Open AccessDynamic electrical characteristics of organic light-emitting diodes
Author(s) -
Zhang Xiu-Long,
Yang Sheng-Yi,
Lou Zhidong,
Yanbing Hou
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.56.1632
Subject(s) - equivalent series resistance , materials science , dielectric spectroscopy , equivalent circuit , thermal conduction , capacitance , diode , relaxation (psychology) , charge carrier , dielectric , optoelectronics , electrical impedance , voltage , analytical chemistry (journal) , chemistry , electrical engineering , composite material , electrode , psychology , social psychology , chromatography , electrochemistry , engineering
The charge carriers conduction mechanism of single-layer device ITO/Alq3(90 nm)/Al has been studied by impedance spectroscopy. According to the frequency-dependent response and its equivalent circuit modelthe device can be interpreted in terms of the equivalent circuit model of a contact resistance Rs in series with a parallel combination of a capacitance Cp and a resistance Rp, and the values of Rp, Cp and Rs can be found from experimental data. Our experimental results confirmed that the charge carriers conduction mechanism of ITO/Alq3(90 nm)/Al is trap-charge limited current with exponential distribution, and the dielectric relaxation time of the material decreases dramatically with increasing applied bias voltages.