申请人:Qiu Yong
公开号:US20050127826A1
公开(公告)日:2005-06-16
The present invention relates to a series of carbazole derivatives which are used in organic electroluminescent devices as the phosphorescent host materials of the emissive layers. The carbazole derivatives have glass transition temperature of between 70° C. and 220° C. and triplet energy of 2.62 eV or more. The carbazole derivatives comprise two carbazole groups and alkyl group and/or spiro group inserted between the carbazole group and aromatic group, which is represented by formula 1. The carbazole derivatives according to the present invention are used as host materials for the triplet emissive dyes and they have high energy and stability. They can also reduce the converse energy transfer from the dye molecules to the host molecules and improve the luminance and efficiency of the OLEDs, especially the efficiency and lifetime of the blue triplet OLEDs.
本发明涉及一系列咔唑衍生物,这些衍生物在有机电致发光器件中用作发光层的磷光主材料。这些咔唑衍生物的玻璃化温度在 70 摄氏度到 220 摄氏度之间,三重能在 2.62 eV 或更高。咔唑衍生物由两个咔唑基团和插入咔唑基团与芳香基团之间的烷基和/或螺基组成,由式 1 表示。根据本发明的咔唑衍生物可用作三重发射染料的宿主材料,它们具有高能量和稳定性。它们还能减少从染料分子到宿主分子的反向能量转移,提高有机发光二极管的亮度和效率,尤其是蓝色三重发光二极管的效率和寿命。