Abstract
We report investigations into a poly(1,20-(10,13-didecyl)distyrylbenzene-co-l,2-(4-(p-ethylphenyl) )t riazole) (TRIDSB) electron transport material and its incorporation into single and multilayer LEDs. Multilayer devices were investigated with poly(p-phenylenevinylene) (PPV) and poly(2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene) as hole transport layers (HTLs). The incorporation of the polymer into an ITO/PPV/TRIDSB/Al LED facilitates electron injection into the hole transporting emissive layer and results in a tenfold increase in the external quantum efficiency for electroluminescence (EL) of the PPV layer from 0.008 to 0.08-0.1 percent. In an ITO/I-MEHPPV /TRIDSB/Al device, the corresponding increase in the quantum efficiency for EL from the I-MEHPPV is 50-fold, from 0.002 to between 0.06 and 0.11 percent. The polymer is shown to be thermally stable with no glass transition temperature or melting point detected within the range 25-250 C. (Author)