Surface Enhanced Luminescence with Silver Exchanged Zeolites
Silver clusters have been produced in zeolites by a variety of different synthetic routes by several research groups. The types of clusters produced are quite dependent on the type of zeolite, concentration of silver, and type of activation. We have been studying the enhancement of luminescence of luminophores such as rhodamine in the presence of a variety of silver clusters in zeolites. The enhancement of luminescence has been studied with steady state and lifetime methods. The type of silver clusters present in the zeolites has been characterized by diffuse reflectance, luminescence, and electron paramagnetic resonance methods. The data suggest that several silver clusters are present when surface enhanced luminescence is observed. Since deposition of rhodamine onto the silver exchanged zeolites causes a change in the types of silver species it is necessary to characterize the clusters after deposition of the luminophore. Factors influencing the surface enhanced luminescence will be discussed.
KeywordsElectron Paramagnetic Resonance Luminescence Intensity Silver Cluster Electron Paramagnetic Resonance Method Silver Island
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