High contrast ratio organic light-emitting devices based on CuPC as electron transport material |
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| Affiliation: | 1. Graduate Institute of Electro-Optical Engineering and Department of Electrical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, Taiwan, ROC;2. RiTdisplay Corporation, No. 12, Kuanfu N. Road, Hsin-Chu Industrial Park, Taiwan, ROC;1. Chemistry Department, College of Science, University of Anbar, Ramadi, Iraq;2. Raman Research Institute, Soft Condensed Matter Group, Sadashivanagara, Bengaluru 560080, Karnataka, India;3. Chemistry Department, College of Science for Women, University of Baghdad, Baghdad, Iraq;4. Department of Chemistry, Central College Campus, Bangalore University, Bengaluru 560001, Karnataka, India;5. Liquid Crystal Research Laboratory, School of Chemical Sciences, Universiti Sains Malaysia, Minden 11800, Penang, Malaysia;1. Low Dimensional Materials Research Centre (LDMRC), Department of Physics, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia;2. Department of Physics, College of Education, Salahaddin University-Hawler, 44001Erbil, Kurdistan Region, Iraq;3. Department of Electrical Engineering, College of Engineering, Qatar University, P.O. Box 2713 Doha,Qatar;4. School of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi,Selangor, Malaysia;1. Centre of Chemistry, University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal;2. Centre of Physics, University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal;1. Technical Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India;2. Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India |
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| Abstract: | In this paper, a high-contrast-ratio organic light-emitting device (OLED) of high brightness is demonstrated. In this device, reflection from the cathode is reduced by inserting a copper-phthalocyanine (CuPC) layer between the emitting layer (EML) and the cathode called the Black Cathode™ technique. The absorption and the destructive interference effect caused by this layer lead to the decrease of the ambient light. With the same injection current density at 6 mA/cm2, the contrast ratio of this device increases from 1.9 to 2.5 under 1000 lx illumination, when compared with a conventional device. Although the thickness of this device increases by 54.5%, its driving voltage is nearly the same as that of a conventional device. This result implies the high electron mobility in the inserted CuPC layer. |
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