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Electroluminescent characteristics of spin-assembled multilayer films with confined layer structure

Cited 3 time in Web of Science Cited 3 time in Scopus
Authors
Kim, Hosub; Cho, Jinhan; Kim, Dong Young; Char, Kookheon
Issue Date
2007-05-03
Publisher
Elsevier
Citation
Thin Solid Films 516 (2007) 78
Keywords
MultilayerSpin-assemblyQuantum confinementLayer-by-layer
Abstract
Multilayer films composed of poly(p-phenylene vinylene) (PPV) as the semiconducting polymer and poly(methacrylic acid) (PMAA) as the insulating polymer were fabricated by spin-assembly method. These films, comprising a confined layer structure, showed that the water contact angles are periodically and distinctly oscillated when the top surface layer is alternated between PPV precursor and PMAA. The turn-on voltage of the multilayer electroluminescent (EL) devices increased from 2.6 V to 9.8 V as the thickness of the PMAA layer inserted between neighboring PPV layers was increased from 0 (i.e., PPV single layer film) to 2.0 nm. Furthermore, the emission peaks in the photoluminescent and EL spectra of these devices were strongly blue-shifted due to excitons formed at the confined PPV layers. Particularly when inserting about 1.0 nm thick PMAA layers, which possibly induced a tunneling effect on the charge carriers (i.e., holes and electrons), these multilayer films decreased the mobility of the hole carriers in the PPV layers with strong hole transporting characteristics, and therefore increased the recombination probability in the emitting layer with confined geometry. As a result, the device efficiency was significantly improved in comparison with that of a PPV single layer device without PMAA layer and with that of devices with relatively thick PMAA layers of 1.4 or 2.0 nm.
ISSN
0040-6090
Language
English
URI
http://hdl.handle.net/10371/5753
DOI
https://doi.org/10.1016/j.tsf.2007.04.152
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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