申请人:Yoshitake Osamu
公开号:US20070012935A1
公开(公告)日:2007-01-18
This invention provides an organic electroluminescent element (organic EL element) utilizing phosphorescence which emits light efficiently with high luminance at low current density, shows good driving stability and is applicable to display devices such as flat panel displays and illuminating devices. The element comprises an anode, organic layers and a cathode piled one upon another on a substrate, at least one of the organic layers is a light-emitting layer containing a host material and a dopant material and a pyrazole-derived compound having 2-4 pyrazole structures represented by the following formula I in the same molecule is used as said host material;
wherein, Ar
1
-Ar
3
are independently hydrogen or substituted or unsubstituted aromatic hydrocarbon groups and at least one of Ar
1
-Ar
3
is a group other than hydrogen.
这项发明提供了一种利用磷光的有机电致发光元件(有机EL元件),其在低电流密度下高效地发光,显示良好的驱动稳定性,并适用于如平板显示器和照明设备等显示设备。该元件包括在基板上堆叠的阳极、有机层和阴极,其中至少一个有机层是包含主体材料和掺杂剂材料以及具有以下式I所表示的2-4个吡唑结构的吡唑衍生物化合物作为所述主体材料的发光层;其中,Ar1-Ar3独立地为氢或取代或未取代的芳香烃基团,且Ar1-Ar3中至少有一个基团不为氢。