Abstract
In this work, lanthanide \(\beta \)-diketonate complexes Ln(btfa)\({}_{3} \cdot 2\hbox {H}_{2}\)O (Ln\(^{3+}\): Eu\(^{3+}\), Sm\(^{3+ }\), and Tb\(^{3+}\); btfa: 4,4,4-trifluoro-l-phenyl-1,3-butanedione) were incorporated into silica gels by a sol–gel method. Photoacoustic (PA) spectra of these complex-doped silica samples were measured and studied. The PA intensity of the \(\beta \)-diketonate ligand is nearly the same for lanthanide complexes in wet gels. After heat treatment at 150 \(^{\circ }\)C, however, the PA intensity of the ligand increases for Eu\(^{3+}\), Sm\(^{3+}\), and Tb\(^{3+}\) complexes in silica gels, respectively. Different PA intensities of the samples are interpreted by comparison with their luminescence spectra. The luminescence result is consistent with the PA spectra. The result indicates that lanthanide \(\beta \)-diketonate complexes cannot be formed in silica gels without a suitable heat treatment. Moreover, the relaxation process model is proposed based on the PA and luminescence results.
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This work was supported by the National Basic Research Program of China (2012CB921504) and the National Science Foundation of China (11074127).
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This article is part of the selected papers presented at the 18th International Conference on Photoacoustic and Photothermal Phenomena.
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Liu, R.Y., Zhang, H.X., Yang, Y.T. et al. Study of Lanthanide Complexes with BTFA in Silica Gels by Photoacoustic Spectroscopy. Int J Thermophys 37, 61 (2016). https://doi.org/10.1007/s10765-016-2066-9
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DOI: https://doi.org/10.1007/s10765-016-2066-9