the dye so that the dye reaches a preset doping ratio. By adopting the device structure of the present application, one evaporation chamber can be reduced in actual mass production, which greatly simplifies the evaporation process steps and reduces the cost.

[0080] 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 a display device such as an OLED display, and any product or component having a display function such as a TV, a digit...

Embodiment 1-31、 comparative example 3-4

[0083]Embodiments 1-28 and Comparative Examples 3-4 respectively provide an organic electroluminescence device, and its device structure includes an ITO anode, a hole injection layer (HIL), a hole transport layer (HTL), and an emissive layer (EML) successively. , hole blocking layer (HBL), electron transport layer (ETL), electron injection layer (EIL) and cathode.

[0084] Wherein, the material of the hole injection layer is HI-3, and the thickness is 2nm. The material of the hole transport layer is HT-28 with a thickness of 30 nm. The material of the luminescent layer includes a host material, a sensitizer and a fluorescent dye, and the thickness of the luminescent layer is 30nm. The material of the hole blocking layer is HB-4, and the thickness is 5 nm. The material of the electron transport layer is ET-52, and the thickness is 25nm. The material of the electron injection layer is LiQ (1nm), and the material of the cathode is Al (150nm).

[0085] The preparation methods ...

Embodiment 29

[0101] The difference from Example 3 is that the doping concentration of the fluorescent dye F-30 is 0.1wt%, the doping concentration of the sensitizer T-93 is 15wt%, and the thickness of the light-emitting layer is 10nm.

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Abstract

The invention relates to an organic electrofluorescence device and a display device. The organic electrofluorescence device comprises a first electrode, a second electrode and an organic layer locatedbetween the first electrode and the second electrode. The organic layer comprises a light-emitting layer and does not comprise an electron blocking layer; the light-emitting layer contains a host material, a thermal activation delayed fluorescence sensitizer and a fluorescent dye; the triplet state energy level of the host material is higher than the triplet state energy levels of the thermal activation delayed fluorescence sensitizer and the fluorescent dye, and the LUMO energy level of the host material is higher than the LUMO energy levels of the thermal activation delayed fluorescence sensitizer and the fluorescent dye. By using the host material with higher triplet state energy level and LUMO energy level, carriers of the light emitting layer are effectively prevented from entering other transmission layers, an electron blocking layer can be omitted, and finally, the device has high light emitting efficiency and low driving voltage.

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] In the Thermally Activated Delayed Fluorescence (TASF, Thermally Activated Sensitized Fluorescence) system, when the TADF material is used as a sensitizer, the energy of the host material is transferred to the TADF material, and then its triplet energy passes through the reverse intersystem crossing (RISC) process. Return to the singlet state, and then transfer the energy to the dye to emit light, so that the complete energy transfer from the host to the dye molecule can be realized, so that the traditional fluorescent doped dye can also break through the 25% internal quantum efficiency limit. [0003] Currently, in thermally activated delayed fluorescence (TADF) electroluminescent devices, the device efficiency roll-off is large and the lifetime is low. [0004] Therefo...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L27/32
CPCH10K59/00H10K50/11H10K2101/40H10K50/12
Inventor 李国孟魏金贝孙磊徐超
Owner KUNSHAN GO VISIONOX OPTO ELECTRONICS CO LTD