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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Phase and luminescent intensity control of hydrophilic rare-earth up-converting nanophosphors prepared by one-pot solvothermal synthesis
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Phase and luminescent intensity control of hydrophilic rare-earth up-converting nanophosphors prepared by one-pot solvothermal synthesis

机译：一锅溶剂热合成制备亲水性稀土上转换纳米磷光体的相和发光强度控制

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摘要

Rare-earth up-converting nano-phosphors (RUNPs) have wide applications, and most of these applications require hydrophilic RUNPs with high up-converting luminescence efficiency. In this work, we report a simultaneous control of the phase and luminescent intensity of hydrophilic Gd~(3+) doped NaYF_4:Yb/Er nanoparticles with diameters of 40-100 nm, which were prepared by a facile one-pot solvothermal synthesis with ethylene glycol as the solvent and polyvinylpyrrolidone) as the ligands at 220 °C for different time. When reaction time is 3 h, the increase of Gd~(3+) dopant concentration from 0 to 30 mol% results in the transformation from cubic to hexagonal phase, and pure hexagonal phase NaYF_4:Yb/Er nanoparticles can be obtained with Gd~(3+) dopant concentration up to 30mol%. Gd~(3+) dopant concentration at 15mol% leads to a maximal luminescent intensity in a wide dopant range of 0-80 mol%. Furthermore, the increase of reaction time from 3 to 24 h favors the formation of hexagonal phase samples and therefore improves greatly luminescence intensity. 15 mol% Gd~(3+) doped NaYF_4 :Yb/Er nanoparticles prepared for 24 h exhibit the highest upconverting luminescence intensity which is almost 11 times as strong as that of ones prepared for 3 h and almost 28 times as strong as that of hexagonal phase NaGdF_4: Yb/Er (namely NaYF_4 :Yb/Er sample with 80 mol% Gd~(3+) prepared for 3 h). Due to its small size, high hydrophilicity and excellent up-converting luminescence, this 15mol% doped NaYF_4:Yb/Er sample has great superiority for biological applications.
机译：稀土上转换纳米磷光体（RUNP）具有广泛的应用，并且这些应用中的大多数都需要具有高上转换发光效率的亲水性RUNP。在这项工作中，我们报告了同时控制直径为40-100 nm的亲水性Gd〜（3+）掺杂的NaYF_4：Yb / Er纳米粒子的相和发光强度的控制，该纳米粒子是通过简便的一锅溶剂热合成法制备的。以乙二醇为溶剂，以聚乙烯基吡咯烷酮为配体，在220°C下进行不同的时间。当反应时间为3 h时，Gd〜（3+）掺杂剂浓度从0 mol％增加到30 mol％导致立方相转变为六方相，Gd〜可以得到纯的六方相NaYF_4：Yb / Er纳米颗粒。 （3+）掺杂剂浓度可达30mol％。 Gd〜（3+）掺杂剂浓度为15mol％时，在0-80 mol％的宽掺杂剂范围内会导致最大发光强度。此外，反应时间从3小时增加到24小时有助于形成六方相样品，因此大大提高了发光强度。制备24 h的15 mol％Gd〜（3+）掺杂NaYF_4：Yb / Er纳米粒子具有最高的上转换发光强度，其强度是3 h制备的11倍，几乎是3倍的28倍。六方相NaGdF_4：Yb / Er（即制备了80 mol％Gd〜（3+）的NaYF_4：Yb / Er样品3小时）。由于其体积小，亲水性高和出色的上转换发光，该15mol％掺杂的NaYF_4：Yb / Er样品在生物学应用中具有极大的优势。

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