Determination of Charge-Carrier Mobility in Organic Light-Emitting Diodes by Impedance Spectroscopy in Presence of Localized States
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概要
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The determination of charge-carrier mobility in organic light-emitting diodes (OLEDs) in the presence of localized states by impedance spectroscopy (IS) measurements is carried out. The influences of localized-state distributions on charge-carrier mobility determination by IS measurements are examined on the basis of a theory for single-injection space-charge-limited current. It is shown that the drift mobilities of OLEDs can be determined by IS measurements even in the presence of localized states. It is also shown that distributed localized states cause low frequency behavior of capacitance (an increase in capacitance with decreasing frequency). Measurements of the characteristic temperatures of conduction- and valence-band tail states are demonstrated in polyfluorene-based LUMATIONTM (SumationTM) Green 1300 Series light-emitting polymers.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2008-12-25
著者
-
Naito Hiroyoshi
Department Of Chemistry And Organosilicon Research Laboratory
-
Nagase Takashi
Department Of Gerontological Nursing/wound Care Management Graduate School Of Medicine The University Of Tokyo
-
KOBAYASHI Takashi
Department of Applied Physics,Faculty of Engineering,Nagoya University
-
Okachi Takayuki
Department of Physics and Electronics, Osaka Prefecture University, Sakai 599-8531, Japan
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