Synthesis of Colloidal Upconverting NaYF4: Er3+/Yb3+ and Tm3+/Yb3+ Monodisperse Nanocrystals

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• 作者：John-Christopher Boyer ; Louis A. Cuccia ; John A. Capobianco
• 刊名：Nano Letters
• 出版年：2007
• 出版时间：March 2007
• 年：2007
• 卷：7
• 期：3
• 页码：847 - 852
• 全文大小：468K
• 年卷期：v.7,no.3(March 2007)
• ISSN：1530-6992

文摘

The synthesis, characterization, and spectroscopy of upconverting lanthanide-doped NaYF₄ nanocrystals (NCs) is presented. The monodispersecubic NaYF₄ NCs were synthesized via a thermal decomposition reaction of trifluoroacetate precusors in a mixture of technical grade chemicals,octadecene and the coordinating ligand oleic acid. In this straightforward method, the dissolved precursors are added slowly to the reactionsolution through a stainless-steel canula resulting in highly luminescent nanocrystals with an almost monodisperse particle size distribution.The NCs were characterized through the use of transmission electron microscopy, selected area electron diffraction, ¹H NMR, powder X-raydiffraction, and high-resolution luminescence spectroscopy. The NaYF₄ NCs are capable of being of dispersed in nonpolar organic solventsthus forming colloidally stable solutions. The colloids of the Er³⁺, Yb³⁺ and Tm³⁺, Yb³⁺ doped NCs exhibit green/red and blue upconversionluminescence, respectively, under 980 nm laser diode excitation with low power densities.