TITLE:
Polyfluorene-Polytriarylamine Block Copolymer as an Additive for Electroluminescent Devices Based on Polymer Blends
AUTHORS:
Mehdi Jahanfar, Ying Tan, Kousuke Tsuchiya, Takeshi Shimomura, Kenji Ogino
KEYWORDS:
Polyfluorene; Polytriarylamine; Block Copolymer; Polymer Blend; Polymer-Light Emitting Diode
JOURNAL NAME:
Open Journal of Organic Polymer Materials,
Vol.3 No.2,
April
29,
2013
ABSTRACT: Electroluminescent characteristics were investigated for the blue emitting devices fabricated with the blend systems consisting of hole transporting polytriarylamine (PTAA), electron transporting polyfluorene (PF), and a block copolymer with both segments (PF-b-PTAA) as an active layer in order to elucidate the relationship between the chemical nature and morphology of the active layer, and EL performance. The addition of PF-b-PTAA to PF homopolymer afforded the hole injecting and/or electron blocking ability to increase the efficiency. The addition to PF/PTAA blend keeping the chemical composition constant also improved the performance by controlling the morphology and/or the domain size in phase-separated films.