Light-emitting electrochemical cells and light-emitting diodes based on ionic conductive poly(phenylene vinylene): a new chemical sensor system |
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| Affiliation: | 1. Institut für Festkörperphysik, Technische Universität Graz, Petersgasse 16, A-8010 Graz, Austria;2. CSIRO Molecular Science, Private Bag 10, Clayton South, Vic. 3169, Australia;1. School of Electronics Engineering, Chungbuk National University, Cheongju 28644, South Korea;2. Nano Convergence Practical Application Center, Daegu Technopark, Daegu 42716, South Korea;1. Institut de Chimie Moléculaire de l’Université de Bourgogne (ICMUB), UMR CNRS 6302, University Bourgogne Franche-Comté, 9 avenue Alain Savary, 21078 Dijon Cedex, France;2. Institut des Sciences Moléculaires (ISM), UMR 5255 CNRS, University of Bordeaux, 351 Cours de la Libération, 33405 Talence Cedex, France;1. Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, PR China;2. Shanxi Research Center of Advanced Materials Science and Technology, Taiyuan 030024, PR China;3. Key Lab of Advanced Transducers and Intelligent Control System of Ministry of Education, College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, PR China;1. DxRay, Inc., Northridge, CA, USA;2. Interon AS, Asker, Norway |
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| Abstract: | Red-orange light-emitting electrochemical cells (LECs) based on poly1,4-(2,5-bis(1,4,7,10-tetraoxaundecyl))phenylene vinylene] also named poly2,5-bis (triethoxy-methoxy)-1,4-phenylene vinylene], (BTEM-PPV) are fabricated and characterized. BTEM-PPV combines good electronic conductivity with ionic conductivity in the oxidized and reduced state due to its conjugated backbone and oligo(ethylene oxide) attached as side chains. When applying this polymer in LECs one obtains devices of moderate brightness and with fast response times. This high performance is achieved without blending an additional ionic conductive polymer into the film. The response time of such devices driven with square waveform voltage pulses was determined to be 480 μs. The turn-on voltage for electroluminescence occurs at 2 V and at 3 V a brightness of about 35 cd/m2 was obtained. Due to the covalent linkage of glyme like side chains to the PPV backbone, BTEM-PPV, complexed with metal ions, shows an ionochromic effect in the absorption spectra and also in the electroluminescence spectra, which can be a new approach to chemical sensors. |
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