Extending the excitation wavelength from UV to visible light for a europium complex-based mitochondria targetable luminescent probe for singlet oxygen.

A visible-light-excitable Eu3+ complex-based luminescent probe, [Eu(pdap)3(DPBT)], has been proposed for time-gated luminescence imaging of singlet oxygen in the mitochondria of living cells, as well as in tumor tissues and laboratory animals. Extension of the excitation window to the visible-light region makes the probe more favorable for practical usage.