Silver halide light sensitive emulsion layer having enhanced photographic sensitivity

US6306570A · kind A · utility

Assignee

• EASTMAN KODAK COMPANY · US

Inventors

• Anthony Adin · Rochester, US
• Jerome J. Looker · Rochester, US
• Samir Y. Farid · Rochester, US
• Ian R. Gould · Pittsford, US
• Stephen A. Godleski · Fairport, US
• Jerome R. Lenhard · Fairport, US
• Annabel A. Muenter · Rochester, US
• Lal C. Vishwakarma · Rochester, US
• Paul A. Zielinski · Rochester, US

Key dates

• Filing date: Mar 27, 2000
• Grant date: Oct 23, 2001
• Expiry date: Mar 27, 2020

Classification

• Technology area (CPC G): Physics
• CPC primary: G03C2200/24
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A photographic element comprising at least one silver halide emulsion layer in which the silver halide is sensitized with a compound of the formula: ##STR1## wherein A is a silver halide adsorptive group that contains at least one atom of N, S, Se, or Te that promotes adsorption to silver halide, and Z is a light absorbing group including for example cyanine dyes, complex cyanine dyes, merocyanine dyes, complex merocyanine dyes, homopolar cyanine dyes, styryl dyes, oxonol dyes, hemioxonol dyes, and hemicyanine dyes, and XY is an fragmentable electron donor moiety in which X is an electron donor group and Y is a leaving group other than hydrogen, and wherein: PA1 1) XY has an oxidation potential between 0 and about 1.4 V; and PA1 2) the oxidized form of XY undergoes a bond cleavage reaction to give the radical X.sup..cndot. and the leaving fragment Y. In a preferred embodiment of the invention, the radical X.sup..cndot. has an oxidation potential .ltoreq.-0.7 V.