Pressure dependence of the luminescence and Raman modes in polyfluorene

I present a study of the optical properties of poly-para-phenylene and three different side-chain substituted polyfluorene polymers. I present an analysis of the Raman spectra under hydrostatic pressures for three oligo(para-phenylene) materials (p-terphenyl, 3P; p-quaterphenyl, 4P; and p-hexaphenyl, 6P) under hydrostatic pressure up to 80 kbar, with a focus on the 15-25 kbar region where the molecules are known to be forced into a more planar state. I present studies of the photoluminescence (PL) and Raman modes of polyfluorene (PF2/6) under hydrostatic pressures of 0-120 kbar at room temperature. The distinct PL with associated vibronics observed at atmospheric pressure blue shifts and changes dramatically around 20 kbar, above this pressure a broad peak at about 2.3 eV, associated with the keto defect, begins to dominate the PL. Raman modes observed are the 1417 cm-1 mode from the C-C stretch within the monomer, the 1342 cm-1 and 1290 cm-1 modes from phenyl rings connecting the monomer units, and the 1600 cm-1 modes from the intra-ring C-C stretch. All Raman modes analyzed shift to higher energies with pressure. Some of the phonon lines exhibit an antiresonance effect at higher pressures that is indicative of a high electron phonon interaction between the Raman phonons and the (real) PL transitions.

Name thesis:degree_name

Ph. D.

Level thesis:degree_level

Doctoral

Discipline thesis:degree_discipline

Physics and astronomy (MU)

Grantor dc:publisher

University of Missouri--Columbia

Year dc:date.issued

2005

Author dc:creator

• Martin, Christopher M., 1973-

Advisor dc:contributor.advisor

• Chandrasekhar, Holalkere R.

• poly-para-phenylene ;p-terphenyl 3P;p-quaterphenyl, 4P;p-hexaphenyl, 6P.
• poly-para-phenylene ;p-terphenyl 3P;p-quaterphenyl, 4P;p-hexaphenyl, 6P

Statement dc:rights

• OpenAccess.

Language dc:language.iso

eng, English

DOI

https://doi.org/10.32469/10355/4425

OAI identifier oai:identifier

oai:mospace.umsystem.edu:10355/4425