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(a) TTA upconversion emission spectra with [Pt(L3 )(acac)] as the photosensitizer and DPA as the acceptor in deaerated DCM. The asterisks indicate the scattered laser. (b) Photographs of [Pt(L3 )(acac)] alone and the upconversion. (c) Photographs of upconversion solutions observed with band‐pass filter (transparent in the range 380–520 nm). Excited with a 473 nm cw‐laser with a power density of 80 mW cm−2. c [PSs]=1.0×10−5 M, c [DPA]=3.0×10−5 M, 25 °C.
