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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

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...
Ferromagnetism01:31

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
Colors and Magnetism03:02

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.

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Related Experiment Video

Updated: Jun 27, 2026

Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
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Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals

Published on: April 14, 2020

Er-Yb codoped ferroelectrics for controlling visible upconversion emissions.

Tung-Ching Huang1, Wen-Feng Hsieh

  • 1Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, 1001 Tahsueh Rd., Hsinchu, 30050, Taiwan.

Journal of Fluorescence
|December 6, 2008
PubMed
Summary
This summary is machine-generated.

Energy back-transfer (EBT) dominated upconversion (UC) in Er(3+) and Yb(3+) co-doped titanate powders. Crystal field symmetry influenced EBT, enhancing red UC emission by matching energy levels.

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Low-energy Cathodoluminescence for (Oxy)Nitride Phosphors
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Low-energy Cathodoluminescence for (Oxy)Nitride Phosphors
07:03

Low-energy Cathodoluminescence for (Oxy)Nitride Phosphors

Published on: November 15, 2016

Area of Science:

  • Materials Science
  • Solid State Physics
  • Luminescence

Background:

  • Upconversion (UC) emission in rare-earth doped materials is crucial for applications like bio-imaging and solar cells.
  • The interplay between energy transfer processes and crystal field symmetry significantly impacts UC efficiency.
  • Erbium (Er3+) and Ytterbium (Yb3+) co-doping is a common strategy to achieve efficient UC.

Purpose of the Study:

  • To investigate the mechanism behind the observed quenching of green and enhancement of red UC emission in Er3+/Yb3+ co-doped titanate powders (PbTiO3, BaTiO3, SrTiO3).
  • To elucidate the role of the energy back-transfer (EBT) process and its dependence on crystal field symmetry and ion concentrations.
  • To establish the correlation between crystal structure, electronic level matching, and UC emission characteristics.

Main Methods:

  • Synthesis of polycrystalline PbTiO3, BaTiO3, and SrTiO3 powders co-doped with Er3+ and Yb3+.
  • Characterization of crystal structure using X-ray diffraction (XRD).
  • Measurement of upconversion (UC) emission spectra under 980 nm laser excitation.

Main Results:

  • The observed quenching of green UC emission and enhancement of red UC emission were attributed to the energy back-transfer (EBT) process.
  • The efficiency of EBT was found to be dependent on Yb3+ concentration and the energy level alignment of Er3+ and Yb3+ ions.
  • XRD and UC spectra confirmed that a centrosymmetric crystal field, resulting from reduced tetragonality, induced a favorable level match for EBT, enhancing red UC emission.

Conclusions:

  • The energy back-transfer (EBT) process is the dominant mechanism governing the UC emission in Er3+/Yb3+ co-doped titanate ceramics.
  • Crystal field symmetry plays a critical role in tuning the EBT process by influencing the energy level alignment between Er3+ and Yb3+ ions.
  • Tailoring the crystal structure and symmetry of host materials offers a pathway to control and optimize UC emission for specific applications.