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Organic electroluminescent 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 problems such as poor color purity, low device efficiency, and efficiency roll-off, and achieve the suppression of DET energy transfer, device The effect of improving efficiency and stability and reducing efficiency roll-off

Active Publication Date: 2019-05-28
YUNGU GUAN TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of TADF materials in the light-emitting layer often leads to serious efficiency roll-off, low device efficiency and poor color purity.

Method used

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  • Organic electroluminescent device and display device
  • Organic electroluminescent device and display device
  • Organic electroluminescent device and display device

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Experimental program
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Effect test

preparation example Construction

[0037] Considering that the preparation of the light-emitting layer at this stage mostly adopts evaporation contact technology, such as multi-source co-evaporation, so in this embodiment, the resonant TADF material with a molecular weight of 200-2000 is preferred to avoid resulting in difficulty in vapor deposition.

[0038] As a way to control the molecular weight of the resonant TADF material, a can be limited to an integer of 1 to 6, that is, the resonant TADF material of this embodiment can include 1 to 6 1 , M 2 unit.

[0039] In this embodiment, as the resonance type TADF material of the dye, in particular, at least one of the compounds F-1 to F-29 with the following general formulas can be selected to improve the luminous efficiency of the organic electroluminescent device and reduce the efficiency roll-off:

[0040]

[0041]

[0042] Wherein, R is independently selected from hydrogen, halogen, cyano, C 1 ~C 10 Alkyl, C 2 ~C 6 Alkenyl, C 1 ~C 6 Alkoxy or t...

Embodiment 1-9

[0080] Embodiments 1-9 respectively provide an organic electroluminescent device, and the device structure is ITO / NPB (40nm) / TCTA (10nm) / double light-emitting layer / TPBI (30nm) / LiF (1nm) / Al (100nm), However, the materials and thicknesses of the double light-emitting layers are different. The material composition of the specific double light-emitting layer is shown in Table 1.

[0081] Table 1

[0082]

[0083]

[0084] The organic electroluminescent device in the above-mentioned embodiment is measured as follows: Under the same brightness, use Keithley K 2400 digital source meter and PR 655 spectral scanning luminance meter to measure the turn-on voltage and current efficiency of the organic electroluminescent device, and then calculate The external quantum efficiency of the device under different brightness, the half-maximum width FWHM is 1000cd / m 2 Next measure. Among them, when the voltage is increased at a rate of 0.1V per second, when the brightness of the organi...

Embodiment 5

[0104] It can be seen that, adopting the technical scheme of double light-emitting layers in this embodiment, using bulk exciplexes and interfacial complexes as host materials, using TADF materials as sensitizers, and using resonant TADF materials as dyes, can significantly Improve the external quantum efficiency of the device and improve the performance of the device.

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Abstract

The invention provides an organic electroluminescent device and a display device. The organic light-emitting device comprises a first light-emitting layer and a second light-emitting layer, wherein the material of the first light-emitting layer comprises a first main body material, a first sensitizer and a first dye, and the material of the second light-emitting layer comprises a second main bodymaterial, a third main body material, a second sensitizer and a second dye; the first main body material can form an exciplex with the second main body material or the third main body material, and the second main body material can form an exciplex with the third main body material; the first sensitizer and the second sensitizer are both thermally activated delayed fluorescent materials; the firstdye and the second dye are both resonance type thermal activation delayed fluorescence materials. According to the light-emitting layer of the organic light-emitting device provided by the invention,the interface exciplex and the bulk phase exciplex are used as main body materials, and the TADF material is used as a sensitizer to sensitize the resonant TADF material, so that the efficiency roll-off is remarkably reduced, and the device efficiency and stability are remarkably improved.

Description

technical field [0001] The invention relates to an organic electroluminescence device and a display device, belonging to the technical field of organic electroluminescence. Background technique [0002] Organic Light Emitting Diode (OLED) is a device that is driven by current to achieve the purpose of emitting light, and its main characteristics come from the light-emitting layer therein. When an appropriate voltage is applied, electrons and holes will combine in the light-emitting layer to generate excitons and emit light. [0003] At present, the luminescent dyes used in the light-emitting layer are mainly traditional fluorescent materials and phosphorescent materials. Traditional fluorescent materials can only use 25% of singlet excitons to emit light, and the low luminous efficiency is not conducive to reducing device power consumption. Although phosphorescent materials can achieve a maximum internal quantum efficiency of 100%, they are expensive and easy to cause envi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H01L51/54
Inventor 魏金贝李国孟李维维李梦真
Owner YUNGU GUAN TECH CO LTD
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