Two new compounds based on three carbazole units connected by triple bonds as p-spacers have been

developed as deep blue emitters for organic light-emitting diodes (OLEDs). Their optical and

electrochemical properties were examined and their charge carrier transport properties were

investigated by means of the xerographic time-of-flight (XTOF) technique. The prepared diodes

demonstrate the feasibility of the new molecules as effective emitters in the deep blue region yielding

devices with low turn-on voltages.