Solution-processed titanium oxide electron injection/transport functional layer in polymer light-emitting diodes

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

doi:10.1117/12.681241

5 December 2006 Solution-processed titanium oxide electron injection/transport functional layer in polymer light-emitting diodes

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

Author Affiliations +

Proceedings Volume 6333, Organic Light Emitting Materials and Devices X; 63331N (2006) https://doi.org/10.1117/12.681241
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

Abstract

One of the problems limiting the device efficiency of polymer light-emitting diodes is the imbalance of charge injection and transport between the electrons and holes. This problem is particularly serious for the case of aluminum (Al) electrode. By introducing solution-based titanium oxide (TiO_x) layer between the polymer and Al electrode, we have demonstrated that the devices exhibit an enhanced efficiency. The TiO_x layer reduces the barrier height between the polymer and Al cathode, thereby facilitating the electron injection in the devices and enhancing the device performance. Moreover, we also believe that the TiO_x layers prevent the diffusion of metal ions into the emitting polymers during the Al deposition process, reducing the degree of quenching centers in the active polymers.

Citation Download Citation

Sun Hee Kim, Jin Young Kim, Sung Heum Park, and Kwanghee Lee "Solution-processed titanium oxide electron injection/transport functional layer in polymer light-emitting diodes", Proc. SPIE 6333, Organic Light Emitting Materials and Devices X, 63331N (5 December 2006); https://doi.org/10.1117/12.681241

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