Systematic Tuning of the Luminescent Properties of Self-Activated ZnGa2O4 Phosphors by Cd Ion Substitution
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چکیده
The e4ect of host compositions on the luminescent properties of spinel-type ZnGa2O4 phosphors was investigated by systematic substitution of Cd for Zn in the host lattice. A continuous solid solution with the composition (Zn12xCdx)Ga2O4 (04x41.0) was synthesized at 9503C as self-activated phosphors, as indicated by X-ray di4raction (XRD) analysis. With increasing substitution of Cd the emission and excitation wavelengths (kem and kexc) of self-activated (Zn12xCdx)Ga2O4 were observed to exhibit a red shift, as indicated by photoluminescence spectral analysis. Similar results were also con5rmed by cathodoluminescence data. Our observations are attributed to the systematic narrowing of the energy gap of the host attributed to expanding lattice dimensions induced by Cd substitution. A CIE chromaticity diagram manifests the e4ect of Cd doping on variation of hue for the (Zn12xCdx)Ga2O4 gallate phosphors. ( 2000 Academic Press
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تاریخ انتشار 2000