Blue electroluminescent copolymers by parylene-based chemical vapor deposition

Copolymerization of chemically vapor deposited poly(p-phenylenevinylene) an d parylene-N is explored as a method for color-tuning the polymer photolumi nescence. A significant blue shift in peak photoluminescence from that of p ristine poly(p-phenylenevinylene) is observed in the vapor-deposited copoly mer, the magnitude of which is controlled by the delivery rates of each of the monomers, with peak photoluminescence wavelengths ranging from 525 nm f or low parylene-N incorporation to 470 nm for high parylene-N incorporation . These copolymers are successfully integrated into single-layered light-em itting diodes exhibiting blue light output, which is the first demonstratio n of color-tuning poly(p-phenylenevinylene) prepared by parylene-based chem ical vapor deposition.