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(a) Photograph of crystals of 26 under 365 nm irradiation. (b) Normalized UV–vis absorption (black solid line) and emission (blue solid line) of 26 in chloroform. Green solid line: photoluminescence emission (weak fluorescence and strong phosphorescence) of crystals of 26. (c) Time-resolved measurement of emission at 530 nm from 26 crystals. Phosphorescence lifetime and quantum yield are given in the inset. Reproduced with permission from ref (46).
