Patent Number: 6,806,640

Title: Organic electroluminescence device having current injection layer between light emitting layer and cathode

Abstract: Provided is an organic electroluminescence device which operates at a low voltage, has a uniform light emission surface, and can display high-quality images. In an organic electroluminescence device, an anode, a hole transport layer made of an organic compound, a light emitting layer made of an organic compound, and a cathode are stacked in the order named, and an electron injection layer containing a lanthanoid oxide is formed between the light emitting layer and cathode. The anode and/or cathode is made of a transparent conductive material. In another organic electroluminescence device, an anode, a hole transport layer made of an organic compound, a light emitting layer made of an organic compound, and a cathode are stacked in the order named, and an electron injection layer formed by mixing a lanthanoid metal oxide and organic compound is formed between the light emitting layer and cathode.

Inventors: Okada; Hiroyuki (Toyama, JP), Tabatake; Shigeru (Toyama, JP), Naka; Shigeki (Nei-gun, JP), Onnagawa; Hiroyoshi (Toyama, JP)

Assignee: President of Toyama University

International Classification: H01L 51/50 (20060101); H01L 51/05 (20060101); H01L 51/30 (20060101); H05B 033/00 ()

Expiration Date: 10/19/2021