Synthesis and Characterization of Photo-induced Cross-linkable Poly(fluorene-co-triphenylamine) and Applications on Polymer Light-emitting Diodes
Date Issued
2012
Date
2012
Author(s)
Lin, Yu-Shian
Abstract
In this studies, a series of copolymers were synthesized by triphenylamine and fluorene via Suzuki-Miyamura reaction, which were characterized by gel permeation chromatography (GPC), thermal gravimetric analyzer (TGA), differential scanning calorimeter (DSC), cyclic voltammetry (CV), absorption and photoluminescence spectroscopy (PL).
The polymers were cross-linked by adding the triphenylamine derivative and the photo acid generator which catalyzed Friedel-Crafts reaction under UV irradiation. This approach can be implemented to PLED applications as hole-transporting layer. Under the optimized conditions, the polymeric light-emitting device (PLED) of ITO/photo-cross-linkable HTL/PVK-Ir(ppy)3-PBD/Mg-Ag, with a turn-on voltage of 9.4 V (100 cd/m2), a maximum brightness of 7630 cd/m2, and a current efficiency of 15.8 cd/A was achieved.
The polymer which modified with ferrocene units by Friedel-Crafts reaction could be cross-linked by triphenylamine derivative under UV irradiation. This moiety is introduced into the polymer light-emitting diodes to help the hole injection. In addition, the polymer could undergo electropolymerization by cyclic voltammetry.
Subjects
PLED
hole-transporting layer
photo-crosslink
triphenylamine
fluorene.
Type
thesis
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