Dynamic Doping in Planar Ionic Transition Metal Complex-Based Light-Emitting Electrochemical Cells

Meier, Sebastian B.University of Erlangen Nurnberg, Germany; Siemens AG, Germany (författare)

Funding Agencies|European Community [FP7-ICT-248043]; Dutch program NanoNextNL
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.

NATURVETENSKAP Fysik Atom- och molekylfysik och optik hsv//swe
NATURAL SCIENCES Physical Sciences Atom and Molecular Physics and Optics hsv//eng
light-emitting electrochemical cells; ionic transition metal complexes; electrochemical doping; dynamic p-n junctions; junction migration

van Reenen, StephanEindhoven University of Technology, Netherlands (författare)
Lefevre, BastienSiemens AG, Germany (författare)
Hartmann, DavidSiemens AG, Germany (författare)
Bolink, Henk J.University of Valencia, Spain (författare)
Winnacker, AlbrechtUniversity of Erlangen Nurnberg, Germany (författare)
Sarfert, WiebkeSiemens AG, Germany (författare)
Kemerink, MartijnEindhoven University of Technology, Netherlands(Swepub:liu)marke89 (författare)
University of Erlangen Nurnberg, Germany; Siemens AG, GermanyEindhoven University of Technology, Netherlands (creator_code:org_t)

Ingår i:Advanced Functional Materials: Wiley-VCH Verlag23:28, s. 3531-35381616-301X1616-3028

Av författaren/redakt...: Meier, Sebastian ...; van Reenen, Step ...; Lefevre, Bastien; Hartmann, David; Bolink, Henk J.; Winnacker, Albre ...; visa fler...; Sarfert, Wiebke; Kemerink, Martij ...; visa färre...

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