Enhancement of the efficiency and the color stabilization of organic light-emitting devices fabricated utilizing stepwise doped hole transport layers |
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| Institution: | 1. Division of Materials Science & Engineering, Hanyang University, Republic of Korea;2. Department of Materials Science & Engineering, Seoul National University of Science & Technology, Republic of Korea;3. Advanced Functional materials R&D Group, Korea Institute of Industrial Technology (KITECH), Republic of Korea;4. Engineering Ceramic Center, Korea Institute of Ceramic Engineering & Technology (KICET), Republic of Korea;1. Department of Computer Science, Friedrich-Alexander University, Martensstr. 3, Erlangen-Nürnberg, Germany;2. Department of Information Systems, College of Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 133-791, Republic of Korea;3. Graduate School of Biomedical Science and Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 133-791, Republic of Korea |
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| Abstract: | The electrical and the optical properties of organic light-emitting devices (OLEDs) consisting of aluminum (Al)/lithium quinolate/tris (8-hydroxyquimoline) Al/5,6,11,12-tetraphenylnaphthacene (rubrene)-doped N,N′-bis-(1-naphthyl)-N,N′-diphenyl-1,1-biphenyl-4,4′-diamine (NPB)/indium-tin-oxide/glass structures fabricated with uniformly doped and stepwise-doped hole transport layers (HTLs) were investigated. The turn-on voltage of the OLEDs fabricated utilizing a stepwise-doped HTL was smaller than that of the OLEDs fabricated with a uniformly doped HTL, and the corresponding luminance at the same voltage was higher. The Commission Internationale de l'Eclairage (CIE) chromaticity coordinates of the OLEDs fabricated utilizing a stepwise-doped HTL became stabilized, and the CIE chromaticity coordinates of the OLEDs at 12 V was (0.43, 0.53), indicative of a yellow emission corresponding to the rubrene layer. The luminescence mechanisms of the OLEDs fabricated utilizing a stepwise-doped HTL are described on the basis of the experimental results. |
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