Characteristics of organic light-emitting diode modified with mixed layer of chelate complex and metal

Jae Gyoung Lee, Youngkyoo Kim, Soon Nam Kwon, Kwangho Jeong

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Abstract

Organic light-emitting diodes (OLED) were successfully fabricated using the thin polymeric film by dispersing a hole transport material into a soluble polyimide and the molecular film of a chelate complex. In order to improve the injection of electrons into the emissive layer as well as the interfacial adhesion, we have attempted the mixing of the chelate complex and metal between the emissive layer and the cathodic electrode. The structural investigations of the mixed layer between the chelate complex and metal electrode were carried out using x-ray photoemission spectroscopy (XPS) and atomic force microscopy (AFM). Especially, ultraviolet photoemission spectroscopy (UPS) was applied to verify the electronic structure of the mixed layer. The charge injection of the device having the mixed layer was initialized at the applied voltage of 4.19 V, and the brightness was about 103 cd/m2 at 7 V. The dramatic enhancement in the oscillator strength was observed from the electroluminescent spectra measured with the applied voltage.

Original languageEnglish
Pages (from-to)270-274
Number of pages5
JournalKorea Polymer Journal
Volume6
Issue number3
Publication statusPublished - 1998 Dec 1

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All Science Journal Classification (ASJC) codes

  • Chemistry (miscellaneous)
  • Polymers and Plastics

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