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Issue 2, 2017
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Ce4+/Ce3+ redox-controlled luminescence ‘off/on’ switching of highly oriented Ce(OH)2Cl and Tb-doped Ce(OH)2Cl films

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Abstract

The development of cerium (Ce) hosts and cerium-doped materials is required to meet the growing applications of cerium because cerium containing materials are attractive for many applications such as optical devices, fuel cells, gas sensors, oxygen adsorbents, and selective photocatalysts. In an effort to find new or little-known cerium compounds, Ce(OH)2Cl, a member of the RE(OH)3−xClx (RE = rare earths) family, was successfully synthesized under ambient pressure. Based on the Rietveld structure refinement of the X-ray diffraction pattern, Ce(OH)2Cl crystallizes in the monoclinic space group P21/m with unit cell parameters of a = 6.2898(2) (Å), b = 3.9456(1) (Å), c = 6.8680(2) (Å), and β = 113.54(1)°. The effective 4f → 5d excitation of a Ce3+ ion in this compound caused a strong blue emission, which was attributed to electronic transitions from the 5d1 excited state to the 2F5/2 and 2F7/2 levels of the 4f1 ground state. Furthermore, Tb-doped Ce(OH)2Cl showed a strong green 5D47F5 emission of Tb3+ upon excitation of Ce3+ ions due to the efficient energy transfer from Ce3+ to Tb3+ ions. In particular, the development of a synthetic route at ambient pressure allowed for simple deposition of Ce(OH)2Cl and Tb-doped Ce(OH)2Cl films. The growth direction of the film was significantly dependent on the substrate. The luminescence ‘turn-off/on’ switching was accomplished with highly oriented Ce(OH)2Cl and Tb-doped Ce(OH)2Cl films deposited on FTO glass. Both blue and green emissions could be reversibly quenched and restored by repeated oxidation and reduction in KMnO4 and ascorbic acid solutions, respectively. This Ce4+/Ce3+ redox-controlled luminescence ‘off/on’ switching was operated with a brightness change enough to see visually but without a significant degradation of crystal structure and surface morphology.

Graphical abstract: Ce4+/Ce3+ redox-controlled luminescence ‘off/on’ switching of highly oriented Ce(OH)2Cl and Tb-doped Ce(OH)2Cl films

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Publication details

The article was received on 19 Oct 2016, accepted on 05 Dec 2016 and first published on 05 Dec 2016


Article type: Paper
DOI: 10.1039/C6TC04539A
Citation: J. Mater. Chem. C, 2017,5, 444-451
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    Ce4+/Ce3+ redox-controlled luminescence ‘off/on’ switching of highly oriented Ce(OH)2Cl and Tb-doped Ce(OH)2Cl films

    H. Kim, M. Kim and S. Byeon, J. Mater. Chem. C, 2017, 5, 444
    DOI: 10.1039/C6TC04539A

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