Fluorescence from upper excited states of porphyrins with one- and two-photon excitation

M. Kruk; M. Drobizhev; A. Karotki; A. Rebane

doi:10.1117/12.752487

9 July 2007 Fluorescence from upper excited states of porphyrins with one- and two-photon excitation

M. Kruk, M. Drobizhev, A. Karotki, A. Rebane

Proceedings Volume 6727, ICONO 2007: Nonlinear Laser Spectroscopy and High-Precision Measurements; and Fundamentals of Laser Chemistry and Biophotonics; 67272F (2007) https://doi.org/10.1117/12.752487
Event: The International Conference on Coherent and Nonlinear Optics, 2007, Minsk, Belarus

Abstract

In this paper we report on the study of S₂→S₀ blue fluorescence and two-photon absorption (TPA) for a series of Zn-tetrabenzoporphyrins (Zn-TBP) with sequential substitution of phenyl groups in meso-positions. The blue fluorescence has been measured with both one- and two-photon excitation. The data on TPA showed that lowest g-parity state lies above B-state for all these compounds and blue fluorescence has been detected upon two-photon excitagtion at g→g transition energies above that of Soret band. The data are in line with the suggested role of the g-parity low-lying state in the nonradiative deactivation of B state. More than two-fold decrease in the relative yield of blue fluorescence was found in going from Zn-monophenyl-TBP to Zn-tetraphenyl-TBP. The enhancement of the radiationless internal S₂→S₁ and S₁→S₀ conversion and the decrease in the quantum yield of blue fluorescence was proposed to explain by nonplanar distortions of tetrapyrrolic macrocycle in Zn-tetraphenyl-TBP. The obtained results indicate that the positioning of g-parity excited states above B states is a requirement but not the sufficient condition for presence of blue fluorescence.

Citation Download Citation

M. Kruk, M. Drobizhev, A. Karotki, and A. Rebane "Fluorescence from upper excited states of porphyrins with one- and two-photon excitation", Proc. SPIE 6727, ICONO 2007: Nonlinear Laser Spectroscopy and High-Precision Measurements; and Fundamentals of Laser Chemistry and Biophotonics, 67272F (9 July 2007); https://doi.org/10.1117/12.752487

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