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<p>A fluorescence enhancement strategy was successfully demonstrated by complexing fluorescein dye with cadmium sulfide (CdS) semiconductor quantum dots (QDs). The influence of varying QD concentrations on the photophysical behavior of 1 × 10⁻<sup>4</sup>&#xa0;M fluorescein revealed that 5% w/w CdS QDs yielded the optimal balance for energy transfer efficiency and spectral modulation. Additionally, the effect of different dye concentrations within the complex was evaluated to understand concentration-dependent emission dynamics. Comprehensive photophysical characterization of the [Fluorescein: CdS QDs] system in ethanol was conducted, with particular focus on the underlying energy transfer mechanism. FRET-based analyses were employed to extract key parameters, including the critical transfer distance (<i>R</i>₀), thereby elucidating the nature and extent of QD-to-dye energy coupling. Fluorescence enhancement efficiencies were systematically studied under variable input powers using a continuous-wave blue diode laser (<i>λ</i> = 450&#xa0;nm). The QD-dye hybrid exhibited relatively high emission efficiency, along with a significantly elevated fluorescence quantum yield.</p>

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Enhancement of optical and photo-physical properties of fluorescein dye by CdS quantum dots

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月12日

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  • Mahmoud E. M. Sakr,
  • Hamed M. Kandel,
  • Maram T. H. Abou Kana,
  • Ahmed H. M. Elwahy,
  • Ahmed Abdelhady A. Khalil

摘要

A fluorescence enhancement strategy was successfully demonstrated by complexing fluorescein dye with cadmium sulfide (CdS) semiconductor quantum dots (QDs). The influence of varying QD concentrations on the photophysical behavior of 1 × 10⁻4 M fluorescein revealed that 5% w/w CdS QDs yielded the optimal balance for energy transfer efficiency and spectral modulation. Additionally, the effect of different dye concentrations within the complex was evaluated to understand concentration-dependent emission dynamics. Comprehensive photophysical characterization of the [Fluorescein: CdS QDs] system in ethanol was conducted, with particular focus on the underlying energy transfer mechanism. FRET-based analyses were employed to extract key parameters, including the critical transfer distance (R₀), thereby elucidating the nature and extent of QD-to-dye energy coupling. Fluorescence enhancement efficiencies were systematically studied under variable input powers using a continuous-wave blue diode laser (λ = 450 nm). The QD-dye hybrid exhibited relatively high emission efficiency, along with a significantly elevated fluorescence quantum yield.