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Radiation Brightening from Virus-like Particles.

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    Researchers recovered fluorescence emission from virus-bound chromophores using pulsed light. This "radiation brightening" phenomenon, observed at high chromophore densities, offers new possibilities for advanced biophotonic imaging agents.

    Keywords:
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    Area of Science:

    • Biophysics
    • Materials Science
    • Nanotechnology

    Background:

    • Concentration quenching limits fluorescence imaging applications.
    • Virus particles offer a template for organizing chromophores.
    • Controlling chromophore density is key to optical properties.

    Purpose of the Study:

    • To investigate fluorescence emission from virus-particle-confined chromophores.
    • To explore the phenomenon of concentration quenching and its suppression.
    • To assess the potential of virus-based platforms for novel imaging agents.

    Main Methods:

    • Confining hundreds of chromophores onto the surface of 28 nm virus particles.
    • Utilizing pulsed and steady-state irradiation for optical emission analysis.
    • Measuring excited-state lifetime and emission intensity at varying chromophore densities.

    Main Results:

    • Fluorescence quenching initially increased with chromophore density.
    • A sudden emission brightening and shortened excited-state lifetime were observed at maximum surface coverage under pulsed excitation.
    • Suppression of quenching was consistent with collective relaxation.
    • Brightening disappeared with increased emitter heterogeneity.

    Conclusions:

    • Virus particle structure can suppress concentration quenching, leading to enhanced optical emission.
    • Pulsed excitation is crucial for observing this radiation brightening effect.
    • Virus-enabled imaging vectors with unique optical properties can be developed.