申请人:Kwansei Gakuin Educational Foundation
公开号:US11139438B2
公开(公告)日:2021-10-05
By manufacturing an organic EL element using a material for a light emitting layer including a pyrene-based compound represented by the following formula (2) as a host material and a polycyclic aromatic compound in which a plurality of aromatic rings is linked with a boron atom and a nitrogen atom or an oxygen atom as a dopant material, an organic EL element having, for example, excellent light emission efficiency is provided.
In the above formula (2), at least one hydrogen atom in a pyrene moiety may be substituted by an aryl having 6 to 10 carbon atoms or the like. Ar represents an aryl having 14 to 40 carbon atoms or a heteroaryl having 12 to 40 carbon atoms. These groups may be substituted by an aryl having 6 to 10 carbon atoms or the like. s and p each independently represent an integer of 1 or 2. s and p do not simultaneously represent 2. One or more hydrogen atoms in a compound represented by formula (2) may be each independently substituted by a halogen atom, cyano, or a deuterium atom.
通过使用以下公式(2)表示的基于吡啶的化合物作为主体材料,并且使用多个芳香环与硼原子和氮原子或氧原子连接的多环芳香化合物作为掺杂材料,制造有机EL元件,其中包括用于发光层的材料,提供了例如具有优异发光效率的有机EL元件。在上述公式(2)中,吡啶基中的至少一个氢原子可以被芳基取代,该芳基具有6到10个碳原子或类似物。Ar代表具有14到40个碳原子的芳基或具有12到40个碳原子的杂环芳基。这些基团可以被具有6到10个碳原子的芳基或类似物取代。s和p分别独立表示为1或2的整数。s和p不同时表示为2。由公式(2)表示的化合物中的一个或多个氢原子可以分别被卤素原子、氰基或氘原子取代。