Affiliation:
1. Fortune Institute of Technology
2. National University of Kaohsiung
3. Southern Taiwan University of Science and Technology
4. National Formosa University
Abstract
A blue organic light-emitting diode (OLED) with a double hole-transporting (DHT) structure has been developed. The blue color purity was improved by modulation the thickness of CBP layer. When the thicknesses of left CBP and right CBP are respectively 8 nm and 2 nm, the more pure blue coordinates are (0.155, 0.079), which are very close to the blue coordinates of the national television system committee (NTSC) standard (0.14, 0.08). Furthermore the current density, brightness and the luminous efficiency of device with the left CBP of 8 nm and the right CBP of 2 nm are respectively 144.7 mA/cm2, 1065 cd/m2 and 0.93 cd/A.
Publisher
Trans Tech Publications, Ltd.
Reference20 articles.
1. C.W. Tang, S.A. Van Slyke, Appl. Phys. Lett. 51 (1987) 913.
2. C. Adachi, M.A. Baldo, S.R. Forrest, S. Lamansky, M.E. Thompson, R.C. Wong, Appl. Phys. Lett. 78 (2001) 1622.
3. Y. Fukuda, T. Watanabe, T. Wakimoto, S. Miyaguchi, M. Tsuchida, Synth. Met. 1 (2000) 111.
4. H.S. Bang, D.U. Lee, T.W. Kim, S.M. Han, J.H. Seo, Y.K. Kim, Thin Solid Films 516 (2008) 5649.
5. G. Li, J. Shinar, Appl. Phys. Lett. 83 (2003) 5359.