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Dispositivo electroluminiscente con conmutación reversible entre emisiones rojas y verdes
S Welter1, K Brunner, J W Hofstraat
1Molecular Photonics Group, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands.
Nature
|January 4, 2003
Resumen
Los investigadores desarrollaron un nuevo dispositivo de electroluminiscencia orgánica utilizando un polímero semiconductor y un complejo de rutenio. Este material permite la conmutación reversible entre la emisión de luz verde y roja simplemente cambiando el voltaje aplicado.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Electrónica orgánica y electrónica orgánica.
- La fotofísica es la fotofísica.
Sus antecedentes:
- La investigación de la electroluminiscencia orgánica (OEL) prioriza los emisores fosforescentes para una mayor eficiencia y estabilidad.
- El desarrollo de nuevos materiales es crucial para avanzar en el rendimiento de los dispositivos OEL.
Objetivo del estudio:
- Para fabricar un simple dispositivo OEL con emisión de doble color dependiente de voltaje.
- Para investigar un polímero semiconductor combinado con un complejo fosforescente para una salida de luz sintonizable.
Principales métodos:
- Fabricación de un dispositivo OEL utilizando un derivado de polifenilenovileno (PPV) dopado con un complejo dinuclear de rutenio.
- Utilizando el complejo como emisor triple y mediador de transferencia de electrones.
- Aplicando sesgo hacia adelante (+4 V) y hacia atrás (-4 V) para controlar el color de la emisión.
Principales resultados:
- El dispositivo exhibió una conmutación totalmente reversible dependiente de la tensión entre la emisión de luz verde y roja.
- El sesgo hacia adelante dio lugar a una emisión roja del complejo de rutenio.
- El sesgo inverso condujo a la emisión verde del anfitrión del polímero a través de un mecanismo de transferencia de electrones paso a paso.
Conclusiones:
- Se fabricó con éxito un simple dispositivo OEL que demuestra la emisión de doble color a través del control de voltaje.
- El complejo de rutenio dinuclear juega un papel clave en la mediación de la transferencia de electrones y permite la emisión sintonizable.
- Este enfoque ofrece un camino prometedor para el desarrollo de materiales OEL avanzados con salida de luz controlable.
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