pH-responsive doped quantum dots with an ultrasmall size (∼3.5 nm), near-infrared emission (∼720 nm) and long lifetime (∼1 μs), which exhibit a linear response range from pH 5.5 to 7.0 with the maximum change in the fluorescence lifetime up to ∼600 nm, were synthesized as lifetime-based pH nanosensors for in vivo imaging.
C. Chen, P. Zhang, L. Zhang, D. Gao, G. Gao, Y. Yang, W. Li, P. Gong and L. Cai, Chem. Commun., 2015, 51, 11162 DOI: 10.1039/C5CC03046C
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