Dichroism of photoluminescence PL of linear poly(2,3-di-p-tolylquinoxaline-5,8-diyl) indicates that the PL has a transition moment along the direction of the polymer main chain and an energy transfer takes place in the polymer. Poly(phenanthroline-3,8-diyl) and poly(pyridine-2,5-diyl) give analogous results and show a strong tendency to give excimer-type emission in both PL and electroluminescence.
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Yamamoto et al. (1996) studied this question.
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