A series of 2,5-dialkoxy substituted poly(1,4-phenylenevinylene) derivatives containing a rigid and bulky
cyclohexyl group in the side chain, poly[2-(7-cyclohexylheptyloxy)-5-butoxy-1,4-phenylenevinylene]
(PBCyHpPV), Poly[2-(6-cyclohexylmethoxyhexyloxy)-5-butoxy-1,4-phenylenevinylene] (PBCyHxPV),
Poly[2,5-di-(6-cyclohexylmethoxy-hexyloxy)-1,4-phenylenevinylene] (PDCyHxPV) were synthesized via the
Gilch polymerization. The synthesized polymers were soluble in common organic solvents and showed good
thermal stability up to 370 oC. The maximum absorption of PBCyHpPV, PBCyHxPV and PDCyHxPV as thin
films was at 513 nm, 515 nm, 511 nm, respectively. Photoluminescence maximum emission of above polymers
appeared at 590 nm, 597 nm, 590 nm, respectively. The electroluminescence (EL) maxima of the polymers
appeared around 585-590 nm, and also showed another shoulder around 630 nm strongly. PDCyHxPV showed
the highest EL efficiency and EL power than those of other polymers due to the dilution effect of the two rigid
and bulky cyclohexyl groups.