Fluorescence enhancement by chelation of Eu³⁺ and Tb³⁺ ions in sol–gels

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• 作者：Magyar ; A.P. ; Silversmith ; A.J. ; Brewer ; K.S. ; Boye ; D.M.
• 关键词：Europium ; Terbium ; Europium ; Terbium ; Chelation ; Sol&ndash ; gel ; Glass
• 刊名：Journal of Luminescence
• 出版年：2004
• 出版时间：June, 2004
• 年：2004
• 卷：108
• 期：1-4
• 页码：49-53
• 全文大小：245 K

文摘

Chelation of rare-earth (RE) ions is investigated as a means of enhancing the optical properties of RE-doped silica sol–gels. Two chelating agents—2,6-pyridine-dicarboxylic acid (PDC) and 3-pyridinepropionic acid (PPA) and two different synthesis techniques are studied. Eu(PDC) gels exhibit intense ⁵D₀→⁷F₂ fluorescence in the red under UV excitation and long fluorescence lifetimes compared to Eu(PPA) gels and to gels without a chelating agent. This behavior indicates that the PDC molecule remains associated with the Eu after incorporation into the gel. Similar behavior is seen for ⁵D₄→⁷F₅ green fluorescence in Tb(PDC).