Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1596920 | Solid State Communications | 2006 | 4 Pages |
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,Nâ²-bis-(1-naphthyl)-N,Nâ²-diphenyl-1,1-biphenyl-4,4â²-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 12Â 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.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
H.W. Yang, Y.B. Yoon, T.W. Kim, K.D. Kwack, J.H. Kim, J.H. Seo, Y.K. Kim,