Patent ID: 8642350

Claim:
A method for the simultaneous quantitative sensing/determination of two analytes in a sample, in which a first analyte is oxygen and a second analyte is selected from pH (H + or OH − ) and acidic/basic gaseous ions, which method comprises the steps of: irradiating a sensor material with light of one or two wavelengths, determining photoluminescence lifetime and intensity signals originating from the sensor, and correlating the photoluminescence intensity signal with a concentration of the oxygen in the sample and the photoluminescence lifetime signal with the pH or the concentration of the acidic/basic gaseous ions, wherein the sensor comprises a long decay photoluminescent protonable dye embedded in a polymer, in which the dye in a phosphorent platinum (II) or palladium(II) porphyrin dye is substituted with a pH-responsive Schiff base.