Photoluminescent properties in perylene PVD films: Influence of molecular aggregates and supramolecular arrangement

Autor(es)

Fernandes, Jose Diego ^[1] ; Pazin, Wallance Moreira ^[1] ; Aroca, Ricardo Flavio ^[2] ; Macedo Junior, Wagner Dias ^[1] ; Teixeira, Silvio Rainho ^[1] ; Leopoldo Constantino, Carlos Jose ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ UNESP, Sch Technol & Appl Sci, Dept Phys, Presidente Prudente, SP - Brazil

^[2] Univ Windsor, Windsor, ON N9B 3P4 - Canada

• Tipo de documento: Artigo Científico
• Fonte: SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY; v. 211, p. 221-226, MAR 15 2019.
• Citações Web of Science: 1

Resumo

Organic thin films are at the forefront of basic studies and applications in the field of physics, chemistry, biochemistry and materials science. For example, the intrinsic supramolecular arrangement, or simply the formation of aggregates may alter the optical and electrical properties, which would impact the potential applications of the material. Here, art attempt is made to correlate the molecular structures of two perylene derivatives, bis butylimido perylene (BuPTCD) and bis phenethylimido perylene (PhPTCD), with their film formation, in particular, the supramolecular arrangement and the photoluminescent properties. Emission spectra show that the PhPTCD has a radiative efficiency (RE) higher than that for BuPTCD when both are in solutions (monomers). Complementary, regarding PVD films, UV-Vis absorption measurements reveal that PhPTCD forms, predominantly, J aggregates, which are responsible for perylene derivative emission. However, BuPTCD PVD films are found to provide higher RE than PhPTCD PVD film. This apparent controversy could be explained considering other features such as crystallinity and molecular organization. The PVD film of BuPTCD is crystalline while PhPTCD PVD film is amorphous; BuPTCD has an edge-on while PhPTCD has a face-on molecular organization in PVD films. (C) 2018 Elsevier By. All rights reserved. (AU)

• Processo FAPESP: 13/14262-7 - Filmes nanoestruturados de materiais de interesse biológico
• Beneficiário: Osvaldo Novais de Oliveira Junior
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 16/09633-4 - Mecanismo de ação do composto bioativo Artepillin C em sistemas miméticos de membranas e membranas citoplasmáticas de células tumorais
• Beneficiário: Wallance Moreira Pazin
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado