At high concentrations of the phosphorescent polyelectrolyte, intermolecular interactions can occur, leading to self-quenching. This is often observed when the molecules are in close proximity, and energy transfer or collisional quenching is more likely to occur.
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Acetic acid, 2,2'-[(2,5-diiodo-1,4-phenylene)bis(oxy)]bis-
4-(2,7-dibromo-9-hydroxy-9H-fluoren-9-yl)benzaldehyde
