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http://dx.doi.org/10.7317/pk.2012.36.4.519

Electron Injection Mechanisms Varied by Conjugated Polyelectrolyte Electron Transporting Layers in Polymer Light-Emitting Diodes  

Um, Seung-Soo (School of Chemical Engineering and Materials Science, Chung-Ang University)
Park, Ju-Hyun (School of Chemical Engineering and Materials Science, Chung-Ang University)
Publication Information
Polymer(Korea) / v.36, no.4, 2012 , pp. 519-524 More about this Journal
Abstract
Capacitance measurements of the polymer light-emitting diodes (PLEDs) with conjugated polyelectrolyte (CPE) electron transporting layers (ETLs) provide important information of device physics for understanding the function of CPEs as ETLs, together with current density-voltage-luminescence measurements. We investigated the counterion-dependent capacitance behaviors that present a highly negative or positive capacitance at the low frequency, and suggested different carrier injection mechanisms. Capacitance model study reveals that the electron injection mechanism can be described either by the dipole alignment scheme or by electronic charge carrier accumulation at the cathode/ETL/emission layer interfaces.
Keywords
conjugated polyelectrolyte; polymer light-emitting diode; electron injection; device capacitance;
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