Abstract
Photocarrier generation in an anthracene single crystal has been measured as a function of electric field up to 1.8 × 10 7 V/m. Charge carriers are generated homogeneously in the crystal by photoionization of singlet excitons. At low fields the apparent carrier yield increases linearly with the field, whereas at high fields the increase becomes sublinear. Comparing the data with the Onsager theory (in a form given by Mozunder, J. Chem. Phys. 60 (1974) 4300) the generation efficiency and the initial separation of an electron and a hole could be estimated. It has been found that the generation efficiency of the “geminate pair” increases drastically as the energy of the optically excited state increases from 5.1 to 6.1 eV.
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