Antonio Ribeiro's users group

Meeting 01 - Diéricon Souza - Fluorescence Lifetime Analysis with DecayFit

Diéricon ask me to teach him how to analyse his fluorescence lifetime data. In order to test the platform, i register him into my usergroup, using informations at: Helping on adding new mentee to your usergroup. the interaction by chat, video and áudio, also with control of other desktop (Skype functionality) permit me to be virtually present with him, directing the session to achieve our objectives.

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The influence of Diphenylalanine (PhePhe) self assembling into photophysics of PhePhe/Fluorophores systems: A theoretical pratical approach

Nanostructures of diphenylalanine (FF) have been extensively studied and are quite varied.This work aims to obtain self-assembled structures of diphenylalanine, containing electroluminescent compounds, with distinct morphological and photophysical characteristics from those of the starting materials. This work also intent to describe the photophysical properties of the structures obtained, integrating the experimental information to the theoretical predictions of computational simulations.

For this, FF were self-assembled having chromophores as additives and its photophysical properties determined by steady state fluorescence spectroscopy, time-resolved fluorescence spectroscopy and its morphology was studied by scanning electron microscopy. Experimental data were compared to the results of semi-empiric theoretical calculation performed by AM1 and ZINDO/S approaches. The resulting materials exhibit different time resolved and steady state fluorescence response from the starting materials and it is related to charge transfer complexes formation.

On theoretical approach, dimers and trimers can be part of the early stages of self-assembling. This find is important because this type of arrangement can lead to more conductive materials, of industrial interest, when combined with luminescent materials, especially if considered for energy conversion devices.