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Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Heterogenous Core-Shell Persistent Luminescent Nanoparticles with Enhanced Afterglow Luminescence.

Chung Yin Tsang1, Jinliang Liu2, Hwa Liang Leo1

  • 1Department of Biomedical Engineering, College of Design and Engineering, National University of Singapore, Singapore 117583.

Nano Letters
|September 13, 2024
PubMed
Summary
This summary is machine-generated.

Persistent luminescent nanoparticles (PLNPs) show promise for bioapplications but suffer from surface quenching. Heterogeneous core-shell designs significantly enhance afterglow luminescence by optimizing energy transfer, overcoming limitations of traditional homogeneous structures.

Keywords:
band gapcore−shell nanostructurenanoparticlespersistent luminescenceultraviolet light

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomedical Engineering

Background:

  • Persistent luminescent nanoparticles (PLNPs) exhibit afterglow luminescence, making them suitable for bioapplications.
  • Surface quenching in PLNPs leads to reduced afterglow intensity.
  • Existing homogeneous core-shell structures offer limited improvement in luminescence.

Purpose of the Study:

  • To investigate the effect of heterogeneous core-shell structures on PLNP luminescence.
  • To enhance afterglow luminescence by minimizing shell absorption and emission.
  • To develop PLNPs with improved performance for bioimaging and sensing.

Main Methods:

  • Synthesized heterogeneous core-shell PLNPs using ZnGa2O4 and Zn2GeO4 shells on specific core materials.
  • Fabricated traditional homogeneous core-shell PLNPs for comparison.
  • Characterized the luminescent properties of both types of core-shell structures.

Main Results:

  • Heterogeneous core-shell PLNPs demonstrated significant enhancement in afterglow luminescence.
  • The higher band gap shell in heterogeneous structures improved energy transfer to the core.
  • Performance surpassed that of homogeneous core-shell PLNPs.

Conclusions:

  • Heterogeneous core-shell design is an effective strategy to overcome surface quenching in PLNPs.
  • This approach significantly boosts afterglow luminescence for enhanced bioapplication potential.
  • The findings pave the way for advanced luminescent nanomaterials.