Sensitizing Dye

Sensitizing Dye


(or optical sensitizer, spectral sensitizer). An organic dye that, when adsorbed to the surface of the silver halide crystals of a photographic emulsion, makes the dyed crystals sensitive to light in the green, red, or infrared regions of the spectrum. A nonsensitized silver halide is not sensitive to such light.

Most sensitizing dyes are polymethine dyes. The molecules of the dye typically contain heterocyclic rings and a conjugated polymethine chain:

where n = 0, 1, 2, 3. The chemical nature of the heterocyclic rings and the length of the polymethine chain determine the dye’s region of spectral absorption, the dye’s region of sensitization, and the efficiency of the sensitizing action.


Kogan, I. M. Khimiia krasitelei, 3rd ed. Moscow, 1956.
References in periodicals archive ?
DX is a sensitizing dye for dye sensitized solar cells developed by a team including Hiroshi Segawa Professor of Research Center for Advanced Science and Technology at the University of Tokyo, who is a key researchers in the Cabinet Office's Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST), and is a next-generation sensitizing dye able to efficiently absorb and perform photoelectric conversion of near infrared light(*1) that could not be absorbed by ruthenium sensitizing dyes used in the past.
DX series dyes employ spin inversion excitation (*2) to successfully extend the long-wavelength side of the power generation wavelength range by around 200 nanometers compared to existing sensitizing dyes.
Photopolymers are made up of a photopolymerization initiator, sensitizing dye and one or more polymerizable monomers in a polymer matrix which acts as a support.
The upper cell consists of a red sensitizing dye that absorbs visible light.
A new sensitizing dye has been used to reduce dye stain and enhance the film's contrast.