Carrier injection process of polymer light-emitting diodes

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Abstract
The carrier injection process of polymer light-emitting diodes (PLEDs) with MEH-PPV(poly［2-methoxy，5-(2-ethylhexoxy)-1，4-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.

Keywords:
polymer light-emitting diodes (PLEDs) /

impedance spectroscopy /

cole-cole figure /

carrier injection
Authors and contacts
Huang Wen-Bo¹,

Peng Jun-Biao²

(1)华南理工大学高分子光电材料及器件研究所，广州 510640; (2)华南理工大学高分子光电材料及器件研究所，广州 510640；华南理工大学特种功能材料及其制备新技术教育部重点实验室，广州 510640
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