Triplet exciton dynamics in conjugated polymer films

A thorough knowledge of the excited state dynamics in conjugated polymers is necessary for efficient use of these novel materials. Triplet excitons are believed to play an important role in conjugated polymer-based device operation. Triplet excitons are also believed to play a primary role in photo-oxidative degredation of polymer devices. Two-photon photoemission is used to probe triplet exciton relaxation dynamics in pristine conjugated polymer films and triplet-triple annihilation is determined to be an important deexcitation mechanism. Controlled photo-oxidation of conjugated polymer films is studied using two-photon photoemission. The triplet exciton-derived photoemission peak is observed to shift and narrow dramatically upon photo-oxidation. The peak narrowing is attributed to narrowing of the distribution of polymer conjugation lengths in the film. The peak shift is attributed to formation of defects at the ends of the polymer chains which change the average triplet exciton energy.

Name thesis:degree_name

Master of Science

Level thesis:degree_level

Masters

Discipline thesis:degree_discipline

Engineering

Grantor

Rice University

Year dc:date.issued

1997

Author dc:creator

• Hale, Gregory D.

Advisor dc:contributor.advisor

• Halas, Naomi J.

• Polymer chemistry
• Condensed matter physics
• Optics

Statement dc:rights

• Copyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.

Language dc:language.iso

eng

Handle dc:identifier.uri

https://hdl.handle.net/1911/17091

OAI identifier oai:identifier

oai:repository.rice.edu:1911/17091