Poly[3-(2-benzotriazoloethyl)thiophene] (PBET) containing an electron transporting moiety was blended with poly[2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylene vinylene] (MEH-PPV) by changing their composition ratio. The MEH-PPV was used as a hole transporting material. The blends were characterized by UV-vis, photoluminescence (PL), and electroluminescence (EL) studies. The external EL quantum efficiency was enhanced by blending; i.e. greater than in pure PBET by a factor of two in the blend film with weight ratio (PBET : MEH-PPV = 5 : 1).