Analysis of the absorption and emission spectra of poly(p-phenylene vinylene) films thermally converted at a relatively low temperature |
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| Institution: | 1. Instituto de Física, Universidade Federal de Uberlândia, CP 593, 38400-902, Uberlândia – MG, Brazil;2. Instituto de Física de São Carlos, Universidade de São Paulo, CP 369, 13660-970, São Carlos – SP, Brazil;1. Departamento de Fisicá, Universidade Estadual de Maringá, Maringá, PR, Brazil;2. Departamento de Fisicá, Universidade Estadual de Maringá, Maringá, PR, Brazil;3. Departamento de Engenharia de Materiais, Vitreous Materials Laboratory, Universidade Federal de São Carlos, São Carlos, SP, Brazil |
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| Abstract: | In this work, we studied the absorption and emission spectra of spin-coated poly(p-phenylene vinylene) (PPV)–dodecylbenzenesulfonic counter-ion (DBS) films. The PPV–DBS films were obtained from a soluble precursor polymer thermally converted to PPV over a comparatively short time interval (30 min), and at low temperature (110 °C), conditions that yielded films with few structural defects. The line shape of the absorption spectra of the films deposited on glass substrates was analyzed by assuming a Gaussian distribution of segments along the main chain of PPV, and a conjugation degree between 3 and 15 units. For emission studies, only PPV segments with a high conjugation degree or a lower energy gap (HOMO–LUMO transition) contributed to the feature of the spectra. |
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