Efficient electroluminescence from a newn-type conjugated polyquinoline

Abstract

The synthesis of a new conjugated rigid-rod polyquinoline, poly(2,2′-(p-phenylene)-6,6′-bis(4-(p-tert-butylphenyl)quinoline)), and its incorporation in light-emitting diodes as the emissive layer are reported. These electroluminescent devices, containing 1,1-bis(di-4-tolylaminophenyl)cyclohexane (TAPC) dispersed in polystyrene as the hole-transport layer, emit bright yellow light (λmax = 554 nm) with a quantum efficiency of 0.26% photons/electron and a luminance of 280 cd/m2 at a current density of 100 mA/cm2. These results also demonstrate that the new polyquinoline is a good n-type (electron transport) electroluminescent material.