Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/13961
Title: Luminescence tuning and white-light emission of co-doped Ln-Cd-organic frameworks
Authors: Ablet, A
Li, SM
Cao, W
Zheng, XJ
Wong, WT 
Jin, LP
Keywords: Crystal structures
Ligands
Luminescence
Metal-organic frameworks
White-light emission
Issue Date: 2013
Source: Chemistry - An Asian journal, 2013, v. 8, no. 1, p. 95-100 How to cite?
Journal: Chemistry - An Asian Journal 
Abstract: Four new three-dimensional isostructural lanthanide-cadmium metal-organic frameworks (Ln-Cd MOFs), [LnCd2(imdc)2(Ac)(H 2O)2] H2O (Ln=Pr (1), Eu (2), Gd (3), and Tb (4); H3imdc=4,5-imidazoledicarboxylic acid; Ac=acetate), have been synthesized under hydrothermal conditions and characterized by IR, elemental analyses, inductively coupled plasma (ICP) analysis, and X-ray diffraction. Single-crystal X-ray diffraction shows that two LnIII ions are surrounded by four CdII ions to form a heteronuclear building block. The blocks are further linked to form 3D Ln-Cd MOFs by the bridging imdc 3- ligand. Furthermore, the left- and right-handed helices array alternatively in the lattice. Eu-Cd and Tb-Cd MOFs can emit characteristic red light with the EuIII ion and green light with the TbIII ion, respectively, while both Gd-Cd and Pr-Cd MOFs generate blue emission when they are excited. Different concentrations of Eu3+ and Tb 3+ ions were co-doped into Gd-Cd/Pr-Cd MOFs, and tunable luminescence from yellow to white was achieved. White-light emission was obtained successfully by adjusting the excitation wavelength or the co-doping ratio of the co-doped Gd-Cd and Pr-Cd MOFs. These results show that the relative emission intensity of white light for Gd-Cd:Eu3+,Tb3+ MOFs is stronger than that of Pr-Cd:Eu3+,Tb3+ MOFs, which implies that the Gd complex is a better matrix than the Pr complex to obtain white-light emission materials.
URI: http://hdl.handle.net/10397/13961
ISSN: 1861-4728
DOI: 10.1002/asia.201200813
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