Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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White Electroluminescence from Bicarbazyl-containing Conjugated Polymers as Single-Emitting Component

  • Kang, In-Nam (Department of Chemistry, The Catholic University of Korea) ;
  • Kim, Yang-Bae (Institute of Photonics & Surface Treatment, Q-sys Co., Ltd) ;
  • Lim, Sung-Hwan (Functional Materials Lab., Department of Polymer Science and Engineering, Chungju National University) ;
  • Chung, Min-Chul (Department of Chemical Engineering, Sunchon National University) ;
  • Oh, Se-Young (Department of Chemical & Biomolecular Engineering/Interdisciplinary Program of Integrated Biotechnology,Sogang University) ;
  • Kim, Sung-Ryong (Functional Materials Lab., Department of Polymer Science and Engineering, Chungju National University) ;
  • Lee, Ji-Hoon (Functional Materials Lab., Department of Polymer Science and Engineering, Chungju National University)
  • Published : 2008.01.20
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Abstract

Two bicarbazyl-containing fluorene copolymers, PFEBCz (95/5) and PFEBCz (75/25), were synthesized for white light electroluminescence from a single emitting polymer. All synthesized polymers were soluble in common organic solvents such as chloroform and toluene. The weight-average molecular weights (Mw) of the PFEBCz (95/5) and PFEBCz (75/25) copolymers were found to be 11,000 and 5,700 with polydispersity indices 1.4 and 1.8. The EL spectrum of the PFEBCz (75/25) device showed bright white-light emission with CIE coordinates of (0.32, 0.34) at 1000 cd/m2, which is very close to that for pure white (0.33, 0.33). This white emission may have been due to strong excimer formation between the bicarbazyl and fluorene polymer backbone. The device exhibited a maximum brightness of 3400 cd/m2 with a maximum efficiency of 0.2 cd/A.

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