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Challenges and solutions for high-efficiency quantum dot-based LEDs

Published online by Cambridge University Press:  12 September 2013

Deniz Bozyigit  and
Vanessa Wood
Deniz Bozyigit
Affiliation:
ETH Zürich, Switzerland;[email protected]
Vanessa Wood
Affiliation:
ETH Zürich, Switzerland;[email protected]
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Abstract

Colloidal quantum dots (QDs) hold great promise as electrically excited emitters in light-emitting diodes (LEDs) for solid-state lighting and display applications, as highlighted recently by the demonstration of a red-emitting QD-LED with efficiency on par with that of commercialized organic LED technologies. In the past five years, important advances have been made in the synthesis of QD materials, the understanding of QD physics, and the integration of QDs into solid-state devices. Insights from this progress can be leveraged to develop a set of guidelines to direct QD-LED innovation. This article reviews the fundamental causes of inefficiency in QD-LEDs understood to date and proposes potential solutions. In particular, we emphasize the challenge in developing QD emitters that exhibit high luminescent quantum yields in the combined presence of charge carriers and electric fields that appear during traditional LED operation. To address this challenge, we suggest possible QD chemistries and active layer designs as well as novel device architectures and modes of QD-LED operation. These recommendations serve as examples of the type of innovations needed to drive development and commercialization of high-performance QD-LEDs.

Keywords

Luminescencenanostructureoptoelectronic
Type
Quantum dot light-emitting devices
Information
MRS Bulletin , Volume 38 , Issue 9: Quantum dot light-emitting devices , September 2013 , pp. 731 - 736
Copyright
Copyright © Materials Research Society 2013 

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