Syntheses of Eu-Activated Alkaline Earth Fluoride MF2 ($\text{M}=\text{Ca}$, Sr) Nanoparticles

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概要

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• The Eu2+ ion-activated CaF2 and SrF2 nanoparticles were prepared by the sol–gel technique assisted with the trifluoro-acetic acid (TFA), and were evaluated by X-ray diffraction (XRD), photoluminescence (PL), photoluminescence excitation (PLE) measurements and atomic force microscopy (AFM) observation. A modified reducing method based on the thermal-carbon reducing atmosphere (TCRA) treatment using activated carbon was proposed to realize the effective reduction from Eu3+ to Eu2+ ions, in which the nanoparticles showed a strong and broad luminescence due to the parity allowed 4f7–4f65d1 transition. From the XRD results, it was found that the average particle size proportionally increased in the range of 15 to 120 nm and 10 to 100 nm for CaF2 and SrF2, respectively, with increasing sintering temperatures 300–700 °C. The surface images of nanoparticles obtained by the AFM revealed that the grains with high uniformity grew with increasing TCRA temperatures. It was confirmed that the reduced Eu2+ ions were homogeneously dispersed with the critical distance 16–17 Å in the fluoride nanoparticles from the concentration quenching results.

• Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
• 2007-09-30

著者

• Hong Byung-chul

  Department Of Electronic Engineering The University Of Electro-communications

• Kawano Katsuyasu

  Department Of Applied Physics Osaka City University:absence Of The University Of Electro-communicati

• Hong Byung-Chul

  Department of Electronic Engineering, The University of Electro-Communications, Chofu, Tokyo 182-8585, Japan

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