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Title: Preparation of KMgF{sub 3} and Eu-doped KMgF{sub 3} nanocrystals in water-in-oil microemulsions

Abstract

In this study, KMgF{sub 3}:Eu{sup 2+} luminescent nanocrystals (NCs) were prepared in water/cetyltrimethylammonium bromide (CTAB)/2-octanol microemulsions. The KMgF{sub 3}:Eu{sup 2+} NCs were characterized by transmission electron microscopy (TEM), X-ray diffractometer (XRD), fluorescence spectrum, infrared spectroscopy (IR) and elementary analysis. The results showed that the size of the KMgF{sub 3}:Eu{sup 2+} NCs was hardly affected by water content and surfactant (CTAB) concentration. The emission spectrum showed that the position of the 362 nm peak is due to the K{sup +} sites substituted Eu{sup 2+}. Two emission peaks located at 589 and 612 nm can be attributed to Eu{sup 3+}, which exist at two different types of Eu{sup 3+} centers: one is Eu{sup 3+} at a K{sup +} site, the other is clustering of Eu{sup 3+} ions in the interstices of KMgF{sub 3} host lattice.

Authors:
 [1];  [2];  [3]
  1. College of Life Science, Dalian Nationalities University, Dalian 116600 (China). E-mail: rnhua@dlnu.edu.cn
  2. Department of Geosciences, Material Sciences Center, Philipps University, Hans-Meerwein-Strasse, D-35032 Marburg (Germany)
  3. Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 (China)
Publication Date:
OSTI Identifier:
21000587
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 42; Journal Issue: 2; Other Information: DOI: 10.1016/j.materresbull.2006.06.004; PII: S0025-5408(06)00244-3; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION SPECTROSCOPY; BROMIDES; CHEMICAL PREPARATION; DOPED MATERIALS; EMISSION SPECTRA; EUROPIUM IONS; FLUORESCENCE SPECTROSCOPY; INFRARED SPECTRA; LUMINESCENCE; MAGNESIUM FLUORIDES; MICROEMULSIONS; NANOSTRUCTURES; POTASSIUM FLUORIDES; POTASSIUM IONS; SURFACTANTS; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION; X-RAY DIFFRACTOMETERS

Citation Formats

Hua Ruinian, Jia Zhihong, and Shi Chunshan. Preparation of KMgF{sub 3} and Eu-doped KMgF{sub 3} nanocrystals in water-in-oil microemulsions. United States: N. p., 2007. Web.
Hua Ruinian, Jia Zhihong, & Shi Chunshan. Preparation of KMgF{sub 3} and Eu-doped KMgF{sub 3} nanocrystals in water-in-oil microemulsions. United States.
Hua Ruinian, Jia Zhihong, and Shi Chunshan. Thu . "Preparation of KMgF{sub 3} and Eu-doped KMgF{sub 3} nanocrystals in water-in-oil microemulsions". United States. doi:.
@article{osti_21000587,
title = {Preparation of KMgF{sub 3} and Eu-doped KMgF{sub 3} nanocrystals in water-in-oil microemulsions},
author = {Hua Ruinian and Jia Zhihong and Shi Chunshan},
abstractNote = {In this study, KMgF{sub 3}:Eu{sup 2+} luminescent nanocrystals (NCs) were prepared in water/cetyltrimethylammonium bromide (CTAB)/2-octanol microemulsions. The KMgF{sub 3}:Eu{sup 2+} NCs were characterized by transmission electron microscopy (TEM), X-ray diffractometer (XRD), fluorescence spectrum, infrared spectroscopy (IR) and elementary analysis. The results showed that the size of the KMgF{sub 3}:Eu{sup 2+} NCs was hardly affected by water content and surfactant (CTAB) concentration. The emission spectrum showed that the position of the 362 nm peak is due to the K{sup +} sites substituted Eu{sup 2+}. Two emission peaks located at 589 and 612 nm can be attributed to Eu{sup 3+}, which exist at two different types of Eu{sup 3+} centers: one is Eu{sup 3+} at a K{sup +} site, the other is clustering of Eu{sup 3+} ions in the interstices of KMgF{sub 3} host lattice.},
doi = {},
journal = {Materials Research Bulletin},
number = 2,
volume = 42,
place = {United States},
year = {Thu Feb 15 00:00:00 EST 2007},
month = {Thu Feb 15 00:00:00 EST 2007}
}
  • Highlights: {yields} The samples were synthesized by a hydrothermal method. {yields} Eu{sup 3+} displays different optical properties in the samples. {yields} The optical properties are compared studied and analyzed. {yields} J-O parameters are calculated based on Eu{sup 3+} emission spectra in some samples. {yields} J-O theory analysis is consistent well with the experimental results. -- Abstract: 5 mol% Eu{sup 3+} doped NaYF{sub 4} ({alpha}-, {beta}-), YF{sub 3}, YF{sub 3}.1.5NH{sub 3}, NaGdF{sub 4}, and LaF{sub 3} micro/nanocrystals have been synthesized by a hydrothermal method. The final products are characterized by X-ray diffraction, field emission scanning electron microscopy, photoluminescence excitation and emissionmore » spectra, and luminescent dynamic decay curves. Due to its sensitivity to local symmetry, Eu{sup 3+} shows different optical properties in the above samples. It has stronger luminescent intensity in {beta}-NaYF{sub 4} than that in {alpha}-NaYF{sub 4} while it exhibits different higher energy {sup 5}D{sub 1,2} to lower {sup 7}F{sub J} emissions as well as the asymmetric ratios and the splits of {sup 5}D{sub 0} {yields} {sup 7}F{sub 1}, {sup 7}F{sub 4}. YF{sub 3}, LaF{sub 3}, and {beta}-NaGdF{sub 4} have analogous optical intensities to those of {beta}-NaYF{sub 4}. However, {beta}-NaGdF{sub 4} has the similar spectral profile to that of {beta}-NaYF{sub 4} while YF{sub 3} and LaF{sub 3} have the opposite cases in the {sup 5}D{sub 0} {yields} {sup 7}F{sub 2}, {sup 7}F{sub 1} emissions. Further, Judd-Ofelt calculation has been used to analyze the experimental phenomena.« less
  • Uniform shuttle-like Ln{sup 3+} (Eu{sup 3+}, Tb{sup 3+}) doped NaLa(WO{sub 4}){sub 2} nanocrystals have been solvothermally synthesized, and the size of the nanocrystals could be easily controlled by adjusting the volume ratio of ethylene glycol (EG) to water. Doped with 5 mol% Eu{sup 3+} and Tb{sup 3+} ions, the NaLa(WO{sub 4}){sub 2} nanocrystals showed strong red and green emissions with lifetimes of 0.8 and 1.40 ms, respectively. A high quenching concentration of 15 mol% was observed in Eu{sup 3+}-doped NaLa(WO{sub 4}){sub 2} nanocrystals and 35 mol% in Tb{sup 3+}-doped NaLa(WO{sub 4}){sub 2} nanocrystals. The emission intensity measurements of Eu{sup 3+}-dopedmore » NaLa(WO{sub 4}){sub 2} with different sizes indicated that the emission intensity of shuttles with length of 300 nm in average was stronger than that of shuttles with length of 900 nm in average, but was weaker than that of needles with length of 4 and 9 {mu}m in average. - Graphical abstract: Uniform shuttle-like Ln{sup 3+}(Eu{sup 3+}, Tb{sup 3+}) doped NaLa(WO{sub 4}){sub 2} nanocrystals have been solvothermally synthesized in the mixed solvent of ethylene glycol (EG) and water at 180 deg. C for 16 h.« less
  • Fine powders of Y{sub 2}Sn{sub 2}O{sub 7} nanocrystals with pyrochlore structure have been successfully synthesized by the hydrothermal method in an alkaline system. The samples were characterized by X-ray diffraction, Fourier transform infrared and Raman spectroscopy. Furthermore, photoluminescence characterization of the Y{sub 2}Sn{sub 2}O{sub 7} nanocrystals doped with 5 mol% Eu{sup 3+} was carried out, and the results show that there were some intense and prevailing emission peaks located at 580-635 nm.
  • The perovskite-like KMgF{sub 3} polycrystalline compounds were synthesized by standard solid state reaction technique. Phase purity of the synthesized compounds was analyzed by powder X-ray diffraction technique. Single crystals of (0.2 mol% of EuF{sub 3} and CeF{sub 3}) Co-doped KMgF{sub 3} have been grown from melt by using a vertical Bridgman-Stockbarger method. Thermoluminescence (TL) characteristics of KMgF{sub 3} samples doped with Eu{sub 2+} and Ce{sub 3+} have been studied after β-ray irradiation. At ambient conditions the photoluminescence spectra consisted of sharp line peaked of Eu{sub 2+} at 360 nm attributed to the f → f transition ({sup 6}P{sub 7/2}→{sup 8}S{submore » 7/2}) could only be observed due to the energy transfer from Ce{sub 3+} to Eu{sub 2+}.« less
  • Nanoscale Lu{sub 2}O{sub 3}:Eu powders were prepared by solution combustion synthesis. X-ray diffraction (XRD), high-resolution electronic microscope (HREM), Fourier transform infrared spectroscopy (FT-IR), excitation and emission spectra, as well as fluorescent decay curves were measured to characterize the structure and luminescent properties of the samples. The results show that the compound of composition Lu{sub 2}O{sub 3} crystallizes in pure cubic structure. By changing the ratio of glycine to nitrate in the combustion process, the particle size varies from 40nm to less than 5nm. The emission and excitation spectra strongly depend on the particle size of the samples. Novel emission band,more » red-shift of charge transfer band (CTB) and shortening of lifetime were observed in nanoscale samples.« less