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Research

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Publication details for Professor Michael Petty

Ahn, JH, Wang, CS, Perepichka, IF, Bryce, MR & Petty, MC (2007). Blue organic light emitting devices with improved colour purity and efficiency through blending of poly(9,9-dioctyl-2,7-fluorene) with an electron transporting material. Journal of Materials Chemistry 17(29): 2996-3001.
  • Publication type: Journal Article
  • ISSN/ISBN: 0959-9428

Author(s) from Durham

Abstract

Organic light emitting devices (OLEDs) containing a single blended
layer of poly(9,9- dioctyl-2,7-fluorene) (PFO) or
poly[9,9-bis(4-octyloxyphenyl)-2,7-fluorene] (PFOPh) and an electron
transporting material
2,7-bis[2-(4-tert-butylphenyl)-1,3,4-oxadiazol-5-yl]-9,9-dihexylfluorene
(DFD) have been fabricated. The long-wavelength emission (> 480 nm)
observed for pure PFO and PFOPh structures was reduced significantly
and a pure blue emission, with Commission Internationale de l'Eclairage
(CIE) colour coordinates (0.157, 0.037), could be achieved. The
blended-layer devices also possessed considerably higher efficiencies
than the pure PFO, pure PFOPh or the pure DFD structures. It is
suggested that the presence of DFD results in an improved balance of
charge carriers and provides a micro-encapsulation environment for the
polymer chains, hindering the formation of fluorenone defects and their
red-shifted emission.