J. Phys. IV France 125 (2005) 59-61
Photoacoustic spectroscopy study on lanthanide complexes with aromatic carboxylic acid in silica gelsY.-T. Yang and S.-Y. Zhang
State Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093, PR China
Using a sol-gel process, lanthanide complexes Ln (Sal)3.HO (Ln3+: Nd3+, Tb3+; Sal: salicylic acid) are incorporated into silica gels by the hydrolysis and condensation of tetraethoxysilane (TEOS). After heat treatment at 150 °C for the lanthanide complexes in gels, the photoacoustic (PA) intensity of the ligand changes remarkably, while this difference can not be observed for the samples without heat treatment. Different PA intensities of lanthanide complexes in silica gels can be interpreted by comparison them with their luminescence spectra. The formation of lanthanide complex in silica gel is discussed by two aspects: radiative and nonradiative processes.
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