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Ligando-sensibilizado cerca del infrarrojo a la conversión de la luz lineal visible en un complejo de erbio molecular

Bahman Golesorkhi^1,2, Soroush Naseri¹, Laure Guénée³

¹Department of Inorganic and Analytical Chemistry, University of Geneva, 30 quai E. Ansermet, CH-1211 Geneva 4, Switzerland.

Journal of the American Chemical Society

|September 9, 2021

Resumen

Los investigadores han desarrollado un nuevo sistema molecular para la conversión eficiente de la luz. Al integrar una antena de colorante de infrarrojo cercano (NIR) en un complejo de erbio, lograron una emisión visible brillante bajo excitación láser NIR de baja potencia.

Área de la Ciencia:

Ciencias de los materiales
La fotoquímica
Nanotecnología

Sus antecedentes:

Los sistemas de conversión ascendente basados en lantánidos generalmente requieren luz de alta intensidad debido a las secciones transversales de baja absorción.
Las antenas de colorante orgánico en nanopartículas de conversión ascendente han demostrado ser prometedoras para mejorar la recolección y la sensibilización de la luz NIR.

Objetivo del estudio:

Mejorar el brillo de conversión molecular de los complejos de lantánidos para aplicaciones prácticas.
Para superar las limitaciones de los mecanismos de absorción de estado excitado basados en metales de baja eficiencia.

Principales métodos:

Incorporación de una antena de colorante orgánico de infrarrojo cercano (NIR) en el andamio de ligando de un complejo de coordinación de erbio mononuclear.
Excitación del complejo [L6]Er(hfa) 3+ a 801 nm utilizando un láser NIR de baja potencia (0,7 W·cm-2).

Principales resultados:

Logró un aumento significativo en el brillo de la conversión al alza en comparación con los sistemas tradicionales.
Se observa una señal visible medible convertida al alza en una solución diluida (5 × 10-4 M) a temperatura ambiente.
Sensibilización indirecta eficiente demostrada a través de la conversión ascendente de la transferencia de energía, mejorando la emisión visible centrada en Er3+.

Conclusiones:

La integración de las antenas de colorante NIR en sistemas moleculares ofrece una estrategia poderosa para una conversión de la luz hacia arriba eficiente.
Este enfoque supera las limitaciones inherentes de la conversión ascendente de los lantánidos, lo que permite aplicaciones con menor potencia de excitación.
El sistema molecular desarrollado muestra potencial para aplicaciones prácticas más amplias en fotónica y detección.

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