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Organic light-emitting layer ink, preparation method and light-emitting layer forming method

An organic light-emitting layer, organic technology, applied in the field of OLED, can solve problems such as the destruction of the light-emitting layer, and achieve the effect of reducing the efficiency roll-off and avoiding mutual dissolution

Inactive Publication Date: 2022-05-24
JIHUA HENGYE (FOSHAN) ELECTRONIC MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The selection of organic materials in the light-emitting layer electronic ink is a difficult point in the current inkjet printing OLED process. The materials used need to be able to dissolve, and there are certain viscosity requirements and tension requirements when preparing the solution. After these requirements are met, the selection of materials and solvents has been There are not many, and the properties of these materials are similar, so there is a problem. When printing OLED devices, it is necessary to print multiple layers. When printing the next layer of ink, it is easy to dissolve with the printed ink of the previous layer. Most of the layer materials can be dissolved in the same solvent, which often causes damage to the light-emitting layer when printing the electron transport layer

Method used

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  • Organic light-emitting layer ink, preparation method and light-emitting layer forming method
  • Organic light-emitting layer ink, preparation method and light-emitting layer forming method
  • Organic light-emitting layer ink, preparation method and light-emitting layer forming method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Weigh each component of the organic light-emitting layer ink according to the mass fraction; including 4.5% of the cross-linked organic host material, wherein the mass fraction of the hole-type organic host material is 3.6%, and the mass fraction of the electronic organic host material is 0.9%; 0.5% of miscellaneous luminescent material; 5% of regulator, wherein the mass fraction of viscosity regulator is 4%, the mass fraction of surface tension regulator is 1%; solvent 90%.

[0050] The hole-type organic host material is H1 above, the electron-type organic host material is E3 above, the organic doped light-emitting material is D7 above, the surface tension regulator is hydroquinone, and the viscosity regulator is o-methoxybenzene. Methyl formate, the main solvent is o-dichlorobenzene.

[0051] The weighed cross-linked organic host material and the organic doped luminescent material were dissolved in a solvent, and heated and stirred at 60° C. for 1 hour during the diss...

Embodiment 2

[0056] The components of the organic light-emitting layer ink are provided according to the mass fraction; including 3% of the cross-linked organic host material, of which the mass fraction of the hole-type organic host material is 1.8%, and the mass fraction of the electronic organic host material is 1.2%; organic doping 0.6% luminescent material; 3% regulator, 2% mass fraction of viscosity regulator, 1% mass fraction of surface tension regulator; 93.4% solvent.

[0057] The hole-type organic host material is H2 above, the electron-type organic host material is E1 above, the organic doped light-emitting material is D1 above, the surface tension regulator is cumene, and the viscosity regulator is diphenyl ether. The solvent is methyl benzoate.

[0058] The weighed cross-linked organic host material and the organic doped luminescent material were dissolved in a solvent, and heated and stirred at 80° C. for 30 minutes during the dissolution process to obtain a first mixed soluti...

Embodiment 3

[0063] The components of the organic light-emitting layer ink are provided according to the mass fraction; including 6.4% of cross-linked organic host materials, of which the mass fraction of hole-type organic host materials is 3.2%, and the mass fraction of electronic-type organic host materials is 3.2%; organic doping 1.6% of luminescent material; 5% of regulator, wherein the mass fraction of viscosity regulator is 3%, the mass fraction of surface tension regulator is 2%; solvent 87%.

[0064] The hole-type organic host material is H6 above, the electron-type organic host material is E5 above, the organic doped light-emitting material is D6 above, the surface tension modifier is phenol, the viscosity modifier is diphenyl ether, and the main solvent is cyclo Hexylbenzene.

[0065] The weighed cross-linked organic host material and the organic doped luminescent material were dissolved in a solvent, and heated and stirred at 80° C. for 1 hour during the dissolution process to o...

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Abstract

The invention discloses organic light-emitting layer ink, a preparation method and a light-emitting layer forming method, and belongs to the field of OLED (organic light-emitting diode). The ink comprises the following components in percentage by mass: 3-30% of organic main body material, 0.1-6% of organic doped light-emitting material, 0-10% of regulator and 54-96.9% of solvent, the organic main body material comprises a hole type organic main body material containing a cross-linking group and an electronic type organic main body material containing a cross-linking group, the ink can generate thermal cross-linking at 100-200 DEG C, the temperature range has no adverse effect on other layers of the OLED, a light-emitting layer after cross-linking has the characteristic of solvent resistance, mutual dissolution of the light-emitting layer and other layers can be avoided, and the light-emitting effect of the OLED is improved. The electron transport layer of the OLED can be prepared through solution processing, and the hole-type organic main body material and the electron-type organic main body material are jointly used as organic main body materials, so that the efficiency roll-off of the light-emitting layer can be effectively reduced.

Description

technical field [0001] The invention relates to an ink for an organic light-emitting layer, a preparation method, and a method for forming a light-emitting layer, belonging to the field of OLEDs. Background technique [0002] Organic Light-Emitting Diode (OLED, Organic Light-Emitting Diode) is a high-quality display device. Compared with traditional display methods such as cathode ray tube display and liquid crystal display, OLED display has many advantages, such as low driving voltage, display High luminous efficiency, fast response, lighter and thinner, wider display viewing angle, higher contrast and display clarity, etc. Therefore, OLED display methods are gradually replacing the current mainstream liquid crystal display methods. OLED is widely used in mobile phones, computers, TVs, etc. has more and more applications. OLED display devices are generally composed of anode, hole injection layer (HIL), hole transport layer (HTL), light emitting layer (ETL), electron transp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/38C09D11/50C09D11/36H01L51/50H01L51/54H01L51/56
CPCC09D11/38C09D11/50C09D11/36H10K71/135H10K50/12H10K71/00Y02E10/549
Inventor 庄旭鸣梁宝炎梁洁毕海王悦
Owner JIHUA HENGYE (FOSHAN) ELECTRONIC MATERIALS CO LTD
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