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Nanocrystalline semiconductor LEDs with simple structure and high efficiency

Published online by Cambridge University Press:  15 February 2011

Dietrich Bertram
Affiliation:
Nanomaterials and Devices, Philips Research Laboratories 52066 Aachen, Germany
Volker Weiler
Affiliation:
Nanomaterials and Devices, Philips Research Laboratories 52066 Aachen, Germany
Dimitri Talapin
Affiliation:
Fachbereich Physikalische Chemie, University of Hamburg, 20045 Hamburg, Germany
Horst Weller
Affiliation:
Fachbereich Physikalische Chemie, University of Hamburg, 20045 Hamburg, Germany
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Abstract

Nanocrystalline semiconductor particles exhibit a size dependent bandgap emission, due to size quantisation effects. These particles are derived from solution chemistry and can be made monodisperse under the right synthesis conditions. Compared to organic materials, the inorganic nanoparticles show much higher stability against oxidation and degradation, which makes them an interesting candidate for LEDs and displays. So far, LEDs based on semiconductor nanoparticles typically included low stability organic materials to provide charge injection. The talk will present a new class of nanoparticle LEDs, made without sensitive organic materials. These LEDs show high efficiencies, well defined color throughout the red to green part of the visible spectrum and improved stability under ambient conditions without excessive encapsulation. Using high quality monodisperse suspensions, high color purity is achieved for the emission which paves the road to cheap, high quality displays based on inorganic semiconductor nanoparticles.

Type
Research Article
Copyright
Copyright © Materials Research Society 2003

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