Ion beam assisted deposition of organic molecules: a physical way to realize OLED structures |
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| Institution: | 1. Nano and Heterogeneous Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China;2. State Key Laboratory of Environment-Friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, China;1. Universität Würzburg, Experimentelle Physik VII & Röntgen Research Center for Complex Material Systems (RCCM), 97074 Würzburg, Germany;2. Experimental Physics VI, Julius-Maximilians-University of Würzburg, 97074 Würzburg, Germany;3. Bavarian Center for Applied Energy Research, e.V. (ZAE Bayern), D-97074 Würzburg, Germany;4. Karlsruher Institut für Technologie (KIT), Gemeinschaftslabor für Nanoanalytik, 76021 Karlsruhe, Germany;1. Department of Physics, National Changhua University of Education, Changhua 500, Taiwan;2. National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan;1. Department of Physics, Government College University Lahore, Lahore 54000, Pakistan;2. Department of Physics, Lahore College for Woman University Lahore, Lahore 54000, Pakistan;3. Department of Physics, University of Gujrat, Gujrat 50700, Pakistan;4. School of Physical Sciences, University of the Punjab, Lahore 54000, Pakistan;1. Institut Jean Lamour, CNRS (UMR 7198), Université de Lorraine, B.P. 70239, 54506 Vandœuvre-lès-Nancy Cedex, France;2. Synchrotron SOLEIL, L''Orme des Merisiers, Saint-Aubin, B.P. 48, 91192 Gif-sur-Yvette, France;1. Fundamental and Applied Science Department, Universiti Teknologi Petronas, 32610 Bandar Seri Iskandar, Perak, Malaysia;2. Centre of Innovative Nanostructures & Nanodevices (COINN), Universiti Teknologi Petronas, 32610 Bandar Seri Iskandar, Perak, Malaysia |
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| Abstract: | We demonstrate how the quantum efficiency of an organic light-emitting diode can be improved by a physical way based on the ion beam assisted deposition: the recombination current can be increased by an enhancement of the minority carrier injection while the total current can be decreased by generation of electron traps which reduced the majority current. The quantum efficiency of fluorescence can be also improved by a layer densification with a limitation of the nonradiative centers. As a result, the quantum efficiency of the structure ITO/Helium assisted Alq3/unassisted Alq3/Ca/Al is improved (by around a factor 10) in relation with a virgin structure. |
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