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Cd(5 3P1)-Photosensitized luminescence of N,N,N',N'-tetramethyl-l,3-propanediamine has been studied under the conditions of steady-state illumination and pulsed laser excitation. There are two emission bands for the sensitized luminescence, the quantum yields of which were determined as well as t h e overall quenching rate constant of Cd(5 3P1) by the steady-state experiment. The temporal profiles of the two emission bands and that of the resonance fluorescence were measured under pulsed excitation conditions. It is suggested that both the emitters of t h e two bands are formed directly from Cd(5 3P1) and there are collision-induced mixing processes between these two kinds of emitters. The energy and entropy differences between these emitters were estimated.