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The rhodamine 6G+‐perphenazine (Rhod 6G+–PPH) compound is formed in the ester‐exchange reaction between ‐OH of PPH and ‐COOC2H5 of Rhod 6G+. PPH was oxidized to a red compound (PPH') in the presence of K2S2O8. Interestingly, the room temperature phosphorescence (RTP) of Rhod 6G+ was quenched because the ‐OH of PPH′ reacted with ‐COOC2H5 of Rhod 6G+–PPH to form Rhod 6G+–PPH’ and PPH, which decreased...
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