Affiliation:
1. Tianjin Key Laboratory of Functional Crystal Materials, Institute of Functional Crystal, Tianjin University of Technology
2. Tianjin University of Technology
3. State Key Laboratory of Crystal Materials and Institute of Crystal Materials, Shandong University, Jinan 250100 , China
Abstract
Abstract
Divalent lanthanide inorganic compounds can exhibit unique electronic configurations and physicochemical proper-ties, yet their synthesis remains a great challenge because of the weak chemical stability. To the best of our knowledge, although several lanthanide monoxides epitaxial thin films have been reported, there is no chemically stable crystalline divalent lanthanide chalcogenide synthesized up to now. Herein, by using octahedra coupling tet-rahedra single/double chains to construct a novel octahedral crystal field, we synthesized the first stable crystalline La(II)-chalcogenide, LaMg6Ga6S16. The nature of the divalent La2+ cations can be identified by X-ray photoelectron spectroscopy, while the stability is confirmed by the in-situ variable-temperature powder X-ray diffraction and a series of solid-state reactions. Owing to the particular electronic characteristics of La2+(5d1), LaMg6Ga6S16 displays a broad-band green emission at 500 nm under the excitation of 360 nm. Clearly, this is the first time for La(II)-based com-pounds to exhibit luminescent properties.
Publisher
Research Square Platform LLC
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