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. Author manuscript; available in PMC: 2017 Oct 28.
Published in final edited form as: ACS Sens. 2016 Sep 20;1(10):1244–1250. doi: 10.1021/acssensors.6b00452

Figure 3.

Figure 3

Ratiometric response of the sensor to hypoxia in HeLa cells incubated under 19.8% O2 (top row) and hypoxic 6.9% O2 (bottom row) levels overnight. Emission from perylene dye (472 nm) was observed due to visible 427 nm excitation, while the QD channel was observed at 775 nm using 365 nm excitation.