Organic electroluminescence element

US8933622B2 · kind B2 · utility

Assignees

• Pioneer Corporation · JP
• MITSUBISHI CHEMICAL CORPORATION · JP

Inventors

• Shin Kawami · Tsurugashima, JP
• Taishi Tsuji · Tsurugashima, JP
• Hideki Sato · Osaka, JP
• Masayoshi Yabe · Yokohama, JP

Key dates

• Filing date: May 23, 2006
• Grant date: Jan 13, 2015
• Expiry date: Aug 1, 2027

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10K2102/351

Abstract

Disclosed is an organic electroluminescent device having a longer drive life. Specifically disclosed is an organic electroluminescent device (100) comprising an organic material layer (16), which is composed of a hole transporting layer (164), a light-emitting layer (166) and an electron transporting layer (167), between a pair of electrodes, namely a cathode (18) and an anode (12). The light-emitting layer (166) (having a film thickness (dM) of 5-3000 nm) contains a luminescent dye and a host material. The first oxidation potential (ED+) of the luminescent dye is lower than the first oxidation potential (EH+) of the host material, while the first reduction potential (ED−) of the luminescent dye is lower than the first reduction potential (EH−) of the host material. The film thickness (dE: 5-3000 nm) of the electron transporting layer (167) and the film thickness (dH: 5-3000 nm) of the hole transporting layer (164) satisfy the following relation: dH≦dE.