Intrinsic electrochemical doping in blue light emitting polymer devices utilizing a water soluble anionic conjugated polymer |
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| Affiliation: | 1. Christian Doppler Laboratory Advanced Functional Materials, Institute of Solid State Physics, Graz University of Technology, A-8010 Graz, Austria;2. JOANNEUM RESEARCH Institute of Nanostructured Materials and Photonics, A-8160 Weiz, Austria;3. Bergische Universität Wuppertal, Makromolekulare Chemie, Fachbereich Chemie Gaußstraße 20, D-42119 Wuppertal, Germany;1. WCU Program Department of Energy Engineering, Hanyang University, Seoul 133-791, Republic of Korea;2. School of Chemical Engineering and Materials Science, Chung-Ang University, Seoul 156-756, Republic of Korea;3. Department of Chemistry, Sangmyung University, Seoul 110-743, Republic of Korea;1. School of Materials Science and Engineering, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China;2. State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, 457 Zhongshan Road, Dalian 116023, China;1. Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China;2. University of Chinese Academy of Sciences, Beijing 100049, PR China;1. Department of Applied Physics, School of Physics and Electronics, Hunan University, Changsha 410082, China;2. Synergetic Innovation Center for Quantum Effects and Applications of Hunan, Changsha 410081, China;1. DITEN, COSMIC Lab, University of Genova, Genova, Italy;2. MECRL Lab, Lebanese University, Beirut, Lebanon;3. iCub Facility, Istituto Italiano di Tecnologia, Genova, Italy |
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| Abstract: | We report on light emitting device related properties of the water soluble blue light emitting anionic poly{1,4-phenylene-9,9-bis(4-phenoxy-butylsulfonate)]fluorene-2,7-diyl} copolymer (PBS-PFP) with alkyl sulfonic acid sodium side chains. Compared to organic solvents water has the advantage of being environmentally friendly, which simplifies the handling during device fabrication by novel preparation techniques such as ink-jet printing. Light emitting devices fabricated from this polymer in thin film configuration show stable blue emission with an emission maximum at approximately 420 nm. Investigations concerning the current–density/voltage and the luminance/voltage device characteristics as well as the current–density over operation time at constant biases allow the identification of intrinsic electrochemical doping effects caused by ionic groups attached on the side chains of the polymer. Due to this fact, firstly the electroluminescence onset voltage for devices using high work-function electrodes for electron injection such as aluminum, which has the advantage of being air stable, can be distinctly reduced, and secondly devices fabricated from this polymer showed luminance in forward bias direction as well as in reverse bias direction. |
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