Easy accessible blue luminescent carbazole-based materials for organic light-emitting diodes

A series of aryl substituted carbazoles with hole transport properties have been evaluated as blue emitters for organic light-emitting diodes (OLEDs). A simple structured blue OLED exhibits very low turn-on voltage of 4 V, high luminance up to 1.4 × 104 cd m−2 and maximum current efficiency of 3.3 cd A−1. A high efficiency of radiative exciton production (ϕ) of 45% has been calculated.207