Reversible emission evolution of thermally treated Ag activated zeolite Na-A upon dehydration/hydration in vacuum/water vapor was observed. The phenomenon was observed even for the sample with low Ag+-Na+ exchanging (8.3%), indicating that the emission from Ag activated zeolites may not come from Ag clusters while from the surrounding coordinated Ag+ ions or Ag0 atoms. It was disclosed that the characteristic yellow-green emission at ∼560 ± 15 nm is strongly associated with the coordinating water molecules to the Ag+ ions or Ag0 atoms, which is clear evidence for that the efficient emission from Ag activated zeolites may not originate from the quantum confinement effect.
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Lin et al. (2014) studied this question.
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