Fabrication and characterization of two-layered polymer light emitting diode with a structure of ITO/PEDOT:PSS/ MEH:PPV/Al

Namniha, Sheida; Sabaian, Mohammad

doi:10.22055/jrmbs.2018.13939

Fabrication and characterization of two-layered polymer light emitting diode with a structure of ITO/PEDOT:PSS/ MEH:PPV/Al

Document Type : Full length research Paper

Authors

Sheida Namniha

mohammad sabaian

10.22055/jrmbs.2018.13939

Abstract

In this article, we present fabrication and characterization of two-layered polymer light emitting diode (PLED) with a structure of ITO/PEDOT:PSS/MEH:PPV/Al which emits a orange-colored light, with the aim of reduction of lightening voltage. In this work, the PEDOT:PSS layer, as hole injection layer, was coated with spin coating method and a rotating speed of 2000 rpm and the MEH:PPV layer, as an active layer (emission layer), was coated with four rotating speeds. The impact of change in layer thickness on the surface roughness, optical absorption, and most importantly, the lightening voltage was investigated. Eventually, a PLED with a structure of ITO/PEDO:PSS(2000 rpm)/MEH:PPV(6000 rpm)/Al (165 nm) was selected as the optimum structure with a minimum lightening voltage of 7.1 V. The emission light ranged from 550 nm to 650 nm and was observed as an orange light.

Keywords

polymer light emitting diodes

thickness of active layer

structural properties

optical properties

Subjects

Atomic - molecular

[1] N. Thejo Kalyani, S.J. Dhoble, Organic light emitting diodes: Energy saving lighting technology-A review, Renewable and Sustainable Energy Reviews 16 (2012) 2696-2723.

[2 [Yuan-Sheng Tyan, Organic light-emitting-diode lighting overview, Journal of Photonics for Energy 1 (2011) 011009.

[3] A. Khazanchi, A. Kanwar, L. Saluja, A. Damara, V. Damara, OLED: A New Display Technology, International Journal Of Engineering And Computer Science 1 (2012) 75-84.

[4] W.X. Li, J. Hagen, R. Jones, J. Heikenfeld, A.J. Steckl, Color tunable organic light emitting diodes using Eu complex doping, Solid-State Electronics 51 (2007) 500–504.

[5] E.F. Schubert, History of light-emitting diodes, Cambridge University Press, 1-10, (2006).

[6] M. Cai, Organic Light-Emitting Diodes (OLEDs) and Optically-Detected Magnetic Resonance Studies on Organic Materials, PhD Thesis, Lowa State University (2011).

[7] R. Partridge, Electroluminescence from polyvinylcarbazole films: 4. Electroluminescence using higher work function cathodes, Polymer 24 (1983), 755-762.

]8 [C.W. Tang, S.A. van Slyke, Organic electroluminescent diodes, Applied Physics Letter 5 (1987) 913-916.

[9] J.H. Burroughes, D.D.C. Bradley, A.R. Brown, R.N. Marks, K. MacKay, R.H. Friend, P.L. Burns, A.B. Holmes, Light-emitthng diodes based on conjugated polymers, Nature 347 (1990) 539-541.

[10] P. Jiang, W. Zhu, Z. Gan, W. Huang, J. Li, H. Zeng, J. Shi, Electron transport properties of an ethanol-soluble AlQ3-based coordination polymer and its applications in OLED devices, Journal of Material Chemistry 19 (2009) 4551–4556.

[11] K. Narayan, S. Varadharajaperumal, G. Mohan Rao, M. Manoj Varma, T. Srinivas, Effect of thickness variation of hole injection and hole blocking layers on the performance of fluorescent green organic light emitting diodes, Current Applied Physics 13 (2013) 18–25.

[12] P. Jiang, W. Zhu, Z. Gan, W. Huang, J. Li, H. Zeng, J. Shi, Electron transport properties of an ethanol-soluble Alq₃-based coordination polymer and its applications in OLED devices, Journal of Material Chemistry 19 (2009) 4551–4556.

[13] J. Shinar (Ed.), Organic light-emitting devices (OLEDs) and OLED-based chemical and biological sensors: an overview, Journal of Physics D: Applied Physics, 2008 (2003) 133001.

[14] S. Jin, X. Lu, L. Lin, A.T. Wu, K. Zhao, Buffered electropolishing parameters on niobium sheet, Physical Review Special Topics-Accelerators and Beams (PRST-AB). 13, (2010).

[15] N. Mustapha, Z. Fekkai, Optical Properties of Solution-Processed MEH-PPV Thin Films for Optoelectronic Applications” Journal of Materials Science and Engineering A 1 (2011), 224-227.

[16] B.M. Omer, Optical Properties of MEH-PPV and MEH-PPV/ [6,6]-Phenyl C61-butyric Acid 3-ethylthiophene Ester Thin Films, Journal of Nano- and Electronic Physics4 (2012) 04006.

[17] N.Z. Yahya1, M. Rusop, Investigation on the Optical and Surface Morphology of Conjugated Polymer MEH-PPV:ZnO Nanocomposite Thin Films, Journal of Nanomaterials 201 (2012).