If an organic molecular emitter shows multiple photoluminescence bands, what tools and techniques can one use to confirm the triplet-triplet annihilation (TTA) band?
Dear Kalyan J Kalita,
If we are talking about own T-T annihilation, then only according to the concentration dependence of the substance under study.
Vladimir S. Pavlovich
TTA emission will have a quadratic dependence on incident light intensity, where other (1 photon) types of emission will have a linear dependence.
I think, the delayed fluorescence includes afterglows with spec- tra similar to those of pigment fluorescence: the phosphorescence corresponds to light emissions accompanying radiative electronic transitions from triplet to ground states of pigment molecules. For further information use the following research article for your reference:
You can consider to measure emission in viscous solvent, in gradually decreasing temperature up to 77 K, and with changing concentration. For details you consult and cite this paper. https://pubs.acs.org/doi/10.1021/acs.jpcb.1c06498
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