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Journal of Nanomaterials
Volume 2013 (2013), Article ID 870254, 4 pages
http://dx.doi.org/10.1155/2013/870254
Research Article

A Flexible Blue Light-Emitting Diode Based on ZnO Nanowire/Polyaniline Heterojunctions

1School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 20093, China
2School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200235, China

Received 14 June 2013; Accepted 5 September 2013

Academic Editor: Wen Lei

Copyright © 2013 Y. Y. Liu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

An organic/inorganic light-emitting diode (LED) consisting of n-type vertically aligned ZnO nanowires (NWs) and p-type proton acid doped polyaniline (PANi) is reported. The device was fabricated on flexible indium-tin-oxide (ITO) coated polyethylene terephthalate (PET) substrate. A broad blue light emission band ranging from 390 nm to 450 nm was observed in the electroluminescence (EL) spectra of the device, which was related to the interface recombination of electrons in the conduction band of ZnO NWs and holes in the polaron level of PANi. The turn-on voltage of the device is ~3.5 V, lower than most of ZnO NWs based LED devices. In combination with the easy fabrication, flexibility, low power consumption, and mechanical robustness, this novel device is very promising in the application of blue LEDs.