Organic light-emitting diodes using a novel family of amorphous molecular materials containing an oligothiophene moiety as colour-tunable emitting materials

A novel family of amorphous molecular materials containing an oligothiophen e moiety with varying conjugation length function as thermally and morpholo gically stable, colour-tunable emitting materials for organic light-emittin g diodes (LEDs). Tuning of the emission colour from light blue to orange is achieved by varying the conjugation length of the oligothiophene moiety. D ouble-layer organic LEDs that use this novel class of amorphous molecular m aterials as an emitting layer and tris(quinolin-8-olato)aluminium or 1,3,5- tris[5-(4-tert-butylphenyl)-1,3,4-oxadiazol-2-yl]benzene as an electron-tra nsport layer exhibit high performances.