Single molecule polarization spectroscopy: pentacene in p-terphenyl Original Research Article

Polarized light spectroscopy has been performed on single pentacene molecules in p-terphenyl single crystals. Thin crystal flakes of p-terphenyl doped with a very low concentration of pentacene have been grown by sublimation. The orientation of the transition dipole moment of the pentacene molecules in the a′b′-plane of the crystal was determined by taking the birefringence of the crystalline matrix into account. An assignment of the pentacene sites O1, O2, O3 and O4 to the crystallographic position M1, M2, M3 and M4 of the p-terphenyl triclinic unit cell is proposed.