Studies on Intermolecular Energy Transfer and Relaxation Processes in Solid Rare Earth Complexes by Photoacoustic Spectroscopy

摘要

The photoacoustic spectra of Eu(benz) 3·(phen) 2 (benz: benzoate, phen: phenanthroline) and Eu 0.8 Ln 0.2 (benz) 3· (phen) 2 (Ln 3+ : La 3+ or Nd 3+ ) were reported. The intermolecular energy transfer processes were studied from the point of the nonradiative transitions. Combined with the fluorescence spectroscopy, photoacoustic spectroscopy reflects the variation of the luminescence efficiencies of solid samples. The luminescence efficiency increases when La 3+ is introduced, but it decreases greatly when Nd 3+ is added, which is due to the difference of intermolecular energy transfer processes. The models of intramolecular and intermolecular energy transfer and relaxation processes were established.