POLYMER LIGHT-EMITTING-DIODES

Polyphenylene vinylene-based conjugated-nonconjugated alternating bloc k copolymers form the active chromophores in a series of light emittin g diodes (LEDs). The quantum efficiency and brightness of these device s can be improved by several orders of magnitude by incorporation of a ppropriate carrier transport layers and by rational choice of electrod es. Further improvements can be gained by blending of the active chrom ophores with high or low molecular weight species.