Open AccessEfficient hybrid organic-inorganic light emitting diodes with self-assembled dipole molecule deposited metal oxides
Author(s) -
Ji Sun Park,
Bo Ram Lee,
Jeong Yong Lee,
JiSeon Kim,
Sang Ouk Kim,
Myoung Hoon Song
Publication year - 2010
Publication title -
applied physics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 442
eISSN - 1077-3118
pISSN - 0003-6951
DOI - 10.1063/1.3453759
Subject(s) - dipole , work function , materials science , diode , molecule , optoelectronics , oled , light emitting diode , organic semiconductor , thin film , chemical physics , metal , nanotechnology , chemistry , layer (electronics) , organic chemistry , metallurgy
We investigate the effect of self-assembled dipole molecules (SADMs) on ZnO surface in hybrid organic-inorganic polymeric light-emitting diodes (HyPLEDs). Despite the SADM being extremely thin, the magnitude and orientation of SADM dipole moment effectively influenced the work function of the ZnO. As a consequence, the charge injection barrier between the conduction band of the ZnO and the lowest unoccupied molecular orbital of poly(9,9(')-dioctylfluorene)-co-benzothiadiazole could be efficiently controlled resulting that electron injection efficiency is remarkably enhanced. The HyPLEDs modified with a negative dipolar SADM exhibited enhanced device performances, which correspond to approximately a fourfold compared to those of unmodified HyPLEDs.open442
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