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白色发光的氟化锶核@氟化钙壳层纳米颗粒中发光的增强

Enhancement of luminescence in white emitting strontium fluoride core @ calcium fluoride shell nanoparticles.

作者信息

Kumam Nandini, Singh Ningthoujam Premananda, Singh Laishram Priyobarta, Srivastava Sri Krishna

机构信息

Department of Chemistry, Manipur University, Imphal, 795003, India.

出版信息

Nanoscale Res Lett. 2015 Dec;10(1):1053. doi: 10.1186/s11671-015-1053-6. Epub 2015 Sep 1.

DOI:10.1186/s11671-015-1053-6
PMID:26323391
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4554543/
Abstract

Synthesis of lanthanide-doped fluoride SrF2:3Dy and SrF2:3Dy@CaF2 nanoparticles with different ratios of core to shell (1:0.5, 1:1 and 1:2) has been carried out by employing ethylene glycol route. X-ray diffraction (XRD) patterns reveal that the structure of the prepared nanoparticles was of cubical shape, which is also evident in TEM images. The size of the nanoparticles for core (SrF2:3Dy) is found to increase when core is covered by shell (CaF2). It is also evident from Fourier transform infrared spectroscopy (FTIR) that ethylene glycol successfully controls the growth and acts as a shape modifier by regulating growth rate. In the photoluminescence investigation, emission spectra of SrF2:3Dy is found to be highly enhanced when SrF2:3Dy is covered by CaF2 due to the decrease of cross relaxation amongst the Dy(3+)-Dy(3+) ions. Such type of enhancement of luminescence in homonanostructure SrF2:3Dy@CaF2 (core@shell) has not been studied so far, to the best of the authors' knowledge. This luminescent material exhibits prominently white light emitting properties as shown by the Commission Internationale d'Eclairage (CIE) chromaticity diagram. The calculated correlate colour temperature (CCT) values for SrF2:3Dy, SrF2:3Dy@CaF2 (1:0.05), SrF2:3Dy@CaF2 (1:1) and SrF2:3Dy@CaF2 (1:2) are 5475, 5476, 5384 and 5525 K, respectively, which lie in the cold white region. Graphical abstract White light emitting homonanostructure material SrF2:3Dy@CaF2(core@shell).

摘要

采用乙二醇路线合成了具有不同核壳比（1:0.5、1:1和1:2）的镧系掺杂氟化物SrF2:3Dy和SrF2:3Dy@CaF2纳米颗粒。X射线衍射（XRD）图谱表明，所制备的纳米颗粒结构为立方体形，这在透射电子显微镜（TEM）图像中也很明显。发现当核（SrF2:3Dy）被壳（CaF2）覆盖时，核纳米颗粒的尺寸会增大。傅里叶变换红外光谱（FTIR）也表明，乙二醇成功地控制了生长，并通过调节生长速率起到了形状修饰剂的作用。在光致发光研究中，由于Dy(3+)-Dy(3+)离子之间的交叉弛豫减少，当SrF2:3Dy被CaF2覆盖时，SrF2:3Dy的发射光谱被发现有显著增强。据作者所知，迄今为止尚未研究过这种同质纳米结构SrF2:3Dy@CaF2（核@壳）中发光的这种增强类型。如国际照明委员会（CIE）色度图所示，这种发光材料具有显著的白光发射特性。SrF2:3Dy、SrF2:3Dy@CaF2（1:0.05）、SrF2:3Dy@CaF2（1:1）和SrF2:3Dy@CaF2（1:2）的计算相关色温（CCT）值分别为5475、5476、5384和5525 K，均位于冷白色区域。图形摘要：白光发射同质纳米结构材料SrF2:3Dy@CaF2（核@壳）

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6cd7/4554543/e97155c6a190/11671_2015_1053_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6cd7/4554543/e9312721edb9/11671_2015_1053_Figa_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6cd7/4554543/e0815decd970/11671_2015_1053_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6cd7/4554543/7f47b87327a8/11671_2015_1053_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6cd7/4554543/f2928c96df8e/11671_2015_1053_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6cd7/4554543/300fae5f05e0/11671_2015_1053_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6cd7/4554543/d3c36d575efd/11671_2015_1053_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6cd7/4554543/c57f27ef5c3f/11671_2015_1053_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6cd7/4554543/e97155c6a190/11671_2015_1053_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6cd7/4554543/e9312721edb9/11671_2015_1053_Figa_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6cd7/4554543/e0815decd970/11671_2015_1053_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6cd7/4554543/7f47b87327a8/11671_2015_1053_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6cd7/4554543/f2928c96df8e/11671_2015_1053_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6cd7/4554543/300fae5f05e0/11671_2015_1053_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6cd7/4554543/d3c36d575efd/11671_2015_1053_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6cd7/4554543/c57f27ef5c3f/11671_2015_1053_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6cd7/4554543/e97155c6a190/11671_2015_1053_Fig7_HTML.jpg

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