Figure 11.

a) Confocal UCL image and b) its overlay with a bright‐field image of cells stained with 200 μg mL⁻¹ citric acid‐coated β‐NaLuF₄ UCNPs for 2 h at 37 °C. In vivo UCL imaging of athymic nude mice after a) subcutaneous injection of 50 KB cells and d) vein injection of 1000 cells. The KB cells were incubated with 200 μg mL⁻¹ citric acid‐coated β‐NaLuF₄ UCNPs 2 h. Reproduced with permission.77 Copyright 2011, American Chemical Society.