Electron injection and transport mechanisms of an electron transport layer in OLEDs

Chieh Tze Sun, I. Hao Chan, Po Ching Kao, Sheng-Yuan Chu

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Electron injection and transport are key issues in the performance of organic light-emitting diodes (OLEDs). In this paper, an efficient n-doped electron transport layer (ETL) composed of 4,7-diphenyl-1,10-phenanthroline (Bphen) and lithium acetate (CH3COOLi) is demonstrated. The results reveal that the Fermi level moves toward the lowest unoccupied molecular orbital (LUMO), which consequently reduces the electron injection barrier and further enhances the efficiency of electron injection from the aluminum cathode. The mobility of electrons in the Bphen layer increased with CH3COOLi doping. In addition, a sky-blue fluorescent OLED was fabricated using the CH3COOLi-doped Bphen ETL, exhibiting a high luminance and efficiency. We also proved that as an n-type dopant, LiAC is more capable than LiF.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume158
Issue number12
DOIs
Publication statusPublished - 2011 Nov 22

Fingerprint

Electron injection
Organic light emitting diodes (OLED)
light emitting diodes
injection
Doping (additives)
electrons
Molecular orbitals
Fermi level
Aluminum
Luminance
Lithium
Cathodes
Electrons
luminance
sky
Electron Transport
acetates
molecular orbitals
lithium
cathodes

All Science Journal Classification (ASJC) codes

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

Cite this

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abstract = "Electron injection and transport are key issues in the performance of organic light-emitting diodes (OLEDs). In this paper, an efficient n-doped electron transport layer (ETL) composed of 4,7-diphenyl-1,10-phenanthroline (Bphen) and lithium acetate (CH3COOLi) is demonstrated. The results reveal that the Fermi level moves toward the lowest unoccupied molecular orbital (LUMO), which consequently reduces the electron injection barrier and further enhances the efficiency of electron injection from the aluminum cathode. The mobility of electrons in the Bphen layer increased with CH3COOLi doping. In addition, a sky-blue fluorescent OLED was fabricated using the CH3COOLi-doped Bphen ETL, exhibiting a high luminance and efficiency. We also proved that as an n-type dopant, LiAC is more capable than LiF.",
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Electron injection and transport mechanisms of an electron transport layer in OLEDs. / Sun, Chieh Tze; Chan, I. Hao; Kao, Po Ching; Chu, Sheng-Yuan.

In: Journal of the Electrochemical Society, Vol. 158, No. 12, 22.11.2011.

Research output: Contribution to journalArticle

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AU - Kao, Po Ching

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