Improvement of EL efficiency in polymer light-emitting diodes by heat treatments

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Efficiency of polymer light-emitting diodes (LEDs) would depend upon the heat treatment condition and procedure greatly. We have tried thermal annealing at the temperature above T-g of the emissive polymer, poly[2-methoxy-5-(2'-ethly-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV), before and after Al deposition, respectively, in ITO/MEH-PPV/A1 structure. The anomalous semiconducting behavior of an unannealed device has been screened out by appropriate heat treatments. It is remarkable that the annealing treatment after Al deposition makes the EL efficiency enhanced by two orders and reduces the operating voltage about 40%. The high temperature annealing after Al deposition enhances the interface adhesion between the emissive polymer and the Al cathode, and might form an interfacial polymer layer with wide band gap, which seems to play a critical role to improve the efficiency of EL devices. (C) 2001 Elsevier Science B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2001-02
Language
English
Article Type
Article; Proceedings Paper
Citation

SYNTHETIC METALS, v.117, no.1, pp.249 - 251

ISSN
0379-6779
URI
http://hdl.handle.net/10203/5075
Appears in Collection
CBE-Journal Papers(저널논문)
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