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1991•Chemical Physics LettersOpen access

Ultrafast photochemical events associated with the photosensitization properties of a squaraine dye

Prashant V. Kamat, Suresh Das, K. George Thomas, Manapurathu V. George

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Abstract

The photosensitization properties of a squaraine dye are elucidated by means of transient absorption and emission spectroscopy techniques. The charge injection from excited dye into the conduction band of TiO2 semiconductor occurs with the laser pulse duration of 18 ps (k > 5 × 1010 s−1). The quick recombination between the dye radical cation and the injected charge (k = 3.7 × 109 s−1) is a major limiting factor in controlling the efficiency of sensitization.

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What this paper is about

The photosensitization properties of a squaraine dye are elucidated by means of transient absorption and emission spectroscopy techniques. The charge injection from excited dye into the conduction band of TiO2 semiconductor occurs with the laser pulse duration of 18 ps (k > 5 × 1010 s−1). The quick recombination between the dye radical cation and the injected charge (k = 3.7 × 109 s−1) is a major limiting factor in controlling the efficiency of sensitization.

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Available abstract

The photosensitization properties of a squaraine dye are elucidated by means of transient absorption and emission spectroscopy techniques. The charge injection from excited dye into the conduction band of TiO2 semiconductor occurs with the laser pulse duration of 18 ps (k > 5 × 1010 s−1). The quick recombination between the dye radical cation and the injected charge (k = 3.7 × 109 s−1) is a major limiting factor in controlling the efficiency of sensitization.

Key concepts: Photochemistry, Ultrafast laser spectroscopy, Excited state, Dye laser, Chemistry, Ultrashort pulse, Absorption (acoustics), Spectroscopy

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