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Precisely Tailoring Upconversion Dynamics via Energy Migration in Core-Shell Nanostructures.

Jing Zuo1,2,3, Dapeng Sun3, Langping Tu1

  • 1State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, 130033, China.

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|January 25, 2018
PubMed
Summary
This summary is machine-generated.

Excitation energy migration, not just activator interactions, governs upconversion emission dynamics in nanostructures. Researchers demonstrated control over upconversion timing by manipulating energy migration paths.

Keywords:
Monte Carlo simulationcore-shell nanostructuresenergy migrationlanthanidesluminescence dynamicsupconversion nanocrystals

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Spectroscopy

Background:

  • Upconversion emission dynamics were traditionally attributed to activator-sensitizer interactions.
  • This understanding is challenged for nanomaterials where other factors may dominate.

Purpose of the Study:

  • To investigate the role of excitation energy migration in upconversion emission dynamics of nanostructures.
  • To demonstrate control over upconversion emission timing by manipulating energy migration.

Main Methods:

  • Design of "dopant ions' spatial separation" nanostructures as model systems.
  • Theoretical modeling to understand energy migration's impact on emission dynamics.
  • Spectroscopic confirmation of theoretical predictions.

Main Results:

  • Demonstrated that excitation energy migration significantly influences upconversion emission dynamics.
  • Established a link between the randomness of energy migration and upconversion emission time behavior.
  • Achieved fine control over upconversion emission rise and decay processes by tuning energy migration paths.

Conclusions:

  • The conventional understanding of upconversion dynamics is insufficient for nanostructures.
  • Excitation energy migration is a critical factor in controlling upconversion emission.
  • This work enables new possibilities for advanced applications utilizing controlled upconversion timing.