Photo-induced and thermal processes in fullerene solutions

I. V. Bagrov; I. M. Belousova; O. B. Danilov; V. M. Kiselev; T. D. Murav'eva; E. N. Sosnov

doi:10.1117/12.739361

10 April 2007 Photo-induced and thermal processes in fullerene solutions

I. V. Bagrov, I. M. Belousova, O. B. Danilov, V. M. Kiselev, T. D. Murav'eva, E. N. Sosnov

Proceedings Volume 6613, Laser Optics 2006: Wavefront Transformation and Laser Beam Control; 66130A (2007) https://doi.org/10.1117/12.739361
Event: Laser Optics 2006, 2006, St. Petersburg, Russian Federation

Abstract

The experimental investigations of photo-induced quenching of singlet oxygen luminescence in fullerene solutions (C₆₀ and C₇₀ in CCI₄) at optical pumping have shown presence of dependence of ¹g&Dgr;g 0₂ lifetime in a solution on initial fullerene concentration, optical pumping intensity and temperature of the solution. The increase of any of these three factors results in the reduction of the singlet oxygen lifetime in the solution, and for C₇₀ these effects are much stronger than for C₆₀. It is shown that at pulse optical excitation the solution C₆₀ is stable and restores the properties some time after the influence. These effects can not be explained by only thermal mechanism, the major part is played by process of formation of fullerene-oxygen complexes which as a quencher for the state ¹Δg 0₂. These complexes are unstable and are decomposed later into initial components. The initial fullerene C₆₀ concentration is completely restored in the solution. The initial fullerene C₇₀ concentration is partly restored in the solution. All these conclusions are based on the results of the study of absorption spectra of fullerene solutions before and some time after the influence on solutions of pulse optical excitation. For CW irradiation, the effects of photoinduced quenching of singlet oxygen luminescence in fullerene solutions have been studied as well. These phenomena are to be considered when developing a generators of singlet oxygen for fullerene-oxygen-iodine laser. The temperature of solution also plays an important role in the development of singlet oxygen generators. To increase the generator efficiency it is necessary to cool the solution efficiently.

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I. V. Bagrov, I. M. Belousova, O. B. Danilov, V. M. Kiselev, T. D. Murav'eva, and E. N. Sosnov "Photo-induced and thermal processes in fullerene solutions", Proc. SPIE 6613, Laser Optics 2006: Wavefront Transformation and Laser Beam Control, 66130A (10 April 2007); https://doi.org/10.1117/12.739361

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KEYWORDS

Oxygen

Fullerenes

Luminescence

Absorption

Molecules

Lamps

Optical pumping

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