Organic luminescent device and manufacturing method thereof

US8461572B2 · kind B2 · utility

Assignees

• DENSO CORPORATION · JP
• KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO · JP

Inventors

• Masayuki Katayama · Miki, JP
• Kazushige Kojima · Nagoya, JP
• Tetsuya Katoh · Yokohama, JP
• Kunio Akedo · Nagoya, JP
• Toshikazu Satoh · Ebeye, US
• Koji Noda · Nasushiobara, JP
• Tomohiko Mori · Uji, JP
• Yoshihiro Kikuzawa · Nagakute, JP
• Koichi Sakaguchi · Toyokawa, JP

Key dates

• Filing date: May 14, 2009
• Grant date: Jun 11, 2013
• Expiry date: Jun 13, 2030

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10K85/6572

Abstract

There is provided a polymer or low-molecular-weight compound multilayer type organic EL device configured such that a light-emitting layer formed on a hole transport layer includes a mixture of a polymer material and a low-molecular weight material. With such a configuration, the low-molecular-weight material added to the polymer material serves as a binder filling the gap of the steric hindrance to form entanglement of the polymer material and the low-molecular-weight material. This results in that the interface between the hole transport layer and the light-emitting layer is an interface high in adhesion and also high in carrier injectability. Further, optimization of the formation conditions and materials can achieve still higher reliability and longer lifetime.