PHOTOLUMINESCENT OXYGEN SENSING ON A SPECIFIC SURFACE-AREA USING PHOSPHORESCENCE QUENCHING OF PT-PORPHYRIN

A highly reliable optical sensor for oxygen-pressure measurement was d eveloped. It was based on the phosphorescence quenching of platinum oc taethylporhyrin incorporated in polymer films by oxygen. In this work, in order to overcome the shortcomings when the traditional spectropho tometer is used for oxygen sensing, the sensor behaviors were studied using a CCD-camera scanning technique. The Stern-Volmer plots of oxyge n sensors showed improved linearity, compared with those of the tradit ional luminometer. The sensor was proved to have a good operational st ability and <10% of the photobleaching was observed after storage for more than 1 year in the absence of light at room temperature.