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Photoconductivity and Fading
Author(s) -
HORTON F. J.,
PATTERSON D.,
RIZZO F. J.
Publication year - 1976
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1976.tb03292.x
Subject(s) - photoconductivity , semiconductor , optoelectronics , materials science , conductivity , thermal conduction , radiation , photochemistry , chemistry , optics , physics , composite material
The conductivity of purified films of the eight dyes used in the ISO Light‐fastness Test have been studied both in the dark and under illumination by the visible and ultra‐violet radiation from a mercury vapour lamp. All eight dyes behaved as n‐type semiconductors and additionally those of light fastness ratings five and above showed p‐type semiconduction. All the dyes also behaved as photoconductors and the activation energies of photoconduction were between one third and one fifth of those for semiconduction. Very rapid response to illumination was shown by the dyes of highest light fastness. Although the dyes were of five different chemical types, some tentative rules relating properties to light fastness can be formulated. These are: (1) Dyes should show p‐type and n‐type semicon‐ductivity. (2) Response time of photo‐conduction should be short. (3) In the case of dyes of similar structure, higher activation energies for photoconduction favour higher light fastness.