Improved color purity and efficiency of blue organic light-emitting diodes via suppression of exciplex formation

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Baijun Chen
  • X. H. Zhang
  • X. Q. Lin
  • N. B. Wong
  • W. A. Gambling
  • S. T. Lee

Detail(s)

Original languageEnglish
Pages (from-to)193-196
Journal / PublicationSynthetic Metals
Volume118
Issue number1-3
Publication statusPublished - 1 Mar 2001
Externally publishedYes

Abstract

Exciplex emission has been suppressed by doping an emitter in an electron-transporting host in blue organic light-emitting diodes. The dopant, 5,5′-bis(dimesitylboryl)-2,2′-bithiophene (BMB-2T), was a thermally stable electron-transporting material with a high fluorescence quantum efficiency. BMB-2T was doped into a trimer of N-arylbenzimidazoles (TPBI) which functioned as the host and electron-transporting layer. N,N′-bis(3-methylphenyl)-N,N′-diphenyl-[1,1′-biphenyl]- 4,4′-diamine (TPD) was used as the hole-transporting layer. The device, with a structure of indium tin oxide (ITO)/TPD/TPBI:BMB-2T/TPBI/Mg:Ag, showed a bright emission of 2200 cd/m2 at a current density of 240 mA/cm2 and with a pure blue emission peaking at 446 nm (chromaticity coordinates: x = 0.15, y = 0.12) at 3 wt.% dopant concentration.

Citation Format(s)

Improved color purity and efficiency of blue organic light-emitting diodes via suppression of exciplex formation. / Chen, Baijun; Zhang, X. H.; Lin, X. Q. et al.
In: Synthetic Metals, Vol. 118, No. 1-3, 01.03.2001, p. 193-196.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review