A material for a hole-transport layer includes a monoamine compound. The first aromatic group, the second aromatic group, and the third aromatic group are bonded to the nitrogen atom of the monoamine compound. The first and second aromatic groups each independently include 1 to 3 benzene rings. One or both of the first and second aromatic groups have one or more hydrocarbon groups each having 1 to 12 carbon atoms each forming a bond only by the sp
3
hybrid orbitals. The total number of the carbon atoms in the hydrocarbon group in the first or second aromatic group is 6 or more. The total number of the carbon atoms in all of the hydrocarbon groups in the first and second aromatic groups is 8 or more. The third aromatic group is a substituted or unsubstituted monocyclic condensed ring or a substituted or unsubstituted bicyclic or tricyclic condensed ring.
一种用于空穴传输层的材料包括单胺化合物。第一个芳基团、第二个芳基团和第三个芳基团均连接到单胺化合物的
氮原子上。第一个和第二个芳基团每个独立地包括1到3个
苯环。第一个和第二个芳基团中的一个或两个具有一个或多个各自具有1到12个
碳原子的烃基团,这些烃基团仅通过sp3杂化轨道形成键。第一或第二芳基团中的烃基团中的
碳原子总数为6个或更多。第一和第二芳基团中的所有烃基团中的
碳原子总数为8个或更多。第三个芳基团是取代的或未取代的单环稠环,或是取代的或未取代的双环或
三环稠环。