Volume 55, Issue 19 pp. 5718-5722
Communication

Unraveling Epitaxial Habits in the NaLnF4 System for Color Multiplexing at the Single-Particle Level

Yuhai Zhang

Yuhai Zhang

Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543 Singapore

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Prof. Ling Huang

Corresponding Author

Prof. Ling Huang

Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergistic Innovation Center for Advanced Materials, Nanjing Tech University, 30 South Puzhu Road, Nanjing, 211816 China

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Prof. Xiaogang Liu

Corresponding Author

Prof. Xiaogang Liu

Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543 Singapore

Institute of Materials Research and Engineering, Agency for Science, Technology and Research, 3 Research Link, Singapore, 117602 Singapore

Center for Functional Materials, NUS (Suzhou) Research Institute, Suzhou, Jiangsu, 215123 China

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First published: 01 April 2016
Citations: 88

Graphical Abstract

Pimp my particles: Fine control of crystal epitaxial growth was achieved with a NaLnF4 system by using a modified hydrothermal method. On the basis of kinetic and thermodynamic investigations, it is shown that by precisely controlling shell thickness and growth orientation it is possible to grow microparticles with multicolor emitting capabilities at the single-particle level.

Abstract

We report an epitaxial growth technique for scalable production of hybrid sodium rare-earth fluoride (NaLnF4) microcrystals, including NaYF4, NaYbF4, and NaLuF4 material systems. The single crystalline nature of the as-synthesized products makes them strong upconversion emission. The freedom of combining a lanthanide activator (Er3+ or Tm3+) with a sensitizer (Yb3+) at various doping concentrations readily gives access to color multiplexing at the single-particle level. Our kinetic and thermodynamic investigations on the epitaxial growth of core–shell microcrystals using NaLnF4 particle seeds suggest that within a certain size regime it is plausible to exert precise control over shell thickness and growth orientation under hydrothermal conditions.

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