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Journal of Nanomaterials
Volume 2006 (2006), Article ID 46787, 8 pages
http://dx.doi.org/10.1155/JNM/2006/46787

Epoxy-Carbazole Polymeric Network Nanolayers for Organic Light-Emitting Devices

1Department of Polymer Science and Engineering, Pusan National University, Busan 609-735, South Korea
2Institute of Biomedical Engineering, Imperial College London, Exhibition Road, London SW7 2AZ, UK
3Samsung SDI Co. Ltd., 818 Gacheon-Ri, Samnam-Myeon, Ulju-Gu, Ulsan 689-701, South Korea
4Experimental Solid State Physics Group, Blackett Laboratory, Department of Physics, Imperial College London, Prince Consort Road, London SW7 2BW, UK

Received 24 March 2006; Revised 5 August 2006; Accepted 24 October 2006

Copyright © 2006 Jin-Woo Park 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

We report the study of epoxy-carbazole polymeric network (ECzPN) nanolayers as a hole injection/transport layer in organic light-emitting devices. The ECzPN nanolayers were prepared by the thermal curing reaction of epoxidized cresol novolak and 3,6- diaminocarbazole in the presence of catalytic amount of triphenyl phosphine. The curing reaction was examined with Fourier transformed infrared spectroscopy, whilst the thermal stability was studied with thermogravimetric analysis. Optical absorption and emission spectroscopy were employed to investigate the optical properties of ECzPN nanolayers, whilst atomic force microscopy was used to examine the surface nanomorphology of ECzPN nanolayers. The result showed that the device performance was greatly influenced by the weight ratio of monomers, because the highest occupied molecular orbital level of ECzPN was significantly changed with the ratio. This is attributed to the ground-state complexes induced by the specific interaction (hydrogen bonding) between the lone pair electrons in amines of carbazole moieties and the hydroxyl group of ring-opened epoxide moieties.