Eu³⁺-modification of luminescent hybrid bimodal mesoporous silicas with various anions (NO₃^{鈭?/sup>, CH₃COO鈭?/sup>, and Cl鈭?/sup>)}

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• 作者：Feng Wang ; Jihong Sun ; ^{jhsun@bjut.edu.cn" class="auth_mail} ; Jinpeng Wang ; Shiyang Bai ; Xia Wu
• 关键词：Mesoporous materials ; Chemical synthesis ; Chemical techniques ; Luminescence
• 刊名：Materials Chemistry and Physics
• 出版年：16 June, 2014
• 年：2014
• 卷：145
• 期：3
• 页码：471-475
• 全文大小：806 K

文摘

In order to enhance the intensity of luminescent hybrid bimodal mesoporous silica (LHMS), the rare earth Eu³⁺ ion was employed as an enhancer to modify 1,8-naphthalic anhydride (NA) molecules. The modified LHMS were prepared with various anions of europium salts including Cl^{鈭?/sup>, NO₃鈭?/sup>, and CH₃COO鈭?/sup>. The structure and photoluminescence properties of the obtained samples were characterized by XRD, TEM, N₂-adsorption/desorption, FT-IR, TGA, ICP-OES, and PL measurements. The results showed that the bimodal mesoporous system of BMMs could be preserved after functionalization via grafted Eu3+-modified NA molecules onto mesoporous matrix. However, the structure parameters and textural properties of resultant LHMS series were obviously influenced by the anions volume. Meanwhile, the luminescent performances of LHMS series were seriously impacted by both of the binding force between Eu3+ and various anions and steric hindrance of the anions, resulting in the intensity of emission peak of obtained LHMS series declining as following order: LHMS-EN (NO₃鈭?/sup>)聽>聽LHMS-EA (CH₃COO鈭?/sup>)聽>聽LHMS-EC (Cl鈭?/sup>). Finally, the related mechanism was discussed in-depth.}