New electroluminescent polymers: poly phenylene vinylene, derivatives and blends

Summary form only given. Multi-block alternating copolymers of rigid phenylene vinylene units of specified length interspersed with flexible spacer groups of methylene or of ethylene oxide oligomers have been synthesized. These materials are soluble and film forming and by varying the chromophore length and/or derivatization can be tuned to provide strong electro-luminescence at specified wavelengths to essentially cover the entire visible spectrum. The electrodes in a typical arrangement are indium-tin oxide and Al, Ca, Mg or Ag; the active polymer matrix is of the order of 100nM thick and the driving voltages are of the order of 10-30v. We have investigated electroluminescence in blends of these block copolymers with each other and with other chromophorically active macromolecules. Improved device efficiency with different configurations and electron/hole transport layers will be discussed.