SPECTRAL NARROWING OF PHOTOLUMINESCENCE IN CONDUCTING POLYMER AND FLUORESCENT DYES INFILTRATED IN PHOTONIC CRYSTAL, SYNTHETIC OPAL

Spectral narrowing of photoluminescence (PL) has been observed in cond ucting polymers such as poly(2,5-dialkoxy-p-phenylenevinylene) infiltr ated in photonic crystals, synthetic opals, upon light excitation. Suc h spectral narrowing has also been observed in synthetic opals infiltr ated with fluorescent dyes such as Rhodamine 6G and Coumarin. The thre shold of the spectral narrowing in conducting polymers and dyes infilt rated in opal is much lower than that in their solutions. Dependence o f spectral narrowing characteristics on the lattice periodicity of opa ls has also been studied. The results are discussed in terms of amplif ied spontaneous emission and lasing due to optical feedback in opal.