Abstract
Optical properties (optical absorption and photoluminescence) of indium-exchanged ZSM-5 zeolite have been characterized. It has been found for the first time that reduced In-ZSM-5, containing low-valence In+ exchanged cations, exhibits efficient ultraviolet and visible-light photoluminescence. The photoluminescence can be induced by the electronic excitation transitions A, B, and C similar to those either in indium halides or in indium-doped alkali halides. The ultraviolet photoluminescence is associated with isolated In+ cations, while the visible-light photoluminescence is most probably due to radiative relaxation of In+ oligomers or low-dimensional clusters.
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