Hexathiophene single crystals: luminescence and magnetic resonance
15 March 2001
We employed the absorption and photoluminescence (PL) spectroscopies, PL excitation dependence and PL-detected magnetic resonance (PLDMR), to study the steady state photophysics of ultrapure cr-GT single crystals. Whereas the lowest lying absorption band has only very little oscillator strength, nevertheless we found strong PL emission. From this and the symbatic PL excitation spectrum we conjecture that the PL emission is intrinsic. The PLDMR spectra show several discrete lines showing the contributions of two similar triplets located at two different crystal locations.