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Sensibilización de banda ancha de la emisión de lantánidos con puntos cuánticos de fosfuro de indio para el
Joseph K Swabeck1,2, Stefan Fischer1,2, Noah D Bronstein1,2
1Materials Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States.
Journal of the American Chemical Society
|June 21, 2018
Resumen
Los investigadores sintetizaron nuevos nanocristales de fluoruro InP/lantánido (InP/LnxY1−xF3/ShF3). Estos puntos cuánticos ofrecen una amplia absorción y una fuerte emisión en el infrarrojo cercano, superando los desafíos de síntesis anteriores.
Área de la Ciencia:
- Ciencias de los materiales
- Nanotecnología
- La fotoquímica
Sus antecedentes:
- Los puntos cuánticos de semiconductores (QD) sensibilizados con iones lantánidos son prometedores para la emisión de luz sintonizable.
- La síntesis de tales materiales híbridos con una transferencia de energía eficiente ha sido un desafío.
Objetivo del estudio:
- Se informará de la primera síntesis de nanocristales InP/LnxY1−xF3/ShF3.
- Demostrar una amplia absorción visible y una fuerte emisión en el infrarrojo cercano en estas nuevas estructuras.
- Investigar el mecanismo de transferencia de energía entre los iones QD y los lantánidos.
Principales métodos:
- Síntesis de nanocristales InP/LnxY1−xF3/ShF3 de núcleo/capa/capa (Ln = Yb, Nd; Sh = Lu, Y).
- Caracterización mediante microscopía electrónica y técnicas de rayos X.
- Mediciones ópticas, incluida la espectroscopia de absorción y de emisión.
Principales resultados:
- Síntesis exitosa de una estructura de nanocristales de núcleo / cáscara / cáscara única.
- Demostración de una amplia absorción visible junto con una fuerte emisión en el infrarrojo cercano.
- Primer informe de neodimio (Nd) acoplado a un absorbente QD.
- Confirmación de la transferencia de energía de QD a los iones lantánidos, sugerida por la emisión en estado de trampa.
Conclusiones:
- Los nanocristales de fluoruro de InP/lantanuro desarrollados ofrecen una ruta prometedora hacia luminóforos eficientes.
- El estudio proporciona información sobre los mecanismos de transferencia de energía en los sistemas de lantánidos QD.
- Este trabajo abre nuevas vías para el desarrollo de materiales ópticos avanzados.
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