Two‐photon excitation and optical limiting in polyfluorene derivatives |
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Authors: | Daniel S. Correa Leonardo De Boni Bruno Nowacki Isabel Grova Bruno D. Fontes Paula C. Rodrigues José R. Tozoni Leni Akcelrud Cleber R. Mendonça |
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Affiliation: | 1. EMBRAPA Instrumenta??o, Rua XV de Novembro, 1452, S?o Carlos, S?o Paulo 13560‐970, Brazil;2. Departamento de Física e Ciência dos Materiais, Instituto de Física de S?o Carlos, Universidade de S?o Paulo, S?o Carlos, S?o Paulo 13560‐970, Brazil;3. Departamento de Química, Universidade Federal do Paraná, Curitiba, Paraná 81531‐990, Brazil;4. Instituto de Física, Universidade Federal de Uberlandia, Uberlandia, Minas Gerais 38400‐902, Brazil |
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Abstract: | Fluorene‐based polymers are widely known materials due to a combination of features such as photoluminescence and electroluminescence, oxidative stability, and film‐forming ability. However, studies reporting nonlinear optical properties in this class of conjugated polymer are scarce. Here, we report a new class of polyfluorene derivatives poly(9,9′‐n‐dihexyl‐2,7‐fluorenedilvinylene‐alt‐1,4‐phenylenevinylene), poly(9,9′‐n‐dihexyl‐2,7‐fluorenedilvinylene‐alt‐2,5‐thiophene), and poly[(9,9‐di‐hexylfluorenediylvinylene‐alt‐1,4‐phenylenevinylene)‐co‐((9,9′‐(3‐t‐butylpropanoate) fluorene‐1,4‐phenylene)] displaying high two‐photon absorption (2PA) in the spectral range from a 490 to 1100 nm. The 2PA cross‐section peak values for these materials are as high as 3000 Göppert Mayer (1 GM = 1 × 10?50 cm4 s/photon), which is related to the high degree of conjugation along the polymer backbone. The polymers that were used in this study presented a strong two‐photon luminescence and also displayed optical limiting behavior, which, in combination with their well‐established properties, make them highly suitable for nonlinear optical devices. © 2011 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 50: 148–153, 2012 |
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Keywords: | fluorescence laser‐induced polymers nonlinear polymers optics |
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