Uniform dispersion of triplet emitters in multi-layer solution-processed organic light-emitting diodes

Sheng Yang Huang, Hsin-Fei Meng*, Heh Lung Huang, Teng Chih Chao, Mei Rurng Tseng, Yu Chiang Chao, Sheng Fu Horng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

The influence of the iridium complex solubility on the efficiency of multi-layer solution-processed organic light-emitting diode is demonstrated by synthesized orange triplet iridium complexes with the same core. The solubility of the iridium(III) bis(4-phenylthieno[3,2-c]pyridinato-N,C2′) acetylacetonate is increased and uniform dispersion of iridium complex in polymer host poly(vinylcarbazole) is achieved by tert-butyl and n-hexyl group modification. Blade coating technique is utilized to achieve tri-layer structures with a polymer hole-transporting layer poly[(9,9-dioctylfluorenyl-2, 7-diyl)-co-(4,4′-(N-(4-s-butylphenyl))diphenylamine)], a host-guest emissive layer, and small-molecule hole-blocking layer 1,3,5-tris(N- phenylbenzimidazol-2-yl) benzene. The efficiency as high as 20 cd/A is achieved for orange-emitting device.

Original languageEnglish
Pages (from-to)2393-2396
Number of pages4
JournalSynthetic Metals
Volume160
Issue number23-24
DOIs
StatePublished - 1 Dec 2010

Keywords

  • Polymer light-emitting diodes
  • Triplet emitters

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