The effect of bipolar charge transport of derivatives of 1-phenyl-1H-benzo[d]imidazole with horizontal molecular orientation on the performance of OLEDs based on thermally activated delayed fluorescence or phosphorescence

The synthesis and properties of two derivatives of 1-phenyl-1 H -benzo[ d ]imidazole with differing numbers of tert -butylcarbazole electron-donating moieties are reported.