Luminescence tuning and white-light emission of co-doped Ln-Cd-organic frameworks

Ayjamal Ablet, Shu Mu Li, Wei Cao, Xiang Jun Zheng, Wing Tak Wong, Lin Pei Jin

Research output: Journal article publicationJournal articleAcademic researchpeer-review

55 Citations (Scopus)

Abstract

Four new three-dimensional isostructural lanthanide-cadmium metal-organic frameworks (Ln-Cd MOFs), [LnCd2(imdc)2(Ac)(H2O)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 LnIIIions are surrounded by four CdIIions to form a heteronuclear building block. The blocks are further linked to form 3D Ln-Cd MOFs by the bridging imdc3-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 EuIIIion and green light with the TbIIIion, respectively, while both Gd-Cd and Pr-Cd MOFs generate blue emission when they are excited. Different concentrations of Eu3+and Tb3+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.
Original languageEnglish
Pages (from-to)95-100
Number of pages6
JournalChemistry - An Asian Journal
Volume8
Issue number1
DOIs
Publication statusPublished - 1 Jan 2013

Keywords

  • crystal structures
  • ligands
  • luminescence
  • metal-organic frameworks
  • white-light emission

ASJC Scopus subject areas

  • Chemistry(all)

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