I'll have to get that reference. The reason I mention it is that the laser dyes and other things such as quantum dots (that work like dyes) and my own work with tuned to length centrosymmetric molecules (like carbon nanotubes in the 300-1000nm length range) would seem to offer a possible new set of useful sensitizing materials. The PV solar industry uses sensitizing dyes to move toward the red, for instance, and the dyes have to be lightfast and reasonably priced.