Effects of Magnetic Fields on the Mutual Annihilation of Triplet Excitons in Anthracene Crystals

Enhanced external quantum efficiency in an organic photovoltaic cell via singlet fission exciton sensitizer

“…6,9 The increase in fluorescence is due to the rate of singlet fission decreasing under high magnetic fields (H > 0.2 T) allowing for singlet exciton processes such as fluorescence to compete more efficiently with fission. 10 The measured changes in fluorescence of the co-deposited film are consistent with those of neat rubrene (k ¼ 500 nm) [ Fig. 2(b)].…”

Microscopic modeling of magnetic-field effects on charge transport in organic semiconductors

“…13,14 This equation was first introduced by Scully and Lamb and is often referred to as the stochastic Liouville equation: 14…”

“…34,35 However, most of the calculations on triplet reactions in the literature are focused on single crystals. 13,33,36 We will use the stochastic Liouville equation to study the magnetic-field-dependence of triplet reactions in disordered organic semiconductors. We will discuss the two most important magnetic-field-dependent reactions involving triplet excitons, namely triplet-triplet (T-T) annihilation and triplet-charge reactions.…”

“…More calculations on this reaction have been reported in the literature. 13,45 The typical Hamiltonian of a molecular T-T pair is…”

Magnetic field dependence of singlet fission in solutions of diphenyl tetracene

“…The random orientation of the collision changes the lineshape of the magnetic field effect compared to the lineshape of molecules in the solid state. This can be understood within the Merrifield model of the magnetic field effects of singlet fission [5,6,16,17]. The distribution of singlet character over the nine triplet pair (TT) spin eigenstates determines the magnetic field effect and its line shape; the more eigenstates with singlet character and the more even the distribution of singlet character, the greater the fission or triplet-triplet annihilation rate.…”