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水热法合成的HfO:Er、Yb纳米颗粒的上转换发射

Up-Conversion Emissions from HfO: Er, Yb Nanoparticles Synthesized by the Hydrothermal Method.

作者信息

Méndez-Castillo Marlen Deyanira, García-Hipólito Manuel, Zamora-Peredo Luis, Sumoza-Toledo Adriana, Izaguirre-Hernández Irma Yadira, Casañas Pimentel Rocio Guadalupe, Martínez-Castillo Jaime, García-González Leandro, Hernández Torres Julián, Báez-Rodríguez Adriana, Falcony Ciro

机构信息

Centro de Investigación en Micro y Nanotecnología, Universidad Veracruzana, Calzada Adolfo Ruiz Cortines 455, Fraccionamiento Costa Verde, Boca del Río, Veracruz 94292, Mexico.

Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, Coyoacán, CDMX 04510, Mexico.

出版信息

ACS Omega. 2024 Aug 28;9(36):37560-37571. doi: 10.1021/acsomega.4c00808. eCollection 2024 Sep 10.

DOI:10.1021/acsomega.4c00808
PMID:39281934
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11391450/
Abstract

Up-conversion emission from HfO nanoparticles, as a host lattice, doped with Er and Yb ions and codoped with alkaline cations Li and Na obtained. The HfO nanoparticles, about 80 nm in diameter, were synthesized by the hydrothermal method at 200 °C for 1.3 h, and an additional heat treatment at 1000 °C was necessary to ensure the dopants incorporation into the host lattice. These nanoparticles were studied by means of XRD, Raman Spectroscopy, SEM, EDS, PL, CL, and up-conversion luminescence. First, the doping was performed with Er ions in different percentages. The photoluminescence and cathodoluminescence studies showed an inefficient emission, and only at 7 at % Er ions, the sample presented emissions at 522, 545, and 656 nm corresponding to the transitions of the Er ions. So, codoping was carried out, and HfO: Er/Yb generated an efficient conversion process. The atom percentage of Yb ions was fixed (7 at % Yb), and the Er content was varied, showing the highest emission intensity at 3 at % Er ions. Subsequently, the up-conversion emission intensity was optimized by varying the percentage of Yb ions and keeping the Er ion content fixed (3 at %). Adding cations such as Na and Li in different percentages, a notable improvement of the up-conversion emission intensities in the HfO: Er/Yb nanoparticles was obtained. The up-conversion emission bands observed were located at ∼523 and 544 nm, corresponding to the electronic transitions H → I and S → I, respectively. While the bands at ∼652 and 673 nm correspond to the transition F → I, respectively. The excitation of these materials with infrared radiation (980 nm) produced noticeable emission bands in the red spectral range, whereas excitation with accelerated electrons (CL) generated prominent bands in the green region.

摘要

获得了以HfO纳米颗粒为基质晶格、掺杂有Er和Yb离子并共掺杂有碱性阳离子Li和Na的上转换发射。直径约80 nm的HfO纳米颗粒通过水热法在200℃下合成1.3 h，并且需要在1000℃下进行额外的热处理以确保掺杂剂掺入基质晶格中。通过X射线衍射（XRD）、拉曼光谱、扫描电子显微镜（SEM）、能谱分析（EDS）、光致发光（PL）、阴极发光（CL）和上转换发光对这些纳米颗粒进行了研究。首先，以不同百分比的Er离子进行掺杂。光致发光和阴极发光研究表明发射效率低下，仅在7 at%的Er离子时，样品在522、545和656 nm处出现发射，对应于Er离子的跃迁。因此，进行了共掺杂，HfO:Er/Yb产生了高效的转换过程。Yb离子的原子百分比固定（7 at% Yb），改变Er含量，在3 at% Er离子时显示出最高的发射强度。随后，通过改变Yb离子的百分比并保持Er离子含量固定（3 at%）来优化上转换发射强度。以不同百分比添加Na和Li等阳离子，在HfO:Er/Yb纳米颗粒中获得了上转换发射强度的显著提高。观察到的上转换发射带分别位于约523和544 nm处，对应于电子跃迁H→I和S→I。而在约652和673 nm处的带分别对应于跃迁F→I。用红外辐射（980 nm）激发这些材料在红色光谱范围内产生明显的发射带，而用加速电子激发（CL）在绿色区域产生突出的带。

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