ELECTROLUMINESCENCE OF POLYMER BLEND COMPOSED OF CONJUGATED AND NONCONJUGATED POLYMERS - WHITE-LIGHT-EMITTING DIODE

We report on the investigations of electroluminescence (EL) for the po lymer blend composed of two organic soluble polymers. The blends consi st of main chain conjugated hoxy-5-((2-ethylhexyl)oxy)-1,4-phenylene)v inylene] (MEH-PPV) and a side chain luminescent polymer, an alkoxy(tri fluoromethyl)stilbene-substituted PMA derivative (CF3-PMA). Emitting c olors of the polymer blends varied with the blending ratios of two pol ymers. The electroluminescent peak of the MEH-PPV-rich polymer blend r anged over 580-800 nm (orange-red light), and of the CF3-PMA-rich poly mer blend ranged from 380 to 800 nm, resulting in a white-light emissi on. Additional new EL peaks of polymer blends at around 380 and 800 nm would originate from the CF3-PMA and the exciplex formed by photoindu ced electron transfer between two polymers.