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<p>Fluorescein (C<sub>20</sub>H<sub>12</sub>O<sub>5</sub>) is a synthetic dye known for its excellent optical and fluorescence properties; it is used as a gain medium in lasers. While fluorescein has garnered interest for use in dye-sensitized solar cells, its narrow absorption spectrum in the visible range limits its effectiveness. To enhance the energy conversion, broader absorption spectra of the materials are desirable. Also, understanding how an organic dye performs under harsh environmental conditions is essential for enhancing its performance. We demonstrate that the absorption spectrum of fluorescein dye can be broadened and its optical properties enhanced by using an acoustic shock wave generated with a semi-automated Reddy tube, operating at Mach number of 1.5, a transient pressure of 590&#xa0;kPa, and a transient temperature of 520&#xa0;K. To assess structural and optical properties of fluorescein&#xa0;before and after shock waves, we used powder XRD, Raman spectroscopy, UV-DRS, fluorescence spectroscopy, and FESEM. The crystalline structure and average crystallite size were determined from the XRD pattern; after shock loading, no structural changes were found. The absorption spectra showed a significantly enhanced absorption range in the visible region without altering the structure.</p>

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Enhancing the optical absorption range of fluorescein via acoustic shock pulses for improved energy conversion applications

  • 期刊论文

  • 发表日期：

    2025年7月3日

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  • M. Sandhiya,
  • F. Irine Maria Bincy,
  • S. Oviya,
  • V. Collins Arun Prakash,
  • Raju Suresh Kumar,
  • Ikhyum Kim,
  • S. A. Martin Britto Dhas

摘要

Fluorescein (C20H12O5) is a synthetic dye known for its excellent optical and fluorescence properties; it is used as a gain medium in lasers. While fluorescein has garnered interest for use in dye-sensitized solar cells, its narrow absorption spectrum in the visible range limits its effectiveness. To enhance the energy conversion, broader absorption spectra of the materials are desirable. Also, understanding how an organic dye performs under harsh environmental conditions is essential for enhancing its performance. We demonstrate that the absorption spectrum of fluorescein dye can be broadened and its optical properties enhanced by using an acoustic shock wave generated with a semi-automated Reddy tube, operating at Mach number of 1.5, a transient pressure of 590 kPa, and a transient temperature of 520 K. To assess structural and optical properties of fluorescein before and after shock waves, we used powder XRD, Raman spectroscopy, UV-DRS, fluorescence spectroscopy, and FESEM. The crystalline structure and average crystallite size were determined from the XRD pattern; after shock loading, no structural changes were found. The absorption spectra showed a significantly enhanced absorption range in the visible region without altering the structure.