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1O2 phosphorescence signals observed at 1275 nm for optically matched solutions at 532 nm of porphycene 2 (blue solid lines) and reference PSs (green dashed lines) in water (a) or in MeOH (b). Inset: signal magnification of 2 in water. 5,10,15,20-tetrakis(m-hydroxyphenyl)-21H,23H-porphine (m-THPP) in MeOH (a) and 5,10,15,20-tetrakis(N-methyl-4-pyridyl)-21H,23H-porphine (TMPyP) in water (b) are the chosen reference PSs.
