Enhancement of the efficiency and the color stabilization of organic light-emitting devices fabricated utilizing stepwise doped hole transport layers
- Authors
- Yang, HW; Yoon, YB; Kim, TW; Kwack, KD; Kim, JH; Seo, JH; Kim, YK
- Issue Date
- Jan-2006
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- organic crystals; electronic transport; optical properties
- Citation
- SOLID STATE COMMUNICATIONS, v.137, no.1-2, pp.87 - 90
- Journal Title
- SOLID STATE COMMUNICATIONS
- Volume
- 137
- Number
- 1-2
- Start Page
- 87
- End Page
- 90
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/24591
- DOI
- 10.1016/j.ssc.2005.10.005
- ISSN
- 0038-1098
- 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-tetraphenyinaphthacene (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. (c) 2005 Elsevier Ltd. All rights reserved.
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