Characterization of the Photoexcitations in Pyridine Based Polymers
Abstract
We discuss the nature of the photoexcitations in poly(p-pyridyl vinylene) (PPyV), derivatized copolymers of PPyV and poly(p-phenylene vinylene) (PPyVPV) and related pyridine-based polymers on the ms time scale. For PPyVPV, the following side groups at the 2 and 5 positions of the phenylene ring are used: R1 = C_12H_25, R2 = COOC_12H_25 and R3 = OC_16H_33. We discuss the effects of the side groups on exciton formation and development as they are applied to millisecond photoinduced absorption (ms PA). In addition, we present X-band PLDMR studies. For excitation energies of greater than 2.54 eV, polaron resonances are present near g = 2.00 in powders and films of PPyV. Triplet exciton powder patterns and half field signals are recorded for both powder and film forms. A smaller triplet exciton signal is observed for films as opposed to powders consistent with enhanced triplet exciton production in powders in accord with ms photoinduced absorption experiments.^1 ^1 S. W. Jessen et al., submitted for publication. This work was supported in part by the Office of Naval Research.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 1996
- Bibcode:
- 1996APS..MAR.K2307J