Abstract
A new graphene oxide–cobalt porphyrin (GO–CoTPP) hybrid material has been used as an emissive layer in organic light-emitting diodes (OLEDs). Devices with fundamental structure of indium-doped tin oxide (ITO)/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS, 45 nm)/polyvinylcarbazole (PVK):2-(4-biphenyl)-5-(4-t-butylphenyl)-1,3,4-oxadiazole (PBD):GO–CoTPP (70 nm)/1,3,5-tris(N-phenylbenzimidazol-2-yl)-benzene (TPBI, 20 nm)/Al (150 nm) were fabricated. A red electroluminescence (EL) was obtained from thin-film PVK:PBD:CoTPP at 70 nm thickness. When CoTPP was covalently grafted on graphene oxide (GO) sheets, near-white EL was obtained. The white emission, which was composed of bluish green and red, is attributed to electroplex formation at the GO–CoTPP/PBD interface. Such electroplex emission between electrons and holes is a reason for the low turn-on voltage of the GO–CoTPP-based OLED. Maximum luminance efficiency of 1.43 cd/A with Commission International de l’Eclairage coordinates of 0.33 and 0.40 was achieved at current of 0.02 mA and voltage of 14 V.
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Acknowledgements
The author would like to thank Shahid Beheshti University and Urmia University of Technology for supporting this work. The author also thanks Dr. H. Hosseini at the Department of Chemistry for preparing the GO–CoTPP material.
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Janghouri, M. Electroluminescence and Photoluminescence from a Fluorescent Cobalt Porphyrin Grafted on Graphene Oxide. J. Electron. Mater. 46, 5635–5641 (2017). https://doi.org/10.1007/s11664-017-5627-1
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DOI: https://doi.org/10.1007/s11664-017-5627-1