Synthesis and photoluminescence of Eu-doped Zn/Al layered double hydroxides
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Eu-doped ZnAl-layered double hydroxides (ZnAl–LDHs) with various Zn2+/(Al3++Eu3+) molar ratios from 1:1, 2:1, 3:1, to 4:1 were first synthesized by the coprecipitation method at room temperature and the Eu3+/Al3+ molar ratio of 0.06 was almost maintained. The obtained solids were characterized by powder X-ray diffraction (XRD), photoluminescent spectrum (PL), scanning electron microscope (SEM), infrared spectroscopy (IR), and thermogravimetric (TG) analysis. XRD results show that the crystallinity of the Eu-doped products gradually was improved when the Zn2+/(Al3++Eu3+) molar ratio was higher than 2. The photoluminescent spectra of the Eu-doped ZnAl–LDHs are described by the well-known 5 D 0–7 F J transition (J = 1, 2, 3, 4) of Eu3+ ions with the strongest emission for J = 2.
KeywordsLayered Double Hydroxide Hydrotalcite Coprecipitation Method Interlayer Water EuCl3
The Project Supported by the National Natural Science Foundation of China (50902067), the Natural Science Foundation of Jiangxi Province (2007GZC1727 and 2008GQH0046), and Program for Innovative Research Team in University of Jiangxi Province.