申请人:Nippon Steel Chemical Co., Ltd.
公开号:EP2541635A1
公开(公告)日:2013-01-02
Disclosed is an organic electroluminescent device (organic EL device) that is improved in luminous efficiency, sufficiently secures driving stability, and has a simple configuration. This organic EL device comprises organic layers between an anode and a cathode piled one upon another on a substrate and at least one organic layer selected from a light-emitting layer, a hole-transporting layer, an electron-transporting layer, and a hole-blocking layer contains a carbazole compound represented by the following formula (1). In the case where the light-emitting layer of the organic electroluminescent device contains a phosphorescent dopant and a host material, it is the carbazole compound that is contained as the host material. In formula (1), X is C-Y or a nitrogen atom; Y is a hydrogen atom, an alkyl group, a cycloalkyl group, or an aromatic group; n is an integer of 2 to 4: A is an n-valent aromatic group; L is a direct bond or a divalent aromatic group; and R is a hydrogen atom, an alkyl group, or a cycloalkyl group.
本发明公开了一种有机电致发光器件(有机 EL 器件),它的发光效率更高,充分保证了驱动稳定性,而且结构简单。这种有机电致发光器件包括在基板上一个接一个堆叠的阳极和阴极之间的有机层,从发光层、空穴传输层、电子传输层和空穴阻挡层中选择的至少一个有机层含有由下式(1)表示的咔唑化合物。在有机电致发光器件的发光层包含磷光掺杂剂和宿主材料的情况下,咔唑化合物作为宿主材料被包含在内。在式 (1) 中,X 是 C-Y 或氮原子;Y 是氢原子、烷基、环烷基或芳香基;n 是 2 至 4 的整数:A 是 n 价芳香基;L 是直接键或二价芳香基;R 是氢原子、烷基或环烷基。