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

• Main Authors: SATO MUNEHARU, SEKIMOTO YASUHIRO, ISHINO SHINICHIRO, ODA TOMOHIKO, HASEGAWA MINEKI, KAMIYA KEN, AKIYAMA TOSHIYUKI, TAKADA MASAKAZU
• Format: Patent
• Language: English; Japanese
• Published: 18.02.2022
• Subjects: ADVERTISING; BASIC ELECTRIC ELEMENTS; CRYPTOGRAPHY; DISPLAY; DISPLAYING; EDUCATION; ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; LABELS OR NAME-PLATES; PHYSICS; SEALS; SEMICONDUCTOR DEVICES; SIGNS

To prolong a lifetime by improving light emission efficiency at a high temperature and maintaining high light emission efficiency over an operation temperature range in an organic EL element.SOLUTION: The present invention relates to an organic EL element configured by successively laminating a positive electrode, a light-emitting layer, an intermediate layer and a negative electrode. In the organic EL element, an electron implantation control layer which is disposed in the intermediate layer at a side of the light-emitting layer is further included, and a trap site is formed on an interface between the intermediate layer and the electron implantation control layer. A trap level of the trap site is lower than a lowest unoccupied molecular orbital (LUMO) of a functional material contained in the intermediate later by 35 meV or more, and density of the trap site is equal to or greater than 0.1% of electron density in the intermediate layer.SELECTED DRAWING: Figure 2 【課題】有機ＥＬ素子において、高温における発光効率を向上させ、動作温度全域で高い発光効率を維持し、長寿命化を図ることを目的とする。【解決手段】陽極と、発光層と、中間層と、陰極とがこの順に積層されてなる有機ＥＬ素子であって、前記中間層の前記発光層側に接して配される電子注入制御層をさらに備え、前記中間層と前記電子注入制御層との界面にトラップサイトが形成され、前記トラップサイトのトラップ準位は前記中間層に含まれる機能性材料の最低空軌道（ＬＵＭＯ）準位より３５ｍｅＶ以上低く、前記トラップサイトの密度は、前記中間層における電子密度の０．１％以上であることを特徴とする有機ＥＬ素子。【選択図】図２