Lanthanide-doped LiYF4 nanoparticles: Synthesis and multicolor upconversion tuning |
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| Authors: | Juan Wang Feng Wang Jun Xu Yong Wang Yongsheng Liu Xueyuan Chen Hongyu Chen Xiaogang Liu |
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| Institution: | 1. Department of Chemistry, National University of Singapore, Singapore 117543;2. Division of Chemistry and Biological Chemistry, Nanyang Technological University, Singapore 637371;3. Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China |
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| Abstract: | We report the synthesis of tetragonal-phase LiYF4 nanoparticles doped with upconverting lanthanide ions. The nanoparticles have been characterized by XRD, TEM, and luminescence decay studies. The size of the as-synthesized LiYF4 nanoparticles can be tuned by varying the precursor ratio of F to lanthanide ions. Passivated by oleic acid ligands, the LiYF4 nanoparticles can be readily dispersed in a wide range of nonpolar solvents including hexane, cyclohexane, dichloromethane, and toluene. The lanthanide-doped (Yb3+, Er3+, Tm3+, Ho3+) LiYF4 nanoparticles show intense upconversion emissions upon near infrared excitation at 980 nm. By varying composition and concentration of the dopant ions, the color output can be precisely modulated under single wavelength excitation with a diode laser. |
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