Organic electroluminescence element and method of manufacturing thereof

US9048448B2 · kind B2 · utility

Assignee

• JOLED INC. · JP

Inventors

• Kenji Harada · Kasai, JP
• Seiji Nishiyama · Hirakata, JP
• Takahiro Komatsu · Kasai, JP
• Takayuki Takeuchi · Kasai, JP
• Shinya Fujimura · Susono, JP
• Satoru Ohuchi · Osaka, JP
• Hirofumi Fujita · Osaka, JP
• Yoshiaki Tsukamoto · Osaka, JP

Key dates

• Filing date: Jan 16, 2013
• Grant date: Jun 2, 2015
• Expiry date: Jan 16, 2033

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10K59/8051

Abstract

An organic EL element comprises: an anode; a cathode; a functional layer including at least a light-emitting layer; a hole injection layer disposed between the anode and the functional layer; and a bank. The hole injection layer contains tungsten oxide. Tungsten atoms constituting the tungsten oxide include both tungsten atoms with a valence of six and tungsten atoms with a valence less than six. The hole injection layer includes a crystal of the tungsten oxide. A particle diameter of the crystal is on an order of nanometers. The hole injection layer has a recessed portion whose inner side surface has an upper edge that is one of (i) aligned with part of a lower edge of the bank, the part being in contact with the light-emitting layer, and (ii) in contact with a bottom surface of the bank.