Dependence of the Properties of Dihydroindenofluorene Derivatives on Positional Isomerism: Influence of the Ring Bridging

Abstract

Taking pole position: The relative position of the ring bridging has a unique and remarkable effect on the spectroscopic properties of dihydroindeno[1,2-a]/ [2,1-b]fluorenes (see picture). These blue-emitting positional isomers have been successfully used as the emitting layer in organic light-emitting diodes (OLEDs), with performance among the highest reported for dihydroindenofluorene-based OLEDs.