Lightfast properties of azo and polycyclic aromatic imaging dyes

James Vernille; Scott Williams

doi:10.1117/12.304576

1 April 1998 Lightfast properties of azo and polycyclic aromatic imaging dyes

James Vernille, Scott Williams

Proceedings Volume 3302, Digital Solid State Cameras: Designs and Applications; (1998) https://doi.org/10.1117/12.304576
Event: Photonics West '98 Electronic Imaging, 1998, San Jose, CA, United States

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.

Citation Download Citation

James Vernille and Scott Williams "Lightfast properties of azo and polycyclic aromatic imaging dyes", Proc. SPIE 3302, Digital Solid State Cameras: Designs and Applications, (1 April 1998); https://doi.org/10.1117/12.304576

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KEYWORDS

Rhodamine

Luminescence

Absorbance

Absorption

Polymers

Energy transfer

Carbon

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