Effect of temperature and pressure on the optical properties of polyfluorene

We present photoluminescence (PL) and Raman scattering studies from polyfluorene as a function of hydrostatic pressure and temperature. The PL backbone emission blue shifts and changes dramatically around 20 kbar becoming primarily a single peak. This is related to the emission from keto defects in the sample. The Raman modes shift to higher energies and exhibit unexpected antiresonance lineshapes at higher pressures, indicating a strong electron-phonon interaction.