Low sublimation temperature cesium pivalate complex as an efficient electron injection material for organic light-emitting diode devices

Ronggang Shangguan, Guangyuan Mu, Xianfeng Qiao, Lei Wang*, Kok Wai CHEAH, Xunjin ZHU, Chin H. Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

Cesium pivalate ((CH3)3CCOOCs) has been synthesized and applied as an electron injection material for organic light-emitting diodes, which showed low sublimation temperature of 180 °C. Typical bilayer structure of ITO/NPB (60 nm)/Alq3 (50 nm)/EIL/Al was used to evaluate the electron injection efficacy of (CH3)3CCOOCs, the results showed (CH3)3CCOOCs/Al exhibits better electron injection than LiF/Al cathode and the power efficiency was improved by about 19% at current density of 50 mA/cm2. More interestingly, in the typical three layer OLED structure ITO/2-TNATA (60 nm)/NPB (10 nm)/Alq3:2% C545T (40 nm)/MADN (15 nm)/(CH3)3CCOOCs (2 nm)/Al, the maximum current efficiency is up to 20 cd/A with Commission Internationale d'Eclairage (CIEx,y) color coordinates of (x = 0.30, y = 0.65) at current density of 140 mA/cm2, which indicates that the non-aromatic alkali metal complex can also have good match with the chemically stable compound and exhibit good electron injection properties.

Original languageEnglish
Pages (from-to)1957-1962
Number of pages6
JournalOrganic Electronics
Volume12
Issue number11
DOIs
Publication statusPublished - Nov 2011

Scopus Subject Areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

User-Defined Keywords

  • Cesium pivalate
  • Electron injection material
  • Organic light-emitting devices

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