And I forgot to mention in connection with the luminol phosphorescence, your teacher may be right and the diagram in the Wikipedia article and elsewhere may be wrong.
Wiki indicates,
T1 –�?gt; S1 –�?gt; So + light (Intersystem crossing, then fluorescence.)
(Two steps.)
But typical Jablonski diagram would indicate,
T1 –�?gt; S0 + light (No intersystem crossing, just all at once with phosphorescence.)
(One step or two steps?)
I think your teacher was saying that the the Wiki pathway is wrong because it would not go from T1 to S1 first, as in the first pathway, just straight to S0 according to the second pathway. But I would like to know what's going on between T1 and S0 in the second pathway. 
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