New solid-state phosphorescent oxygen sensors produced by solvent spotting on hydrophilic polyolefinfabrics are described. The method comprises of a simple spotting of dye solution, followed by a shortposttreatment of water washing and baking (<4 h), resulting in sensors with uniform distribution ofdye molecules in a discrete spot. The resulting sensors exhibited high brightness, optimal lifetime signals (27-31 mu s at 21 kPa and 49-53 mu s at 0 kPa O-2), quasi-linear Stern-Volmer plots and temperaturedependence. Compared to the commercial O-2 sensors (PS coating on the micro porous support), thenew polyolefin-based sensors performed well, showing good wettability and fast response time in liquid (3 min for wetlaid and 7 min for spunbond PP vs. 32 min for the reference). The homogeneity of thesensors was confirmed by microscopic analysis using PLIM (phosphorescence lifetime imaging). Both sensors exhibit cross-sensitivity to humidity which is investigated in this paper through the use of confocalmicroscopy. (C) 2014 Elsevier B. V. All rights reserved.