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《Chinese Journal of Luminescence》 2007-01
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Luminescent Properties and Selectivity IR Adsorption of Eu-doped Hydrotalcite-like Compounds

LIU Jian-cai,LIAN Shi-xun,ZHU Ai-ling,LI Qi-hua,LIU Li-ming,ZENG Li-hua(Key Laboratory of Chemical Biology & Traditional Chinese Medicine Research,Ministry of Education;College of Chemistry and Chemical Engineering,Hunan Normal University,Changsha 410081,China)  
Hydrotalcite-like compounds(HTlcs),which are formulated as [M2+1-xM3+x(OH)2]An-n/x·mH2O have received increase interest owing to their particular properties such as infrared absorption.The properties are derived from their special layers structure,which are made of metal cations(M2+ and M3+)of similar ionic radii and coordinated by six oxygen atoms forming M2+/M3+(OH)6 octahedra.Luminescent materials containing rare-earth ions have been special interest for their sharp and intense emission bands based on f→f transitions of rare-earth ions.In fact,europium compounds are the most widely used due to their efficient red-emitting luminescence,so doping of europium ions into HTlcs makes it possible to combine the optical properties of molecular compounds with the mechanical and chemical stability of a solid matrix.Therefore,it suggests that there is a new method of designing dual-functional materials.In order to getting dual-functional materials with red luminescence and selectivity IR adsorption properties,we studied the HTlcs compound containing Eu3+ ions.The samples of Mg-Al-Eu-hydrotalcite-like compounds(MgAlEuCO3-HTlcs)were prepared by co-precipitation and through hydrothermal treatment.Results of XRD showed that the pure MgAlEuCO3-HTlcs were obtained from solution of magnesium,aluminium and europium nitrates,n(Mg2+)∶n(Al3+)=3,n(Eu3+)∶[n(Al3+)+n(Eu3+)]=5%~50%,by co-precipitation with a mixture of sodium carbonate and hydroxide at a fixed pH value of 10±0.1,and hydrothermal treating at 100 ℃ for 8 h.The MgAlEuCO3-HTlcs crystallinity decreases with increasing Eu3+ dosage in the synthesis mixture,and the value of d110 of MgAlEuCO3-HTlcs is more larger in XRD at one time.Three intense IR bands of FT-IR spectra at 600~900 cm-1,1 250~1 350 cm-1 and 3 420~3 480 cm-1 are argument with MOH(M=Mg,Al,Eu),CO3 and OH stretching vibrations,respectively.Under excitation by 399 nm,there are three sharp emissions peaked at 594,620 and 700 nm in emission spectrum of MgAlEuCO3-HTlcs,which belong to the 5D0→7FJ(J=1,2,4)transition of Eu3+ ion.Besides,the intensity of luminescence changed with the increasing of Eu/Al molar ratio.All of results revealed that a few Al3+ ions in layers of HTlcs were replaced by Eu3+ ions in our samples.It was found that the MgAlEuCO3-HTlcs compound is a novel dual-function material with selectivity absorbing infrared wavelength and red luminescence.
【Fund】: 国家自然科学基金资助项目(20371017)
【CateGory Index】: O482.31
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