p-type (pyrene type) delayed fluorescence usually require very close inter-molecular pi-pi interactions. So the molecules with planar geometry have maximum chances of showing p-type delayed fluorescence.
@Gopal
noticed your much more extended entry at another related question at RG I like to ask you for a really good reference for this type
like to mention that I started my scientific career on pyrene T-T absorption (public 1970)
but this in a solid solution and PhD with fluorescence in the gas-phase
Harry
Dear Prof. Harry
There are number of papers on triplet -triplet annihilation, I could not download due to lack of access. This phenomena is very common in fluorophores like pyrene, anthracene, perylene, porphyrins etc as they have planar geometry which can easily provide the required wavefunction overlap. I will try to provide it as soon as possible.
Regards
Dear Gopal singh thanks for your answer, but I'm asking when the P-type delayed fluorescence happens in only certain organic molecules specially.
@Gopal Singh
I should clarify:
Could you give the references to the publications so I can look these up myself
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