Premium
Polyaniline‐Based Conducting Polymer Compositions with a High Work Function for Hole‐Injection Layers in Organic Light‐Emitting Diodes: Formation of Ohmic Contacts
Author(s) -
Choi MiRi,
Woo SeongHoon,
Han TaeHee,
Lim KyungGeun,
Min SungYong,
Yun Won Min,
Kwon Oh Kwan,
Park Chan Eon,
Kim KwanDo,
Shin HoonKyu,
Kim MyeongSuk,
Noh Taeyong,
Park Jong Hyeok,
Shin KyoungHwan,
Jang Jyongsik,
Lee TaeWoo
Publication year - 2011
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201000338
Subject(s) - polyaniline , materials science , oled , ohmic contact , work function , optoelectronics , conductive polymer , polystyrene sulfonate , polymer , polystyrene , diode , coating , layer (electronics) , chemical engineering , nanotechnology , composite material , pedot:pss , engineering , polymerization
It is a great challenge to develop solution‐processed, polymeric hole‐injection layers (HILs) that perform better than small molecular layers for realizing high‐performance small‐molecule organic light‐emitting diodes (SM‐OLEDs). We have greatly improved the injection efficiency and the current efficiency of SM‐OLEDs by introducing conducting polymer compositions composed of polyaniline doped with polystyrene sulfonate and perfluorinated ionomer (PFI) as the HIL. During single spin‐coating of conducting polymer compositions, the PFI layer was self‐organized at the surface and greatly increased the film work function. It enhanced hole‐injection efficiency and current efficiency by introducing a nearly ohmic contact and improving electron blocking. Our results demonstrate that solution‐processed polyaniline HILs with tunable work functions are good candidates for reducing process costs and improving OLED performance.