SciELO - Scientific Electronic Library Online

vol.20 número1Photocatalytic degradation of the insecticide acetamiprid on TiO2 catalystStructural, morphological and vibrational properties of titanate nanotubes and nanoribbons índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados




Links relacionados


Journal of the Brazilian Chemical Society

versão impressa ISSN 0103-5053versão On-line ISSN 1678-4790


OLIVEIRA, Hueder P. M. et al. Photophysical properties and quantum chemical studies of poly(2,7-9,9'-dihexylfluorene-dyil). J. Braz. Chem. Soc. [online]. 2009, vol.20, n.1, pp.160-166. ISSN 1678-4790.

This work reports the photophysical properties (excitation and fluorescence spectra, fluorescence quantum yield, fluorescence lifetimes) of the poly(2,7-9,9'-dihexylfluorene-dyil) in dilute solutions of four solvents (toluene, tetrahydrofuran, chloroform and ethyl acetate) as well as the properties in solid state. Photoluminescence showed spectra characteristic of disordered α-backbone chain conformation. Simulation of the electronic absorption spectra of oligomers containing 1 to 11 mers showed that the critical conjugation length is between 6 and 7 mers. We also estimated the theoretical dipole moments which indicated that a coil conformation is formed with 8 repeating units per turn. We also showed that some energy transfer process appears in solid state which decreases the emission lifetime. Furthermore, based on luminescent response of the systems herein studied and electroluminescent behavior reported on literature, both photo and electroluminescence emissions arise from the same emissive units.

Palavras-chave : polyfluorene; photophysical properties; quantum mechanical calculation; photoluminescence.

        · resumo em Português     · texto em Inglês     · Inglês ( pdf )


Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons