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Realización de la fosforescencia retardada estimulada térmicamente en los complejos de oro arilico y los dispositivos
Man-Chung Tang1, Ming-Yi Leung1, Shiu-Lun Lai1
1Department of Chemistry , The University of Hong Kong , Pokfulam Road , Hong Kong.
Journal of the American Chemical Society
|October 3, 2018
Resumen
Los investigadores desarrollaron un nuevo método para la emisión de luz azul estable utilizando fosforescencia retardada estimulada térmicamente. Este enfoque aumenta la salida de luz y mejora el rendimiento de los dispositivos orgánicos emisores de luz.
Área de la Ciencia:
- Ciencias de los materiales
- Productos electrónicos orgánicos
- La fotofísica
Sus antecedentes:
- Los emisores azules en dispositivos orgánicos emisores de luz (OLED) se enfrentan a desafíos debido a los estados excitados triplet de alto nivel, lo que lleva a la desactivación y la reducción de la eficiencia.
- El desarrollo de emisores fosforescentes azules estables y eficientes es crucial para las tecnologías avanzadas de visualización e iluminación.
Objetivo del estudio:
- Investigar una nueva estrategia para la recolección de emisiones tripletas en materiales fosforescentes azules.
- Para superar la inestabilidad inherente y las vías de desactivación de los emisores azules en los OLED.
Principales métodos:
- Se utiliza el mecanismo de fosforescencia retardada estimulada térmicamente (TSDP, por sus siglas en inglés) para la conversión ascendente de excitones.
- Conversión interna inversa empleada para poblar estados triplet emisores de energía más altos (T1) desde estados más bajos (T1).
- Dispositivos orgánicos emisores de luz (OLED) fabricados y caracterizados que incorporen los emisores azules desarrollados.
Principales resultados:
- Logró una mejora significativa en el rendimiento cuántico de fotoluminiscencia (PLQY) de más de 20 veces.
- Se ha demostrado una emisión azul cielo con coordenadas CIE (0,17, 0,37).
- Realizó OLED con eficiencias cuánticas externas (EQE) de hasta el 7,7% y una estabilidad operativa respetable.
Conclusiones:
- El mecanismo TSDP proporciona una vía eficaz para generar emisiones azules eficientes y estables desde los estados triplet.
- Esta estrategia ofrece una vía prometedora para el diseño de emisores fosforescentes azules de próxima generación para aplicaciones OLED.
- Los materiales y el mecanismo desarrollados contribuyen al avance del campo de la optoelectrónica orgánica.
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