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 5D0 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)32H2O compound in a polymeric solution and crystalline form.