As a novel substance having a novel skeleton, an organometallic complex with high emission efficiency which achieves improved color purity by a reduction of half width of an emission spectrum is provided. One embodiment of the present invention is an organometallic complex in which a β-diketone and a six-membered heteroaromatic ring including two or more nitrogen atoms inclusive of a nitrogen atom that is a coordinating atom are ligands. In General Formula (G1), X represents a substituted or unsubstituted six-membered heteroaromatic ring including two or more nitrogen atoms inclusive of a nitrogen atom that is a coordinating atom. Further, R
1
to R
4
each represent a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms.
作为一种具有新颖骨架的新型物质,提供了一种具有高发射效率的有机
金属配合物,通过减少发射光谱的半宽度实现了改善色彩纯度。本发明的一个实施例是一种有机
金属配合物,其中
β-二酮和包括两个或更多氮原子的六元杂芳环(其中包括一个氮原子作为配位原子)作为
配体。在通用式(G1)中,X代表一个取代或未取代的六元杂芳环,其中包括两个或更多氮原子,其中包括一个氮原子作为配位原子。此外,R1到R4分别代表具有1到6个碳原子的取代或未取代的烷基基团。