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Dynamic doping in planar ionic transition metal complex-based light-emitting electrochemical cells

Using a planar electrode geometry, the operational mechanism of iridium(III) ionic transition metal complex (iTMC)-based light-emitting electrochemical cells (LECs) is studied by a combination of fluorescence microscopy and scanning Kelvin probe microscopy (SKPM). Applying a bias to the LECs leads t...

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Bibliographic Details
Main Authors: Meier, Sebastian B. (Author) , Reenen, Stephan van (Author) , Lefevre, Bastien (Author) , Hartmann, David (Author) , Bolink, Henk J. (Author) , Winnacker, Albrecht (Author) , Sarfert, Wiebke (Author) , Kemerink, Martijn (Author)
Format: Article (Journal)
Language:English
Published: 26 February 2013
In: Advanced functional materials
Year: 2013, Volume: 23, Issue: 28, Pages: 3531-3538
ISSN:1616-3028
DOI:10.1002/adfm.201202689
Online Access:Verlag, Volltext: https://doi.org/10.1002/adfm.201202689
Verlag, Volltext: https://onlinelibrary.wiley.com/doi/abs/10.1002/adfm.201202689
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Author Notes:Sebastian B. Meier, Stephan van Reenen, Bastien Lefevre, David Hartmann, Henk J. Bolink, Albrecht Winnacker, Wiebke Sarfert, and Martijn Kemerink
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Summary:Using a planar electrode geometry, the operational mechanism of iridium(III) ionic transition metal complex (iTMC)-based light-emitting electrochemical cells (LECs) is studied by a combination of fluorescence microscopy and scanning Kelvin probe microscopy (SKPM). Applying a bias to the LECs leads to the quenching of the photoluminescence (PL) in between the electrodes and to a sharp drop of the electrostatic potential in the middle of the device, far away from the contacts. The results shed light on the operational mechanism of iTMC-LECs and demonstrate that these devices work essentially the same as LECs based on conjugated polymers do, i.e., according to an electrochemical doping mechanism. Moreover, with proceeding operation time the potential drop shifts towards the cathode coincident with the onset of light emission. During prolonged operation the emission zone and the potential drop both migrate towards the anode. This event is accompanied by a continuous quenching of the PL in two distinct regions separated by the emission line.
Item Description:Gesehen am 05.12.2019
Physical Description:Online Resource
ISSN:1616-3028
DOI:10.1002/adfm.201202689

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