Organic light-emitting devices based on solution-processible quinolato-complex supramolecules

Jung An Cheng, H. Chen Chin, Han-Ping Shieh

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15 Scopus citations

Abstract

This paper discusses a new type of supramolecular material tris{5-N-[3-(9H-carbazol-9-yl)propyl]-N-(4-methylphenyl)aminesulfonyl-8-hydroxyquinolato} aluminum(III), Al(SCarq)(3), which we synthesized using three 5-N-[3-(9H-carbazol-9-yl)propyl]-N-(4-methylphenyl)aminesulfonyl-8-hydroxyquinoline as bidentate ligands. The peak photoluminescence in the solid phase appears at 488 nm. In cyclic voltammetric measurement, two oxidation peaks, which were obtained at -5.6 and -5.9eV, correspond to HOMO sites of carbazoyl and aluminum quinolates, respectively. in the investigation of solid morphological thin film, the flat surface was investigated using an atomic force microscope. The root mean square (rms) and mean roughness (R(a)) were respectively measured to be 0.427 and 0.343 nm. For the fabrication of organic light-emitting devices (OLEDs) using spin-coating techniques, the turn-on voltage and maximum luminescence of the optimized electroluminescence device, glass/ITO (20 nm)/PEDOT: PSS (75 nm)/Al(SCarq)(3) (85 nm)/BCP (8 nm)/LiF (1 nm)/Al (200 nm), were respectively 9.6 V and 35.0 cd m(-2). Due to the electroplex formation between the carbazole (electron-donor) and the aluminum quinolates (electron-acceptor) moieties under an applied DC bias, the chromaticity of electroluminescence shifted to green-yellow with 1931 CIE(x,y) (0.40, 0.47). (C) 2008 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)1003-1008
Number of pages6
JournalMaterials Chemistry and Physics
Volume113
Issue number2-3
DOIs
StatePublished - 15 Feb 2009

Keywords

  • OLEDs; Solution processable; Alq(3); EL
  • ALQ(3)-FUNCTIONALIZED POLYMERS; ELECTROLUMINESCENT DEVICES; SUBSTITUTED ALUMINUM; DIODES; PHOTOLUMINESCENCE; EFFICIENCY; SPECTRA; BLENDS; COLOR; FILMS

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