Comparison between stationary intensity and lifetime luminescence measurements with fiber optic oxygen sensors containing Ru(4.7Ph2phen)32+ in silicone polymer

摘要

A behavior often registered in intensity based measurements of such sensors are the downcurved STERN-VOLMER-plots, which result in problems of reproducibility and calibration, especially between different sensors of the same type. Another effect is the disagreement between lifetime- and intensity-based STERN-VOLMER-plots, which should be the same in case of dynamic quenching. For a fiber optic system with the $LB@Ru(4.7Ph$- 2$/phen)$-3$/$RB$+2$PLU$/-complex in polydimethylsiloxan on the fiber tip mono- and multi-exponential decay models have been examined. There are no significant differences between monoexponential fitted lifetimes and weighted mean lifetimes from multi-exponential models. STERN-VOLMER-plots from lifetime measurements are in good agreement with intensity based measurements on fresh prepared samples.