Development of novel optical oxygen sensing system based on stationary T–T absorption

A novel oxygen sensor based on stationary triplet–triplet (T–T) absorption was developed and the stationary absorption change of zinc 5,10,15,20-tetrakis-(pentafluorophenyl)-porphyrin (ZnTFPP) depending on oxygen concentration was investigated. In this technique, a photochemical equilibrium made by two continuous lights, which are S–S excitation and T–T excitation, and the change of equilibrium was monitored as the change of stationary T–T absorption. In this study, ZnTFPP in polystyrene and ZnTFPP immobilizing aluminium oxide were used as a sensor device and the difference between the two devices was clarified by the stationary quenching measurement.