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

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Title: Enhancement of optical and photo-physical properties of fluorescein dye by CdS quantum dots.
Authors: Sakr, Mahmoud E. M.1 (AUTHOR), Kandel, Hamed M.1 (AUTHOR), Abou Kana, Maram T. H.1 (AUTHOR) mabou202@niles.edu.eg, Elwahy, Ahmed H. M.2 (AUTHOR), Khalil, Ahmed Abdelhady A.1 (AUTHOR) a.abdelhady@niles.edu.eg
Source: Journal of Materials Science: Materials in Electronics. Jan2026, Vol. 37 Issue 3, p1-15. 15p.
Subjects: Fluorescein, Semiconductor quantum dots, Quantum efficiency, Fluorescence, Energy transfer, Fluorimetry, Fluorescence resonance energy transfer
Abstract: 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. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract: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. [ABSTRACT FROM AUTHOR]
ISSN:09574522
DOI:10.1007/s10854-025-16347-w