Controlling the absorption and emission properties of polyparaphenylenevinylene films |
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| Authors: | Alexandre Marletta Raigna A Silva Paulo A Ribeiro Maria Raposo Débora Gonçalves |
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| Institution: | 1. Instituto de Física, Universidade Federal de Uberlândia, CP 593, 38400-902 Uberlândia, MG, Brazil;2. CEFITEC, Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Lisboa, Portugal;3. Instituto de Física de São Carlos, Universidade de São Paulo, CP 369, 13660-970 São Carlos, SP, Brazil;1. Departamento de Engenharia de Materiais, Vitreous Materials Laboratory, Universidade Federal de São Carlos, São Carlos, SP, Brazil;2. Departamento de Quimica, Instituto de Quimica de Araraquara, UNESP, Araraquara, SP, Brazil;3. Laboratório de Materiais Fotonicos, Instituto de Quimica de Araraquara, UNESP, Araraquara, SP, Brazil |
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| Abstract: | In this work we used the conversion process of a precursor polymer into polyparaphenylenevinylene (PPV) at low temperatures in order to control the effective conjugation degree of spin-casted PPV films. The absorption and emission spectra of the films were studied by following a partial substitution of chloride counterions from poly(xylylidene tetrahydrothiophenium chloride) (PTHT), used as a precursor, by sodium acid dodecylbenzenesulfonate (DBS), added as a surfactant salt. Upon controlling the DBS amount and conversion temperature (Tc) of PTHT/DBS to PPV films, the band gap of PPV changed from 409 to 506 nm, and 505 to 532 nm, values obtained from absorbance and emission measurements, respectively. Based on these experimental data, we proposed a physical model which represents the chemical structure of PPV as a distribution of conjugated chain segments (like oligomers) alternated by non-conjugated segments (structural defects and/or from the precursor polymer). |
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