Photoinjection of holes into anthracene crystals using aqueous I –3 solutions: magnetic field effects

Abstract

The photoinjection efficiency of holes into anthracene by irradiated aqueous I^–₃ electrodes is decreased by the application of an external magnetic field of up to 100 kG. The effect is attributed to the magnetic field enhanced dissociation of electronically excited I₂(I^*₂) in solution. The I^*₂ is proposed as a photodissociation product of excited I^–₃. Atomic iodine does not seem to play a major role in the photoinjection process. The action spectrum is given and a kinetic scheme is proposed. Preliminary results on tetracene, perylene, and dinitronaphthalene show great differences from anthracene.