Research Article Open Access

Electrical and Optical Properties of N, N`-Bis (Inaphthyl)-N,N`-Diphenyl-1,1`-Biphenyl-4,4`-Diamine as Hole Transport Layer in Organic Light Emitting Devices

M. Y. Lim1, W. M.M. Yunus1, Z. A. Talib1, A. Kassim1, C. F. Dee1 and A. Ismail1
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American Journal of Engineering and Applied Sciences
Volume 3 No. 1, 2010, 64-67

DOI: https://doi.org/10.3844/ajeassp.2010.64.67

Submitted On: 19 September 2009 Published On: 31 March 2010

How to Cite: Lim, M. Y., Yunus, W. M., Talib, Z. A., Kassim, A., Dee, C. F. & Ismail, A. (2010). Electrical and Optical Properties of N, N`-Bis (Inaphthyl)-N,N`-Diphenyl-1,1`-Biphenyl-4,4`-Diamine as Hole Transport Layer in Organic Light Emitting Devices. American Journal of Engineering and Applied Sciences, 3(1), 64-67. https://doi.org/10.3844/ajeassp.2010.64.67

Abstract

Problem statement: The aim of this research was to study the electrical and optical properties of N, N`-bis(Inaphthyl)-N,N`-diphenyl-1,1`-biphenyl-4,4`-diamine (NPB) organic materials often used as hole transport layer in Organic Light-Emitting Devices (OLED). Approach: The NPB layer was prepared using the thermal evaporation method. From photoluminescence spectra, two peaks at 630 and 480 nm were observed with 55 nm NPB. The electrical conductivity was strongly influenced by the layer thickness. Results: The energy band gap of each NPB layer was successfully presented in the range of 2.4-2.9 eV. Conclusion: This study successfully showed the effect of different thickness of NPB in OLED.

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Keywords

  • Thermal evaporation
  • photoluminescence
  • energy band gap
  • electrical conductivity