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

Research output: Contribution to journalArticle

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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Coordination Complexes
Organic light emitting diodes (OLED)
Photoelectron spectroscopy
Charge injection
Electrodes
Electric potential
Metals
Ultraviolet spectroscopy
Polymer films
Polyimides
Electronic structure
Luminance
Atomic force microscopy
Adhesion
X rays
Thin films
Electrons

All Science Journal Classification (ASJC) codes

  • Chemistry (miscellaneous)
  • Polymers and Plastics

Cite this

Lee, Jae Gyoung ; Kim, Youngkyoo ; Kwon, Soon Nam ; Jeong, Kwangho. / Characteristics of organic light-emitting diode modified with mixed layer of chelate complex and metal. In: Korea Polymer Journal. 1998 ; Vol. 6, No. 3. pp. 270-274.
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Characteristics of organic light-emitting diode modified with mixed layer of chelate complex and metal. / Lee, Jae Gyoung; Kim, Youngkyoo; Kwon, Soon Nam; Jeong, Kwangho.

In: Korea Polymer Journal, Vol. 6, No. 3, 01.12.1998, p. 270-274.

Research output: Contribution to journalArticle

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AU - Lee, Jae Gyoung

AU - Kim, Youngkyoo

AU - Kwon, Soon Nam

AU - Jeong, Kwangho

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AB - 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.

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