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A REVIEW OF THE SPECTRAL SENSITIZATION OF SILVER HALIDES, PAST AND PRESENT *
Author(s) -
GILMAN PAUL B.
Publication year - 1972
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1972.tb06294.x
Subject(s) - silver halide , sensitization , halide , electron , chemistry , ion , photochemistry , ionization , conduction band , trapping , spectral sensitivity , spectral line , materials science , optoelectronics , inorganic chemistry , physics , organic chemistry , quantum mechanics , ecology , layer (electronics) , immunology , biology , wavelength
— Some of the important historical steps leading to our present understanding of the spectral sensitization of silver halides are reviewed and a new modification of the theory of the electron transfer mechanism of spectral sensitization is discussed. It is proposed that it is not necessary for spectral sensitizing dyes to inject electrons directly into the conduction band of the silver halide in the primary step. The only energetic restriction for the primary act of spectral sensitization is suggested to be the simple reduction of surface silver ions. However, for the spectral sensitizing act to be recorded photographically, secondary processes must be favorable for the subsequent deep trapping of the electrons that arise from the ionization of single silver atoms produced from the initial spectral sensitizing act.