Impedance spectroscopy of single- and double-layer polymer light-emitting diode

Impedance spectroscopy of single- and double-layer polymer light-emitting diode

ac electrical properties of the heterostructured polymer light-emitting diode consisting of poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylenevinylene] (MEH–PPV) and sodium sulfonated polystyrene (SSPS) ionomer are studied. It is found that the carrier in SSPS is not the ion but the electron, and th...

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Veröffentlicht in:Journal of applied physics 2000-01, Vol.87 (2), p.882-888
Hauptverfasser: Kim, Seong Hyun, Choi, Kang-Hoon, Lee, Hyang-Mok, Hwang, Do-Hoon, Do, Lee-Mi, Chu, Hye Yong, Zyung, Taehyoung
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container_end_page 888
container_issue 2
container_start_page 882
container_title Journal of applied physics
container_volume 87
creator Kim, Seong Hyun
Choi, Kang-Hoon
Lee, Hyang-Mok
Hwang, Do-Hoon
Do, Lee-Mi
Chu, Hye Yong
Zyung, Taehyoung
description ac electrical properties of the heterostructured polymer light-emitting diode consisting of poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylenevinylene] (MEH–PPV) and sodium sulfonated polystyrene (SSPS) ionomer are studied. It is found that the carrier in SSPS is not the ion but the electron, and the conduction mechanism seems to be a space-charge limited current with exponential trap distribution. Based on the results of the impedance analysis, we propose a microscopic model to explain the enhancement of the electroluminescence efficiency of the indium tin oxide/MEH–PPV/SSPS/Al structure.
doi_str_mv 10.1063/1.371956
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title Impedance spectroscopy of single- and double-layer polymer light-emitting diode
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