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JOURNAL OF MOLECULAR LIQUIDS · 2022 · IF 6.633

Separation of lithium isotopes: Electromigration coupling with crystallization

Ciming Wang,Huiqun Ju,Xiaolong Zhou,Pengrui Zhang,Zixuan Xue,Lianjing Mao,Fei Shao,Yan Jing,Yongzhong Jia,Jinhe Sun

6 Li and 7 Li, two natural isotopes of lithium, play an important role in the nuclear industry. Here, a system of ionic liquid-crown ether was fabricated for lithium isotope separation and the 6 Li isotope separation coefficient can reach 1.406 that showing a good prospect for lithium isotope separation by this method of electromigration. Interestingly, the single crystal containing crown ether and lithium, in which 7 Li was enriched, was obtained from the experiments. It is contrary to popular wisdom and can be attributed to the steric hindrance effect. This provides a new route to separate lithium isotopes, that is electromigration coupling with crystallization.

研究领域: 核科学 · 材料科学 · 化学工程

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Inorganic Chemistry Frontiers · 2026 · IF 6.2

Ba 2+ Co-doping Enhances Phase Purity and Enables Narrow-Band Green Emission in Sr 5/6 Li 17/6 Al 7/6 O 4 :Eu 2+ Phosphor for Backlight Display Applications

Chenyang Zhan,Zihao Wang,Sisi Liang,Zhi-Ying Zhao,Hanru Chen,Jiahe Yu,Haomiao Zhu

Alkaline earth lithoaluminates with the UCr4C4-type structure have demonstrated considerable potential in achieving narrow-band emissions from Eu 2+ . However, obtaining single-phase powder samples with green-emitting remains challenging. In this study, we address this issue by co-doping Ba 2+ into the novel UCr4C4-type system Sr5/6-xBaxLi17/6Al7/6O4:Eu 2+ , which significantly enhances phase purity and structural homogeneity. This approach not only reduces the emission bandwidth from 66 nm (2241 cm -1 ) to 51 nm (1830 cm -1 ) but also induces a blue shift to 529 nm, fine-tuning the emission into the desired deep green region. Through detailed mechanistic studies-including low-temperature spectroscopy and luminescence decay analysis-we identify the presence of multiple Eu 2+ emission centers associated with distinct Sr 2+ sites. Ba 2+ doping is shown to promote dominant Eu 2+ emission in the green spectral region, thereby facilitating spectral narrowing.The optimized phosphor achieves a high absorption efficiency of 64.6% and an external quantum yield of 22.2%. When integrated into a white LED prototype, it enables a color gamut covering 97.6% of the NTSC (National Television System Committee) standard, outperforming a commercial β-SiAlON:Eu 2+ -based device. This study provides an effective cationic codoping strategy for designing high-performance narrow-band oxide phosphors and highlights a promising candidate for nextgeneration display technologies.

CAS / MDL: 12057-24-8 1308-96-9 1314-11-0 1344-28-1 513-77-9

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Separation of lithium isotopes: Electromigration coupling with crystallization

Ba 2+ Co-doping Enhances Phase Purity and Enables Narrow-Band Green Emission in Sr 5/6 Li 17/6 Al 7/6 O 4 :Eu 2+ Phosphor for Backlight Display Applications