Optimização de blendas de matrizes orgânicas condutoras inertes opticamente e moléculas de fenazina para fabricação de camada ativa em dispositivos eletro-ópticos fosforescentes

Abstract

In the present work, the optical properties of phenazine-based 1,2,3-triazole thin films dispersed in mCP (1,3-Bis (N-carbazolyl) benzene), an optically inert matrix and electric current conductor, were studied. The general goal of this work was the study of the optical properties in a regime of few interacting molecules in order to contribute to the knowledge of monomeric states, aggregate dimer states and triplet states of the material. In order to do so, the blends were fabricated from consecutive dilutions of the emitting molecule in relation to the matrix, and the films were produced through the dropcasting method. The optical characterization was performed through measurements of absorption, steady state photoluminescence, time resolved photoluminescence spectroscopy and microluminescence. The analysis of the experimental results showed that the fabrication method causes a high heterogeneity in the dispersion of the emitting molecules, revealing the existence of different molecular conformations in the film. It was also observed intense room temperature phosphorescence and the correlation of the triplet states with the aggregated states of dimers. The aggregate states were present even in the samples with the lowest concentrations and were not presented in a completely isolated way, always manifesting together with the monomeric states and/or triplet states, exhibiting complex molecular conformations. In conclusion, the analyzed materials have shown to be capable of being used as an active layer in phosphorescent electro-optical devices, being observed even the emission of white light.