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, R1 to R4 each represent a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms.
本发明提供了一种具有新颖骨架的新型有机
金属配合物,其具有高发射效率,并通过减小发射光谱的半峰宽度来实现改善颜色纯度。本发明的一种实施例是一种有机
金属配合物,其中
β-二酮和包括两个或更多氮原子(包括一个配位原子)的六元杂环
芳烃环是
配体。在一般式(G1)中,X代表一个取代或未取代的六元杂环
芳烃环,包括两个或更多氮原子(包括一个配位原子)。此外,R1至R4分别表示具有1至6个碳原子的取代或未取代的烷基基团。