Open AccessCarrier injection process of polymer light-emitting diodes
Author(s) -
Wenbo Huang,
Junbiao Peng
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.56.2974
Subject(s) - materials science , diode , optoelectronics , poly(p phenylene vinylene) , ohmic contact , cathode , capacitance , dielectric spectroscopy , pedot:pss , light emitting diode , polymer , electron , charge carrier , electrode , oled , electroluminescence , space charge , layer (electronics) , analytical chemistry (journal) , nanotechnology , composite material , chemistry , physics , quantum mechanics , chromatography , electrochemistry
The carrier injection process of polymer light-emitting diodes (PLEDs) with MEH-PPV(poly2-methoxy5-(2-ethylhexoxy)-14-phenylene vinylene) as the light-emitting layer, was investigated using impedance spectroscopy, capacitance-voltage (C-V) and capacitance-frequency (C-F) techniques. The diodes have the configuration of ITO/PEDOT/MEH-PPV/Ba/Al. The experiments showed that there is an ohmic contact between electrodes and MEH-PPV, and holes and electrons injected from the cathodes are unbalanced. Charged traps in the MEH-PPV result in space-charge under positive bias, and the trap concentration was estimated at about 3.75×1016cm-3.