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Layer‐by‐Layer Spin Self‐Assembled Hole Injection Layers Containing a Perfluorinated Ionomer for Efficient Polymer Light‐Emitting Diodes
Author(s) -
Park Juhyun,
Kwon Youngnam,
Lee TaeWoo
Publication year - 2007
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200700114
Subject(s) - materials science , ionomer , layer (electronics) , work function , optoelectronics , indium tin oxide , luminescence , light emitting diode , electroluminescence , diode , polymer , indium , deposition (geology) , spin (aerodynamics) , nanotechnology , composite material , copolymer , physics , paleontology , thermodynamics , sediment , biology
Deposition of hole injection layers including a perfluorinated ionomer has been demonstrated using layer‐by‐layer spin self‐assembly for enhanced device efficiency and lifetime in PLEDs. We show that the LBL spin self‐assembled thin films enable to control work functions of indium‐tin oxide anodes by changing the PFI concentration and that a resulting green‐emitting device has an enhanced luminescence efficiency and 18 times longer half lifetime than a device using a conventional HIL. We also fabricate a gradient of energy levels by the LBL self‐assembly of the PFI that results in a work function of 5.74 eV, which can be used to improve carrier injection even for an emitting layer whose ionization potential is over 5.7 eV.