Open Access Nano Express

Growth and characterization of thin Cu-phthalocyanine films on MgO(001) layer for organic light-emitting diodes

Yu Jeong Bae1, Nyun Jong Lee1, Tae Hee Kim1*, Hyunduck Cho2, Changhee Lee2, Luke Fleet3 and Atsufumi Hirohata3

Author affiliations

1 Department of Physics, Ewha Womans University, Seoul, 120-750, South Korea

2 School of Electrical Engineering and Computer Science, Seoul National University, Seoul, 151-744, South Korea

3 Department of Electronics, The University of York, York, YO10 5DD, UK

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Citation and License

Nanoscale Research Letters 2012, 7:650  doi:10.1186/1556-276X-7-650

Published: 26 November 2012

Abstract

Surface morphology and thermal stability of Cu-phthalocyanine (CuPc) films grown on an epitaxially grown MgO(001) layer were investigated by using atomic force microscope and X-ray diffractometer. The (002) textured β phase of CuPc films were prepared at room temperature beyond the epitaxial MgO/Fe/MgO(001) buffer layer by the vacuum deposition technique. The CuPc structure remained stable even after post-annealing at 350°C for 1 h under vacuum, which is an important advantage of device fabrication. In order to improve the device performance, we investigated also current-voltage-luminescence characteristics for the new top-emitting organic light-emitting diodes with different thicknesses of CuPc layer.

Keywords:
Organic light-emitting diode; Fe/MgO(001) epilayers; Cu-phthalocyanine; Thermal stability; Hybrid organic spintronics hybrid structures; 68.55-a; 81.07Pr; 81.05.Fb