Improvement of efficiency and colour purity of red-dopant organic light-emitting diodes by energy levels matching with the host materials

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

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Author(s)

  • Baijun Chen
  • Xiaoqin Lin
  • Laifung Cheng
  • William A. Gambling
  • Shuit-Tong Lee

Detail(s)

Original languageEnglish
Pages (from-to)30-35
Journal / PublicationJournal of Physics D: Applied Physics
Volume34
Issue number1
Publication statusPublished - 7 Jan 2001

Abstract

By using a series of tris-(8-hydroxyquinoline) metal chelates with central metal ions of Al3+, Ga3+, In3+ as the host materials, red organic light-emitting diodes have been fabricated, which used a red fluorescent dye, 4-(dicyanomethylene)-2-t-butyl-6-(8-methoxy-1,1,7,7- tetramethyljulolidyl-9-enyl)4H-pyran (DCJMTB), as the emitter or guest dopant material. The doped devices with Gaq3 as the host materials produce high efficiencies and saturated red colour chromaticity. The device (1% DCJMTB doped in Gaq3) showed a current efficiency of 2.64 cd A-1, which is about 40% higher than that of the doped Alq3 device, and nearly two times higher than that of the doped Inq3 device at 1% DCJMTB dopant concentration. The colour coordinates of the Gaq3:1% DCJMTB device in the Commission internationale del'Eclairage chromaticity chart are x = 0.63 and y = 0.36.

Citation Format(s)

Improvement of efficiency and colour purity of red-dopant organic light-emitting diodes by energy levels matching with the host materials. / Chen, Baijun; Lin, Xiaoqin; Cheng, Laifung; Lee, Chun-Sing; Gambling, William A.; Lee, Shuit-Tong.

In: Journal of Physics D: Applied Physics, Vol. 34, No. 1, 07.01.2001, p. 30-35.

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