A facile synthesis of CaF₂:Eu²⁺ nanoparticles using citrate-stabilized Au catalysts

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• 作者：Weihao Ye^a ; Qiying Huang^a ; Xiaotang Liu^a ; ^b ; ^{xtliu@scau.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Guangqi Hu^a
• 关键词：Calcium fluoride ; Europium ; Gold nanoparticles ; Catalysis ; Hydrothermal synthesis ; Photoluminescence
• 刊名：Acta Materialia
• 出版年：2017
• 出版时间：1 January 2017
• 年：2017
• 卷：122
• 期：Complete
• 页码：420-430
• 全文大小：3820 K

文摘

Europium doped calcium fluoride (CaF₂:Eu²⁺) nanoparticles have been synthesized by hydrothermal method in which NaBH₄ is added as reductant and citrate-stabilized gold (Cit-Au) nanoparticles are used as catalyst. The microstructure of CaF₂:Eu²⁺ is investigated by X-ray power diffraction (XRD), energy dispersion spectrum (EDS), and selected area electron diffraction (SAED). Field emission scanning electron microscope (FESEM) and transmission electron microscopy (TEM) have shown that the CaF₂:Eu²⁺ nanoparticles are about 60 nm. Lattice fringes observed in high-resolution TEM further displayed high crystallinity of the CaF₂:Eu²⁺ nanoparticles and Cit-Au NPs. An intensive and broad emission peaked at 425 nm due to 4f⁷ – 4f⁶5d¹ transition of Eu²⁺ ions is observed. The 4f⁷(⁸S_7/2) → 4f⁶5d¹(t_2g)optical transitions exhibit a characteristic “staircase’’ spectrum from 330 nm to 380 nm. The effect of gold concentrations on emission of CaF₂:Eu²⁺ has also been investigated.