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In this paper, we demonstrate energetically conjoined triplet–triplet annihilation-assisted photon energy upconversion (UC) operating in an aqueous environment. Obtained micellar structures show very efficient UC emission in a water environment under extremely low excitation light intensity, down to 10 mW cm −2 . The demonstrated sub-linear intensity dependence of the UC emission is of crucial importance for life science applications, allowing upconverted photons to be generated even at low intensity that then serve as a local, in situ , optical excitation source for subsequent light-triggered processes.
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Turshatov et al. (2011) studied this question.
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