Performance improvement of the organic light-emitting diodes by using a LiF/pyromellitic dianhydride stacked cathode interfacial layer

Eunkyoung Nam, Mi Ran Moon, Donggeun Jung, Sungwoo Lee, Heeyeop Chae, Jae Hyun Cho, Junsin Yi, Sang Han Park, Mann Ho Cho, Hyoungsub Kim

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Abstract

A bilayered cathode interfacial structure consisting of lithium fluoride (LiF) and pyromellitic dianhydride (PMDA) was used between Al and tris-(8-hydroxyquinoline) aluminum (Al q3) in the organic light-emitting diode (OLED), and a better performance enhancement compared to the OLED with a single LiF interfacial layer was achieved by using an optimal thickness combination of the bilayered interfacial structure (0.3 nm LiF/0.7 nm PMDA). The bilayered interfacial stucture with an optimum thickness combination decreased the parallel bulk resistance and lowered the electron injection barrier height between Al and Al q3 according to the impedance and in situ ultraviolet photoelectron spectroscopy measurements, respectively.

Original languageEnglish
Pages (from-to)J425-J428
JournalJournal of the Electrochemical Society
Volume157
Issue number12
DOIs
Publication statusPublished - 2010 Nov 24

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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