Energy transfer mechanism and optoelectronic properties of (PFO/TiO2)/Fluorol 7GA nanocomposite thin films

Energy transfer between poly (9,9'-di-n-octylfluoreny1-2,7-diy1) (PFO) as a donor in presence of TiO2 nanoparticles (NPs) and Fluorol 7GA as an acceptor with different weight ratios has been investigated by steady-state emission measurements. Based on the absorption and fluorescence measurements, the energy transfer properties, such as quenching rate constant (k(SV)), energy transfer rate constant (K-ET), quantum yield (phi(DA)), and lifetime (tau(DA)), of the donor in the presence of the acceptor, energy transfer probability (P-DA), energy transfer efficiency (eta), energy transfer time (tau(ET)), and critical distance of the energy transfer (R-0) were calculated. Forster-type energy transfer between the excited donor and ground-state acceptor molecules was the dominant mechanism responsible for the energy transfer as evidenced by large values of k(sv), k(ET), and R-o. Moreover, these composite materials were employed as an emissive layer in organic light-emitting diodes (OLED5). Additionally, the optoelectronic properties of OLEDs were investigated in terms of current density voltage characteristics and electroluminescence spectra. ()C) 2017 Elsevier B.V. All rights reserved.