Kai Li, Jia-Qi Du, Cen-Man Wang, Guoli Yang, Jin Kang, Yong-Qiang Chen
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引用次数: 0
Abstract
Zero-dimensional (0D) hybrid manganese halides have received substantial attention due to their excellent optoelectronic properties. Herein, a 0D hybrid manganese bromide [DMPBA]2[MnBr4] (DMPBA+ = Dimethylphenylbenzylammonium) was successfully synthesized. In the structure, there are not only Coulomb interactions but also strong C − H⋅⋅⋅Br hydrogen-bonding forces between [MnBr4]2− and DMPBA+ building units. This compound exhibits a typical green emission with a high photoluminescence (PL) quantum yield value of 62.39 %. Meanwhile, [DMPBA]2[MnBr4] possesses a long lifetime of 1.3 ms at room temperature, which is far higher than those of reported 0D hybrid manganese bromides. Theoretical calculations show that [DMPBA]2[MnBr4] has a direct bandgap electronic structure with a band gap value of 2.58 eV where the valence band maximum and conduction band minimum are entirely governed by [MnBr4]2− units. As the temperature increases from 120 to 400 K, the PL emission of [DMPBA]2[MnBr4] presents a monotonically blue shift, which is ascribed to the decreased crystal field strength of Mn2+ owing to the effect of lattice thermal expansion. In addition, [DMPBA]2[MnBr4] exhibits a crystal-glass transition behavior and the glassy sample shows a near-yellow emission under UV light excitation.
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