On the dependence of the luminescence intensity of rare-earth compounds with pressure:: a theoretical study of Eu(TTF)32H2O in polymeric solution and crystalline phases

Theoretical models for ligand-rare-earth-ion energy-transfer processes and numerical solutions of the rate equations are used to analyse the dependence of the 4f-4f emission intensity and the D-5(0) excited state lifetime with an applied external pressure, in Eu3+ complexes. Pathways for the intramolecular energy-transfer process between the ligands and the rare-earth ion are proposed. The theoretical results agree well with the experimental data for the Eu(TTF)(3)2H(2)O compound in a polymeric solution and crystalline form. (C) 1999 Elsevier Science B.V. All rights reserved.