Colloidal cobalt-doped ZnO nanoparticles by microwave-assisted synthesis and their utilization in thin composite layers with MEH-PPV as an electroluminescent material for polymer light emitting diodes

CoxZn1-xO (x = 0.01, 0.05 and 0.1) nanoparticles were prepared by microwave-assisted polyol method from zinc acetate dihydrate and Co(II) acetylacetonate. The reactions were performed in diethylene glycol (DEG) at 250 °C with the use of oleic acid as a surfactant. Resulting nanoparticle (ca. 10 nm)...

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Bibliographic Details
Published in:Organic electronics 2018-08, Vol.59 (C), p.337-348
Main Authors: Skoda, David, Urbanek, Pavel, Sevcik, Jakub, Munster, Lukas, Nadazdy, Vojtech, Cullen, David A., Bazant, Pavel, Antos, Jan, Kuritka, Ivo
Format: Article
Language:English
Subjects:
Cobalt-doped zinc oxide
Colloidal nanoparticles
MATERIALS SCIENCE
MEH-PPV polymer
Microwave synthesis
Optoelectronics
Polymer light emitting diodes
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Summary:CoxZn1-xO (x = 0.01, 0.05 and 0.1) nanoparticles were prepared by microwave-assisted polyol method from zinc acetate dihydrate and Co(II) acetylacetonate. The reactions were performed in diethylene glycol (DEG) at 250 °C with the use of oleic acid as a surfactant. Resulting nanoparticle (ca. 10 nm) precipitates were washed with methanol and dried or kept as colloidal solutions redispersed in toluene. Colloidal solutions were mixed with the Poly [2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) polymer to produce thin nanocomposite layers with specific optoelectronic properties. The electronic structure in terms of density of states (DOS) of MEH-PPV and MEH-PPV/nanocomposite layers was investigated by recently proposed energy resolved electrochemical impedance spectroscopy method. The MEH-PPV polymer and its nanocomposites with ZnO or CoxZn1-xO nanoparticles were used as thin active layers in polymer light emitting diodes (PLED). The nanocomposite layers exhibited optoelectronic properties which were found to be beneficial as the active layer in PLEDs, exhibiting an order of magnitude enhancement in electroluminescence intensity. A pronounced effect on the opening bias voltage of final devices with CoxZn1-xO nanoparticles was also observed. [Display omitted] •Original facile microwave-assisted synthesis of CoxZn1-xO nanocolloids is reported.•Solution of MEH-PPV polymer and CoxZn1-xO nanodispersions mix without precipitation.•MEH-PPV/CoxZn1-xO composite layers electronic structure mapping by ER-EIS technique.•PLEDs with MEH-PPV/CoxZn1-xO nanocomposite active layer were successfully prepared.•The PLEDs with MEH-PPV/CoxZn1-xO layer exhibited lowering of opening bias voltage.
ISSN:1566-1199
1878-5530
DOI:10.1016/j.orgel.2018.05.037