Organic light emitting element, comprising at least first and second light emitting layers with satisfying lowest unoccupied molecular orbital (LUMO) and highest occupied molecular orbital (HOMO) relations

US11411193B2 · kind B2 · utility

Assignee

• Canon Kabushiki Kaisha · JP

Inventors

• Hirokazu Miyashita · Tokyo, JP
• Itaru Takaya · Chiba, JP
• Naoki Yamada · Tokyo, JP
• Isao Kawata · Sayama, JP
• Yuto Ito · Utsunomiya, JP
• Jun Kamatani · Tokyo, JP

Key dates

• Filing date: Jun 12, 2020
• Grant date: Aug 9, 2022
• Expiry date: Oct 23, 2040

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10K2101/40

Abstract

An organic light emitting element includes, in sequence, an anode, a first light emitting layer, a second light emitting layer, and a cathode. The first light emitting layer includes a first compound and a first light emitting material. The second light emitting layer includes a second compound and a second light emitting material having an energy gap different from an energy gap of the first light emitting material. The organic light emitting element satisfies relations (a) to (c). LUMO(H1)>LUMO(D1)  (a)LUMO(H2)>LUMO(D2)  (b)LUMO(H2)−LUMO(D2)>LUMO(H1)−LUMO(D1)  (c) Where LUMO (H1), LUMO (D1), LUMO (H2), and LUMO (D2) represent a LUMO level of the first compound, a LUMO level of the first light emitting material, a LUMO level of the second compound, and a LUMO level of the second light emitting material, respectively.