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Dramatically improving polymer light-emitting diode performance by doping with inorganic salt

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2 Author(s)
Zhao, Wei ; Center for Materials Chemistry, Department of Chemistry and Biochemistry, The University of Texas at Austin, Austin, Texas 78712 ; White, J.M.

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A simple method is described that dramatically lowers the turn-on voltage of polymer light-emitting diodes (PLEDs) by doping the electroluminescent polymer with an inorganic salt. Single-layer PLEDs were fabricated by spin-coating a solution of poly(9,9-dioctylfluorene), doped with controlled amounts of LiBr, onto an indium tin oxide-coated glass (anode) followed by physical vapor deposition of an Al cathode. The turn-on voltage dropped from the undoped value of 7.4 V as low as to 3.0 V. These results are discussed in terms of alterations of the cathode-polymer and anode-polymer interfaces by Li+ and Br-.

Published in:

Applied Physics Letters  (Volume:87 ,  Issue: 10 )

Date of Publication:

Sep 2005

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