Structure and photoluminescence of Mg–Al–Eu ternary hydrotalcite-like layered double hydroxides

• Published in: Journal of solid state chemistry 2010-09, Vol.183 (9), p.2222-2226
• Main Authors: Chen, Yufeng, Li, Fei, Zhou, Songhua, Wei, Junchao, Dai, Yanfeng, Chen, Yiwang
• Format: Article
• Language: English
• Subjects: ALKALINE EARTH METAL COMPOUNDS; ALUMINIUM COMPOUNDS; ALUMINIUM IONS; Aluminum; Asymmetry; CHARGED PARTICLES; COHERENT SCATTERING; Condensed matter: electronic structure, electrical, magnetic, and optical properties; COPRECIPITATION; Crystallinity; DIFFRACTION; EMISSION; Eu ions emissions; EUROPIUM COMPOUNDS; EUROPIUM IONS; Exact sciences and technology; HYDROGEN COMPOUNDS; HYDROXIDES; INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; IONS; LUMINESCENCE; Magnesium; MAGNESIUM COMPOUNDS; MAGNESIUM IONS; Mg–Al–Eu ternary LDHs; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; OXYGEN COMPOUNDS; PHOTOLUMINESCENCE; PHOTON EMISSION; Physics; PRECIPITATION; RARE EARTH COMPOUNDS; SCATTERING; SEPARATION PROCESSES; Spectral emissivity; X-RAY DIFFRACTION
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2010.07.042

A series of Mg–Al–Eu ternary hydrotalcite-like layered double hydroxides (LDHs), with Eu/Al atomic ratios of ∼0.06 and Mg/(Al+Eu) atomic ratios ranging from 1.3 to 4.0, were synthesized by a coprecipitation method. The Mg–Al–Eu ternary LDHs were investigated by various techniques. X-ray diffraction (XRD) results indicated that the crystallinity of the ternary LDHs was gradually improved with the increase of Mg 2+/(Al 3++Eu 3+) molar ratio from 1.3/1 to 4/1, and all the samples were a single phase corresponding to LDH. The photoluminescent (PL) spectra of the ternary Mg–Al–Eu LDHs were described by the well-known 5 D 0– 7 F J transition ( J=1, 2, 3, 4) of Eu 3+ ions with the strongest emission for J=2, suggesting that the host LDH was favorable to the emissions of Eu 3+ ions. The asymmetry parameter ( R) relevant to 5 D 0– 7 F J transition ( J=1, 2) dependant of the atomic ratios of Mg 2+/(Al 3++Eu 3+) was discussed, and was consistent with the result of XRD. A series of Mg–Al–Eu ternary hydrotalcite-like layered double hydroxides (LDHs), with Mg/(Al+Eu) atomic ratios ranging from 1.3/1, 2/1 3/1 to 4/1, were synthesized by a coprecipitation method. The photoluminescent spectra of the Mg–Al–Eu ternary LDHs are described by the well-known 5 D 0– 7 F J transition ( J=1, 2, 3, 4) of Eu 3+ ions with the strongest emission for J=2. [Display omitted]