Highly Luminescent and Multifunctional Zero-Dimensional Cesium Lanthanide Chloride (Cs3LnCl6) Colloidal Nanocrystals
- Authors
- Lee, M.; Lee, D.H.D.; Hong, S.V.; Woo, H.Y.; Chae, J.-Y.; Lee, D.W.; Han, M.J.; Paik, Taejong
- Issue Date
- May-2022
- Publisher
- John Wiley and Sons Inc
- Keywords
- luminescence; nanocrystals; perovskite variants; rare earth; upconversion
- Citation
- Advanced Optical Materials, v.10, no.9
- Journal Title
- Advanced Optical Materials
- Volume
- 10
- Number
- 9
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/55689
- DOI
- 10.1002/adom.202102727
- ISSN
- 2195-1071
2195-1071
- Abstract
- Herein, the synthesis of novel, highly luminescent, and nearly monodisperse zero-dimensional (0D) cesium lanthanide chloride (Cs3LnCl6; Ln = Y, Ce, Gd, Er, Tm, Yb) colloidal nanocrystals (NCs) is reported for the first time. The Cs3LnCl6 NCs are synthesized using a heating-up method and exhibit highly uniform size and shape. The monoclinic-phase Cs3LnCl6 NCs contain completely isolated [LnCl6]3− octahedral units, resulting in 0D ternary metal halide structures. Therefore, these NCs exhibit deep-blue photoluminescence under ultraviolet excitation, and this photoluminescence can be tuned by changing the lanthanide cations within the [LnCl6]3− octahedral units. High photoluminescence quantum yields of up to 60% and 90% are observed for the Cs3YbCl6 and Cs3YCl6 NCs, respectively, at room temperature and under ambient conditions. The Cs3LnCl6 NCs exhibit characteristic optical and magnetic properties owing to the f-orbitals of the lanthanide elements. For example, near-infrared-to-visible upconversion luminescence appears when Cs3LnCl6 NCs are doped with Er3+ and Yb3+ ions. In addition, the Cs3GdCl6 NCs demonstrate paramagnetic properties owing to the unpaired electrons within the f-orbitals of the trivalent gadolinium ions. This study provides guidance for the rational design and synthesis of novel lanthanide-based 0D metal halide NCs, which can potentially be used as highly efficient, multifunctional NC emitters. © 2022 Wiley-VCH GmbH
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