Efficient deep-blue organic light-emitting diodes: Arylamine-substituted oligofluorenes

Zhi Qiang Gao*, Zhong Hui Li, Ping Fan Xia, Ricky M S WONG, Kok Wai CHEAH, Chin H. Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

120 Citations (Scopus)

Abstract

Novel deep-blue-light-emitting diphenylamino and triphenylamino end-capped oligofluorenes were synthesized by double palladium-catalyzed Suzuki cross-coupling of dibromo-oligofluorene with the corresponding boronic acid as a key step. These oligofluorenes exhibit deep-blue emission (λ maxem = 429-432 nm), low and reversible electrochemical oxidation (highest occupied molecular orbital = 5.15-5.20 eV), high fluorescence quantum yield (ΦFL=0.61-0.93), and good thermal properties (glass-transition temperature, Tg = 99-195°C and decomposition temperature, Tdec > 450°C). Remarkably, saturated deep-blue organic light-emitting diodes, made from these oligofluorenes as dopant emitters, have been achieved with excellent performance and maximum efficiencies up to 2.9 cd A-1 at 2 mAcm-2 (external quantum efficiency of 4.1 %) and with Commission Internationale de l'Éclairage (x,y) coordinates of (0.152,0.08), which is very close to the National Television System Committee standard blue.

Original languageEnglish
Pages (from-to)3194-3199
Number of pages6
JournalAdvanced Functional Materials
Volume17
Issue number16
DOIs
Publication statusPublished - 5 Nov 2007

Scopus Subject Areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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