Display element and method for producing the same

• US 20070048437A1
• Filed: 09/29/2006
• Published: 03/01/2007
• Est. Priority Date: 09/24/2002
• Status: Active Grant

• Current Assignee: Dai Nippon Printing Company Limited, Junji Kido
• Original Assignee: Dai Nippon Printing Company Limited, Junji Kido
• Inventors: Oyagi, Yasuyuki, Mori, Toshitaka, Kido, Junji
• Granted Patent: US 9,379,351 B2
• Time in Patent Office: Days
• US Class Current: 427/66
• CPC Class Codes: H10K 50/818 Reflective anodes, e.g. ITO combined with thick metallic layers
• CPC Class Codes: H10K 71/60 Forming conductive regions or layers, e.g. electrodes
• CPC Class Codes: H10K 85/10 Organic polymers or oligomers
• CPC Class Codes: H10K 85/111 comprising aromatic, heteroaromatic, or aryl chains, e.g. polyaniline, polyphenylene or polyphenylene vinylene
• CPC Class Codes: H10K 85/1135 Polyethylene dioxythiophene [PEDOT]; Derivatives thereof
• CPC Class Codes: H10K 85/151 Copolymers
• CPC Class Codes: H10K 85/324 comprising aluminium, e.g. Alq3
• CPC Class Codes: H10K 85/615 Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
• CPC Class Codes: H10K 85/631 Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine

Abstract

Disclosed are a production process of a display device, which can prevent the oxidation of a lower electrode and can maintain luminescence efficiency, high contract, and durability, and a display element. The display element comprises a first electrode, a luminescent layer, a second electrode, and a transparent substrate. The first electrode comprises a metal layer and a corrosion-resistant charge injection accelerating layer. The corrosion-resistant charge injection accelerating layer has been formed by subjecting a surface layer in the metal layer to plasma treatment using an oxygen atom-containing gas.

Claims

1. A process for producing a display element comprising the steps of:

forming a metal layer on a substrate;

performing patterning on the top of the metal layer;

subjecting the surface of the metal layer to plasma treatment using an oxygen atom-containing gas to convert the surface of the metal layer to a corrosion-resistant charge injection accelerating layer;

forming a luminescent layer on the corrosion-resistant charge injection accelerating layer; and

forming a second electrode on the luminescent layer.

2. The process according to claim 1, wherein, after the formation of the corrosion-resistant charge injection accelerating layer, the luminescent layer is formed on the corrosion-resistant charge injection accelerating layer without cleaning the substrate.

3. The process according to claim 1, wherein the formation of the luminescent layer on the corrosion-resistant charge injection accelerating layer is carried out under a degree of vacuum of not more than 1×

10<sup>−

2</sup> Pa.

4. The process according to claim 1, which further comprises the step of, after the formation of the corrosion-resistant charge injection accelerating layer, applying a liquid composition comprised of an electrically conductive polymer doped with an inorganic acid or an organic acid or a liquid composition comprising said electrically conductive polymer onto the corrosion-resistant charge injection accelerating layer.

5. The process according to claim 1, wherein, in forming the corrosion-resistant charge injection accelerating layer, the plasma treatment is controlled to regulate the thickness of the corrosion-resistant charge injection accelerating layer.