Nonlinear Investigation of Fluorene-Benzothiadiazole Copolymers with Multiphoton Absorption and Highlights as Optical Limiters

Autor(es)

Cocca, Leandro H. Zucolotto ; Valverde, Joao V. P. ; de Brito, Elisa B. ; de Freitas, Jilian Nei ; Vmarques, Maria de F. ; Mendonca, Cleber R. ; De Boni, Leonardo

• Tipo de documento: Artigo Científico
• Fonte: ACS OMEGA; v. N/A, p. 9-pg., 2025-04-16.

Resumo

In recent years, conjugated polymers have garnered significant interest due to their versatile optical and electronic properties, including low band gaps and strong absorption in the visible and near-infrared regions. These features, combined with high molar absorptivity and notable photoluminescence and electroluminescence quantum yields, make these materials highly suitable for applications in optoelectronics, nonlinear optics, and other advanced photonic technologies. This study investigates the linear and nonlinear optical properties of three fluorene-benzothiadiazole-based copolymers-PFDTBT, PFDTBT-M24, and F8BT-differentiated by their electron-accepting units and polymer chain lengths. Through comprehensive spectroscopic analysis, including one-photon absorption, fluorescence emission, and multiphoton absorption studies, as well as quantum chemical calculations, the research provides insights into how molecular design can be optimized for nonlinear optical performance. The results reveal significant two-photon absorption cross sections and demonstrate the potential of these materials for multiphoton-excited fluorescence and optical limiting applications. (AU)

• Processo FAPESP: 18/11283-7 - Fotônica não linear: espectroscopia e processamento avançado de materiais
• Beneficiário: Cleber Renato Mendonça
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 16/20886-1 - Modernização da linha de Espectroscopia Óptica Não Linear ultrarrápida: Absorção transiente e chave kerr óptica com controle da polarização.
• Beneficiário: Leonardo de Boni
• Modalidade de apoio: Auxílio à Pesquisa - Regular