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利用酸洗改性对共沉淀法制得的油性β-NaYF_4:Yb~(3+),Tb~(3+)@β-NaYF4纳米颗粒进行改性处理,获得水性β-NaYF4:Yb~(3+),Tb~(3+)@β-NaYF4纳米颗粒.表征了制得样品的形貌和上转换荧光特性.结果表明制得的样品分散性好,形貌均一.在相同掺杂浓度和溶液浓度下,水性β-NaYF_4:Yb~(3+),Tb~(3+)@β-NaYF4纳米颗粒溶液的上转换荧光强度比油性β-NaYF4:Yb~(3+),Tb~(3+)@β-NaYF_4和水性β-NaYF4:Yb~(3+),Tb~(3+)纳米颗粒溶液的双光子上转换荧光分别增强了1.1倍和37倍,三光子上转换荧光分别增强了1.5倍和3.9倍.水性β-NaYF4:Yb~(3+),Tb~(3+)@β-NaYF_4纳米颗粒外层存在隔离壳层,导致改性处理既去除了油酸又获得较强的上转换荧光.
The modified β-NaYF_4: Yb ~ (3 +) and Tb ~ (3 +) @ β-NaYF4 nanoparticles prepared by coprecipitation were modified by pickling to obtain aqueous β-NaYF4: Yb3 +), Tb ~ (3 +) @ β-NaYF4 nanoparticles.The morphology and up-conversion fluorescence properties of the prepared samples were characterized.The results show that the prepared samples have good dispersibility and uniform morphology.At the same doping concentration and The upconversion fluorescence intensities of aqueous β-NaYF_4: Yb ~ (3 +) and Tb ~ (3 +) @ β-NaYF4 nanoparticle solutions were higher than that of oily β-NaYF4: Yb3 +, Tb ~ 3-photon upconversion fluorescence of β-NaYF_4 and aqueous β-NaYF4: Yb ~ (3 +) and Tb ~ (3+) nanoparticle solutions were increased by 1.1 and 37 times, respectively. 1.5 times and 3.9 times higher than that of the control.The water-soluble β-NaYF4: Yb ~ (3 +) and Tb ~ (3 +) @ β-NaYF_4 nanoparticle had isolated shell on the outer layer, Strong upconversion fluorescence.