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Normalized emission spectra (plain lines) of single crystals of 1, 3, and 4 excited at 380 nm in the air atmosphere; normalized excitation spectra (dashed lines) recorded at the maximum of emission (A). Phosphorescence decay kinetics of single crystals of 1, 3, and 4 in the air atmosphere, excited at 380 nm, recorded at the maximum of emission (B).
