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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
Published on: October 1, 2019
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Síntesis fácil de nanocristales estables y altamente luminiscentes de haluro de plomo de metilamonio para
Yasser Hassan1, Olivia J Ashton1, Jong Hyun Park2
1Clarendon Laboratory, Department of Physics , University of Oxford , Parks Road , Oxford OX1 3PU , United Kingdom.
Journal of the American Chemical Society
|January 4, 2019
Resumen
Los investigadores desarrollaron nanocristales estables de triyoduro de plomo de metilamonio altamente luminiscentes para diodos emisores de luz (LED). Este avance mejora las capacidades de emisión de rojo y azul, cruciales para pantallas a todo color y aplicaciones de iluminación avanzadas.
Área de la Ciencia:
- Ciencias de los materiales
- Nanotecnología
- Física del estado sólido
Sus antecedentes:
- Las perovskitas de halogenuros metálicos son prometedoras para los diodos emisores de luz (LED) debido a su color ajustable y alta luminiscencia.
- Los actuales emisores de perovskita roja y azul se retrasan en la eficiencia cuántica externa (EQE) en comparación con el verde y el infrarrojo.
Objetivo del estudio:
- Para sintetizar nanocristales estables y altamente luminiscentes de triioduro de plomo de metilamonio (CH3NH3PbI3).
- Para lograr una emisión sintonizable para los diodos emisores de luz roja y azul (LED).
Principales métodos:
- Técnica de re-precipitación asistida por ligando mediante el uso de disolvente acetonitrilo/metilamina y antisolvente tolueno.
- Relaciones de afinación del ligando, relación del ligando con el tolueno y temperatura del tolueno para la cristalización.
- Mezcla con sal de bromuro para obtener una emisión roja.
Principales resultados:
- "Combinación" para la fabricación de productos de la siguiente manera:
- Se obtiene una emisión sintonizable entre 660-705 nm y una emisión roja a 635 nm.
- LEDs desarrollados a base de perovskita con un EQE electroluminiscente máximo del 2,75%.
Conclusiones:
- Los nanocristales de perovskita estables y altamente emisores se pueden lograr a través de una síntesis controlada.
- Este método avanza en el desarrollo de emisores rojos y azules eficientes para pantallas a todo color y LED blancos.
- Una mayor optimización podría conducir a un mejor rendimiento en los dispositivos emisores de luz basados en perovskita.
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