Journal
JOURNAL OF MACROMOLECULAR SCIENCE PART B-PHYSICS
Volume 59, Issue 6, Pages 366-375Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/00222348.2020.1728897
Keywords
Triplet excitons; triplet-triplet annihilation; conjugated polymer nanoparticles; molecular oxygen; poly[2-methoxy-5-(2-ethylhexyloxy)-1; 4-phenylenevinylene]
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Funding
- Ministry of Education and Science of the Russian Federation [3.7758.2017/BP]
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In this work the magnetic field effects (MFE) on the photoluminescence of MEH-PPV film and nanoparticles were obtained using the MFE technique with continuous-wave photoexcitation. The analysis of the MFE dependence for the MEH-PPV film gave a HWHM (half-width at half maximum) similar to 65 mT and a total MFE value about 102.8% at 200 mT whereas the MFE dependence of the MEH-PPV nanoparticles showed significant broadening, with their HWHM similar to 280 mT and a total MFE value of 99% at 550 mT. By a simple theoretical model based on rate equations, the mechanism of the negative magnetic field effect was explained. The observed negative effect was the result of the dominant singlet exciton formation rate in the MEH-PPV nanoparticles. For explaining this negative effect the enhanced triplet-triplet annihilation due to confinement of triplet excitons in the nanoparticles and singlet molecular oxygen-triplet exciton annihilation were proposed.
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