Fluorescence (a) and phosphorescence (b, c) images of CDs@SiO2
-treated onion bulb epidermal tissue. Note that the delay times for (b) and (c) are 0.5 and 1 s, respectively. Scale bar: 200 μ
m. (d–f) Bright-field, fluorescence, and phosphorescence images of CDs@ SiO2
-treated mouse breast carcinoma EM-6 cells. The delay time for (f) is 1 s. Scale bar: 50 μ
m (adapted and copyright permission [46
] (a–f), American Chemical Society).