Photoinduced electron transfer as a design concept for luminescent redox indicators.

The general design principle for developing luminescent redox indicators based on photoinduced electron transfer is described. The first part of the review introduces colorimetric and fluorimetric redox indicators. The second part of the review highlights recent developments regarding molecular luminescent redox switches and logic gates. Potential future applications in biology, environmental analysis, biomedical diagnostics, corrosion science and materials science are mentioned.