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Un aumento de la luminiscencia de antipolaridad en Dy/Eu@Gd-MOFs inducidos por disolventes isoméricos
Xiaoxuan Fan1, Yonggui Zheng1, Jiayi Yan2
1College of Physics, Liaoning University, Shenyang 110036, China.
The journal of physical chemistry. B
|February 9, 2026
Resumen
Los solventes altamente polares suelen apagar la luminiscencia de las tierras raras. Sin embargo, los Dy/Eu@Gd-MOF mostraron una luminiscencia mejorada en más disolventes polares, revelando un nuevo mecanismo de transferencia de energía.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- La fotoquímica es la fotoquímica.
- Nanotecnología La nanotecnología es la nanotecnología.
Sus antecedentes:
- Los materiales de luminiscencia dopados de tierras raras son sensibles a la polaridad del disolvente, a menudo exhiben apagado de la luminiscencia en disolventes polares.
- La comprensión de las interacciones solvente-solute es crucial para optimizar las propiedades de luminiscencia en materiales como las estructuras metal-orgánicas (MOF).
Objetivo del estudio:
- Investigar el comportamiento contraintuitivo de la fotoluminiscencia (PL) de los MOFs basados en gadolinio (Dy/Eu@Gd-MOFs) dopados con disprosio/europio en varios isómeros de alcohol.
- Para dilucidar el mecanismo subyacente responsable de la correlación inversa observada entre la polaridad del disolvente y la intensidad de la luminiscencia.
Principales métodos:
- Síntesis de las Dy/Eu@Gd-MOFs.
- Espectroscopia de fotoluminiscencia (en estado estacionario y con resolución de tiempo) a diferentes temperaturas.
- Análisis de las interacciones solvente-solute utilizando espectroscopia vibratoria de isómeros de alcohol.
Principales resultados:
- Los Dy/Eu@Gd-MOF mostraron una mayor intensidad de luminiscencia con el aumento de la polaridad del disolvente (isómeros de propanol/butanol).
- El fenómeno observado no se debió únicamente a la reabsorción, los efectos generales del disolvente o las vibraciones de alta frecuencia.
- Los modos vibratorios de los isómeros de alcohol que resuenan con la brecha de energía del sensibilizador facilitaron la desintegración no radiativa, canalizando la energía al activador.
Conclusiones:
- Se identificó un nuevo mecanismo de transferencia de energía mediada por disolventes, donde las vibraciones específicas del disolvente mejoran la luminiscencia en los MOF de tierras raras.
- Este trabajo desafía la comprensión convencional del apagado de la luminiscencia inducida por solventes y ofrece una nueva estrategia para modular los estados excitados a través de la ingeniería de solventes.
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