PHOTOPHYSICAL PROPERTIES OF NEW ORGANIC FLUOROPHORES DERIVED FROM BENZAZOL

Dione da Costa Oliveira; Thiago Cazati; Bruna B Postacchini

Todos os Trabalhos

Trabalho

Título do Trabalho

PHOTOPHYSICAL PROPERTIES OF NEW ORGANIC FLUOROPHORES DERIVED FROM BENZAZOL

Autores

Dione da Costa Oliveira
Thiago Cazati
Bruna B Postacchini

Modalidade

Pôster

Área temática

3) Design, Synthesis, and Characterization of Electronic/Optoelectronic Materials and Devices

Data de Publicação

17/05/2024

País da Publicação

Brasil

Idioma da Publicação

Inglês

Página do Trabalho

https://www.even3.com.br/anais/workshop-do-ineo-2024/795028-photophysical-properties-of-new-organic-fluorophores-derived-from-benzazol

ISBN

978-65-272-0462-6

Palavras-Chave

Benzazoles, molecular photophysics, photophysical properties, electrochemical properties.

Resumo

The benzoselenodiazole (BDS) unit, incorporating p-conjugated donor–acceptor–donor (D-A-D) and D-p-A type small molecules, has demonstrated widespread utility in electronic devices, including OLEDs, solar cells (both dye-sensitized solar cells (DSSC) and bulk heterojunction (BHJ) organic cells), and fluorescent sensors, attributed to the phenomenon of intramolecular charge-transfer (ICT). This intramolecular charge-transfer involves the migration of electrons from the electron-rich core of the donor to the electron-poor acceptor core. Minor adjustments in molecular architectures yield diverse optical and electronic properties. Notably, benzoselenadiazole (BDS), benzothiadiazole (BDT), and benzooxadiazole (BDO) have served as acceptor units in D-A-D type small molecules within various organic electronic devices. Among these, BDS holds particular promise due to its lower electronegativity and heightened polarizibility stemming from selenium. This work presents a comprehensive study of novel molecules derived from benzazoles, specifically 4,7-bis(phenylethynyl)[2,1,3]benzothiadiazole (BST) and 4,7-bis(phenylethynyl)[2,1,3]benzoselenodiazole (BSe), exploring their photophysical properties under different experimental and electrochemical conditions. The research included analysis in solvents of various polarities, varied concentrations, and the study of properties in the solid state. In solvents of different polarities, a linear increase in Stokes shift was observed for most aprotic solvents employed, covering both polar and nonpolar solvents. However, distinct behavior was identified for protic solvents and oxalane, suggesting the existence of specific molecular interactions between these molecules and these particular solvents. Concentration analysis in acetonitrile revealed fluorescence with linear behavior at low concentrations, followed by fluorescence quenching at higher concentrations, indicating the influence of intermolecular interactions on photophysical properties. The occurrence of longer lifetimes and lower fluorescence quantum efficiencies with increasing concentration concurrently indicates radiative and non-radiative energy transfer. Stern-Volmer plot construction identified static quenching by effective sphere as the predominant non-radiative quenching mechanism. In the solid state, the band gaps (EGAP) of BST and BSe, 2.76 eV and 2.31 eV, respectively, suggest applications in organic electronics as these values fall within the visible region of the electromagnetic spectrum. This study aimed to explore the photophysical properties of the novel molecules BST and BSe, enabling future studies for practical applications in optoelectronic devices. Acknowledgments: CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior)

Título do Evento: Workshop do INEO 2024
Cidade do Evento: Nazaré Paulista
Título dos Anais do Evento: Anais do Workshop INEO 2024
Nome da Editora: Even3
Meio de Divulgação: Meio Digital

Como citar

OLIVEIRA, Dione da Costa; CAZATI, Thiago; POSTACCHINI, Bruna B. PHOTOPHYSICAL PROPERTIES OF NEW ORGANIC FLUOROPHORES DERIVED FROM BENZAZOL.. In: Anais do Workshop INEO 2024. Anais...Nazaré Paulista(SP) Hotel Estância Atibainha, 2024. Disponível em: https//www.even3.com.br/anais/workshop-do-ineo-2024/795028-PHOTOPHYSICAL-PROPERTIES-OF-NEW-ORGANIC-FLUOROPHORES-DERIVED-FROM-BENZAZOL. Acesso em: 29/08/2025