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

Autor(es)

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

• Tipo de documento: Artigo Científico
• Fonte: Journal of Luminescence; v. 247, p. 7-pg., 2022-07-01.

Resumo

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)

• Processo FAPESP: 20/16795-6 - Processos de transferência de energia intramolecular em complexos beta-dicetonatos de terras raras investigados por espectroscopia de absorção transiente
• Beneficiário: Lucca Blois Guimarães
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto