Fig. 5.

Spectral independence of Eu³⁺-doped NPs with fluorescently-tagged cells observed in a microfluidic device. (A) Eu³⁺-doped NPs co-encapsulated with GFP-HeLa cells. * denotes NPs and # denotes GFP-HeLa cell across the droplet. (B) Co-encapsulation of EthD-1 (dead stain)-stained MDA-MB-231 cells with Eu³⁺-doped NPs. Dead cells are shown in red and live cells remained colourless. Magenta box identifies a droplet with only NPs, red box identifies a dead cell with NPs, and green box shows a live cell with NPs. In (B), Eu³⁺-doped NPs are depicted in magenta to distinguish from the dead cells (red). Scale bar is 70 µm.