Light-emitting element, display device, method for manufacturing light-emitting element, and light emission method

US10658607B2 · kind B2 · utility

Assignee

• SHARP KABUSHIKI KAISHA · JP

Inventors

• Yuto Tsukamoto · Sakai, JP
• Katsuhiro Kikuchi · Kasai, JP
• Shinichi Kawato · Osaka, JP
• Manabu Niboshi · Osaka, JP
• Eiji Koike · Sakai, JP
• Asae Ito · Sakai, JP

Key dates

• Filing date: Jul 2, 2019
• Grant date: May 19, 2020
• Expiry date: Jul 2, 2039

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10K2102/351

Abstract

An organic EL element (10) includes a first light-emitting layer (33a) having the shortest emission peak wavelength of a light-emitting layer (33) and containing a host material and a TTF material or at least the TTF material, a second light-emitting layer (33b) containing at least a TADF material, a third light-emitting layer (33c) having the longest emission peak wavelength of the light-emitting layer (33) and containing at least fluorescent material. The excited triplet level of the TTF material is lower than the excited triplet level of the TADF material.