The role of the Eu(3+7)F1 level in the direct sensitization of the D-5(0) emitting level through intramolecular energy transfer

Author(s)

Blois, Lucca ; Neto, Albano N. Carneiro ; Malta, Oscar L. ; Brito, Hermi F.

• Document type: Journal article
• Source: Journal of Luminescence; v. 247, p. 7-pg., 2022-07-01.

Abstract

The understanding of intramolecular energy transfer (IET) processes in photoluminescent Eu3+ chelates is of great importance in the design of new efficient emitting devices, sensors, optical thermometers, etc. Even though the theoretical models have been established, some considerations on the participation of the thermally populated excited state (7)F1 are necessary for experiments at room temperature. This work presents theoretical simulations of the transients related to the ligand and lanthanide excited states by employing two IET processes models, with and without the consideration of the (7)F1 thermal population at 298 K for the [Eu(tta)(3)(H2O)(2)] compound. The transients were obtained from a numerical method of the differential rate equations for each excited state, simulating a high-power density as in transient experiments. It is shown that all transients are considerably affected by the introduction of the (7)F1 state and the predicted curves, especially for the ligand S-1 state, can be experimentally measured. Therefore, the proposed model suggests that when considering energy transfer processes involving ligand and Eu3+ states, the thermal population of the (7)F1 state should be taken into account at room temperature. (AU)

• FAPESP's process: 20/16795-6 - Intramolecular energy transfer processes in rare-earth beta-diketonate complexes investigated by means of transient absorption spectroscopy
• Grantee: Lucca Blois Guimarães
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)