I have seen a number of publications state that organic radicals often exhibit quenched photo-luminescence, yet offer no explanation as to why. Can someone offer a physical explanation as to why this would be the case? This question is particularly puzzling to me as you can clearly see polaronic or excitonic absorption bands in an absorption spectrum corresponding to the excitation of the radical anion. Why then does it not luminesce when excited at these wavelengths?
Richard O. Ocaya
Absorption does not necessarily guarantee photo luminescence since plasmon induced oscillations could also increase in intensity at specific resonance frequencies.This reduces the photo luminescence intensity, which is termed quenching.
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