Here are some recent resources I've found regarding spectral sensitizing, from the holography folks.
Apparently these are sensitizing dyes as well. Possibly very expensive(?, not sure...)
Very interesting opportunity to get pinacyanol chloride
via Jeff Blyth
And haven't even read this, but it looks interesting...
The Action of Optical Sensitizers on the Photographic Plate, G. Kornfeld. Kodak Research Laboratories, Rochester, New York. Received May 25, 1938.