Partially polarized fluorescence emitted by MEHPPV in solution

Electrochemical Deposition of P3AT Films Used as a Probe of Optical Properties in Polymeric System

“…Thus, part of the absorbed light is transferred via Förster processes to another polymer with larger conjugation length, pristine and quinone structures, in a random direction, depolarized and decreasing the values of the S 1 /S 0 factor close to zero above 525 nm. However, some excited oligomers and low molecular weight chains may not energy transfer increasing the emission in the parallel direction of excitation polarized light [9,26]. It is observed in the S 1 /S 0 factor from 475 to 525 nm spectral range due to the efects of the substrate-polymer or polymer-polymer interface [14,22].…”

“…In addition, it is possible to correlate the energy transfer mechanisms [44,45] and polarization light states [22,[25][26][27]. Note that, in general, they are intrinsic characteristics semiconductor polymers.…”

“…Note that, in general, they are intrinsic characteristics semiconductor polymers. Stokes parameters are directly related to the light polarization states and, consequently, with factors related to orientation of the polymer chains in the ilms [25,26], in which it provides information about the samples molecular ordering along the polymer ilms.…”

“…Recently, we demonstrated the correlation between polarized emission light and P3DDT ilms grown using the electrochemical using emission ellipsometry technique [25,26,40]. Photoluminescence polarization reveal important properties of the material structure, e.g., anisotropy, which has immediate application in industry [41].…”

“…Interface efects cause signiicant quenching of excited carriers and it is commonly investigated by conventional spectroscopic techniques [15,19], such as ultraviolet-visible absorption (UV-Vis), photoluminescence (PL), photoluminescence excitation (PLE), vibrational spectroscopy (FT-IR and RAMAN) [8,12,20,21] and the morphological technique of atomic force microscopy (AFM) [22][23][24]. In the case of energy transfer processes of excited carriers, the analysis of polarization of emited light can be directly correlated with polymeric chain position parallel to the direction of the transition dipole moment [25][26][27]. Moreover, we need to consider the efects of the deposition method.…”