Journal
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
Volume 232, Issue -, Pages 22-32Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.mseb.2018.10.013
Keywords
Zinc oxide; Nanoparticles; Microwave; Colloid; Nanocomposite; Polymer MEH-PPV; Optoelectronics; PLED
Funding
- Ministry of Education, Youth and Sports of the Czech Republic - Program NPU I [L01504]
- Internal Grant Agency of Tomas Bata University in Zlin [IGA/CPS/2016/007, IGA/CPS/2017/008]
- Operational Program Research and Development for Innovations - European Regional Development Fund (ERDF)
- national budget of Czech Republic within the project CPS - strengthening research capacity [CZ.1.05/2.1.00/19.0409]
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Zinc oxide nanoparticles were synthesized via microwave-assisted reactions from a zinc acetate dihydrate. The reactions were performed in diethylene glycol (DEG) at 220 degrees C and 250 degrees C while using oleic acid as the surfactant. The ZnO precipitates obtained were washed with methanol and dried or kept as colloidal solutions redispersed in toluene. The size of the nanoparticles ranged from ca. 5 to 12 nm and they could be modified by the concentration of Zn precursor. Different morphologies due to the function of oleic acid concentration were observed. The resulting ZnO nanocolloids were mixed with the poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) polymer to obtain MEH-PPV/ZnO nanocomposites. The nanocomposite layers exhibited optoelectronic properties which were found to be beneficial for being applied as the active layer in the polymer light emitting diodes. The intensity of the electroluminescence of the prepared PLED devices was enhanced by one order of magnitude keeping all other parameters constant and powered as the same operation voltage. As additional step the effect of active layer thickness on optoelectronic performance of PLED devices was investigated as well.
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