Transition metal complex with nitrosyl ligand dopant and iridium dopant combinations in silver halide
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United States of America Patent
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Dec 13, 1994
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N/A
app pub date -
Mar 12, 1993
filing date -
Mar 22, 1991
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Expired
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Abstract
The invention is generally accomplished by providing a halide emulsion comprising radiation sensitive silver halide doped with a combination of iridium and transition metal complex with a nitrosyl ligand. The method of doping comprises one in which the transition metal complex with a nitrosyl ligand is generally evenly distributed throughout the grain and the iridium is present in about the outer 10 percent, by volume, of said grain. In a preferred form, the transition metal complex with a nitrosyl ligand is present in an amount between about 0.03 and about 36 molar parts per billion, and the iridium is present in an amount of between about 10 and about 350 molar parts per billion.
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