Magnetic field-induced polarization inversion in delayed fluorescence

It is shown that a recent theory for the magnetic field dependence of delayed fluorescence radiation of aromatic hydrocarbons in liquid solutions leads to the theoretical prediction of a new effect according to which the polarized intensity branches of the relative field effect exhibit a crossover at a certain magnetic field H_c. As a general feature, the branch polarized parallel to the external field H lies above the branch polarized perpendicularly for H < H_c whereas this order is reversed for H >H_c. The magnitude of the polarization splitting may become quite large at sufficiently low temperatures and will easily be measurable experimentally, particularly at higher fields.