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Organic electroluminescent device and preparation method thereof

An electroluminescent device, electroluminescent technology, applied in the direction of electric solid device, semiconductor/solid state device manufacturing, electrical components, etc., can solve the problems of ultra-high vacuum conditions, unsuitable for large-scale production, etc., to achieve high material utilization, suitable for The effect of large-scale production and a wide range of choices

Inactive Publication Date: 2018-08-31
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still two main problems in the vacuum thermal evaporation method: on the one hand, this preparation process requires ultra-high vacuum conditions, which is not suitable for large-scale production
However, most solvents are mutually soluble, and it is still difficult to obtain multiple stacked and completely delaminated organic layers by the solution method.

Method used

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  • Organic electroluminescent device and preparation method thereof
  • Organic electroluminescent device and preparation method thereof
  • Organic electroluminescent device and preparation method thereof

Examples

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preparation example Construction

[0030] The method for preparing the above-mentioned organic electroluminescent device is characterized in that it comprises the following steps:

[0031] ①Use de-detergent, deionized water, acetone and ethanol solutions to ultrasonically clean the substrate with the anode layer in sequence, and put it in an oven for drying after cleaning.

[0032] ② On the anode layer, the hole injection layer, the hole transport layer, the light-emitting layer and the electron transport layer are sequentially prepared by a wet process method, and then moved into a vacuum coating chamber to prepare the cathode layer to obtain an organic electroluminescent device. Preferably, the hole injection layer, the hole transport layer, the light-emitting layer and the electron transport layer are sequentially prepared on the anode layer of the substrate through a wet process, and the wet process can take spin coating, dip coating, inkjet printing, roll coating , one or more of LB films. The cathode lay...

Embodiment 1

[0042] Such as figure 1 As shown, the hole injection layer 3 in the device structure is PEDOT:PSS, the hole transport layer 4 is TAPC, the host material in the yellow light emitting layer 5 is CBP, and the guest material is a yellow light emitting material emitterY with thermally activated delayed fluorescence characteristics, Its electron donor is a phenothiazine group, the electron acceptor is a benzophenone group, and the doping mass ratio is a guest material: host material=10%, the material used for the electron transport layer 6 is TPBI, and the cathode layer is Mg:Ag Alloy, the ratio is 10:1. The entire device structure is described as:

[0043] Glass substrate / ITO / PEDOT:PSS(40nm) / TAPC(20nm) / CBP:10% emitterY(20nm) / TPBI(40nm) / Mg:Ag(10:1, 100nm)

[0044] The preparation method is as follows:

[0045] (1) Use detergent, deionized water, acetone and ethanol solutions to ultrasonically clean the transparent conductive substrate ITO glass, and put it in an oven for drying a...

Embodiment 2

[0058] Such as figure 1 As shown, the hole injection layer 3 in the device structure is PEDOT:PSS, the hole transport layer 4 is TAPC, the host material in the blue light-emitting layer 5 is, and the guest material is a blue light-emitting material emitterB with thermally activated delayed fluorescence characteristics. The electron donor is an acridine group, the electron acceptor is a diphenyl sulfone group, the doping mass ratio is guest material: host material=50%, the material used for the electron transport layer 6 is DPEPO, and the cathode layer is Mg:Ag alloy, The ratio is 10:1. The entire device structure is described as:

[0059] Glass substrate / ITO / PEDOT:PSS(40nm) / TAPC(60nm) / MCP:0.1%emitterB(20nm) / DPEPO(40nm) / Mg:Ag(10:1,100nm)

[0060] The preparation steps of the device are similar to those in Example 1.

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Abstract

The invention provides an organic electroluminescent device and a preparation method thereof; the organic electroluminescent device structure comprises the following parts in sequence from bottom to top: a substrate, an anode layer, an organic function layer and a cathode layer; the features are that the organic function layer comprises a cavity injection layer, a cavity transmission layer, a luminescent layer and an electron transmission layer arranged from bottom to top in sequence; the luminescent layer is a mixed structure formed by a main body material doping with an object body luminescent material; the luminescent material has thermal activation delayed fluorescence characteristics, and the doped mass ratio thereof is 1-50%; the cavity injection layer, the cavity transmission layer,the luminescent layer and the electron transmission layer are respectively formed by a wet method technology using a same solvent. The method uses the wet method technology to prepare the thermal activation delayed fluorescence device, thus improving the device efficiency, simplifying the device preparation technology, and reducing the production cost.

Description

technical field [0001] The invention relates to the field of organic photoelectric technology in electronic components, in particular to an organic electroluminescent device and a preparation method thereof. Background technique [0002] Organic light-emitting devices (OLEDs) are a new type of technology that can be widely used in various fields of daily production and life such as flat panel display, solid-state lighting, liquid crystal display backlight and flexible transparent display. OLED has the advantages of self-luminescence, high efficiency, and green environmental protection, which can meet the current world's requirements for energy conservation, low-carbon environmental protection, and green life. [0003] In the OLED device structure, the luminescent material is an important component, which plays a key role in determining the device performance. Throughout the development history of OLED light-emitting materials, the first generation of organic fluorescent mat...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L51/52H01L51/56
CPCH10K50/80H10K50/00H10K71/00
Inventor 陈晓洁杨湛赵娟杨志涌于涛池振国张艺刘四委许家瑞
Owner SUN YAT SEN UNIV
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