申请人:Nippon Steel Chemical Co., Ltd.
公开号:EP2521197A1
公开(公告)日:2012-11-07
Disclosed is an organic electroluminescent device (organic EL device) which is improved in luminous efficiency, sufficiently secures driving stability, and has a simple configuration. The organic EL device of this invention comprises a light-emitting layer between an anode and a cathode piled one upon another on a substrate wherein the light-emitting layer contains a phosphorescent dopant and a 1,9-substituted carbazole compound as a host material. An example of the 1,9-substituted carbazole compound is represented by the following general formula (1). In formula (1), Ar is an aromatic hydrocarbon group or aromatic heterocyclic group; L is an aromatic hydrocarbon group or aromatic heterocyclic group; each of R1 to R3 is a hydrogen atom, an alkyl group, a cycloalkyl group, an aromatic hydrocarbon group, or an aromatic heterocyclic group; n is an integer of 1 to 3.
本发明公开了一种有机电致发光器件(organic EL device),它的发光效率更高,充分保证了驱动稳定性,而且结构简单。本发明的有机电致发光器件包括一个发光层,该发光层位于基底上一个叠着一个的阳极和阴极之间,其中发光层含有磷光掺杂剂和作为主材料的 1,9-取代咔唑化合物。1,9-取代咔唑化合物的一个例子由以下通式(1)表示。式(1)中,Ar 是芳香烃基团或芳香杂环基团;L 是芳香烃基团或芳香杂环基团;R1 至 R3 各为氢原子、烷基、环烷基、芳香烃基团或芳香杂环基团;n 是 1 至 3 的整数。