Journal
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Volume 2020, Issue 4, Pages 394-399Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.201901263
Keywords
Luminescence; Switchable dielectrics; Phase transitions; Manganese; Organic-inorganic hybrid composites
Categories
Funding
- National Key Research and Development Program of China [2017YFA0204800]
- National Natural Science Foundation of China [21522101]
- Fundamental Research Funds for the Central Universities [2242017K41027]
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A series of multifunctional photoluminescent materials, [pyrrolidinium](2)MnBr4 (1), [N-methylpyrrolidinium](2)MnBr4 (2), and [N-methylpyrrolidinium]MnBr3 (3), were obtained by means of regulating diverse organic cations and different coordination modes of inorganic metal ions. Interestingly, compounds 1, 2, and 3 exhibit different dielectric switching and relaxation behavior in the process of structural transformations. Furthermore, compounds 1, 2, and 3 possess intriguing photoluminescence properties. When subjected to UV light, tetrahedrally coordinated compound 1 shows extraordinarily strong green light emission with a high quantum yield of 51.41 %. By changing the organic cation, compound 2 exhibits an unusual orange emission under ultraviolet excitation, which is different from that of conventional tetrahedrally coordinated manganese-based compounds. By the regulation of coordination modes of inorganic metal ions, octahedrally coordinated compound 3 emits bright red light with a high quantum yield of 36.76 %. This finding may open a new approach toward designing multifunctional photoluminescent materials.
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