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Enhanced luminescence of delaminated layered europium hydroxide (LEuH) composites with sensitizer anions of coumarin-3-carboxylic acid

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Abstract

The organic compound of coumarin-3-carboxylic acid (CCA), deprotonated beforehand by NaOH, and the 1-octane sulfonic acid anion (OS) were co-intercalated into the gallery of the layered europium hydroxide (LEuH) via an ion exchange method. Different molar ratios of CCA/OS and NaOH/CCA gave rise to the composites of CCA1−xOSx-LEuH (x = 0.8–1.0) showing different emission intensities. In formamide (FM), all composites were delaminated and the formed colloidal suspensions exhibited enhanced red luminescence of Eu3+ in comparison with the OS-LEuH without CCA. Also, the red emissions of the composites were different from the violet emission (421 nm) of free CCA and blue emission (471 nm) of CCA2− anions in different deprotonation states. The energy levels of CCA and Eu3+ were analyzed to explain the sensitization effect for Eu3+ luminescence. The fluorescence lifetimes of CCA0.2OS0.8-LEuH-1 : 1, CCA0.02OS0.98-LEuH-1 : 1, CCA0.2OS0.8-LEuH-1 : 2, and CCA0.02OS0.98-LEuH-1 : 2 were determined to be 0.705, 0.704, 0.699 and 0.638 ms, respectively, indicating significantly longer lifetimes. The PL quantum yields of ∼10% demonstrate the excellent luminescence properties of the as-prepared CCA1−xOSx-LEuH composites. This is the first report on the sensitized luminescence properties of layer Eu3+ ions in LRH composites in the delaminated state. The intriguing red luminescence of delaminated LEuH composites offers a promising approach to achieve efficient luminescent film materials.

Graphical abstract: Enhanced luminescence of delaminated layered europium hydroxide (LEuH) composites with sensitizer anions of coumarin-3-carboxylic acid

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Publication details

The article was received on 21 Jul 2017, accepted on 26 Aug 2017 and first published on 28 Aug 2017


Article type: Paper
DOI: 10.1039/C7DT02662E
Citation: Dalton Trans., 2017, Advance Article
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    Enhanced luminescence of delaminated layered europium hydroxide (LEuH) composites with sensitizer anions of coumarin-3-carboxylic acid

    L. Ma, M. Yuan, C. Liu, L. Xie, F. Su, S. Ma, G. Sun and H. Li, Dalton Trans., 2017, Advance Article , DOI: 10.1039/C7DT02662E

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