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乙二胺四乙酸辅助相转化法合成（钆稀土）磷酸纳米线（稀土 = 铕、铽）及其光致发光研究

EDTA-assisted phase conversion synthesis of (GdRE)PO nanowires (RE = Eu, Tb) and investigation of photoluminescence.

作者信息

Wang Zhihao, Li Ji-Guang, Zhu Qi, Ai Zhengrong, Li Xiaodong, Sun Xudong, Kim Byung-Nam, Sakka Yoshio

机构信息

Key Laboratory for Anisotropy and Texture of Materials, Northeastern University, Shenyang, China.

Institute for Ceramics and Powder Metallurgy, School of Materials Science and Engineering, Northeastern University, Shenyang, China.

出版信息

Sci Technol Adv Mater. 2017 Jun 28;18(1):447-457. doi: 10.1080/14686996.2017.1338495. eCollection 2017.

DOI:10.1080/14686996.2017.1338495
PMID:28740561
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5507148/
Abstract

Hexagonal (GdRE)PO·HO nanowires ~300 nm in length and ~10 nm in diameter have been converted from (GdRE)(OH)NO·HO nanosheets (RE = Eu, Tb) in the presence of monoammonium phosphate (NHHPO) and ethylene diamine tetraacetic acid (EDTA). They were characterized by X-ray diffraction, thermogravimetry, electron microscopy, and Fourier transform infrared and photoluminescence spectroscopies. It is shown that EDTA played an essential role in the morphology development of the nanowires. The hydrothermal products obtained up to 180 °C are of a pure hexagonal phase, while monoclinic phosphate evolved as an impurity at 200 °C. The nanowires undergo hexagonal→monoclinic phase transformation upon calcination at ≥600 °C to yield a pure monoclinic phase at ~900 °C. The effects of calcination on morphology, excitation/emission, and fluorescence decay kinetics were investigated in detail with (GdEu)PO as example. The abnormally strong D→F electric dipole Eu emission in the hexagonal phosphates was ascribed to site distortion. The process of energy migration was also discussed for the optically active Gd and Eu/Tb ions.

摘要

长度约为300纳米、直径约为10纳米的六方晶系(GdRE)PO₄·H₂O纳米线是在磷酸二氢铵(NH₄H₂PO₄)和乙二胺四乙酸(EDTA)存在的情况下，由(GdRE)(OH)₂NO₃·H₂O纳米片(RE = Eu、Tb)转化而来的。通过X射线衍射、热重分析、电子显微镜以及傅里叶变换红外光谱和光致发光光谱对它们进行了表征。结果表明，EDTA在纳米线的形貌发展过程中起到了至关重要的作用。在高达180°C时获得的水热产物为纯六方相，而在200°C时单斜晶系磷酸盐作为杂质析出。纳米线在≥600°C煅烧时会发生六方相→单斜晶相转变，在约900°C时生成纯单斜晶相。以(GdEu)PO₄为例，详细研究了煅烧对形貌、激发/发射以及荧光衰减动力学的影响。六方晶系磷酸盐中异常强烈的D→F电偶极Eu发射归因于晶格畸变。还讨论了光学活性Gd和Eu/Tb离子的能量迁移过程。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/25a9/5507148/04c503205d3f/tsta_a_1338495_f0012_oc.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/25a9/5507148/4e7c5b855a9e/tsta_a_1338495_uf0001_oc.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/25a9/5507148/6361d9cbc505/tsta_a_1338495_f0001_b.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/25a9/5507148/7bb3536c71f2/tsta_a_1338495_f0002_b.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/25a9/5507148/4b038697b335/tsta_a_1338495_f0003_b.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/25a9/5507148/bd29267a63e9/tsta_a_1338495_f0004_b.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/25a9/5507148/1a0e5846487f/tsta_a_1338495_f0005_oc.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/25a9/5507148/3d3533b2a48b/tsta_a_1338495_f0006_b.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/25a9/5507148/23f4afa09a5d/tsta_a_1338495_f0007_b.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/25a9/5507148/c7308a15ea98/tsta_a_1338495_f0008_b.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/25a9/5507148/bb698fafb373/tsta_a_1338495_f0009_oc.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/25a9/5507148/f1dd8ace9fdc/tsta_a_1338495_f0010_oc.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/25a9/5507148/8e11f2b64708/tsta_a_1338495_f0011_oc.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/25a9/5507148/04c503205d3f/tsta_a_1338495_f0012_oc.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/25a9/5507148/4e7c5b855a9e/tsta_a_1338495_uf0001_oc.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/25a9/5507148/6361d9cbc505/tsta_a_1338495_f0001_b.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/25a9/5507148/7bb3536c71f2/tsta_a_1338495_f0002_b.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/25a9/5507148/4b038697b335/tsta_a_1338495_f0003_b.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/25a9/5507148/bd29267a63e9/tsta_a_1338495_f0004_b.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/25a9/5507148/1a0e5846487f/tsta_a_1338495_f0005_oc.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/25a9/5507148/3d3533b2a48b/tsta_a_1338495_f0006_b.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/25a9/5507148/23f4afa09a5d/tsta_a_1338495_f0007_b.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/25a9/5507148/c7308a15ea98/tsta_a_1338495_f0008_b.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/25a9/5507148/bb698fafb373/tsta_a_1338495_f0009_oc.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/25a9/5507148/f1dd8ace9fdc/tsta_a_1338495_f0010_oc.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/25a9/5507148/8e11f2b64708/tsta_a_1338495_f0011_oc.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/25a9/5507148/04c503205d3f/tsta_a_1338495_f0012_oc.jpg

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