DataVXACS Applied Materials & InterfacesPaper
journal article·2016-09-21Open access

Quantum Dot/Light-Emitting Electrochemical Cell Hybrid Device and Mechanism of Its Operation

Julia Frohleiks, Svenja Wepfer, Yusuf Kelestemur, Hilmi Volkan Demir, Gerd Bacher, Ekaterina Nannen

ACS Applied Materials & Interfaces· Volume 8· Issue 37
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Source abstract

Abstract

A new type of light-emitting hybrid device based on colloidal quantum dots (QDs) and an ionic transition metal complex (iTMC) light-emitting electrochemical cell (LEC) is introduced. The developed hybrid devices show light emission from both active layers, which are combined in a stacked geometry. Time-resolved photoluminescence experiments indicate that the emission is controlled by direct charge injection into both the iTMC and the QD layer. The turn-on time (time to reach 1 cd/m(2)) at constant voltage operation is significantly reduced from 8 min in the case of the reference LEC down to subsecond in the case of the hybrid device. Furthermore, luminance and efficiency of the hybrid device are enhanced compared to reference LEC directly after device turn-on by a factor of 400 and 650, respectively. We attribute these improvements to an increased electron injection efficiency into the iTMC directly after device turn-on.
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Research context

OpenAlex topics: Quantum Dots Synthesis And Properties · Organic Light-Emitting Diodes Research · Perovskite Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Research Group “Solid State Lighting”, NanoEnergieTechnikZentrum, University Duisburg-Essen, 47057 Duisburg, Germany

Werkstoffe der Elektrotechnik and CENIDE, University Duisburg-Essen, 47057 Duisburg, Germany

Department of Electrical and Electronics Engineering, Department of Physics, UNAM−Institute of Materials Science and Nanotechnology, Bilkent University, Ankara 06800, Turkey

Luminous! Center of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, School of Physical and Materials Sciences, School of Materials Science and Nanotechnology, Nanyang Technological University, Singapore 639798, Singapore

Funding

European Science Foundation · National Research Foundation Singapore · Cordis · Türkiye Bilimsel ve Teknolojik Arastirma Kurumu · Universität Duisburg-Essen · Türkiye Bilimler Akademisi · Science and Engineering Research Council · OSRAM GmbH

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