Strong Electroluminescence in a Disubstituted Polyacetylene

A new disubstituted polyacetylene bearing naphthylethynylphenyl moiety (1) shows strong blue electroluminescence (λ_max = 492 nm) with a maximum intensity of 176 cd/m² at 23 V and a maximum efficiency of 0.12 lm/W at 18 V in a light-emitting diode with a device configuration of ITO/1/Bathcuproine/Alq₃/LiF/Al. By doping poly(N-vinylcarbazole) into 1, the maximum luminance and efficiency of the devices can be further improved to 411 cd/m² at 23.5 V and 0.59 lm/W at 15 V, respectively. These are the best results for disubstituted polyacetylenes attainable so far.