Photographic material having enhanced light absorption

US6361932B1 · kind B1 · utility

Assignee

• EASTMAN KODAK COMPANY · US

Inventors

• Richard L. Parton · Webster, US
• Thomas L. Penner · Fairport, US
• William James Harrison · Temecula, US
• Margaret J. Helber · Webster, US

Key dates

• Filing date: Sep 11, 1998
• Grant date: Mar 26, 2002
• Expiry date: Sep 11, 2018

Classification

• Technology area (CPC G): Physics
• CPC primary: G03C1/29
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

This invention comprises a silver halide photographic material comprising at least one silver halide emulsion comprising silver halide grains having associated therewith at least two dye layers comprising(a) an inner dye layer adjacent to the silver halide grain and comprising at least one dye, Dye 1, that is capable of spectrally sensitizing silver halide and(b) an outer dye layer adjacent to the inner dye layer and comprising at least one dye, Dye 2, wherein Dye 2 is other than a cyanine dye, wherein the dye layers are held together by non-covalent forces; the outer dye layer adsorbs light at equal or higher energy than the inner dye layer; and the energy emission wavelength of the outer dye layer overlaps with the energy absorption wavelength of the inner dye layer.This invention also comprises a silver halide photographic material comprising at least one silver halide emulsion comprising silver halide grains having associated therewith at least one dye having at least one anionic substituent and at least one dye having at least one cationic substituent, with the proviso that one of the dyes is other than a cyanine dye.