Department of Physics, Engineering Physics & Astronomy

Queen's University
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Department of Physics, Engineering Physics & Astronomy
Department of Physics, Engineering Physics & Astronomy

CMP Seminar-  MEH-PPV Photophysics

Jon White,
Dept. of Photonics Engineering, Yuan Ze University, Taoyuan, Taiwan

 

Thursday, February 5th, 2015
10:30 am @ Stirling 401

Abstract:

Conjugated polymers are unique subjects composed of many excitons localized at individual segments. Migration of excitation is strongly correlated with the chain conformation. Poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene], or MEH-PPV, is widely regarded as a prototypical light emitting conjugated polymer. In this talk we hope to start by discussing our single molecule studies on the relation between the conformation of, and exciton migration in, single isolated polymers making use of photo-quenching of individual conjugated segments to provide information on the exciton migration process. Moving on from the phenomenological model obtained, we will discuss the effects of stress, and of a nearby quencher (graphene) on the observed photophysics and chain conformations. Finally we will discuss our preliminary work on the effects of a nearby quencher (graphene) on these photophysics.