Open AccessStudy of electroluminescence and electron injection on novel red polyelectrolytes copolymer
Author(s) -
Lintao Hou,
Fei Huang,
Junbiao Peng,
Yong Cao
Publication year - 2007
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.56.6104
Subject(s) - electroluminescence , materials science , polyelectrolyte , cathode , work function , copolymer , polymer , diode , layer (electronics) , optoelectronics , polyfluorene , conjugated system , electron , double layer (biology) , current density , nanotechnology , composite material , chemistry , physics , quantum mechanics
Single-layer polymer light-emitting diodes with high work function gold cathode were fabricated using a series of novel conjugated polyelectrolytes and their neutral precursors: aminoalkyl-substituted polyfluorenes with different 4,7-di-2-thienyl-2,1,3-benzothiadiazole contents. At the current density of 38.7mA/cm2, the external efficiency reaches 0.42% with the Commission Internationale de I'Eclairage coordinates x=0.67 and y=0.33 for PFN-DBT10. It has been shown that these polymers also can be used as electron injection layer in double-layer devices with high work function gold cathode, which favors the manufacture of solution processing multilayer devices. Based on single-layer and double-layer device structures, it was found that the improvement of device performance is attributed to the interface effect between gold cathode and polyelectrolytes layer.