Title

Quantum Efficiency Study of Bdmo-Ppv Photo-Degradation Processes in Different Solutions

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Physics and Astronomy

Date of Award

Summer 2020

Abstract

Poly-phenylene vinylenes (PPVs) are organic semiconducting polymers with good opto-electronic properties, but are known for instability and degradation when exposed to oxygen. Poly-2,5-bis(3’,7’-dimethyloctyloxy)-1,4-phenylenevinylene (BDMO-PPV), poly2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene (MEH-PPV), and poly[2- methoxy5-(3’,7’-dimethyloctyloxy)-1,4-phenylenevinylene] (MDMO-PPV) exhibit enhanced quantum yield during continuous illumination and degradation in an oxygen-rich environment. Through variations in absorbance, scattering, reflectance, and transmittance of the PPV solutions as well as various spectroscopic techniques we observe the processes responsible for these increased quantum yields. A proposed highly emissive intermediate photoluminescent state due to a combination of photo-physical and photochemical reactions is responsible for emission enhancement.

Advisor

Heungman Park

Subject Categories

Physical Sciences and Mathematics | Physics

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