Patent Number: 7,132,790

Title: Luminous device including conductive film

Abstract: Provided is a means for improving the capability of injecting electrons from a cathode in a luminous element and solving problems about the production process thereof. In the present invention, a material having a smaller work function than a cathode material is used to form an inorganic conductive layer between the cathode and an organic compound layer. In this way, the capability of injecting electrons from the cathode can be improved. Furthermore, the film thereof can be thicker than that of a conventional cathode buffer layer formed by using an insulating material. Therefore, the film thickness can easily be controlled, and a decrease in production costs and an improvement in yield can be achieved.

Inventors: Seo; Satoshi (Kawasaki, JP), Imai; Keitaro (Yokohama, JP)

Assignee: Semiconductor Energy Laboratory Co., Ltd.

International Classification: H05B 33/00 (20060101)

Expiration Date: 2019-11-07 0:00:00