Molecules having charge transfer character sometimes give two emission bands (one from LE state and other from CT state). TCSPC measurements at these two bands give different average life time. Then TCSPC measurement of which band should be considered as average life time of the molecule.
In this case you have two different species i.e. LE state and TICT state.You cannot considered both lifetimes to estimate the average lifetime of a molecule .We nevr do that..
You should always monitor the emission of LE state to get its average lifetime and monitor the TICT emission to get its average lifetime.
Thanks dear Peter for the clarification....Had a nice piece of discussion with you after a long time..(did u remember the MicroTime200 installation in University of Hyd?)
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