Bipolar phenanthroimidazole–diazacarbazole hybrids with appropriate bandgaps for highly efficient and low roll-off red, green and blue electroluminescent devices

Abstract

Highly efficient three-primary color (R, G and B) OLEDs with low efficiency roll-off were realized by two structurally simple phenanthroimidazole–diazacarbazole hybrids with appropriate bandgap and bipolar charge-transporting properties.