Patent ID: 6342341
Filing Date: 2002-01-29
Classification: G03C

Abstract:
A silver halide photographic element comprising at least one radiation sensitive silver halide emulsion layer comprising tabular silver halide grains that have been epitaxially sensitized by epitaxially grown silver halide comprising a mixture of silver iodide silver chloride, and silver bromide, and further comprising a transition metal dopant, and a fragmentable electron donor compound of the formula Xâ€”Yâ€² or a compound which contains a moiety of the formula â€”Xâ€”Yâ€²;whereinX is an electron donor, Yâ€² is a leaving proton H or a leaving group, with the proviso that if Yâ€² is a proton, a base &bgr;â€², is covalently linked directly or indirectly to X, and wherein: 1) Xâ€”Yâ€² has an oxidation potential between 0 and about 1.4 V; and 2) the oxidized form of Xâ€”Yâ€² undergoes a bond cleavage reaction to give the radical Xâ€¢ and the leaving fragment Yâ€²; and, optionally, 3) the radical Xâ€¢ has an oxidation potential&lE;about âˆ’0.7 (that is, equal to or more negative than about âˆ’0.7V).