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Quantum yield and lifetime data analysis for the UV curable quantum dot nanocomposites.

Qi Cheng1, Cui Liu1, Wenjun Wei1

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UV curing significantly reduces quantum yield (QY) and lifetime in quantum dot (QD) nanocomposites. This study details the dramatic changes in these photoluminescent properties after UV treatment of urethane acrylate prepolymers containing CdTe QDs.

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Area of Science:

  • Materials Science
  • Photochemistry
  • Nanotechnology

Background:

  • Quantum yield (QY) and excited-state lifetime are critical photoluminescent properties.
  • Quantum dots (QDs) are semiconductor nanoparticles with tunable optical properties.
  • Urethane acrylate prepolymers are widely used in UV-curable coatings and resins.

Purpose of the Study:

  • To investigate the impact of UV curing on the photoluminescent properties of quantum dot (QD) nanocomposites.
  • To quantify changes in quantum yield (QY) and lifetime of CdTe QDs within a urethane acrylate matrix after UV exposure.
  • To understand the influence of QD concentration on these photoluminescent property alterations.

Main Methods:

  • Preparation of CdTe QD-doped urethane acrylate nanocomposites with varying QD concentrations (0.5–10×10⁻³ mol L⁻¹).
  • UV curing of the nanocomposite samples using a photoinitiator (1% wt% 1173).
  • Measurement of quantum yield (QY) and fluorescence lifetime of QDs before and after UV curing using spectrophotometric and time-resolved fluorescence techniques.

Main Results:

  • Initial QY values for 510 nm, 540 nm, and 620 nm QDs were high (56.3–58.6%).
  • Post-UV curing, QY values drastically decreased to 8.9–13.4% for the respective QD sizes.
  • Fluorescence lifetimes decreased from approximately 23–24.5 ns to 1.3–2.7 ns after UV curing, indicating significant photobleaching or quenching.

Conclusions:

  • UV curing of urethane acrylate prepolymers severely degrades the photoluminescent performance of embedded CdTe QDs.
  • The observed reduction in QY and lifetime suggests potential photo-induced degradation pathways or interactions between QDs and the polymer matrix during curing.
  • These findings highlight challenges in integrating QDs into UV-curable systems while preserving their optical characteristics.