SYNTHESIS AND PHOTOPHYSICAL INVESTIGATION OF POSS-BASED FLUORESCENT MATERIALS FOR PHOTOCATALYTIC AND OLED APPLICATIONS

Diego Coelho Sanches Gloria; Raquel Aparecida Domingues; Maraisa Gonçalves; Participante 67809

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Trabalho

Título do Trabalho

SYNTHESIS AND PHOTOPHYSICAL INVESTIGATION OF POSS-BASED FLUORESCENT MATERIALS FOR PHOTOCATALYTIC AND OLED APPLICATIONS

Autores

Diego Coelho Sanches Gloria
Raquel Aparecida Domingues
Maraisa Gonçalves
Participante 67809

Modalidade

Pôster - resumo

Área temática

Materiais e biomateriais

Data de Publicação

27/05/2026

País da Publicação

Brasil

Idioma da Publicação

pt-BR

Página do Trabalho

https://www.even3.com.br/anais/workshop-do-ineo-2026/1459921-synthesis-and-photophysical-investigation-of-poss-based-fluorescent-materials-for-photocatalytic-and-oled-applic

ISBN

978-65-272-2467-9

Palavras-Chave

POSS, Silsesquioxanes, organic electronics, luminescence

Resumo

A class of materials that has gained increasing prominence in recent years is polyhedral oligomeric silsesquioxanes (POSS), cyclic polymers derived from siloxanes. These materials can present a variety of structures, such as a polygonal “cage-like” structure (POSS) and a ladder-type structure (LPSQ), and are of great interest due to the wide range of possible synthetic routes and the large number of compounds that can be coupled to these structures. This versatility provides the final products with significant flexibility and results in interesting thermal, electrical, and optical properties 1. In this work, four hybrid POSS materials synthesized from silsesquioxane were developed using emitting moieties derived from fluorene, thiophene, and tetrazine, identified as L1, L2, L3, and L4. Photophysical characterization of these samples showed broad absorption spectra for L1 and L2 within a similar range of approximately 310–330 nm, whereas L3 exhibited a more well-defined absorption spectrum, with two main bands at 286 and 331 nm and a smaller shoulder at 389 nm. The emission spectra of L1 and L2 displayed similar profiles. L1 presented two main bands at 370 and 391 nm and a red-shifted band at 574 nm. L2 exhibited a single main band at 338 nm and another band at 433 nm. The red-shifted bands observed at 574 and 433 nm for L1 and L2, respectively, are associated with aggregation effects, which are well known in fluorene and fluorene-based polymers. In contrast, the emission profile of L3 showed a single band at 501 nm, with no evidence of aggregation. Based on the photophysical characterization results, a photocatalytic assay was performed in an aqueous medium in the presence of Rhodamine B under UV irradiation to evaluate this potential application. The results indicated that the best-performing compound, L3 (derived from thiophene and tetrazine), exhibited catalytic activity, removing 19% of the initial dye concentration after 60 minutes and 58% after 240 minutes. These findings suggest the potential application of this material in photocatalysis, particularly for the degradation of organic compounds, due to its optical properties and its ability to form polymeric networks. Furthermore, this research provides a foundation for the future development of related materials, such as hybrid systems based on silsesquioxanes—specifically POSS (polyhedral oligomeric silsesquioxane) and LPSQ (ladder-type silsesquioxane)—and fluorene-derived semiconducting polymers synthesized via the Heck reaction. These materials are intended for use as efficient emissive components in the active layers of organic light-emitting diodes (OLEDs), aiming to produce devices that combine mechanical flexibility with electronic, thermal, and optical properties, extended operational lifetime, potential color tunability, ease of processing, and enhanced material durability. The authors acknowledge the financial support received from CAPES (process: 88887.208414 2025-00) and FAPESP (2019/06882-1 and 2016/18511-0 ) for the funding grants and student scholarship and INEO (FAPESP - processo nº 2025/27044-5 e CNPq - processo: 408449/2024-1). Referencias: 1. Hartmann-Thompson, C. Polyhedral Oligomeric Silsesquioxanes in Electronics and Energy Applications. in (2011). doi:10.1007/978-90-481-3787-9_7.

Título do Evento: Workshop do INEO 2026
Cidade do Evento: Nazaré Paulista
Título dos Anais do Evento: Anais do Workshop do INEO 2026
Nome da Editora: Even3
Meio de Divulgação: Meio Digital

Como citar

GLORIA, Diego Coelho Sanches et al.. SYNTHESIS AND PHOTOPHYSICAL INVESTIGATION OF POSS-BASED FLUORESCENT MATERIALS FOR PHOTOCATALYTIC AND OLED APPLICATIONS.. In: Anais do Workshop do INEO 2026. Anais...Nazaré Paulista(SP) Hotel Estância Atibainha, 2026. Disponível em: https//www.even3.com.br/anais/workshop-do-ineo-2026/1459921-SYNTHESIS-AND-PHOTOPHYSICAL-INVESTIGATION-OF-POSS-BASED-FLUORESCENT-MATERIALS-FOR-PHOTOCATALYTIC-AND-OLED-APPLIC. Acesso em: 10/08/2026