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Spectroscopic Determination of Very Low Quantum Yield of Singlet Oxygen Formation Photosensitized by Dyes and Pigments

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We have measured the quantum yield Q Δ of 1Δg molecular oxygen (singlet oxygen, 1O2) formation photosensitized by some dyes for industrial uses, because the photofading processes of dyes are usually triggered by 1O2. Q Δ for industrial dyes, however, is generally very low, and it has been difficult to determine accurately Q Δ for them. We have made a highly sensitive spectrometer for 1.27-μm 1O2 phosphorescence detection, and determined Q Δ for an azo dye as low as (2.2 ± 1.5) × 10−5. This is the first demonstration of Q Δ lower than 10−4 as far as we know. Relationship between Q Δ and the lightfastness of practical dyes is also discussed in this study.

Document Type: Research Article

Publication date: 2001-01-01

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