Monodisperse starburst oligofluorene-functinalized 4,4',4''-Tris(carbazol-9-yl)-triphenylmaines: their synthesis and deep-blue fluorescence properties for organic light-emitting diode applications

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DOIResolve DOI: http://doi.org/10.1002/adfm.200600104
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TypeArticle
Journal titleAdvanced Functional Materials
ISSN1616-301X
1616-3028
Volume17
Issue6
Pages10281036; # of pages: 9
SubjectSynthesis
AbstractFour monodisperse starburst oligomers bearing a 4,4′,4″-tris(carbazol-9-yl)-triphenylamine (TCTA) core and six oligofluorene arms are synthesized and characterized. The lengths of oligofluorene arms vary from one to four fluorene units, giving the starburst oligomers molecular weights ranging from 3072 to 10 068 Da (1 Da = 1.66 × 10–27 kg). All of the starburst oligomers have good film-forming capabilities, and display bright, deep-blue fluorescence (λmax = 395–416 nm) both in solution and in the solid state, with the quantum efficiencies of the films (ΦPL) varying between 27 and 88 %. Electrochemical studies demonstrate that these materials have large energy gaps, and are stable for both p-doping and n-doping processes. Electroluminescent devices are successfully fabricated using these materials as hole-transporting emitters, and emit deep-blue light. Devices with luminance values up to 1025 cd m–2 at 11 V and luminous efficiencies of 0.47 cd A–1 at 100 cd m–2 have been produced, which translates to an external quantum efficiency of 1.4 %. In addition, these large-energy-gap starburst oligomers are good host materials for red electrophosphorescence. The luminance of the red electrophosphorescent devices is as high as 4452 cd m–2, with a luminous efficiency of 4.31 cd A–1 at 15 mA cm–2: This value is much higher than those obtained from the commonly used hole-transporting materials, such as poly(vinyl carbazole) (PVK) (1.10 cd A–1 at 16 mA cm–2).
Publication date
PublisherWiley
LanguageEnglish
AffiliationNRC Institute for Biological Sciences; National Research Council Canada
Peer reviewedNo
NRC numberLIU2007C
NPARC number9363188
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Record identifier807dc642-6da5-4b24-b156-157de3d1e547
Record created2009-07-10
Record modified2017-04-11
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