Investigation of Exciton Dynamics through Optical Anisotropy Measurements of Organic Semiconductor Ensembles

Document Type


Degree Name

Master of Science (MS)


Physics and Astronomy

Date of Award

Spring 2020


Polyphenylene vinylene (PPV) polymer derivatives are popular fluorescing, semiconducting materials used broadly in materials science - most notably as part of OLEDS andphotovoltaics. It is through the conjugation of pi-bond orbital that some segments of thesepolymer chains (chromophores) can absorb and emit light; the fluorescence of these materials isexplained thoroughly by the Theory of Excitons. By adjusting the polarization ofabsorbed/emitted photons for a polymer ensemble, one can know the dipole orientation of theabsorbing/fluorescing chromophores and infer the local nature of energy migration along anarbitrary chain within a film. Similarly, higher concentration films can yield answers to thequestions posed regarding non-localized exciton travel across separate polymers within densefilms. This technique is well founded in single molecule spectroscopy, but in this thesis, a novelapplication is offered: molecular ensemble anisotropy measurements with photoluminescentspectrums resolved by wavelength.


Heungman Park

Subject Categories

Astrophysics and Astronomy | Physical Sciences and Mathematics