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Conversión supramolecular mediada por el excitador múltiple en ensamblajes orgánicos de lantánidos multicomponentes

Xiao-Fang Duan1,2, Li-Peng Zhou1, Hao-Ran Li1

  • 1State Key Laboratory of Structural Chemistry, CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, P. R. China.

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Resumen

Los investigadores desarrollaron nuevos complejos lantánidos-orgánicos que exhiben propiedades únicas de conversión ascendente (UC). Esta nueva estrategia permite que los materiales de UC sintonizables utilicen estados multiplicadores excitados para mejorar las fotofunciones.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Óptica
  • Química

Sus antecedentes:

  • La conversión ascendente (UC) es un proceso óptico anti-Stokes con amplias aplicaciones.
  • Los mecanismos UC existentes, a menudo basados en la transferencia directa de energía entre iones metálicos, limitan el diseño del material y la capacidad de ajuste.

Objetivo del estudio:

  • Para sintetizar nuevos complejos lantánidos-orgánicos utilizando estados excitados-multimeros inducidos por ensamblaje.
  • Demostrar una nueva estrategia para el diseño de materiales de UC sintonizables.

Principales métodos:

  • Síntesis de dos tipos de complejos lantánidos orgánicos del tipo Ln8L12.
  • Caracterización de la fluorescencia convertida hacia arriba bajo la excitación de 980 nm.
  • Investigación de la sensibilización cooperativa y de los mecanismos de retransmisión de energía mediados por excitadores múltiples.

Principales resultados:

  • El ensamblaje L2R/S12 mostró una fluorescencia verde multimérica convertida a través de la sensibilización cooperativa.
  • Los conjuntos heterometálicos (Yb/Eu) 8L12 lograron una emisión roja convertida hacia arriba a través de un relé de energía mediada por excitador múltiple.

Conclusiones:

  • Los estados excitados-multimeros inducidos por ensamblaje ofrecen una nueva vía para el diseño de materiales UC.
  • Este enfoque mejora la capacidad de diseño y ajuste de los complejos de lantánidos orgánicos multicomponentes para fotofunciones avanzadas.