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Metal nanoparticles are proven to enhance the optical characteristics of nearby fluorophores due to their unique property called localised surface plasmon resonance (LSPR). These hybrid structures can be further utilised for a variety of applications including optoelectronics. Here, we investigate the effect of silver nanoparticles on the emission of CdxZn1-xSe/CdS quantum dots (QDs) which exhibits a large Stokes shift. An overlap between the LSPR band of Ag nanoparticle (NP) and the absorption spectra of QDs was ensured so as to facilitate fluorescence enhancement. A thin layer of poly(methyl methacrylate) (PMMA) with fixed concentration controls the separation distance between the quantum dot and metal nanoparticles, thereby preventing quenching through non-radiative energy transfer. Emission spectra and PL lifetime measurements have been carried out and analysed. A significant enhancement in emission characteristics as well as an increase in lifetime was observed for the Ag NP-QD heterostructures as compared to bare QDs, thereby confirming the efficient QD excitation in the vicinity of nanoparticles through mutual electrostatic absorption.

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Enhanced Luminescence of CdxZn1-xSe/CdS Quantum Dot–Silver Nanoparticle Heterostructures

  • 会议论文

  • 发表日期：

    2025年

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  • Palash Kusum Das,
  • Biplab Nath,
  • Barnali Mahato,
  • Asha Bhardwaj,
  • Sikha S. Menon

摘要

Metal nanoparticles are proven to enhance the optical characteristics of nearby fluorophores due to their unique property called localised surface plasmon resonance (LSPR). These hybrid structures can be further utilised for a variety of applications including optoelectronics. Here, we investigate the effect of silver nanoparticles on the emission of CdxZn1-xSe/CdS quantum dots (QDs) which exhibits a large Stokes shift. An overlap between the LSPR band of Ag nanoparticle (NP) and the absorption spectra of QDs was ensured so as to facilitate fluorescence enhancement. A thin layer of poly(methyl methacrylate) (PMMA) with fixed concentration controls the separation distance between the quantum dot and metal nanoparticles, thereby preventing quenching through non-radiative energy transfer. Emission spectra and PL lifetime measurements have been carried out and analysed. A significant enhancement in emission characteristics as well as an increase in lifetime was observed for the Ag NP-QD heterostructures as compared to bare QDs, thereby confirming the efficient QD excitation in the vicinity of nanoparticles through mutual electrostatic absorption.