| abstract |
The present invention provides an OLED, wherein an organic thin film layer comprising a single layer or multiple layers is provided between the cathode and the anode, wherein the organic thin film layer comprises at least one light-emitting layer, and the at least one light-emitting layer comprises (a) the following formula (1 ), wherein Ar 1 , Ar 2 , Ra and Rb represent substituted or unsubstituted benzene rings or fused aromatic hydrocarbon groups, the fused aromatic hydrocarbon groups are selected from substituted or unsubstituted naphthalene rings, ring, substituted or unsubstituted fluoranthene ring, triphenylene ring, substituted or unsubstituted phenanthrene ring, substituted or unsubstituted triphenylene ring, substituted or unsubstituted ditriphenylene ring, substituted or unsubstituted benzotriphenylene ring, Substituted or Unsubstituted Benzo ring, a substituted or unsubstituted perylene ring, and a substituted or unsubstituted benzofluoranthene ring; and (b) at least one phosphorescent material comprising a phosphorescent organometallic complex having one of the following partial chemical structures represented by the formula The substituted chemical structure represented: wherein each R is independently hydrogen or an alkyl substituent having 1-3 carbon atoms, and wherein at least one ring of the formula has one or more of said alkyl substituents. |