ORGANIC EL ELEMENT, ORGANIC EL PANEL, AND ORGANIC EL ELEMENT MANUFACTURING METHOD

• Main Authors: SATO MUNEHARU, SEKIMOTO YASUHIRO, ISHINO SHINICHIRO, ODA TOMOHIKO, HASEGAWA MINEKI, AKIYAMA TOSHIYUKI, KAMIYA KEN, TAKADA MASAKAZU
• Format: Patent
• Language: English; Japanese
• Published: 30.05.2022
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; SEMICONDUCTOR DEVICES

To provide an organic EL element having lifespan which is increased by suppressing deterioration of a function layer caused by deactivation reaction between carriers and excitons.SOLUTION: An organic EL element is provided, comprising: an anode; a first functional layer disposed above the anode and including an organic material; a second functional layer disposed on and in contact with the first functional layer and including the organic material; a light emitting layer disposed on and in contact with the second functional layer; and a cathode disposed on the light emitting layer. A highest occupied molecular orbital (HOMO) level of the organic material included in the second functional layer has an energy level at least 0.2 eV lower than that of the HOMO level of the organic material included in the first functional layer, and a film thickness of the second functional layer is 15 nm or less.SELECTED DRAWING: Figure 2 【課題】励起子とキャリアとの失活反応による機能層の劣化を抑止して長寿命化した有機ＥＬ素子を提供する。【解決手段】陽極と、前記陽極の上方に配され、有機材料を含む第１機能層と、前記第１機能層の上に接して配され、有機材料を含む第２機能層と、前記第２機能層の上に接して配される発光層と、前記発光層の上方に配される陰極とを備える有機ＥＬ素子であって、前記第２機能層に含まれる有機材料の最高被占有軌道（ＨＯＭＯ）準位は、前記第１機能層に含まれる有機材料のＨＯＭＯ準位より０．２ｅＶ以上エネルギーレベルが低く、前記第２機能層の膜厚は、１５ｎｍ以下である。【選択図】図２