Colored reflective organic light-emitting device without bias |
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| Affiliation: | 1. Department of Photonics Engineering, Yuan Ze University, Taoyuan, Taiwan, ROC;2. Department of Electronic Engineering, Ming Chuan University, Taoyuan, Taiwan, ROC;3. Center for Measurement Standards, Industrial Technology Research Institute, Hsinchu, Taiwan, ROC;1. Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, 199 Ren-Ai Road, Suzhou Industrial Park, Suzhou, Jiangsu 215123, PR China;2. Center of Polymers and Organic Solids, Departments of Chemistry & Biochemistry, University of California, Santa Barbara, CA 93106, USA;1. Institute of Microelectronics and Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan 701, Taiwan;2. Department of Applied Science, National Taitung University, Taitung 950, Taiwan;3. Institute of Electro-Optical and Materials Science, National Formosa University, Huwei, Yunlin 632, Taiwan;4. Department of Electrical Engineering, Kun Shan University, Tainan 710, Taiwan;1. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China;2. State Key Laboratory of Organic–Inorganic Composites, Department of Polymer Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China;3. Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China |
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| Abstract: | Under white ambient illumination and without bias, a reflective organic light-emitting device (ROLED) comprising a microcavity cathode exhibited various colors for static information display applications by means of internal interference and absorption effects. The configuration of this microcavity cathode was a metal/organometallic/metal structure of Al (10 nm)/Ag (15 nm)/Ag nanoparticles doped inside tris(8-hydroxyquinolinato) aluminum (Alq3) (x nm)/Al (100 nm) with excellent conductivity. The thickness of the Ag:Alq3 played a crucial role in determining the reflection color; for example, varying it from 20, 40, 60, 80 and 100 nm yielded the colors light yellow, light orange, reddish purple, greenish blue, and light green, respectively. In the dark, this ROLED can be used to display information with an ultra-high contrast ratio by applying on a small bias, like conventional OLED displays. Hence, this ROLED is a highly promising candidate for applications in energy-saving electronic fixed-pattern signs, logos, indicators, and manual information displays. |
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| Keywords: | Reflective Organic light-emitting device Microcavity |
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