Pt(II) complex based phosphorescent organic light emitting diodes with external quantum efficiencies above 20%

Phosphorescent organic light emitting diodes with >20% external quantum efficiency have been demonstrated for the first time using a cyclometalated Pt (II) complex with a triarylboron group, i.e., acetylacetonato (5-dimesitylboryl-2-(phenyl)pyridyl)platinum(II), or Pt-BppyA. This unprecedented device performance is mainly attributed to the high quantum yield of the Pt (II) complex that is achieved by using a triarylboron moiety as well as to the highly optimized double emission zone device architecture. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3593495]