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Complejo de lantánidos de cerio (III) con emisión de color rojo intenso más allá de los 700 nm
Jiayin Zheng1, Haodi Niu1, Ruoyao Guo1
1Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing, China.
Nature communications
|August 21, 2025
Resumen
Los investigadores desarrollaron nuevos complejos de cerio (III) emisores de rojo utilizando ligandos de azufre. Estos nuevos materiales ofrecen información sobre emisores de larga longitud de onda y química de coordinación para aplicaciones avanzadas.
Área de la Ciencia:
- Ciencias de los materiales
- Química inorgánica
- La fotoquímica
Sus antecedentes:
- Los compuestos luminiscentes de cerio (III) son cruciales para los fósforos, la fotocatálisis y la electroluminiscencia.
- Los emisores de cerio existentes cubren principalmente las regiones ultravioleta a amarilla debido al nivel de energía 5d.
- Las emisiones de naranja a rojo intenso de los compuestos de cerio (III) siguen estando poco desarrolladas.
Objetivo del estudio:
- Desarrollar nuevos complejos moleculares de cerio (III) con emisión de rojo a rojo intenso.
- Explorar el uso de ligandos de Ditio-biureto de coordinación S para emisores de cerio de larga longitud de onda.
- Investigar la influencia del obstáculo estérico en la estructura compleja y en las propiedades de emisión.
Principales métodos:
- Síntesis de complejos moleculares de cerio (III) utilizando ligandos de ditiobiureto de coordinación S.
- Caracterización de las propiedades de fotoluminiscencia, incluidos los máximos de emisión y la eficiencia cuántica.
- Investigación de los cambios estructurales (mononucleares frente a dinucleares) influenciados por el obstáculo estérico en la solución.
Principales resultados:
- Se logra una emisión de rojo a rojo intenso, con el máximo de emisión más largo a 725 nm.
- Se obtuvo una eficiencia cuántica de fotoluminiscencia del 31% para los complejos desarrollados.
- Se ha demostrado que la sintonización del obstáculo estérico conduce a distintos complejos de cerio (III) mononucleares y dinucleares con variados colores de emisión y comportamientos de interconversión.
Conclusiones:
- Los ligandos de coordinación S muestran un potencial significativo para la creación de emisores de cerio rojo intenso.
- El estudio revela una química de coordinación interesante de los complejos moleculares de cerio.
- Este trabajo amplía el alcance de los emisores de cerio en la desafiante región de longitudes de onda largas.
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