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Proceedings Paper

Lightfast properties of azo and polycyclic aromatic imaging dyes
Author(s): James Vernille; Scott Williams
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Paper Abstract

As an imaging dye absorbs a single photon, there exists a non-zero probability that the dye will bleach as the result of a photochemically induced reaction. Two possible mechanisms, which can cause this photochemical event, are radical formation and/or radiative energy transfer. A photophysical investigation was completed in order to identify a dominate mechanism governing the lightfast properties of imaging inks. Time and spatial domain spectroscopic studies were conducted on an azo class dye, Cibacron Brilliant Red 3B-A, and Rhodamine 6G bound to humic acid - polymer phenol with known radiative and binding characteristics to polyaromatics. Stern-Volmer analysis illustrated that Rhodamine 6G binds strongly to humic acid with a binding constant of approximately 3000 L/g - C, as opposed to, Brilliant Red which binds about 100 times less strongly to the polymer additive. Both dyes were found to bind statically to humic acid. Accelerated photo degradation studies revealed that dye bound to humic acid bleached at a rate proportional to the binding association of each dye. Time resolved fluorescence decay results indicated this bleaching is not the result of polaron or long distance radiative energy transfer. Radical quenching studies suggest that the primary mechanism involves a ground state reaction with a radical intermediate.

Paper Details

Date Published: 1 April 1998
PDF: 8 pages
Proc. SPIE 3302, Digital Solid State Cameras: Designs and Applications, (1 April 1998); doi: 10.1117/12.304576
Show Author Affiliations
James Vernille, Rochester Institute Of Technology (United States)
Scott Williams, Rochester Institute of Technology (United States)

Published in SPIE Proceedings Vol. 3302:
Digital Solid State Cameras: Designs and Applications
George M. Williams Jr., Editor(s)

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