Studies on polythiophenes containing fused polyaromatic rings as side chains

• Molecular overcrowding effect produced significant enhancement in electronic properties.
• Band narrowing in electroluminescence of poly3-[4-(10-Phenyl-anthracen-9-yl)-phenyl]-thiophene (poly DPAT).
• All base color emission was realized in Light Emitting Diodes with polyDPAT.

The influence of fused polyaromatic and polyphenylene side chains on polythiophene absorption and photoluminescence was studied in detail. The above polymers were used as emissive layer in Light emitting diodes (LEDs) and the influence of structure and packing on current density, color and intensity of emission was studied in detail. The current density of the LEDs with poly 3-[4-(10-Phenyl-anthracen-9-yl)-phenyl]-thiophene (poly DPAT) and light emission intensity are high and there is a band narrowing of peaks at high voltages along with very high intensity of electroluminescence. The above properties are due to the presence of diphenyl anthracenyl group which produces molecular overcrowding and high spatial distribution off the π-Conjugated backbone.

Due to molecular overcrowding diphenylanthracenyl substituted thiophene polymers showed band narrowing in electroluminescenceFigure optionsDownload as PowerPoint slide