A new procedure for measuring time-resolved emission spectra has been implemented. This technique has subnanosecond time resolution combined with the sensitivity and dynamic range needed to cope with extremely weak luminescence. Using this method the emissions of Cr(NH3)2(NCS)4-and Cr(NCS)63-in aqueous solution at room temperature have each been analyzed into two components. The fast component has a broad spectrum and is assigned to prompt fluorescence with lifetime below 100 ps. The slow component is dominated by phosphorescence but may include some delayed fluorescence. The phosphorescence lifetime is 5.5 ± 0.5 ns in Cr(NH3)2(NCS)4-and 1.65 ± 0.1 ns in Cr(NCS)63-. Order of magnitude estimates have been derived for other photophysical parameters. © 1983.
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