A5023722615- Organic Electronics and Photovoltaics
- Photochemistry and Electron Transfer Studies
- Liquid Crystal Research Advancements
- Conducting polymers and applications
- Carbon and Quantum Dots Applications
- Graphene research and applications
- Organic Light-Emitting Diodes Research
- Graphene and Nanomaterials Applications
- Nonlinear Optical Materials Research
- Science and Education Research
- Polymer Nanocomposite Synthesis and Irradiation
- Molecular spectroscopy and chirality
- Luminescence and Fluorescent Materials
- Spectroscopy Techniques in Biomedical and Chemical Research
- Protein Interaction Studies and Fluorescence Analysis
- Photochromic and Fluorescence Chemistry
- Education and Digital Technologies
- Education and Public Policy
- Optical Polarization and Ellipsometry
- Carbon Nanotubes in Composites
- Surfactants and Colloidal Systems
- Spectroscopy and Quantum Chemical Studies
- Business and Management Studies
- Chemistry Education and Research
- Geography and Environmental Studies
Universidade Federal dos Vales do Jequitinhonha e Mucuri
2015-2024
Universidade Federal de Uberlândia
2006-2020
Universidade de São Paulo
2013-2014
Universidade Federal de São Carlos
2013
The control of emission properties in luminescent polymers such as poly(p-phenylene vinylene) (PPV) is important for various applications, and may be achieved with suitable molecular architectures nanostructured films. This paper reports on optical PPV films, using ellipsometry measurements emitted light the scope Stokes' theory. Organized films obtained Langmuir-Blodgett (LB) method exhibited high degree polarization light, while cast mainly non-polarized light. From data, a secondary...
This Letter reports about the molecular alignment effects on absorbance and emission properties of a new compound based 2,1,3-benzothiadiazole guested in liquid crystals. The ordering is available for different chromophore concentrations. Despite increasing disorder above concentration 0.20%, samples always present high degree linear polarization fluorescence. A considerable amount polarized observed during isotropic phase (T > 58 °C), which attributed to light by aligned molecules before...
The incorporation of dyes in liquid crystal matrices has been exploited to produce enhanced displays, but it can also be used probe ordering crystals and assess intermolecular interactions dye aggregation. In this study, we investigated polarized absorption emission the luminescent 4,7-bis(2-(4-(decyloxy)phenyl)ethynyl)-[2,1,3]-benzothiadiazole (1A) 4,7-bis{2-[4-(4-decylpiperazin-1-yl)phenyl]ethynyl}-[2,1,3]-benzothiadiazole (5A) E7® crystal. electronic structures both 1A 5A were affected by...
Abstract In this work we report the influence of molecular orientation on light emission polarization poly ( p ‐phenylene vinylene) (PPV) films. The oriented film was processed via Langmuir‐Blodgett (LB) technique while non‐ordered one by casting technique. By means an ellipsometry experiment, information about state emitted obtained Stokes parameters and dissymmetry factor (g). experiments were carried out at room low temperature (10 K) in phonon‐replicas range 543 633 nm. We have observed...
In this paper, we introduce simple procedures not only to enhance the polarized photoluminescence (PL) of poly(9,9-di-n-octylfluorenyl-2,7-diyl) (PFO) films but also vary relative concentrations PFO α- and β-phases. Enhanced molecular ordering was obtained by creating surface grooves on quartz substrates onto which were deposited treated at temperatures within nematic phase. More specifically, order parameter increased from ca. 0.10 for 0.57 when generated sliding a heated...
Em universidades multicampi, garantir a acessibilidade dos estudantes projetos em outros campi é um desafio. Neste trabalho relatada uma experiência interdisciplinar e multicampi projeto de extensão da UFVJM, durante os anos 2021 2022. No total, estiveram envolvidos 45 alunos, 3 10 cursos distintos, atividades conduzidas forma remota, tais como, criação conteúdo textual material audiovisual, culminando também na realização workshop online, trabalhos conclusão curso publicação artigos...