Fig. 6. Viability of HeLa cells incubated with various concentrations of UCNP–BPNS for 4 h without and with irradiation of 808 nm laser for 30 min (1.5 W cm−2, 10 min break after each 10 min irradiation) for PTT effect, 980 nm laser with power density of 0.5 W cm−2 for 6 min (2 min break after every 2 min irradiation) for PDT effect and simultaneous irradiation with 808 and 980 nm laser for synergistic PTT and PDT effect. HeLa cells in normal culture medium serve as the control group. * Difference in the level of significance (p < 0.05) in comparison to the control. Data are mean cell viability% (n = 6) ± standard deviation.
