Lifetime imaging of luminescent oxygen sensors based on all-solid-state technology

Conventional lifetime imaging requires rather complex and expensive instrumentation, like lasers and intensified CCD-cameras. We demonstrate that an array of light-emitting diodes and a directly gatable CCD-camera can be alternatively used for special applications as, for example, imaging of oxygen concentrations on a surface covered by an optical sensor. The suitability of low-cost devices is in this case favored by the microsecond decay times and the spectral properties of highly luminescent ruthenium(II) complexes, For an illuminated sensor area of 5 cm(2) and an aimed spatial resolution of 1 mm, oxygen resolution was better than Delta PO2 = 0.4 Torr in the absence of oxygen and Delta PO2 = 2.5 Torr at PO2 = 100 Torr.