Synthesis, crystal structure and optical property of manganese (II) halides based on pyridine ionic liquids with high qu
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Synthesis, crystal structure and optical property of manganese (II) halides based on pyridine ionic liquids with high quantum yield Lingyan Li1 · Lei Li1 · Qianqian Li1 · Yiming Shen1 · Shangke Pan1,2 · Jianguo Pan1,2 Received: 9 January 2020 / Accepted: 29 April 2020 © Springer Nature Switzerland AG 2020
Abstract Two novel tetrahedral Mn (II) halide single-crystals [(C7H10N)2][MnCl4] (1) and [(C7H10N)2][MnBr4] (2), based on pyridine ionic liquids, have been successfully prepared. Centimeter-sized single crystal 2 was grown through bottom seed-solution temperature-lowering method, while the 1 was synthesized by solvent slow evaporation. Structure elucidation results indicate that the two crystals crystallize in the different space groups of the same monoclinic system. Significantly, the solid crystal 2 is possessed of superior luminescence properties than 1 at room temperature. Excited by ultraviolet light, the 1 and 2 emit intense green emission bands derived from the Mn (II) 4T(G) energy level. The fluorescent lifetimes are 384.43 and 187.83 μs, respectively, and quantum yields are 82% and 12%, respectively. Furthermore, under the excitation of X-ray, the 2 exhibits prominent X-ray fluorescence performance.
Introduction At present, the research on organic-transition metal halide (OTMH) emitting materials has gradually shifted to their optimal properties such as large size, lead-free and rare earth-free, high emissive efficiency and multi-functionality [1–12]. Large-sized halide emitting materials with high emission efficiency have always been the research goal in optical material fields. Designing novel OTMH emitting materials [6–8, 13–19], the high quantum yields of emitting materials have been enhanced during the last two decades. For novel OTMHs, the transition metal ions occupy all the lattice sites in OTMHs, and the quantum yield is not affected by concentration quenching [15, 19–21]. Among Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11243-020-00393-w) contains supplementary material, which is available to authorized users. * Shangke Pan [email protected] * Jianguo Pan [email protected] 1
State Key Laboratory Base of Novel Functional Materials and Preparation Science, School of Material Science and Chemical Engineering, Ningbo University, Zhejiang 315211, China
Key Laboratory of Photoelectric Detection Materials and Devices of Zhejiang Province, Ningbo 315211, China
2
them, Mn (II)-based OTMHs system is far superior to others about quantum yield [7, 18, 20]. Moreover, compared with conventional halides and lead halide perovskite, Mn (II) halides possess a great many merits like facile preparation process, high luminous intensity, high thermal stability, low toxicity and cost-friendly [21, 22]. As report goes, Mn (II) halides generate fluorescence emitting from green to deep-red because of the different crystal field and ligands [7, 23, 24]. For instance, the tetrahedral Mn (II) halide, (diisopropylammonium)2MnBr4 (DIPA2MnBr4), emit
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