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Conversión de fotones de infrarrojo cercano a visible sensibilizada por un complejo metálico con absorción S0-T1

Shogo Amemori¹, Yoichi Sasaki¹, Nobuhiro Yanai^1,2

¹Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems, Kyushu University , 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan.

Journal of the American Chemical Society

|June 30, 2016

Resumen

Este estudio introduce un nuevo método de conversión de fotones al infrarrojo cercano (NIR) al visible (UC) utilizando un sensibilizador con absorción directa de S0 a T1, superando la pérdida de energía. El sistema desarrollado logra una emisión de UC eficiente en el aire, ampliando las posibilidades de las aplicaciones de UC NIR-to-vis.

Área de la Ciencia:

Ciencias de los materiales
La fotoquímica
Nanotecnología

Sus antecedentes:

La conversión ascendente de fotones (UC) es crucial para varias aplicaciones, pero la UC basada en la aniquilación de tripletes (TTA) se enfrenta a desafíos debido a la pérdida de energía durante el cruce entre sistemas (ISC).
Los sensibilizadores moleculares tradicionales suelen incurrir en pérdidas de energía durante el proceso S1-T1 ISC, lo que limita la eficiencia NIR-vis UC.

Objetivo del estudio:

Desarrollar un nuevo sistema de conversión de fotones de NIR a vis que evite la pérdida de energía asociada con los sensibilizadores convencionales.
Explorar el uso de un sensibilizador con absorción directa de S0 a T1 en la región NIR para una UC eficiente.

Principales métodos:

Se utilizó una solución mixta de un complejo de osmio con una fuerte absorción de S0-T1 y un emisor de rubreno para el NIR-vis UC.
Las nanopartículas emisoras dopadas con sensibilizantes se prepararon mediante re-precipitación y se incorporaron a una película de polímero de barrera de oxígeno.
Se utilizó la migración de energía triple (TEM) como mecanismo de UC.

Principales resultados:

El sistema convirtió con éxito la luz NIR (938 nm) en luz visible (570 nm) utilizando el complejo de osmio y el emisor de rubrene.
La película compuesta demostró una emisión NIR-UC estable en el aire, atribuida a TEM.
Se logró un alto rendimiento cuántico de UC del 3,1% para el sistema TEM-UC.

Conclusiones:

Este trabajo presenta una estrategia eficaz para superar la pérdida de energía en la UC basada en TTA mediante el uso de un sensibilizador con absorción directa de S0 a T1 NIR.
La película compuesta desarrollada a base de nanopartículas ofrece una emisión NIR-UC estable y eficiente, ampliando la gama de sensibilizadores moleculares aplicables.

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