Dynamic doping in planar ionic transition metal complex-based light-emitting electrochemical cells
| Autor: | D. Hartmann, Wiebke Sarfert, Stephan van Reenen, Henk J. Bolink, Sebastian Meier, Martijn Kemerink, Bastien Lefevre, Albrecht Winnacker |
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| Přispěvatelé: | Molecular Materials and Nanosystems |
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Photoluminescence
Materials science business.industry Drop (liquid) Analytical chemistry Ionic bonding 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Cathode 0104 chemical sciences Electronic Optical and Magnetic Materials Electrochemical cell law.invention Anode Biomaterials law Electrode Electrochemistry Optoelectronics Light emission 0210 nano-technology business |
| Zdroj: | Advanced Functional Materials, 23(28), 3531-3538. Wiley-VCH Verlag |
| ISSN: | 1616-301X |
| DOI: | 10.1002/adfm.201202689 |
| Popis: | 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 miscroscopy 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. |
| Databáze: | OpenAIRE |
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