Organic EL element

US10297776B2 · kind B2 · utility

Assignee

• JOLED INC. · JP

Inventors

• Kosuke Mishima · Tokyo, JP
• Yoshiyuki Ota · Tokyo, JP
• Junko TANAKA · Saitama, JP
• Takahiro Komatsu · Kasai, JP
• Hiroshi Katagiri · Nagoya, JP

Key dates

• Filing date: Jul 7, 2016
• Grant date: May 21, 2019
• Expiry date: Apr 28, 2037

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E10/549

Abstract

An organic electroluminescence (EL) element including an anode, a cathode opposing the anode, a light-emitting layer between the anode and the cathode, a hole transport layer in contact with the light-emitting layer, between the light-emitting layer and the anode, and an electron transport layer in contact with the light-emitting layer, between the light-emitting layer and the cathode. A difference between a lowest unoccupied molecular orbital (LUMO) level of an organic material included in the light-emitting layer and a LUMO level of an organic material included in the electron transport layer is greater than a difference between a highest occupied molecular orbital (HOMO) level of an organic material included in the hole transport layer and a HOMO level of the organic material included in the light-emitting layer.