Phase Control of Nanosized NaYF4 Upconversion Particles

Jing Guo; Fei Zhong Ma; Ying Shi; Jian Jun Xie

doi:10.4028/www.scientific.net/KEM.512-515.235

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 512-515Phase Control of Nanosized NaYF4 Upconversion...

Phase Control of Nanosized NaYF₄ Upconversion Particles

Abstract:

The hexagonal phase NaYF₄ (Na(Y_1.5Na_0.5)F₆, β-NaYF₄ type) is a kind of ideal host materials for upconversion luminescence with high efficiency. The synthesis of monophase hexagonal NaYF₄:Yb³⁺/Er³⁺ nanoparticles has been investigated by solvothermal processing under 200° for 24hrs. It was found that solvents adopted had a great impact on formation of β-NaYF₄. X-ray diffraction patterns indicated that monophase α-NaYF₄ and β-NaYF₄ nanosized grains could be synthesized successfully under environment of ethanol and oleic acid respectively, whereas the mixture of α-NaYF₄ and Na₅Y₉F₃₂ phases were obtained when water was used as solvent. The synthesized pure β-NaYF₄ nanoparticles were uniformly monodispersed in hexagonal shape with typical length of 150~200nm and diameter of 50~100nm. Selected area electron diffraction observation revealed that the as-prepared nanorods are of single crystalline nature. By co-doping (20%)Yb-(2%)Er, the β-NaYF₄ nanosized grains exhibited bright green upconversion luminescence centered at 538nm under the radiation of near-infrared (NIR) laser(nm). The FTIR spectrum shows theβ-NaYF₄ have the potential of water-solubility for the strong bands at around 3444 and 1634 cm^-1.

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Key Engineering Materials (Volumes 512-515)

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235-238

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https://doi.org/10.4028/www.scientific.net/KEM.512-515.235

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Online since:

June 2012

Authors:

Jing Guo, Fei Zhong Ma, Ying Shi, Jian Jun Xie

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NaYF₄:Yb³⁺/Er³⁺, Solvothermal Synthesis, Upconversion Spectroscopy

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