White organic EL element

US10790465B2 · kind B2 · utility

Assignee

• Canon Kabushiki Kaisha · JP

Inventors

• Tomokazu Kotake · Ebina, JP
• Hirokazu Miyashita · Tokyo, JP
• Itaru Takaya · Chiba, JP
• Takayuki Ito · Saitama, JP
• Koji Ishizuya · Fujisawa, JP
• Norifumi Kajimoto · Zama, JP

Key dates

• Filing date: Jul 26, 2019
• Grant date: Sep 29, 2020
• Expiry date: Jul 26, 2039

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02B20/00

Abstract

A white organic electroluminescent (EL) element includes, in sequence, an anode, a first light-emitting layer that is a blue-light-emitting layer, a hole-blocking layer, an electron transport layer, and a cathode. The hole-blocking layer is adjacent to the first light-emitting layer and the electron transport layer and formed of a hydrocarbon. The electron transport layer is formed of a nitrogen-containing heterocyclic compound. The first light-emitting layer contains a first host and a first dopant that emits blue fluorescent light. Relations (a), (b), and (c) are satisfied. LUMO(H1)>LUMO(D1)  (a)0.1<d(ETL)/d(HBL)<0.7  (b)90 nm≤d(E)=d(HBL)+d(ETL)<150 nm  (c)