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Organic EL device and preparation method

A component and organic technology, applied in the field of organic EL components, can solve problems such as complicated manufacturing process and deterioration

Inactive Publication Date: 2008-12-24
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] However, the treatment of low work function metals and their salts is still necessary, and at the same time, the production process is complicated, and there are still problems about deterioration

Method used

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  • Organic EL device and preparation method
  • Organic EL device and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0253] An ITO (indium tin oxide) anode (200 nm thick) with a sheet resistance of 15 Ω / □ was formed on a glass substrate, and Baytron P (manufactured by Bayer Corporation: polyethylene dioxide thiophene) and poly Polymer mixed aqueous dispersion of styrene sulfonic acid) was spin-coated with a 40 nm thick hole injection layer.

[0254] Next, a hole-transporting light-emitting layer is formed. The hole-transporting light-emitting layer was a 40-nm-thick layer obtained by dissolving a polyarylfluorene derivative (compound represented by formula (P-2)) in toluene and spin-coating. The concentration of the coating liquid is 1.5% (mass percentage).

[0255] In the next step, an electron-injecting organic layer is formed by spin coating. Using ethyl cellosolve as a solvent, make a mixture of oxadiazole derivative (exemplary compound E-1) 50mol% and mono(acetylacetonate) sodium complex (Na(acac):exemplary compound C-1) 50mol% Dissolved and spin-coated to form a 10 nm thick layer. ...

Embodiment 2

[0260] In the electron-injecting organic layer, the exemplary compound E-1 of the oxadiazole derivative was replaced with the exemplary compound E-2 (polymer), and the ethyl cellosolve was replaced with dimethylacetamide. Others were the same as in Example 1. An organic EL element was obtained. The organic EL element obtained in this way is at 10mA / cm 2 The brightness is 1500cd / m 2 (3.7V), get green light, at 10mA / cm 2 The brightness half-life under constant current driving (under Ar gas) is 500 hours.

Embodiment 3

[0262] In the electron-injecting organic layer, replace the exemplary compound E-1 of the oxadiazole derivative with the exemplary compound E-18 (thiadiazole derivative), replace the ethyl cellosolve with dimethylacetamide, and the others are the same as in the embodiment 1. Prepare an organic EL element. The organic EL element obtained in this way is at 10mA / cm 2 The brightness is 2000cd / m 2 (3.7V), get green light, at 10mA / cm 2 The brightness half-life under constant current driving (under Ar gas) is 500 hours.

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Abstract

In an organic EL device comprising a cathode, an anode, and two or more stacked organic layers therebetween including a light emitting layer, an electron injecting organic layer containing an organic salt or complex of a metal having a standard electrode potential of more negative than -1.8 V at 25 DEG C. is formed close to the cathode by coating, and an organic layer containing a high molecular weight EL material is disposed close to the electron injecting organic layer. A multilayer structure of organic layers can be formed by coating, and the organic EL device has a high luminance, high efficiency, high reliability, long life and ease of handling. Besides, at least one organic layer except for the light emitting layer contains low polymer material and high polymer material.

Description

[0001] This application is a divisional application of the Chinese patent application number 02129872.6, the filing date is August 20, 2002, and the title of the invention is "Organic EL element and its manufacturing method". technical field [0002] The present invention relates to an organic EL element characterized by lamination of organic layers formed by a coating method, in particular to an organic EL element with high reliability and high efficiency. . A method for producing an organic EL device having an amorphous film. Also, the present invention relates to an organic EL device using a metal salt of a metal that has not been used as a cathode (electron injection electrode) before. Background technique [0003] Since the announcement of the multilayer organic EL device produced by Kodatsuku Co., Ltd. by the vacuum deposition method, the development of organic EL displays has been flourishing, and it has been put into practical use. [0004] In such an organic EL dev...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L51/54H01L51/00C09K11/06
Inventor 神户江美子新海正博
Owner TDK CORPARATION