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.