Device performance enhancement in polymer light-emitting diodes by introducing titanium oxide layer

Sun Hee Kim; Jin Young Kim; Sung Heum Park; Kwanghee Lee

doi:10.1117/12.616067

9 October 2005 Device performance enhancement in polymer light-emitting diodes by introducing titanium oxide layer

Sun Hee Kim, Jin Young Kim, Sung Heum Park, Kwanghee Lee

Proceedings Volume 5937, Organic Light-Emitting Materials and Devices IX; 59371G (2005) https://doi.org/10.1117/12.616067
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

One of the serious problems in polymer light-emitting diodes (PLEDs) is the difficulty of electron injection in the current PLEDs device of anode/polymer/cathode geometry. This is particularly true for the case of aluminum (Al) electrode. The work function of Al is too high to match with the Lowest Unoccupied Molecular Orbit (LUMO) level of the luminescent polymers, thereby lowering the device efficiency. In this work, by introducing solution-based titanium oxide (TiO_x) thin film as an electron injection layer between the polymer and Al electrode, we demonstrate that the devices exhibit an enhanced efficiency. The TiO_x layer reduces the barrier height between the polymer and aluminum (Al) cathode, thereby facilitating the electron injection in the devices.

Citation Download Citation

Sun Hee Kim, Jin Young Kim, Sung Heum Park, and Kwanghee Lee "Device performance enhancement in polymer light-emitting diodes by introducing titanium oxide layer", Proc. SPIE 5937, Organic Light-Emitting Materials and Devices IX, 59371G (9 October 2005); https://doi.org/10.1117/12.616067

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