The inventions describe disclosed and described herein relate to ambipolar small molecule host materials for guest phosphorescent metal complexes. Methods of making the ambipolar small molecules are also described. These ambipolar small molecules, which comprise both an oxadiazole and one or more carbazole groups, can be used to make the emission layers of unexpectedly efficient OLED devices containing the materials of the inventions, wherein (I) at least one of the R
1
, R
2
and R
3
groups is an optionally substituted carbazole group.
本发明涉及用于客体
磷光
金属配合物的双极小分子主体材料的发明和描述。还描述了制造双极小分子的方法。这些双极小分子包括
氧化二唑和一个或多个
咔唑基团,可用于制造意外高效的OLED器件的发射层,其中至少R1、R2和R3中的一个是可选取代的
咔唑基团。