Polythiophene compositions for improving organic light-emitting diodes

Inactive Publication Date: 2005-09-15
HERAEUS PRECIOUS METALS GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0024] It was surprisingly found that hitherto unknown formulations containing optionally substituted polyanilines or polypyrroles or specially substituted polythiophenes and polymers soluble in polar

Problems solved by technology

It has been found in practice however that these electrodes do not have a sufficient conductivity, especially for large area displays.
The service life of these displays is however still not sufficient for many practical applications.

Method used

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  • Polythiophene compositions for improving organic light-emitting diodes
  • Polythiophene compositions for improving organic light-emitting diodes
  • Polythiophene compositions for improving organic light-emitting diodes

Examples

Experimental program
Comparison scheme
Effect test

example 1

Production of a Polymer Containing 4˜(2,3-dihydrothieno[3,4-b][1,4]dioxin-2-ylmethoxy)-1-butanesulfonic acid) repeating units and 4-(3,4-dihydro-2H-thieno[3,4-b][1,4]dioxepin-3-yl)-1-butanesulfonic acid) repeating units (PEDT-S)

[0110] 17.5 g of EDT-S (mixture of 80% of 4-(2,3-dihydrothieno[3,4-b][1,4]dioxin-2-ylmethoxy)-1-butanesulfonic acid and 20% of 4-(3,4-dihydro-2H-thieno[3,4-b][1,4]dioxepin-3-yl)-1-butanesulfonic acid) as sodium salt were dissolved in 350 ml of water under a protective gas atmosphere (N2). 25.6 g of FeCl3 wre then added. The solution was next stirred for 2 hours at room temperature (=RT, 23° C.), then heated at 100° C. for 12 hours, and worked up after cooling to RT. For this, the solution was diluted with water to ca. 3 wt. % and deionised with 66 g each of Lewatit® S 100 (cation exchanger from Bayer Chemicals AG) and Lewatit® MP 62 (anion exchanger from Bayer Chemicals AG) by stirring for 4 hours at 23° C. This procedure was repeated a further three times. ...

example 2.1

[0112] 20 g of the PEDT-S solution prepared according to Example 1 with a solids content of 1.45 wt. % are mixed with 36.4 g of a 4.78 wt. % solution of Nafion® in a mixture of lower aliphatic alcohols and water (Nafion® perfluorinated ion-exchange resin, 5 wt % solution in lower aliphatic alcohols / H2O″, CAS-No. 66796-30-3, Aldrich Order No. 27,470-4, measured solids content 4.78 wt. %). The weight ratio of PEDT-S to Nafion® is in this solution 1:6.

example 2.2

[0113] 20 g of the PEDT-S solution prepared according to Example 1 with a solids content of 1.45 wt. % are mixed with 15.17 g of a 4.78 wt. % solution of Nafion® in a mixture of lower aliphatic alcohols and water (Nafion® perfluorinated ion-exchange resin, 5 wt % solution in lower aliphatic alcohols / H2O″, CAS-No. 66796-30-3, Aldrich Order No. 27,470-4, measured solids content 4.78 wt. %). The weight ratio of PEDT-S to Nafion® is in this solution 1:2.5.

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Abstract

The invention relates to compositions which include: (a) a polythiophene containing repeating units represented by the following general formula (I), wherein X represents, for example, —CH2—CH(CH2—O—(CH2)4SO3−H+)—; and (b) further polymers, that are different than polythiophene (a), and which contain SO3− M+ or COO−M+ groups. Also disclosed are electroluminescing (EL) arrangements that contain hole-injecting layers which include such compositions.

Description

CROSS REFERENCE TO RELATED PATENT APPLICATION [0001] The present patent application claims the right of priority under 35 U.S.C. §119 (a)-(d) of German Patent Application No. ______, filed Feb. 10, 2004. FIELD OF THE INVENTION [0002] The present invention relates to compositions / formulations containing polythiophenes and further polymers, their use, and electroluminescing arrangements containing hole-injecting layers containing these formulations. BACKGROUND OF THE INVENTION [0003] An electroluminescing arrangement (EL arrangement) is characterised in that when an electrical voltage is applied it emits light accompanied by a flow of current. Such arrangements have been known for a long time under the description “light-emitting diodes”) (LEDs). The emission of light is due to the fact that positive charges (“holes”) and negative charges (“electrons”) recombine with the emission of light. [0004] The LEDs conventionally used in technology all consist to a very large extent of inorgani...

Claims

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Application Information

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IPC IPC(8): C08L25/18C08L27/12H01L51/50C08L65/00C08L101/06H01L51/30
CPCC08L25/18C08L27/12C08L65/00H01L51/0037Y02E10/549C08L2666/06C08L2666/04H10K85/1135B05C13/02B62D25/12
InventorELSCHNER, ANDREASREUTER, KNUDLOVENICH, PETER WILFRIED
OwnerHERAEUS PRECIOUS METALS GMBH & CO KG