G. Nakhmanovich et al., Protonation-deprotonation effects on the electrooptics of bipyridine containing PPV derivatives, SYNTH METAL, 101(1-3), 1999, pp. 269-270
The electrooptic properties of novel bipyridine-containing PPV derivatives
were found to be sensitive to the presence of sub-ppm concentration of diff
erent acids and bases. Upon exposure to ammonia (or HCl) vapors, the polyme
r film turns yellow (orange) and the electro- and photoluminescence peak at
580 (640) nm. Using controlled exposure, stable yellow/orange luminescent
devices could be fabricated. In addition, reversible decrease (increase) of
the effect of aggregation is observed in the electro- and photoinduced abs
orption, upon the deprotonation (protonation) process.