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Pure Appl. Chem., 2001, Vol. 73, No. 3, pp. 455-458

New approach to silver halide photography using radical cation chemistry

I. R. Gould1*, J. R. Lenhard2, A. A. Muenter2, S. A. Godleski2 and S. Farid2

1 Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ 85287-1604, USA
2 Research Laboratories, Eastman Kodak Company, Rochester, NY 14650-2109, USA

Abstract: A new mechanism for spectral sensitization of silver halide is described, which can potentially double the sensitivity of photographic emulsions. The photooxidized sensitizing dye is trapped using an organic donor molecule, which fragments to form a cation and a reducing radical, which injects an electron into the conduction band of the silver halide. In this way, two conduction-band electrons can be produced for each absorbed photon.