Energy Transfer between Tb 3+ and Eu 3+ in LaPO 4: Pulsed versus Switched-off Continuous Wave Excitation

Yuxia Luo, Zhenyu Liu, Hon Tung Wong, Lei Zhou, Ka-Leung WONG*, Kwok Keung SHIU, Peter A. Tanner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

The energy transfer (ET) between Tb 3+ and Eu 3+ is investigated experimentally and with available theoretical models in the regime of high Tb 3+ concentrations in ≈30 nm LaPO 4 nanoparticles at room temperature. The ET efficiency approaches 100% even for lightly Eu 3+ -doped materials. The major conclusion from the use of pulsed laser excitation and switched-off continuous wave laser diode excitation is that the energy migration between Tb 3+ ions, situated on La 3+ sites with ≈4 Å separation, is not fast. The quenching of Tb 3+ emission in singly doped LaPO 4 only reduces the luminescence lifetime by ≈50% in heavily doped samples. Various theoretical models are applied to simulate the luminescence decays of Tb 3+ and Tb 3+ , Eu 3+ -doped LaPO 4 samples of various concentrations and the transfer mechanism is identified as forced electric dipole at each ion.

Original languageEnglish
Article number1900487
JournalAdvanced Science
Volume6
Issue number10
DOIs
Publication statusPublished - 17 May 2019

Scopus Subject Areas

  • Medicine (miscellaneous)
  • Chemical Engineering(all)
  • Biochemistry, Genetics and Molecular Biology (miscellaneous)
  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

User-Defined Keywords

  • energy transfer
  • lanthanide
  • migration
  • pulse and continuous wave excitation

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