OPTICAL-PROPERTIES AND BLUE AND GREEN ELECTROLUMINESCENCE IN SOLUBLE DISUBSTITUTED ACETYLENE POLYMERS

Intense photoluminescence (PL) was observed in soluble disubstituted p olyacetylenes such as poly(1-phenyl-2-p-adamantylphenyl acetylene (PDP A-Ad) at 530 nm, poly(1-phenyl-2-p-triphenylsilylphenyl acetylene) (PD PA-TPSi) at 530 nm and poly(1-hexyl-2-phenyl acetylene) (PHxPA) at 455 nm, although they are considered to be derivatives of trans-polyacety lene. In monosubstituted acetylene polymers such as poly(o-trimethylsi lylphenyl acetylene) (PTMSiPA), PL was negligible. Green and blue ligh t emissions were observed from an electroluminescent (EL) device havin g soluble poly(diphenyl acetylene) (PDPA) derivatives (PDPA-Ad and PDP A-TPSi) and PHxPA as emission layers, respectively. EL emission is cle arly observable under normal room illumination conditions. The electro nic energy structures of the disubstituted PA derivatives are also dis cussed to interpret PL and EL characteristics.