Electroluminescence of polymer blend composed of conjugated and nonconjugated polymers. White-light-emitting Diode

Abstract

We report on the investigations of electroluminescence (EL) for the polymer blend composed of two organic soluble polymers. The blends consist of main chain conjugated poly[(2-methoxy-5-((2-ethylhexyl)oxy)-1,4-phenylene)vinylene] (MEH-PPV) and a side chain luminescent polymer, an alkoxy(trifluoromethyl)stilbene-substituted PMA derivative (CF3-PMA). Emitting colors of the polymer blends varied with the blending ratios of two polymers. The electroluminescent peak of the MEH-PPV-rich polymer blend ranged over 580-800 nm (orange-red light), and of the CF3-PMA-rich polymer blend ranged from 380 to 800 nm, resulting in a white-light emission. Additional new EL peaks of polymer blends at around 380 and 800 nm would originate from the CF3-PMA and the exciplex formed by photoinduced electron transfer between two polymers.