The emission properties of crystalline oligothiophenes (OTs) are investigated and related to the different selection rules arising from the number of rings. In odd OT crystals the purely electronic emission is absent since the molecular A(1)-1B(1) transition dipoles cancel at the bottom of the excitonic band. On the contrary, in crystals of even OTs this transition is allowed due to the constructive interference of the off-axis components of the molecular transition dipole. It possesses a polarization in the herringbone plane and exhibits superradiant behavior
Meinardi, F., Cerminara, M., Sassella, A., Borghesi, A., Spearman, P., Bongiovanni, G., et al. (2002). Intrinsic excitonic luminescence in odd and even numbered oligothiophenes. PHYSICAL REVIEW LETTERS, 89(15) [10.1103/PhysRevLett.89.157403].
Intrinsic excitonic luminescence in odd and even numbered oligothiophenes
MEINARDI, FRANCESCO;SASSELLA, ADELE;BORGHESI, ALESSANDRO;TUBINO, RICCARDO
2002
Abstract
The emission properties of crystalline oligothiophenes (OTs) are investigated and related to the different selection rules arising from the number of rings. In odd OT crystals the purely electronic emission is absent since the molecular A(1)-1B(1) transition dipoles cancel at the bottom of the excitonic band. On the contrary, in crystals of even OTs this transition is allowed due to the constructive interference of the off-axis components of the molecular transition dipole. It possesses a polarization in the herringbone plane and exhibits superradiant behavior
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