News Column

Patent Issued for Process for Forming an Electroactive Layer

July 30, 2014

By a News Reporter-Staff News Editor at Journal of Engineering -- According to news reporting originating from Alexandria, Virginia, by VerticalNews journalists, a patent by the inventors Chesterfield, Reid John (Santa Barbara, CA); Butler, Justin (San Diego, CA); Sant, Paul Anthony (Santa Barbara, CA), filed on March 8, 2010, was published online on July 15, 2014.

The assignee for this patent, patent number 8778708, is E I du Pont de Nemours and Company (Wilmington, DE).

Reporters obtained the following quote from the background information supplied by the inventors: "This disclosure relates in general to a process for forming an electroactive layer. It further relates to electronic devices having at least one electroactive layer made by the process.

"An electronic device can include a liquid crystal display ('LCD'), an organic light-emitting diode (OLED) display, a thin film transistor (TFT) array, a solar cell, or the like. The manufacture of electronic devices may be performed using solution deposition techniques. One process of making electronic devices is to deposit organic layers over a substrate by printing (e.g., ink-jet printing, continuous printing, etc.). In a printing process, the liquid composition being printed includes an organic material in a solution, dispersion, emulsion, or suspension with an organic solvent, with an aqueous solvent, or with a combination of solvents. After printing, the solvent(s) is(are) evaporated and the organic material remains to form an organic layer for the electronic device.

"There is a continuing need for deposition processes that result in devices having improved performance."

In addition to obtaining background information on this patent, VerticalNews editors also obtained the inventors' summary information for this patent: "There is provided a process for forming a layer of electroactive material. The process comprises:

"providing a workpiece having at least one active area;

"depositing a liquid composition comprising the electroactive material onto the workpiece in the active area, to form a wet layer;

"treating the wet layer on the workpiece at a controlled temperature in the range of C. to C. and under a vacuum in the range of 10.sup.-6 Torr to 1,000 Torr, for a first period of 1-100 minutes, to form a partially dried layer;

"heating the partially dried layer to a temperature above C. for a second period of 1-50 minutes to form a dried layer,

"wherein the dried layer has a substantially flat profile in the active area.

"There is also provided an electronic device having at least one active area comprising an anode, a cathode, and at least one electroactive layer therebetween, wherein the electroactive layer is formed by liquid deposition and has a substantially flat profile in the active area.

"The foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as defined in the appended claims."

For more information, see this patent: Chesterfield, Reid John; Butler, Justin; Sant, Paul Anthony. Process for Forming an Electroactive Layer. U.S. Patent Number 8778708, filed March 8, 2010, and published online on July 15, 2014. Patent URL:

Keywords for this news article include: E I du Pont de Nemours and Company.

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Source: Journal of Engineering

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