The characteristic Stern–Volmer-plots of sensors based on acompact polymer film (thickness 30 m) as well as on electro-spun nanofibers are plotted in Fig. 4. The investigated electrospunsensors show a slightly increased sensitivity at low and high oxy-gen concentrations (expressed by a slightly higher slope of theStern–Volmer plot in these concentration ranges) when comparedto a polymer film sensor, but the overall sensitivity is comparablefor both sensors. The Stern–Volmer plots could be fitted very wellwith the 2-component Stern–Volmer-“false light” model, whichis typical for the imperfect quenching behavior of luminescentdyes in polymer matrices compared to infinitely diluted solutions.The model is described in detail in [24]. The comparable oxygenquenching behavior (Stern–Volmer plots) of both sensor types fur-ther demonstrate that in both types of matrices, polymer filmsas well as nanofibers, the dyes experience very similar micro-environments (macromolecular short and long range order, freevolume, glass transition temperature, etc.).