Fig. 4. (a) Time-gated emission spectra (λ ex = 330 nm) of the RTLNP (50 μg ml–1) in the presence of different concentrations of HClO in 1 : 4 ethanol–0.05 M PBS buffer of pH 7.4 (the inset shows the luminescence colors of the solutions under a 360 nm UV lamp). (b) The I 539/I 607 ratio response of the RTLNP to different concentrations of HClO. (c) Time course of luminescence intensity of the RTLNP at 607 nm upon addition of 100 μM HClO. (d) The I 539/I 607 ratio response of the RTLNP (50 μg ml–1) toward HClO (40 μM) and other ROS and RNS (100 μM).
