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Abstract <p>This work demonstrated for the first time that aqueous solutions of nonaromatic amino acids such as <i>L</i>-arginine hydrochloride, <i>L</i>-lysine hydrochloride, and glycine can simultaneously emit fluorescence and afterglow when excited by UV-visible light at room temperature. The afterglow of luminescence differs from ordinary fluorescence by its low intensity and long duration. The simultaneous occurrence of short-term and long-lived fluorescence in nonconventional luminophores is indicative of the dual nature of fluorescence and the existence of excited states of different nature. The revealed correlation in the form of short-term and long-lived fluorescence spectra suggests that the afterglow of luminescence corresponds to thermally activated delayed fluorescence, which occurs through the mechanism of reconversion from the lowest triplet state <i>T</i><sub>1</sub> to the lowest singlet state <i>S</i><sub>1</sub>. Further research should help shed light on understanding the biophysics of photoinduced processes in biological systems.</p>

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Room Temperature Photoluminescence in Nonaromatic Amino Acid Solution

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • E. L. Terpugov,
  • S. N. Udaltsov,
  • O. V. Degtyareva

摘要

Abstract

This work demonstrated for the first time that aqueous solutions of nonaromatic amino acids such as L-arginine hydrochloride, L-lysine hydrochloride, and glycine can simultaneously emit fluorescence and afterglow when excited by UV-visible light at room temperature. The afterglow of luminescence differs from ordinary fluorescence by its low intensity and long duration. The simultaneous occurrence of short-term and long-lived fluorescence in nonconventional luminophores is indicative of the dual nature of fluorescence and the existence of excited states of different nature. The revealed correlation in the form of short-term and long-lived fluorescence spectra suggests that the afterglow of luminescence corresponds to thermally activated delayed fluorescence, which occurs through the mechanism of reconversion from the lowest triplet state T1 to the lowest singlet state S1. Further research should help shed light on understanding the biophysics of photoinduced processes in biological systems.