Photoconductivity of crystals of anthracene doped with tetracene and acridine

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Abstract
A study was made of the photoconductivity of anthracene crystals containing small amounts of tetracene and acridine in the crystal lattice and with aqueous solutions as the electrode material. Doping of anthracene with tetracene markedly reduced the photoconductivity but increased the variation of the photocurrent with the wavelength of the exciting light. The photoconductivity spectrum of heavily doped crystals accurately duplicated the absorption spectrum of anthracene. The theory according to which charge carriers in anthracene are generated only at the positive crystal‐water interface and the role of tetracene as a trap for excitation energy in anthracene can adequately explain the effects of tetracene on the photoconductivity. The effects of acridine on the photoconductivity of anthracene were opposite to those of tetracene. In order to understand the latter results another or an additional mechanism for the generation of charge carriers must be assumed to exist in the crystals doped with acridine.

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