Dye-sensitized light-sensitive core/shell silver halide photographic material

Claim 1

A light-sensitive silver halide color photographic material having at least one silver halide emulsion layer on a support, characterized in that said silver halide emulsion layer includes substantially monodispersed non-tabular silver halide grains having a configuration of octahedral or tetradecahedral; said silver halide grains are core/shell type silver halide grains in which a silver iodide content is higher in core portions than in shell portions, said silver halide grains having regular grain sizes, and having a grain size distribution as defined by the following formula: ##EQU3## wherein S represents the standard deviation; r represents the average grain size; r i represents individual grain sizes; and n i represents numbers of r i ; provided that the r is defined by the following formula: ##EQU4## wherein n i and r i have the same meanings as defined above, said core portion of the silver halide grains comprising silver iodide at a level of 2 to 15 mole %; and said shell portion of the silver halide grains comprising silver iodide at a level of 0 to 4 mole %; and said silver halide grains are those which have been sensitized with a combination of at least one of sensitizing dyes represented by the following general formula (I) and at least one of sensitizing dyes represented by the following general formula (II): ##STR7## wherein Y 1 , Y 2 , Y 3 and Y 4 each represent a hydrogen atom, halogen atom, hydroxyl group, alkoxy group, amino group, acylamido group, acyloxy group, alkoxycarbonyl group, alkoxycarbonylamino group, aryl group, cyano group or alkyl group, at least one of (i) Y 1 and Y 2 , and (ii) Y 3 and Y 4 may be coupled to each other to form a ring or to form a naphthoxazole ring; R 1 represents a hydrogen atom or an alkyl group; R 2 and R 3 each represent an alkyl group; X 1 .sup.⊖ represents an anion; and m is an integer of 1 or 2, provided that when the m is 1, the R 2 or R 3 is a residue formable of an internal salt; ##STR8## wherein Y 5 , Y 6 , Y 7 and Y 8 each represent a hydrogen atom, halogen atom, hydroxyl group, alkoxy group, amino group, acylamido group, acyloxy group, alkoxycarbonyl group, alkoxycarbonylamino group, aryl group, cyano group or alkyl group, at least one of (i) Y 5 and Y 6 , and (ii) Y 7 and Y 8 may be coupled to each other to form a ring or to form a naphthodiazole ring; R 4 represents a hydrogen atom or alkyl group; R 5 , R 6 , R 7 and R 8 each represent an alkyl group; X 2 .sup.⊖ represents an anion; and n is an integer of 1 or 2, provided that when the n is 1, R 5 , R 6 , R 7 or R 8 is a residue formable of an internal salt.