Challenging Conventional Wisdom: Finding High-Performance Electrodes for Light-Emitting Electrochemical Cells
| Autor: | Ludvig Edman, E. Mattias Lindh, Jin Xu, Shi Tang, Wei Yang, Andreas Sandström |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
business.industry 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Cathode 0104 chemical sciences Electrochemical cell law.invention Anode Indium tin oxide law Electrode Optoelectronics General Materials Science Light-emitting electrochemical cell 0210 nano-technology business Common emitter |
| Zdroj: | ACS applied materialsinterfaces. 10(39) |
| ISSN: | 1944-8252 |
| Popis: | The light-emitting electrochemical cell (LEC) exhibits capacity for efficient charge injection from two air-stable electrodes into a single-layer active material, which is commonly interpreted as implying that the LEC operation is independent of the electrode selection. Here, we demonstrate that this is far from the truth and that the electrode selection instead has a strong influence on the LEC performance. We systematically investigate 13 different materials for the positive anode and negative cathode in a common LEC configuration with the conjugated polymer Super Yellow as the electroactive emitter and find that Ca, Mn, Ag, Al, Cu, indium tin oxide (ITO), and Au function as the LEC cathode, whereas ITO and Ni can operate as the LEC anode. Importantly, we demonstrate that the electrochemical stability of the electrode is paramount and that particularly electrochemical oxidation of the anode can prohibit the functional LEC operation. We finally report that it appears preferable to design the device so that the heights of the injection barriers at the two electrode/active material interfaces are balanced in order to mitigate electrode-induced quenching of the light emission. As such, this study has expanded the set of air-stable electrode materials available for functional LEC operation and also established a procedure for the evaluation and design of future efficient electrode materials. |
| Databáze: | OpenAIRE |
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