Determination of Charge-Carrier Mobility in Organic Light-Emitting Diodes by Impedance Spectroscopy in Presence of Localized States

被引：59

作者：

Okachi, Takayuki ^{[1
]}

Nagase, Takashi ^{[1
,2
]}

Kobayashi, Takashi ^{[1
,2
]}

Naito, Hiroyoshi ^{[1
,2
]}

机构：

[1] Osaka Prefecture Univ, Dept Phys & Elect, Sakai, Osaka 5998531, Japan

[2] Osaka Prefecture Univ, Res Inst Mol Elect Devices, Sakai, Osaka 5998531, Japan

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS | 2008年 / 47卷 / 12期

基金：

日本学术振兴会;

关键词：

organic light-emitting diodes; impedance spectroscopy; charge-carrier mobility; localized-state distributions; LUMATION (TM);

D O I：

10.1143/JJAP.47.8965

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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 LUMATION (TM) (Sumation (TM)) Green 1300 Series light-emitting polymers.

引用

页码：8965 / 8972

页数：8

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