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Novel Aspects about "Lifetime" in Upconversion Luminescence.

Yingdong Han1,2, Xingxing Zhang1, Ling Huang3

  • 1College of Science, Civil Aviation University of China, Tianjin, 300300, China.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|September 12, 2023
PubMed
Summary

Lanthanide-doped upconversion luminescence (UCL) temporal response (TR) is a collective phenomenon, not an individual ion property. Understanding this collective TR is key for advanced UCL applications.

Keywords:
lanthanide ionslifetimenanotechnologyrare earth elementsupconversion luminescence

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Spectroscopy

Background:

  • Recent advancements in lanthanide-doped upconversion luminescence (UCL) have highlighted the importance of temporal response (TR).
  • Novel experimental findings necessitate a re-evaluation of UCL dynamics, particularly the lifetime of sensitizer/activator ions.
  • Existing understanding of UCL mechanisms requires refinement to incorporate collective ion behavior.

Purpose of the Study:

  • To re-examine the temporal response (TR) dynamics in lanthanide-doped upconversion luminescence (UCL) systems.
  • To elucidate the relationship between excitation and emission processes in UCL.
  • To discuss current challenges and future directions in regulating UCL's TR features.

Main Methods:

  • Conceptual review of recent experimental phenomena and luminescence mechanisms in UCL.
  • Analysis of the collective temporal response (TR) of involved ions, particularly at the decay edge.
  • Discussion of excitation-emission dynamics and TR regulation strategies.

Main Results:

  • UCL lifetime should be viewed as the collective TR of all involved ions, not an individual ion's radiative rate.
  • Understanding the collective TR is crucial for advanced UCL applications like biological diagnosis and optical coding.
  • Novel insights into UCL dynamics are emerging from recent experimental observations.

Conclusions:

  • A deeper understanding of UCL's collective temporal response is essential.
  • Further regulation of TR features can unlock advanced applications in optics and diagnostics.
  • This conceptual review provides fundamental insights for future research in UCL dynamics.