The synthesis of a new conjugated rigid-rod polyquinoline, ylene)-6,6'
-bis(4-(p-tert-butylphenyl)quinoline)), and its incorporation in light
-emitting diodes as the emissive layer are reported. These electrolumi
nescent devices, containing 1,1-bis(di-4-tolylaminophenyl)cyclohexan (
TAPC) dispersed in polystyrene as the hole-transport layer, emit brigh
t yellow light (lambda(max) = 554 nm) with a quantum efficiency of 0.2
6% photons/electron and a luminance of 280 cd/m(2) at a current densit
y of 100 mA/cm(2). These results also demonstrate that the new polyqui
noline is a good n-type (electron transport) electroluminescent materi
al.